| 1 | !> @file land_surface_model.f90 |
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| 2 | !--------------------------------------------------------------------------------! |
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| 3 | ! This file is part of PALM. |
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| 4 | ! |
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| 5 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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| 6 | ! of the GNU General Public License as published by the Free Software Foundation, |
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| 7 | ! either version 3 of the License, or (at your option) any later version. |
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| 8 | ! |
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| 9 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 10 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 11 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 12 | ! |
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| 13 | ! You should have received a copy of the GNU General Public License along with |
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| 14 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 15 | ! |
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| 16 | ! Copyright 1997-2015 Leibniz Universitaet Hannover |
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| 17 | !--------------------------------------------------------------------------------! |
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| 18 | ! |
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| 19 | ! Current revisions: |
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| 20 | ! ----------------- |
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| 21 | ! Replaced rif with ol |
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| 22 | ! |
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| 23 | ! Former revisions: |
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| 24 | ! ----------------- |
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| 25 | ! $Id: land_surface_model.f90 1695 2015-10-27 10:03:11Z maronga $ |
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| 26 | ! Bugfix: REAL constants provided with KIND-attribute in call of |
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| 27 | ! 1691 2015-10-26 16:17:44Z maronga |
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| 28 | ! Added skip_time_do_lsm to allow for spin-ups without LSM. Various bugfixes: |
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| 29 | ! Soil temperatures are now defined at the edges of the layers, calculation of |
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| 30 | ! shb_eb corrected, prognostic equation for skin temperature corrected. Surface |
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| 31 | ! fluxes are now directly transfered to atmosphere |
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| 32 | ! |
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| 33 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 34 | ! Code annotations made doxygen readable |
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| 35 | ! |
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| 36 | ! 1590 2015-05-08 13:56:27Z maronga |
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| 37 | ! Bugfix: definition of character strings requires same length for all elements |
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| 38 | ! |
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| 39 | ! 1585 2015-04-30 07:05:52Z maronga |
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| 40 | ! Modifications for RRTMG. Changed tables to PARAMETER type. |
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| 41 | ! |
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| 42 | ! 1571 2015-03-12 16:12:49Z maronga |
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| 43 | ! Removed upper-case variable names. Corrected distribution of precipitation to |
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| 44 | ! the liquid water reservoir and the bare soil fractions. |
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| 45 | ! |
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| 46 | ! 1555 2015-03-04 17:44:27Z maronga |
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| 47 | ! Added output of r_a and r_s |
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| 48 | ! |
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| 49 | ! 1553 2015-03-03 17:33:54Z maronga |
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| 50 | ! Improved better treatment of roughness lengths. Added default soil temperature |
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| 51 | ! profile |
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| 52 | ! |
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| 53 | ! 1551 2015-03-03 14:18:16Z maronga |
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| 54 | ! Flux calculation is now done in prandtl_fluxes. Added support for data output. |
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| 55 | ! Vertical indices have been replaced. Restart runs are now possible. Some |
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| 56 | ! variables have beem renamed. Bugfix in the prognostic equation for the surface |
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| 57 | ! temperature. Introduced z0_eb and z0h_eb, which overwrite the setting of |
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| 58 | ! roughness_length and z0_factor. Added Clapp & Hornberger parametrization for |
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| 59 | ! the hydraulic conductivity. Bugfix for root fraction and extraction |
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| 60 | ! calculation |
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| 61 | ! |
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| 62 | ! intrinsic function MAX and MIN |
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| 63 | ! |
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| 64 | ! 1500 2014-12-03 17:42:41Z maronga |
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| 65 | ! Corrected calculation of aerodynamic resistance (r_a). |
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| 66 | ! Precipitation is now added to liquid water reservoir using LE_liq. |
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| 67 | ! Added support for dry runs. |
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| 68 | ! |
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| 69 | ! 1496 2014-12-02 17:25:50Z maronga |
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| 70 | ! Initial revision |
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| 71 | ! |
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| 72 | ! |
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| 73 | ! Description: |
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| 74 | ! ------------ |
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| 75 | !> Land surface model, consisting of a solver for the energy balance at the |
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| 76 | !> surface and a four layer soil scheme. The scheme is similar to the TESSEL |
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| 77 | !> scheme implemented in the ECMWF IFS model, with modifications according to |
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| 78 | !> H-TESSEL. The implementation is based on the formulation implemented in the |
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| 79 | !> DALES and UCLA-LES models. |
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| 80 | !> |
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| 81 | !> @todo Consider partial absorption of the net shortwave radiation by the |
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| 82 | !> surface layer. |
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| 83 | !> @todo Allow for water surfaces |
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| 84 | !> @todo Invert indices (running from -3 to 0. Currently: nzb_soil=0, |
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| 85 | !> nzt_soil=3)). |
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| 86 | !> @todo Implement surface runoff model (required when performing long-term LES |
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| 87 | !> with considerable precipitation. |
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| 88 | !> |
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| 89 | !> @note No time step criterion is required as long as the soil layers do not |
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| 90 | !> become too thin. |
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| 91 | !------------------------------------------------------------------------------! |
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| 92 | MODULE land_surface_model_mod |
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| 93 | |
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| 94 | USE arrays_3d, & |
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| 95 | ONLY: hyp, ol, pt, pt_p, q, q_p, ql, qsws, shf, ts, us, vpt, z0, z0h |
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| 96 | |
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| 97 | USE cloud_parameters, & |
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| 98 | ONLY: cp, hyrho, l_d_cp, l_d_r, l_v, prr, pt_d_t, rho_l, r_d, r_v |
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| 99 | |
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| 100 | USE control_parameters, & |
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| 101 | ONLY: cloud_physics, dt_3d, humidity, intermediate_timestep_count, & |
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| 102 | initializing_actions, intermediate_timestep_count_max, & |
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| 103 | max_masks, precipitation, pt_surface, rho_surface, & |
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| 104 | roughness_length, surface_pressure, timestep_scheme, tsc, & |
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| 105 | z0h_factor, time_since_reference_point |
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| 106 | |
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| 107 | USE indices, & |
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| 108 | ONLY: nbgp, nxlg, nxrg, nyng, nysg, nzb, nzb_s_inner |
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| 109 | |
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| 110 | USE kinds |
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| 111 | |
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| 112 | USE netcdf_control, & |
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| 113 | ONLY: dots_label, dots_num, dots_unit |
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| 114 | |
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| 115 | USE pegrid |
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| 116 | |
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| 117 | USE radiation_model_mod, & |
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| 118 | ONLY: force_radiation_call, radiation_scheme, rad_net, rad_sw_in, & |
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| 119 | rad_lw_out, sigma_sb |
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| 120 | |
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| 121 | #if defined ( __rrtmg ) |
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| 122 | USE radiation_model_mod, & |
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| 123 | ONLY: rrtm_lwuflx_dt, rrtm_idrv |
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| 124 | #endif |
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| 125 | |
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| 126 | USE statistics, & |
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| 127 | ONLY: hom, statistic_regions |
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| 128 | |
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| 129 | IMPLICIT NONE |
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| 130 | |
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| 131 | ! |
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| 132 | !-- LSM model constants |
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| 133 | INTEGER(iwp), PARAMETER :: nzb_soil = 0, & !< bottom of the soil model (to be switched) |
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| 134 | nzt_soil = 3, & !< top of the soil model (to be switched) |
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| 135 | nzs = 4 !< number of soil layers (fixed for now) |
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| 136 | |
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| 137 | INTEGER(iwp) :: dots_soil = 0 !< starting index for timeseries output |
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| 138 | |
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| 139 | INTEGER(iwp), DIMENSION(0:1) :: id_dim_zs_xy, id_dim_zs_xz, id_dim_zs_yz, & |
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| 140 | id_dim_zs_3d, id_var_zs_xy, & |
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| 141 | id_var_zs_xz, id_var_zs_yz, id_var_zs_3d |
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| 142 | |
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| 143 | INTEGER(iwp), DIMENSION(1:max_masks,0:1) :: id_dim_zs_mask, id_var_zs_mask |
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| 144 | |
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| 145 | REAL(wp), PARAMETER :: & |
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| 146 | b_ch = 6.04_wp, & ! Clapp & Hornberger exponent |
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| 147 | lambda_h_dry = 0.19_wp, & ! heat conductivity for dry soil |
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| 148 | lambda_h_sm = 3.44_wp, & ! heat conductivity of the soil matrix |
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| 149 | lambda_h_water = 0.57_wp, & ! heat conductivity of water |
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| 150 | psi_sat = -0.388_wp, & ! soil matrix potential at saturation |
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| 151 | rho_c_soil = 2.19E6_wp, & ! volumetric heat capacity of soil |
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| 152 | rho_c_water = 4.20E6_wp, & ! volumetric heat capacity of water |
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| 153 | m_max_depth = 0.0002_wp ! Maximum capacity of the water reservoir (m) |
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| 154 | |
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| 155 | |
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| 156 | ! |
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| 157 | !-- LSM variables |
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| 158 | INTEGER(iwp) :: veg_type = 2, & !< vegetation type, 0: user-defined, 1-19: generic (see list) |
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| 159 | soil_type = 3 !< soil type, 0: user-defined, 1-6: generic (see list) |
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| 160 | |
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| 161 | LOGICAL :: conserve_water_content = .TRUE., & !< open or closed bottom surface for the soil model |
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| 162 | dewfall = .TRUE., & !< allow/inhibit dewfall |
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| 163 | force_radiation_call_l = .FALSE., & !< flag parameter for unscheduled radiation model calls |
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| 164 | land_surface = .FALSE. !< flag parameter indicating wheather the lsm is used |
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| 165 | |
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| 166 | ! value 9999999.9_wp -> generic available or user-defined value must be set |
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| 167 | ! otherwise -> no generic variable and user setting is optional |
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| 168 | REAL(wp) :: alpha_vangenuchten = 9999999.9_wp, & !< NAMELIST alpha_vg |
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| 169 | canopy_resistance_coefficient = 9999999.9_wp, & !< NAMELIST g_d |
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| 170 | c_surface = 20000.0_wp, & !< Surface (skin) heat capacity |
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| 171 | drho_l_lv, & !< (rho_l * l_v)**-1 |
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| 172 | exn, & !< value of the Exner function |
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| 173 | e_s = 0.0_wp, & !< saturation water vapour pressure |
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| 174 | field_capacity = 9999999.9_wp, & !< NAMELIST m_fc |
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| 175 | f_shortwave_incoming = 9999999.9_wp, & !< NAMELIST f_sw_in |
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| 176 | hydraulic_conductivity = 9999999.9_wp, & !< NAMELIST gamma_w_sat |
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| 177 | ke = 0.0_wp, & !< Kersten number |
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| 178 | lambda_h_sat = 0.0_wp, & !< heat conductivity for saturated soil |
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| 179 | lambda_surface_stable = 9999999.9_wp, & !< NAMELIST lambda_surface_s |
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| 180 | lambda_surface_unstable = 9999999.9_wp, & !< NAMELIST lambda_surface_u |
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| 181 | leaf_area_index = 9999999.9_wp, & !< NAMELIST lai |
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| 182 | l_vangenuchten = 9999999.9_wp, & !< NAMELIST l_vg |
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| 183 | min_canopy_resistance = 9999999.9_wp, & !< NAMELIST r_canopy_min |
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| 184 | min_soil_resistance = 50.0_wp, & !< NAMELIST r_soil_min |
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| 185 | m_total = 0.0_wp, & !< weighted total water content of the soil (m3/m3) |
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| 186 | n_vangenuchten = 9999999.9_wp, & !< NAMELIST n_vg |
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| 187 | q_s = 0.0_wp, & !< saturation specific humidity |
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| 188 | residual_moisture = 9999999.9_wp, & !< NAMELIST m_res |
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| 189 | rho_cp, & !< rho_surface * cp |
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| 190 | rho_lv, & !< rho * l_v |
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| 191 | rd_d_rv, & !< r_d / r_v |
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| 192 | saturation_moisture = 9999999.9_wp, & !< NAMELIST m_sat |
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| 193 | skip_time_do_lsm = 0.0_wp, & !< LSM is not called before this time |
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| 194 | vegetation_coverage = 9999999.9_wp, & !< NAMELIST c_veg |
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| 195 | wilting_point = 9999999.9_wp, & !< NAMELIST m_wilt |
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| 196 | z0_eb = 9999999.9_wp, & !< NAMELIST z0 (lsm_par) |
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| 197 | z0h_eb = 9999999.9_wp !< NAMELIST z0h (lsm_par) |
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| 198 | |
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| 199 | REAL(wp), DIMENSION(nzb_soil:nzt_soil) :: & |
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| 200 | ddz_soil_stag, & !< 1/dz_soil_stag |
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| 201 | dz_soil_stag, & !< soil grid spacing (center-center) |
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| 202 | root_extr = 0.0_wp, & !< root extraction |
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| 203 | root_fraction = (/9999999.9_wp, 9999999.9_wp, & |
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| 204 | 9999999.9_wp, 9999999.9_wp /), & !< distribution of root surface area to the individual soil layers |
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| 205 | zs = (/0.07_wp, 0.28_wp, 1.00_wp, 2.89_wp/), & !< soil layer depths (m) |
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| 206 | soil_moisture = 0.0_wp !< soil moisture content (m3/m3) |
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| 207 | |
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| 208 | REAL(wp), DIMENSION(nzb_soil:nzt_soil+1) :: & |
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| 209 | soil_temperature = (/290.0_wp, 287.0_wp, 285.0_wp, 283.0_wp, & !< soil temperature (K) |
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| 210 | 283.0_wp /), & |
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| 211 | ddz_soil, & !< 1/dz_soil |
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| 212 | dz_soil !< soil grid spacing (edge-edge) |
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| 213 | |
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| 214 | #if defined( __nopointer ) |
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| 215 | REAL(wp), DIMENSION(:,:), ALLOCATABLE, TARGET :: t_surface, & !< surface temperature (K) |
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| 216 | t_surface_p, & !< progn. surface temperature (K) |
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| 217 | m_liq_eb, & !< liquid water reservoir (m) |
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| 218 | m_liq_eb_av, & !< liquid water reservoir (m) |
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| 219 | m_liq_eb_p !< progn. liquid water reservoir (m) |
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| 220 | #else |
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| 221 | REAL(wp), DIMENSION(:,:), POINTER :: t_surface, & |
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| 222 | t_surface_p, & |
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| 223 | m_liq_eb, & |
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| 224 | m_liq_eb_p |
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| 225 | |
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| 226 | REAL(wp), DIMENSION(:,:), ALLOCATABLE, TARGET :: t_surface_1, t_surface_2, & |
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| 227 | m_liq_eb_av, & |
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| 228 | m_liq_eb_1, m_liq_eb_2 |
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| 229 | #endif |
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| 230 | |
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| 231 | ! |
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| 232 | !-- Temporal tendencies for time stepping |
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| 233 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: tt_surface_m, & !< surface temperature tendency (K) |
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| 234 | tm_liq_eb_m !< liquid water reservoir tendency (m) |
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| 235 | |
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| 236 | ! |
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| 237 | !-- Energy balance variables |
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| 238 | REAL(wp), DIMENSION(:,:), ALLOCATABLE :: & |
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| 239 | alpha_vg, & !< coef. of Van Genuchten |
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| 240 | c_liq, & !< liquid water coverage (of vegetated area) |
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| 241 | c_liq_av, & !< average of c_liq |
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| 242 | c_soil_av, & !< average of c_soil |
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| 243 | c_veg, & !< vegetation coverage |
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| 244 | c_veg_av, & !< average of c_veg |
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| 245 | f_sw_in, & !< fraction of absorbed shortwave radiation by the surface layer (not implemented yet) |
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| 246 | ghf_eb, & !< ground heat flux |
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| 247 | ghf_eb_av, & !< average of ghf_eb |
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| 248 | gamma_w_sat, & !< hydraulic conductivity at saturation |
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| 249 | g_d, & !< coefficient for dependence of r_canopy on water vapour pressure deficit |
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| 250 | lai, & !< leaf area index |
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| 251 | lai_av, & !< average of lai |
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| 252 | lambda_surface_s, & !< coupling between surface and soil (depends on vegetation type) |
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| 253 | lambda_surface_u, & !< coupling between surface and soil (depends on vegetation type) |
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| 254 | l_vg, & !< coef. of Van Genuchten |
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| 255 | m_fc, & !< soil moisture at field capacity (m3/m3) |
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| 256 | m_res, & !< residual soil moisture |
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| 257 | m_sat, & !< saturation soil moisture (m3/m3) |
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| 258 | m_wilt, & !< soil moisture at permanent wilting point (m3/m3) |
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| 259 | n_vg, & !< coef. Van Genuchten |
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| 260 | qsws_eb, & !< surface flux of latent heat (total) |
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| 261 | qsws_eb_av, & !< average of qsws_eb |
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| 262 | qsws_liq_eb, & !< surface flux of latent heat (liquid water portion) |
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| 263 | qsws_liq_eb_av, & !< average of qsws_liq_eb |
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| 264 | qsws_soil_eb, & !< surface flux of latent heat (soil portion) |
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| 265 | qsws_soil_eb_av, & !< average of qsws_soil_eb |
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| 266 | qsws_veg_eb, & !< surface flux of latent heat (vegetation portion) |
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| 267 | qsws_veg_eb_av, & !< average of qsws_veg_eb |
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| 268 | rad_net_l, & !< local copy of rad_net (net radiation at surface) |
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| 269 | r_a, & !< aerodynamic resistance |
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| 270 | r_a_av, & !< avergae of r_a |
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| 271 | r_canopy, & !< canopy resistance |
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| 272 | r_soil, & !< soil resistance |
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| 273 | r_soil_min, & !< minimum soil resistance |
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| 274 | r_s, & !< total surface resistance (combination of r_soil and r_canopy) |
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| 275 | r_s_av, & !< average of r_s |
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| 276 | r_canopy_min, & !< minimum canopy (stomatal) resistance |
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| 277 | shf_eb, & !< surface flux of sensible heat |
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| 278 | shf_eb_av !< average of shf_eb |
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| 279 | |
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| 280 | |
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| 281 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: & |
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| 282 | lambda_h, & !< heat conductivity of soil (?) |
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| 283 | lambda_w, & !< hydraulic diffusivity of soil (?) |
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| 284 | gamma_w, & !< hydraulic conductivity of soil (?) |
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| 285 | rho_c_total !< volumetric heat capacity of the actual soil matrix (?) |
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| 286 | |
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| 287 | #if defined( __nopointer ) |
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| 288 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET :: & |
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| 289 | t_soil, & !< Soil temperature (K) |
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| 290 | t_soil_av, & !< Average of t_soil |
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| 291 | t_soil_p, & !< Prog. soil temperature (K) |
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| 292 | m_soil, & !< Soil moisture (m3/m3) |
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| 293 | m_soil_av, & !< Average of m_soil |
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| 294 | m_soil_p !< Prog. soil moisture (m3/m3) |
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| 295 | #else |
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| 296 | REAL(wp), DIMENSION(:,:,:), POINTER :: & |
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| 297 | t_soil, t_soil_p, & |
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| 298 | m_soil, m_soil_p |
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| 299 | |
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| 300 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE, TARGET :: & |
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| 301 | t_soil_av, t_soil_1, t_soil_2, & |
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| 302 | m_soil_av, m_soil_1, m_soil_2 |
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| 303 | #endif |
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| 304 | |
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| 305 | |
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| 306 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: & |
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| 307 | tt_soil_m, & !< t_soil storage array |
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| 308 | tm_soil_m, & !< m_soil storage array |
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| 309 | root_fr !< root fraction (sum=1) |
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| 310 | |
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| 311 | |
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| 312 | ! |
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| 313 | !-- Predefined Land surface classes (veg_type) |
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| 314 | CHARACTER(26), DIMENSION(0:19), PARAMETER :: veg_type_name = (/ & |
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| 315 | 'user defined ', & ! 0 |
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| 316 | 'crops, mixed farming ', & ! 1 |
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| 317 | 'short grass ', & ! 2 |
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| 318 | 'evergreen needleleaf trees', & ! 3 |
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| 319 | 'deciduous needleleaf trees', & ! 4 |
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| 320 | 'evergreen broadleaf trees ', & ! 5 |
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| 321 | 'deciduous broadleaf trees ', & ! 6 |
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| 322 | 'tall grass ', & ! 7 |
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| 323 | 'desert ', & ! 8 |
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| 324 | 'tundra ', & ! 9 |
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| 325 | 'irrigated crops ', & ! 10 |
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| 326 | 'semidesert ', & ! 11 |
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| 327 | 'ice caps and glaciers ', & ! 12 |
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| 328 | 'bogs and marshes ', & ! 13 |
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| 329 | 'inland water ', & ! 14 |
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| 330 | 'ocean ', & ! 15 |
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| 331 | 'evergreen shrubs ', & ! 16 |
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| 332 | 'deciduous shrubs ', & ! 17 |
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| 333 | 'mixed forest/woodland ', & ! 18 |
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| 334 | 'interrupted forest ' & ! 19 |
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| 335 | /) |
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| 336 | |
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| 337 | ! |
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| 338 | !-- Soil model classes (soil_type) |
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| 339 | CHARACTER(12), DIMENSION(0:7), PARAMETER :: soil_type_name = (/ & |
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| 340 | 'user defined', & ! 0 |
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| 341 | 'coarse ', & ! 1 |
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| 342 | 'medium ', & ! 2 |
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| 343 | 'medium-fine ', & ! 3 |
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| 344 | 'fine ', & ! 4 |
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| 345 | 'very fine ', & ! 5 |
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| 346 | 'organic ', & ! 6 |
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| 347 | 'loamy (CH) ' & ! 7 |
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| 348 | /) |
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| 349 | ! |
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| 350 | !-- Land surface parameters according to the respective classes (veg_type) |
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| 351 | |
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| 352 | ! |
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| 353 | !-- Land surface parameters I |
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| 354 | !-- r_canopy_min, lai, c_veg, g_d |
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| 355 | REAL(wp), DIMENSION(0:3,1:19), PARAMETER :: veg_pars = RESHAPE( (/ & |
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| 356 | 180.0_wp, 3.00_wp, 0.90_wp, 0.00_wp, & ! 1 |
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| 357 | 110.0_wp, 2.00_wp, 0.85_wp, 0.00_wp, & ! 2 |
|---|
| 358 | 500.0_wp, 5.00_wp, 0.90_wp, 0.03_wp, & ! 3 |
|---|
| 359 | 500.0_wp, 5.00_wp, 0.90_wp, 0.03_wp, & ! 4 |
|---|
| 360 | 175.0_wp, 5.00_wp, 0.90_wp, 0.03_wp, & ! 5 |
|---|
| 361 | 240.0_wp, 6.00_wp, 0.99_wp, 0.13_wp, & ! 6 |
|---|
| 362 | 100.0_wp, 2.00_wp, 0.70_wp, 0.00_wp, & ! 7 |
|---|
| 363 | 250.0_wp, 0.05_wp, 0.00_wp, 0.00_wp, & ! 8 |
|---|
| 364 | 80.0_wp, 1.00_wp, 0.50_wp, 0.00_wp, & ! 9 |
|---|
| 365 | 180.0_wp, 3.00_wp, 0.90_wp, 0.00_wp, & ! 10 |
|---|
| 366 | 150.0_wp, 0.50_wp, 0.10_wp, 0.00_wp, & ! 11 |
|---|
| 367 | 0.0_wp, 0.00_wp, 0.00_wp, 0.00_wp, & ! 12 |
|---|
| 368 | 240.0_wp, 4.00_wp, 0.60_wp, 0.00_wp, & ! 13 |
|---|
| 369 | 0.0_wp, 0.00_wp, 0.00_wp, 0.00_wp, & ! 14 |
|---|
| 370 | 0.0_wp, 0.00_wp, 0.00_wp, 0.00_wp, & ! 15 |
|---|
| 371 | 225.0_wp, 3.00_wp, 0.50_wp, 0.00_wp, & ! 16 |
|---|
| 372 | 225.0_wp, 1.50_wp, 0.50_wp, 0.00_wp, & ! 17 |
|---|
| 373 | 250.0_wp, 5.00_wp, 0.90_wp, 0.03_wp, & ! 18 |
|---|
| 374 | 175.0_wp, 2.50_wp, 0.90_wp, 0.03_wp & ! 19 |
|---|
| 375 | /), (/ 4, 19 /) ) |
|---|
| 376 | |
|---|
| 377 | ! |
|---|
| 378 | !-- Land surface parameters II z0, z0h |
|---|
| 379 | REAL(wp), DIMENSION(0:1,1:19), PARAMETER :: roughness_par = RESHAPE( (/ & |
|---|
| 380 | 0.25_wp, 0.25E-2_wp, & ! 1 |
|---|
| 381 | 0.20_wp, 0.20E-2_wp, & ! 2 |
|---|
| 382 | 2.00_wp, 2.00_wp, & ! 3 |
|---|
| 383 | 2.00_wp, 2.00_wp, & ! 4 |
|---|
| 384 | 2.00_wp, 2.00_wp, & ! 5 |
|---|
| 385 | 2.00_wp, 2.00_wp, & ! 6 |
|---|
| 386 | 0.47_wp, 0.47E-2_wp, & ! 7 |
|---|
| 387 | 0.013_wp, 0.013E-2_wp, & ! 8 |
|---|
| 388 | 0.034_wp, 0.034E-2_wp, & ! 9 |
|---|
| 389 | 0.5_wp, 0.50E-2_wp, & ! 10 |
|---|
| 390 | 0.17_wp, 0.17E-2_wp, & ! 11 |
|---|
| 391 | 1.3E-3_wp, 1.3E-4_wp, & ! 12 |
|---|
| 392 | 0.83_wp, 0.83E-2_wp, & ! 13 |
|---|
| 393 | 0.00_wp, 0.00E-2_wp, & ! 14 |
|---|
| 394 | 0.00_wp, 0.00E-2_wp, & ! 15 |
|---|
| 395 | 0.10_wp, 0.10E-2_wp, & ! 16 |
|---|
| 396 | 0.25_wp, 0.25E-2_wp, & ! 17 |
|---|
| 397 | 2.00_wp, 2.00E-2_wp, & ! 18 |
|---|
| 398 | 1.10_wp, 1.10E-2_wp & ! 19 |
|---|
| 399 | /), (/ 2, 19 /) ) |
|---|
| 400 | |
|---|
| 401 | ! |
|---|
| 402 | !-- Land surface parameters III lambda_surface_s, lambda_surface_u, f_sw_in |
|---|
| 403 | REAL(wp), DIMENSION(0:2,1:19), PARAMETER :: surface_pars = RESHAPE( (/ & |
|---|
| 404 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 1 |
|---|
| 405 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 2 |
|---|
| 406 | 20.0_wp, 15.0_wp, 0.03_wp, & ! 3 |
|---|
| 407 | 20.0_wp, 15.0_wp, 0.03_wp, & ! 4 |
|---|
| 408 | 20.0_wp, 15.0_wp, 0.03_wp, & ! 5 |
|---|
| 409 | 20.0_wp, 15.0_wp, 0.03_wp, & ! 6 |
|---|
| 410 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 7 |
|---|
| 411 | 15.0_wp, 15.0_wp, 0.00_wp, & ! 8 |
|---|
| 412 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 9 |
|---|
| 413 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 10 |
|---|
| 414 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 11 |
|---|
| 415 | 58.0_wp, 58.0_wp, 0.00_wp, & ! 12 |
|---|
| 416 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 13 |
|---|
| 417 | 1.0E20_wp, 1.0E20_wp, 0.00_wp, & ! 14 |
|---|
| 418 | 1.0E20_wp, 1.0E20_wp, 0.00_wp, & ! 15 |
|---|
| 419 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 16 |
|---|
| 420 | 10.0_wp, 10.0_wp, 0.05_wp, & ! 17 |
|---|
| 421 | 20.0_wp, 15.0_wp, 0.03_wp, & ! 18 |
|---|
| 422 | 20.0_wp, 15.0_wp, 0.03_wp & ! 19 |
|---|
| 423 | /), (/ 3, 19 /) ) |
|---|
| 424 | |
|---|
| 425 | ! |
|---|
| 426 | !-- Root distribution (sum = 1) level 1, level 2, level 3, level 4, |
|---|
| 427 | REAL(wp), DIMENSION(0:3,1:19), PARAMETER :: root_distribution = RESHAPE( (/ & |
|---|
| 428 | 0.24_wp, 0.41_wp, 0.31_wp, 0.04_wp, & ! 1 |
|---|
| 429 | 0.35_wp, 0.38_wp, 0.23_wp, 0.04_wp, & ! 2 |
|---|
| 430 | 0.26_wp, 0.39_wp, 0.29_wp, 0.06_wp, & ! 3 |
|---|
| 431 | 0.26_wp, 0.38_wp, 0.29_wp, 0.07_wp, & ! 4 |
|---|
| 432 | 0.24_wp, 0.38_wp, 0.31_wp, 0.07_wp, & ! 5 |
|---|
| 433 | 0.25_wp, 0.34_wp, 0.27_wp, 0.14_wp, & ! 6 |
|---|
| 434 | 0.27_wp, 0.27_wp, 0.27_wp, 0.09_wp, & ! 7 |
|---|
| 435 | 1.00_wp, 0.00_wp, 0.00_wp, 0.00_wp, & ! 8 |
|---|
| 436 | 0.47_wp, 0.45_wp, 0.08_wp, 0.00_wp, & ! 9 |
|---|
| 437 | 0.24_wp, 0.41_wp, 0.31_wp, 0.04_wp, & ! 10 |
|---|
| 438 | 0.17_wp, 0.31_wp, 0.33_wp, 0.19_wp, & ! 11 |
|---|
| 439 | 0.00_wp, 0.00_wp, 0.00_wp, 0.00_wp, & ! 12 |
|---|
| 440 | 0.25_wp, 0.34_wp, 0.27_wp, 0.11_wp, & ! 13 |
|---|
| 441 | 0.00_wp, 0.00_wp, 0.00_wp, 0.00_wp, & ! 14 |
|---|
| 442 | 0.00_wp, 0.00_wp, 0.00_wp, 0.00_wp, & ! 15 |
|---|
| 443 | 0.23_wp, 0.36_wp, 0.30_wp, 0.11_wp, & ! 16 |
|---|
| 444 | 0.23_wp, 0.36_wp, 0.30_wp, 0.11_wp, & ! 17 |
|---|
| 445 | 0.19_wp, 0.35_wp, 0.36_wp, 0.10_wp, & ! 18 |
|---|
| 446 | 0.19_wp, 0.35_wp, 0.36_wp, 0.10_wp & ! 19 |
|---|
| 447 | /), (/ 4, 19 /) ) |
|---|
| 448 | |
|---|
| 449 | ! |
|---|
| 450 | !-- Soil parameters according to the following porosity classes (soil_type) |
|---|
| 451 | |
|---|
| 452 | ! |
|---|
| 453 | !-- Soil parameters I alpha_vg, l_vg, n_vg, gamma_w_sat |
|---|
| 454 | REAL(wp), DIMENSION(0:3,1:7), PARAMETER :: soil_pars = RESHAPE( (/ & |
|---|
| 455 | 3.83_wp, 1.250_wp, 1.38_wp, 6.94E-6_wp, & ! 1 |
|---|
| 456 | 3.14_wp, -2.342_wp, 1.28_wp, 1.16E-6_wp, & ! 2 |
|---|
| 457 | 0.83_wp, -0.588_wp, 1.25_wp, 0.26E-6_wp, & ! 3 |
|---|
| 458 | 3.67_wp, -1.977_wp, 1.10_wp, 2.87E-6_wp, & ! 4 |
|---|
| 459 | 2.65_wp, 2.500_wp, 1.10_wp, 1.74E-6_wp, & ! 5 |
|---|
| 460 | 1.30_wp, 0.400_wp, 1.20_wp, 0.93E-6_wp, & ! 6 |
|---|
| 461 | 0.00_wp, 0.00_wp, 0.00_wp, 0.57E-6_wp & ! 7 |
|---|
| 462 | /), (/ 4, 7 /) ) |
|---|
| 463 | |
|---|
| 464 | ! |
|---|
| 465 | !-- Soil parameters II m_sat, m_fc, m_wilt, m_res |
|---|
| 466 | REAL(wp), DIMENSION(0:3,1:7), PARAMETER :: m_soil_pars = RESHAPE( (/ & |
|---|
| 467 | 0.403_wp, 0.244_wp, 0.059_wp, 0.025_wp, & ! 1 |
|---|
| 468 | 0.439_wp, 0.347_wp, 0.151_wp, 0.010_wp, & ! 2 |
|---|
| 469 | 0.430_wp, 0.383_wp, 0.133_wp, 0.010_wp, & ! 3 |
|---|
| 470 | 0.520_wp, 0.448_wp, 0.279_wp, 0.010_wp, & ! 4 |
|---|
| 471 | 0.614_wp, 0.541_wp, 0.335_wp, 0.010_wp, & ! 5 |
|---|
| 472 | 0.766_wp, 0.663_wp, 0.267_wp, 0.010_wp, & ! 6 |
|---|
| 473 | 0.472_wp, 0.323_wp, 0.171_wp, 0.000_wp & ! 7 |
|---|
| 474 | /), (/ 4, 7 /) ) |
|---|
| 475 | |
|---|
| 476 | |
|---|
| 477 | SAVE |
|---|
| 478 | |
|---|
| 479 | |
|---|
| 480 | PRIVATE |
|---|
| 481 | |
|---|
| 482 | |
|---|
| 483 | ! |
|---|
| 484 | !-- Public parameters, constants and initial values |
|---|
| 485 | PUBLIC alpha_vangenuchten, c_surface, canopy_resistance_coefficient, & |
|---|
| 486 | conserve_water_content, dewfall, field_capacity, & |
|---|
| 487 | f_shortwave_incoming, hydraulic_conductivity, init_lsm, & |
|---|
| 488 | init_lsm_arrays, lambda_surface_stable, lambda_surface_unstable, & |
|---|
| 489 | land_surface, leaf_area_index, lsm_energy_balance, lsm_soil_model, & |
|---|
| 490 | lsm_swap_timelevel, l_vangenuchten, min_canopy_resistance, & |
|---|
| 491 | min_soil_resistance, n_vangenuchten, residual_moisture, rho_cp, & |
|---|
| 492 | rho_lv, root_fraction, saturation_moisture, skip_time_do_lsm, & |
|---|
| 493 | soil_moisture, soil_temperature, soil_type, soil_type_name, & |
|---|
| 494 | vegetation_coverage, veg_type, veg_type_name, wilting_point, z0_eb, & |
|---|
| 495 | z0h_eb |
|---|
| 496 | |
|---|
| 497 | ! |
|---|
| 498 | !-- Public grid and NetCDF variables |
|---|
| 499 | PUBLIC dots_soil, id_dim_zs_xy, id_dim_zs_xz, id_dim_zs_yz, & |
|---|
| 500 | id_dim_zs_3d, id_dim_zs_mask, id_var_zs_xy, id_var_zs_xz, & |
|---|
| 501 | id_var_zs_yz, id_var_zs_3d, id_var_zs_mask, nzb_soil, nzs, nzt_soil,& |
|---|
| 502 | zs |
|---|
| 503 | |
|---|
| 504 | ! |
|---|
| 505 | !-- Public 2D output variables |
|---|
| 506 | PUBLIC c_liq, c_liq_av, c_soil_av, c_veg, c_veg_av, ghf_eb, ghf_eb_av, & |
|---|
| 507 | lai, lai_av, qsws_eb, qsws_eb_av, qsws_liq_eb, qsws_liq_eb_av, & |
|---|
| 508 | qsws_soil_eb, qsws_soil_eb_av, qsws_veg_eb, qsws_veg_eb_av, & |
|---|
| 509 | r_a, r_a_av, r_s, r_s_av, shf_eb, shf_eb_av |
|---|
| 510 | |
|---|
| 511 | ! |
|---|
| 512 | !-- Public prognostic variables |
|---|
| 513 | PUBLIC m_liq_eb, m_liq_eb_av, m_soil, m_soil_av, t_soil, t_soil_av |
|---|
| 514 | |
|---|
| 515 | INTERFACE init_lsm |
|---|
| 516 | MODULE PROCEDURE init_lsm |
|---|
| 517 | END INTERFACE init_lsm |
|---|
| 518 | |
|---|
| 519 | INTERFACE lsm_energy_balance |
|---|
| 520 | MODULE PROCEDURE lsm_energy_balance |
|---|
| 521 | END INTERFACE lsm_energy_balance |
|---|
| 522 | |
|---|
| 523 | INTERFACE lsm_soil_model |
|---|
| 524 | MODULE PROCEDURE lsm_soil_model |
|---|
| 525 | END INTERFACE lsm_soil_model |
|---|
| 526 | |
|---|
| 527 | INTERFACE lsm_swap_timelevel |
|---|
| 528 | MODULE PROCEDURE lsm_swap_timelevel |
|---|
| 529 | END INTERFACE lsm_swap_timelevel |
|---|
| 530 | |
|---|
| 531 | CONTAINS |
|---|
| 532 | |
|---|
| 533 | |
|---|
| 534 | !------------------------------------------------------------------------------! |
|---|
| 535 | ! Description: |
|---|
| 536 | ! ------------ |
|---|
| 537 | !> Allocate land surface model arrays and define pointers |
|---|
| 538 | !------------------------------------------------------------------------------! |
|---|
| 539 | SUBROUTINE init_lsm_arrays |
|---|
| 540 | |
|---|
| 541 | |
|---|
| 542 | IMPLICIT NONE |
|---|
| 543 | |
|---|
| 544 | ! |
|---|
| 545 | !-- Allocate surface and soil temperature / humidity |
|---|
| 546 | #if defined( __nopointer ) |
|---|
| 547 | ALLOCATE ( m_liq_eb(nysg:nyng,nxlg:nxrg) ) |
|---|
| 548 | ALLOCATE ( m_liq_eb_p(nysg:nyng,nxlg:nxrg) ) |
|---|
| 549 | ALLOCATE ( m_soil(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 550 | ALLOCATE ( m_soil_p(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 551 | ALLOCATE ( t_surface(nysg:nyng,nxlg:nxrg) ) |
|---|
| 552 | ALLOCATE ( t_surface_p(nysg:nyng,nxlg:nxrg) ) |
|---|
| 553 | ALLOCATE ( t_soil(nzb_soil:nzt_soil+1,nysg:nyng,nxlg:nxrg) ) |
|---|
| 554 | ALLOCATE ( t_soil_p(nzb_soil:nzt_soil+1,nysg:nyng,nxlg:nxrg) ) |
|---|
| 555 | #else |
|---|
| 556 | ALLOCATE ( m_liq_eb_1(nysg:nyng,nxlg:nxrg) ) |
|---|
| 557 | ALLOCATE ( m_liq_eb_2(nysg:nyng,nxlg:nxrg) ) |
|---|
| 558 | ALLOCATE ( m_soil_1(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 559 | ALLOCATE ( m_soil_2(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 560 | ALLOCATE ( t_surface_1(nysg:nyng,nxlg:nxrg) ) |
|---|
| 561 | ALLOCATE ( t_surface_2(nysg:nyng,nxlg:nxrg) ) |
|---|
| 562 | ALLOCATE ( t_soil_1(nzb_soil:nzt_soil+1,nysg:nyng,nxlg:nxrg) ) |
|---|
| 563 | ALLOCATE ( t_soil_2(nzb_soil:nzt_soil+1,nysg:nyng,nxlg:nxrg) ) |
|---|
| 564 | #endif |
|---|
| 565 | |
|---|
| 566 | ! |
|---|
| 567 | !-- Allocate intermediate timestep arrays |
|---|
| 568 | ALLOCATE ( tm_liq_eb_m(nysg:nyng,nxlg:nxrg) ) |
|---|
| 569 | ALLOCATE ( tm_soil_m(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 570 | ALLOCATE ( tt_surface_m(nysg:nyng,nxlg:nxrg) ) |
|---|
| 571 | ALLOCATE ( tt_soil_m(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 572 | |
|---|
| 573 | ! |
|---|
| 574 | !-- Allocate 2D vegetation model arrays |
|---|
| 575 | ALLOCATE ( alpha_vg(nysg:nyng,nxlg:nxrg) ) |
|---|
| 576 | ALLOCATE ( c_liq(nysg:nyng,nxlg:nxrg) ) |
|---|
| 577 | ALLOCATE ( c_veg(nysg:nyng,nxlg:nxrg) ) |
|---|
| 578 | ALLOCATE ( f_sw_in(nysg:nyng,nxlg:nxrg) ) |
|---|
| 579 | ALLOCATE ( ghf_eb(nysg:nyng,nxlg:nxrg) ) |
|---|
| 580 | ALLOCATE ( gamma_w_sat(nysg:nyng,nxlg:nxrg) ) |
|---|
| 581 | ALLOCATE ( g_d(nysg:nyng,nxlg:nxrg) ) |
|---|
| 582 | ALLOCATE ( lai(nysg:nyng,nxlg:nxrg) ) |
|---|
| 583 | ALLOCATE ( l_vg(nysg:nyng,nxlg:nxrg) ) |
|---|
| 584 | ALLOCATE ( lambda_surface_u(nysg:nyng,nxlg:nxrg) ) |
|---|
| 585 | ALLOCATE ( lambda_surface_s(nysg:nyng,nxlg:nxrg) ) |
|---|
| 586 | ALLOCATE ( m_fc(nysg:nyng,nxlg:nxrg) ) |
|---|
| 587 | ALLOCATE ( m_res(nysg:nyng,nxlg:nxrg) ) |
|---|
| 588 | ALLOCATE ( m_sat(nysg:nyng,nxlg:nxrg) ) |
|---|
| 589 | ALLOCATE ( m_wilt(nysg:nyng,nxlg:nxrg) ) |
|---|
| 590 | ALLOCATE ( n_vg(nysg:nyng,nxlg:nxrg) ) |
|---|
| 591 | ALLOCATE ( qsws_eb(nysg:nyng,nxlg:nxrg) ) |
|---|
| 592 | ALLOCATE ( qsws_soil_eb(nysg:nyng,nxlg:nxrg) ) |
|---|
| 593 | ALLOCATE ( qsws_liq_eb(nysg:nyng,nxlg:nxrg) ) |
|---|
| 594 | ALLOCATE ( qsws_veg_eb(nysg:nyng,nxlg:nxrg) ) |
|---|
| 595 | ALLOCATE ( rad_net_l(nysg:nyng,nxlg:nxrg) ) |
|---|
| 596 | ALLOCATE ( r_a(nysg:nyng,nxlg:nxrg) ) |
|---|
| 597 | ALLOCATE ( r_canopy(nysg:nyng,nxlg:nxrg) ) |
|---|
| 598 | ALLOCATE ( r_soil(nysg:nyng,nxlg:nxrg) ) |
|---|
| 599 | ALLOCATE ( r_soil_min(nysg:nyng,nxlg:nxrg) ) |
|---|
| 600 | ALLOCATE ( r_s(nysg:nyng,nxlg:nxrg) ) |
|---|
| 601 | ALLOCATE ( r_canopy_min(nysg:nyng,nxlg:nxrg) ) |
|---|
| 602 | ALLOCATE ( shf_eb(nysg:nyng,nxlg:nxrg) ) |
|---|
| 603 | |
|---|
| 604 | #if ! defined( __nopointer ) |
|---|
| 605 | ! |
|---|
| 606 | !-- Initial assignment of the pointers |
|---|
| 607 | t_soil => t_soil_1; t_soil_p => t_soil_2 |
|---|
| 608 | t_surface => t_surface_1; t_surface_p => t_surface_2 |
|---|
| 609 | m_soil => m_soil_1; m_soil_p => m_soil_2 |
|---|
| 610 | m_liq_eb => m_liq_eb_1; m_liq_eb_p => m_liq_eb_2 |
|---|
| 611 | #endif |
|---|
| 612 | |
|---|
| 613 | |
|---|
| 614 | END SUBROUTINE init_lsm_arrays |
|---|
| 615 | |
|---|
| 616 | !------------------------------------------------------------------------------! |
|---|
| 617 | ! Description: |
|---|
| 618 | ! ------------ |
|---|
| 619 | !> Initialization of the land surface model |
|---|
| 620 | !------------------------------------------------------------------------------! |
|---|
| 621 | SUBROUTINE init_lsm |
|---|
| 622 | |
|---|
| 623 | |
|---|
| 624 | IMPLICIT NONE |
|---|
| 625 | |
|---|
| 626 | INTEGER(iwp) :: i !< running index |
|---|
| 627 | INTEGER(iwp) :: j !< running index |
|---|
| 628 | INTEGER(iwp) :: k !< running index |
|---|
| 629 | |
|---|
| 630 | REAL(wp) :: pt_1 !< potential temperature at first grid level |
|---|
| 631 | |
|---|
| 632 | |
|---|
| 633 | ! |
|---|
| 634 | !-- Calculate Exner function |
|---|
| 635 | exn = ( surface_pressure / 1000.0_wp )**0.286_wp |
|---|
| 636 | |
|---|
| 637 | |
|---|
| 638 | ! |
|---|
| 639 | !-- If no cloud physics is used, rho_surface has not been calculated before |
|---|
| 640 | IF ( .NOT. cloud_physics ) THEN |
|---|
| 641 | rho_surface = surface_pressure * 100.0_wp / ( r_d * pt_surface * exn ) |
|---|
| 642 | ENDIF |
|---|
| 643 | |
|---|
| 644 | ! |
|---|
| 645 | !-- Calculate frequently used parameters |
|---|
| 646 | rho_cp = cp * rho_surface |
|---|
| 647 | rd_d_rv = r_d / r_v |
|---|
| 648 | rho_lv = rho_surface * l_v |
|---|
| 649 | drho_l_lv = 1.0_wp / (rho_l * l_v) |
|---|
| 650 | |
|---|
| 651 | ! |
|---|
| 652 | !-- Set inital values for prognostic quantities |
|---|
| 653 | tt_surface_m = 0.0_wp |
|---|
| 654 | tt_soil_m = 0.0_wp |
|---|
| 655 | tm_liq_eb_m = 0.0_wp |
|---|
| 656 | c_liq = 0.0_wp |
|---|
| 657 | |
|---|
| 658 | ghf_eb = 0.0_wp |
|---|
| 659 | shf_eb = rho_cp * shf |
|---|
| 660 | |
|---|
| 661 | IF ( humidity ) THEN |
|---|
| 662 | qsws_eb = rho_l * l_v * qsws |
|---|
| 663 | ELSE |
|---|
| 664 | qsws_eb = 0.0_wp |
|---|
| 665 | ENDIF |
|---|
| 666 | |
|---|
| 667 | qsws_liq_eb = 0.0_wp |
|---|
| 668 | qsws_soil_eb = qsws_eb |
|---|
| 669 | qsws_veg_eb = 0.0_wp |
|---|
| 670 | |
|---|
| 671 | r_a = 50.0_wp |
|---|
| 672 | r_s = 50.0_wp |
|---|
| 673 | r_canopy = 0.0_wp |
|---|
| 674 | r_soil = 0.0_wp |
|---|
| 675 | |
|---|
| 676 | ! |
|---|
| 677 | !-- Allocate 3D soil model arrays |
|---|
| 678 | ALLOCATE ( root_fr(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 679 | ALLOCATE ( lambda_h(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 680 | ALLOCATE ( rho_c_total(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 681 | |
|---|
| 682 | lambda_h = 0.0_wp |
|---|
| 683 | ! |
|---|
| 684 | !-- If required, allocate humidity-related variables for the soil model |
|---|
| 685 | IF ( humidity ) THEN |
|---|
| 686 | ALLOCATE ( lambda_w(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 687 | ALLOCATE ( gamma_w(nzb_soil:nzt_soil,nysg:nyng,nxlg:nxrg) ) |
|---|
| 688 | |
|---|
| 689 | lambda_w = 0.0_wp |
|---|
| 690 | ENDIF |
|---|
| 691 | |
|---|
| 692 | ! |
|---|
| 693 | !-- Calculate grid spacings. Temperature and moisture are defined at |
|---|
| 694 | !-- the edges of the soil layers (_stag), whereas gradients/fluxes are defined |
|---|
| 695 | !-- at the centers |
|---|
| 696 | dz_soil(nzb_soil) = zs(nzb_soil) |
|---|
| 697 | |
|---|
| 698 | DO k = nzb_soil+1, nzt_soil |
|---|
| 699 | dz_soil(k) = zs(k) - zs(k-1) |
|---|
| 700 | ENDDO |
|---|
| 701 | dz_soil(nzt_soil+1) = dz_soil(nzt_soil) |
|---|
| 702 | |
|---|
| 703 | DO k = nzb_soil, nzt_soil-1 |
|---|
| 704 | dz_soil_stag(k) = 0.5_wp * (dz_soil(k+1) + dz_soil(k)) |
|---|
| 705 | ENDDO |
|---|
| 706 | dz_soil_stag(nzt_soil) = dz_soil(nzt_soil) |
|---|
| 707 | |
|---|
| 708 | ddz_soil = 1.0_wp / dz_soil |
|---|
| 709 | ddz_soil_stag = 1.0_wp / dz_soil_stag |
|---|
| 710 | |
|---|
| 711 | ! |
|---|
| 712 | !-- Initialize standard soil types. It is possible to overwrite each |
|---|
| 713 | !-- parameter by setting the respecticy NAMELIST variable to a |
|---|
| 714 | !-- value /= 9999999.9. |
|---|
| 715 | IF ( soil_type /= 0 ) THEN |
|---|
| 716 | |
|---|
| 717 | IF ( alpha_vangenuchten == 9999999.9_wp ) THEN |
|---|
| 718 | alpha_vangenuchten = soil_pars(0,soil_type) |
|---|
| 719 | ENDIF |
|---|
| 720 | |
|---|
| 721 | IF ( l_vangenuchten == 9999999.9_wp ) THEN |
|---|
| 722 | l_vangenuchten = soil_pars(1,soil_type) |
|---|
| 723 | ENDIF |
|---|
| 724 | |
|---|
| 725 | IF ( n_vangenuchten == 9999999.9_wp ) THEN |
|---|
| 726 | n_vangenuchten = soil_pars(2,soil_type) |
|---|
| 727 | ENDIF |
|---|
| 728 | |
|---|
| 729 | IF ( hydraulic_conductivity == 9999999.9_wp ) THEN |
|---|
| 730 | hydraulic_conductivity = soil_pars(3,soil_type) |
|---|
| 731 | ENDIF |
|---|
| 732 | |
|---|
| 733 | IF ( saturation_moisture == 9999999.9_wp ) THEN |
|---|
| 734 | saturation_moisture = m_soil_pars(0,soil_type) |
|---|
| 735 | ENDIF |
|---|
| 736 | |
|---|
| 737 | IF ( field_capacity == 9999999.9_wp ) THEN |
|---|
| 738 | field_capacity = m_soil_pars(1,soil_type) |
|---|
| 739 | ENDIF |
|---|
| 740 | |
|---|
| 741 | IF ( wilting_point == 9999999.9_wp ) THEN |
|---|
| 742 | wilting_point = m_soil_pars(2,soil_type) |
|---|
| 743 | ENDIF |
|---|
| 744 | |
|---|
| 745 | IF ( residual_moisture == 9999999.9_wp ) THEN |
|---|
| 746 | residual_moisture = m_soil_pars(3,soil_type) |
|---|
| 747 | ENDIF |
|---|
| 748 | |
|---|
| 749 | ENDIF |
|---|
| 750 | |
|---|
| 751 | alpha_vg = alpha_vangenuchten |
|---|
| 752 | l_vg = l_vangenuchten |
|---|
| 753 | n_vg = n_vangenuchten |
|---|
| 754 | gamma_w_sat = hydraulic_conductivity |
|---|
| 755 | m_sat = saturation_moisture |
|---|
| 756 | m_fc = field_capacity |
|---|
| 757 | m_wilt = wilting_point |
|---|
| 758 | m_res = residual_moisture |
|---|
| 759 | r_soil_min = min_soil_resistance |
|---|
| 760 | |
|---|
| 761 | ! |
|---|
| 762 | !-- Initial run actions |
|---|
| 763 | IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN |
|---|
| 764 | |
|---|
| 765 | t_soil = 0.0_wp |
|---|
| 766 | m_liq_eb = 0.0_wp |
|---|
| 767 | m_soil = 0.0_wp |
|---|
| 768 | |
|---|
| 769 | ! |
|---|
| 770 | !-- Map user settings of T and q for each soil layer |
|---|
| 771 | !-- (make sure that the soil moisture does not drop below the permanent |
|---|
| 772 | !-- wilting point) -> problems with devision by zero) |
|---|
| 773 | DO k = nzb_soil, nzt_soil |
|---|
| 774 | t_soil(k,:,:) = soil_temperature(k) |
|---|
| 775 | m_soil(k,:,:) = MAX(soil_moisture(k),m_wilt(:,:)) |
|---|
| 776 | soil_moisture(k) = MAX(soil_moisture(k),wilting_point) |
|---|
| 777 | ENDDO |
|---|
| 778 | t_soil(nzt_soil+1,:,:) = soil_temperature(nzt_soil+1) |
|---|
| 779 | |
|---|
| 780 | ! |
|---|
| 781 | !-- Calculate surface temperature |
|---|
| 782 | t_surface = pt_surface * exn |
|---|
| 783 | t_surface_p = t_surface |
|---|
| 784 | |
|---|
| 785 | ! |
|---|
| 786 | !-- Set artifical values for ts and us so that r_a has its initial value for |
|---|
| 787 | !-- the first time step |
|---|
| 788 | DO i = nxlg, nxrg |
|---|
| 789 | DO j = nysg, nyng |
|---|
| 790 | k = nzb_s_inner(j,i) |
|---|
| 791 | |
|---|
| 792 | IF ( cloud_physics ) THEN |
|---|
| 793 | pt_1 = pt(k+1,j,i) + l_d_cp * pt_d_t(k+1) * ql(k+1,j,i) |
|---|
| 794 | ELSE |
|---|
| 795 | pt_1 = pt(k+1,j,i) |
|---|
| 796 | ENDIF |
|---|
| 797 | |
|---|
| 798 | ! |
|---|
| 799 | !-- Assure that r_a cannot be zero at model start |
|---|
| 800 | IF ( pt_1 == pt(k,j,i) ) pt_1 = pt_1 + 1.0E-10_wp |
|---|
| 801 | |
|---|
| 802 | us(j,i) = 0.1_wp |
|---|
| 803 | ts(j,i) = (pt_1 - pt(k,j,i)) / r_a(j,i) |
|---|
| 804 | shf(j,i) = - us(j,i) * ts(j,i) |
|---|
| 805 | ENDDO |
|---|
| 806 | ENDDO |
|---|
| 807 | |
|---|
| 808 | ! |
|---|
| 809 | !-- Actions for restart runs |
|---|
| 810 | ELSE |
|---|
| 811 | |
|---|
| 812 | DO i = nxlg, nxrg |
|---|
| 813 | DO j = nysg, nyng |
|---|
| 814 | k = nzb_s_inner(j,i) |
|---|
| 815 | t_surface(j,i) = pt(k,j,i) * exn |
|---|
| 816 | ENDDO |
|---|
| 817 | ENDDO |
|---|
| 818 | |
|---|
| 819 | ENDIF |
|---|
| 820 | |
|---|
| 821 | DO k = nzb_soil, nzt_soil |
|---|
| 822 | root_fr(k,:,:) = root_fraction(k) |
|---|
| 823 | ENDDO |
|---|
| 824 | |
|---|
| 825 | IF ( veg_type /= 0 ) THEN |
|---|
| 826 | IF ( min_canopy_resistance == 9999999.9_wp ) THEN |
|---|
| 827 | min_canopy_resistance = veg_pars(0,veg_type) |
|---|
| 828 | ENDIF |
|---|
| 829 | IF ( leaf_area_index == 9999999.9_wp ) THEN |
|---|
| 830 | leaf_area_index = veg_pars(1,veg_type) |
|---|
| 831 | ENDIF |
|---|
| 832 | IF ( vegetation_coverage == 9999999.9_wp ) THEN |
|---|
| 833 | vegetation_coverage = veg_pars(2,veg_type) |
|---|
| 834 | ENDIF |
|---|
| 835 | IF ( canopy_resistance_coefficient == 9999999.9_wp ) THEN |
|---|
| 836 | canopy_resistance_coefficient= veg_pars(3,veg_type) |
|---|
| 837 | ENDIF |
|---|
| 838 | IF ( lambda_surface_stable == 9999999.9_wp ) THEN |
|---|
| 839 | lambda_surface_stable = surface_pars(0,veg_type) |
|---|
| 840 | ENDIF |
|---|
| 841 | IF ( lambda_surface_unstable == 9999999.9_wp ) THEN |
|---|
| 842 | lambda_surface_unstable = surface_pars(1,veg_type) |
|---|
| 843 | ENDIF |
|---|
| 844 | IF ( f_shortwave_incoming == 9999999.9_wp ) THEN |
|---|
| 845 | f_shortwave_incoming = surface_pars(2,veg_type) |
|---|
| 846 | ENDIF |
|---|
| 847 | IF ( z0_eb == 9999999.9_wp ) THEN |
|---|
| 848 | roughness_length = roughness_par(0,veg_type) |
|---|
| 849 | z0_eb = roughness_par(0,veg_type) |
|---|
| 850 | ENDIF |
|---|
| 851 | IF ( z0h_eb == 9999999.9_wp ) THEN |
|---|
| 852 | z0h_eb = roughness_par(1,veg_type) |
|---|
| 853 | ENDIF |
|---|
| 854 | z0h_factor = z0h_eb / z0_eb |
|---|
| 855 | |
|---|
| 856 | IF ( ANY( root_fraction == 9999999.9_wp ) ) THEN |
|---|
| 857 | DO k = nzb_soil, nzt_soil |
|---|
| 858 | root_fr(k,:,:) = root_distribution(k,veg_type) |
|---|
| 859 | root_fraction(k) = root_distribution(k,veg_type) |
|---|
| 860 | ENDDO |
|---|
| 861 | ENDIF |
|---|
| 862 | |
|---|
| 863 | ELSE |
|---|
| 864 | |
|---|
| 865 | IF ( z0_eb == 9999999.9_wp ) THEN |
|---|
| 866 | z0_eb = roughness_length |
|---|
| 867 | ENDIF |
|---|
| 868 | IF ( z0h_eb == 9999999.9_wp ) THEN |
|---|
| 869 | z0h_eb = z0_eb * z0h_factor |
|---|
| 870 | ENDIF |
|---|
| 871 | |
|---|
| 872 | ENDIF |
|---|
| 873 | |
|---|
| 874 | ! |
|---|
| 875 | !-- Initialize vegetation |
|---|
| 876 | r_canopy_min = min_canopy_resistance |
|---|
| 877 | lai = leaf_area_index |
|---|
| 878 | c_veg = vegetation_coverage |
|---|
| 879 | g_d = canopy_resistance_coefficient |
|---|
| 880 | lambda_surface_s = lambda_surface_stable |
|---|
| 881 | lambda_surface_u = lambda_surface_unstable |
|---|
| 882 | f_sw_in = f_shortwave_incoming |
|---|
| 883 | z0 = z0_eb |
|---|
| 884 | z0h = z0h_eb |
|---|
| 885 | |
|---|
| 886 | ! |
|---|
| 887 | !-- Possibly do user-defined actions (e.g. define heterogeneous land surface) |
|---|
| 888 | CALL user_init_land_surface |
|---|
| 889 | |
|---|
| 890 | |
|---|
| 891 | t_soil_p = t_soil |
|---|
| 892 | m_soil_p = m_soil |
|---|
| 893 | m_liq_eb_p = m_liq_eb |
|---|
| 894 | |
|---|
| 895 | !-- Store initial profiles of t_soil and m_soil (assuming they are |
|---|
| 896 | !-- horizontally homogeneous on this PE) |
|---|
| 897 | hom(nzb_soil:nzt_soil,1,90,:) = SPREAD( t_soil(nzb_soil:nzt_soil, & |
|---|
| 898 | nysg,nxlg), 2, & |
|---|
| 899 | statistic_regions+1 ) |
|---|
| 900 | hom(nzb_soil:nzt_soil,1,92,:) = SPREAD( m_soil(nzb_soil:nzt_soil, & |
|---|
| 901 | nysg,nxlg), 2, & |
|---|
| 902 | statistic_regions+1 ) |
|---|
| 903 | |
|---|
| 904 | ! |
|---|
| 905 | !-- Add timeseries for land surface model |
|---|
| 906 | dots_soil = dots_num + 1 |
|---|
| 907 | dots_num = dots_num + 8 |
|---|
| 908 | |
|---|
| 909 | dots_label(dots_soil) = "ghf_eb" |
|---|
| 910 | dots_label(dots_soil+1) = "shf_eb" |
|---|
| 911 | dots_label(dots_soil+2) = "qsws_eb" |
|---|
| 912 | dots_label(dots_soil+3) = "qsws_liq_eb" |
|---|
| 913 | dots_label(dots_soil+4) = "qsws_soil_eb" |
|---|
| 914 | dots_label(dots_soil+5) = "qsws_veg_eb" |
|---|
| 915 | dots_label(dots_soil+6) = "r_a" |
|---|
| 916 | dots_label(dots_soil+7) = "r_s" |
|---|
| 917 | |
|---|
| 918 | dots_unit(dots_soil:dots_soil+5) = "W/m2" |
|---|
| 919 | dots_unit(dots_soil+6:dots_soil+7) = "s/m" |
|---|
| 920 | |
|---|
| 921 | RETURN |
|---|
| 922 | |
|---|
| 923 | END SUBROUTINE init_lsm |
|---|
| 924 | |
|---|
| 925 | |
|---|
| 926 | |
|---|
| 927 | !------------------------------------------------------------------------------! |
|---|
| 928 | ! Description: |
|---|
| 929 | ! ------------ |
|---|
| 930 | !> Solver for the energy balance at the surface. |
|---|
| 931 | !------------------------------------------------------------------------------! |
|---|
| 932 | SUBROUTINE lsm_energy_balance |
|---|
| 933 | |
|---|
| 934 | |
|---|
| 935 | IMPLICIT NONE |
|---|
| 936 | |
|---|
| 937 | INTEGER(iwp) :: i !< running index |
|---|
| 938 | INTEGER(iwp) :: j !< running index |
|---|
| 939 | INTEGER(iwp) :: k, ks !< running index |
|---|
| 940 | |
|---|
| 941 | REAL(wp) :: f1, & !< resistance correction term 1 |
|---|
| 942 | f2, & !< resistance correction term 2 |
|---|
| 943 | f3, & !< resistance correction term 3 |
|---|
| 944 | m_min, & !< minimum soil moisture |
|---|
| 945 | e, & !< water vapour pressure |
|---|
| 946 | e_s, & !< water vapour saturation pressure |
|---|
| 947 | e_s_dt, & !< derivate of e_s with respect to T |
|---|
| 948 | tend, & !< tendency |
|---|
| 949 | dq_s_dt, & !< derivate of q_s with respect to T |
|---|
| 950 | coef_1, & !< coef. for prognostic equation |
|---|
| 951 | coef_2, & !< coef. for prognostic equation |
|---|
| 952 | f_qsws, & !< factor for qsws_eb |
|---|
| 953 | f_qsws_veg, & !< factor for qsws_veg_eb |
|---|
| 954 | f_qsws_soil, & !< factor for qsws_soil_eb |
|---|
| 955 | f_qsws_liq, & !< factor for qsws_liq_eb |
|---|
| 956 | f_shf, & !< factor for shf_eb |
|---|
| 957 | lambda_surface, & !< Current value of lambda_surface |
|---|
| 958 | m_liq_eb_max, & !< maxmimum value of the liq. water reservoir |
|---|
| 959 | pt_1, & !< potential temperature at first grid level |
|---|
| 960 | qv_1 !< specific humidity at first grid level |
|---|
| 961 | |
|---|
| 962 | ! |
|---|
| 963 | !-- Calculate the exner function for the current time step |
|---|
| 964 | exn = ( surface_pressure / 1000.0_wp )**0.286_wp |
|---|
| 965 | |
|---|
| 966 | DO i = nxlg, nxrg |
|---|
| 967 | DO j = nysg, nyng |
|---|
| 968 | k = nzb_s_inner(j,i) |
|---|
| 969 | |
|---|
| 970 | ! |
|---|
| 971 | !-- Set lambda_surface according to stratification |
|---|
| 972 | IF ( ol(j,i) >= 0.0_wp ) THEN |
|---|
| 973 | lambda_surface = lambda_surface_s(j,i) |
|---|
| 974 | ELSE |
|---|
| 975 | lambda_surface = lambda_surface_u(j,i) |
|---|
| 976 | ENDIF |
|---|
| 977 | |
|---|
| 978 | ! |
|---|
| 979 | !-- First step: calculate aerodyamic resistance. As pt, us, ts |
|---|
| 980 | !-- are not available for the prognostic time step, data from the last |
|---|
| 981 | !-- time step is used here. Note that this formulation is the |
|---|
| 982 | !-- equivalent to the ECMWF formulation using drag coefficients |
|---|
| 983 | IF ( cloud_physics ) THEN |
|---|
| 984 | pt_1 = pt(k+1,j,i) + l_d_cp * pt_d_t(k+1) * ql(k+1,j,i) |
|---|
| 985 | qv_1 = q(k+1,j,i) - ql(k+1,j,i) |
|---|
| 986 | ELSE |
|---|
| 987 | pt_1 = pt(k+1,j,i) |
|---|
| 988 | qv_1 = q(k+1,j,i) |
|---|
| 989 | ENDIF |
|---|
| 990 | |
|---|
| 991 | r_a(j,i) = (pt_1 - pt(k,j,i)) / (ts(j,i) * us(j,i) + 1.0E-20_wp) |
|---|
| 992 | |
|---|
| 993 | ! |
|---|
| 994 | !-- Second step: calculate canopy resistance r_canopy |
|---|
| 995 | !-- f1-f3 here are defined as 1/f1-f3 as in ECMWF documentation |
|---|
| 996 | |
|---|
| 997 | !-- f1: correction for incoming shortwave radiation (stomata close at |
|---|
| 998 | !-- night) |
|---|
| 999 | IF ( radiation_scheme /= 'constant' ) THEN |
|---|
| 1000 | f1 = MIN( 1.0_wp, ( 0.004_wp * rad_sw_in(k,j,i) + 0.05_wp ) /& |
|---|
| 1001 | (0.81_wp * (0.004_wp * rad_sw_in(k,j,i) & |
|---|
| 1002 | + 1.0_wp)) ) |
|---|
| 1003 | ELSE |
|---|
| 1004 | f1 = 1.0_wp |
|---|
| 1005 | ENDIF |
|---|
| 1006 | |
|---|
| 1007 | ! |
|---|
| 1008 | !-- f2: correction for soil moisture availability to plants (the |
|---|
| 1009 | !-- integrated soil moisture must thus be considered here) |
|---|
| 1010 | !-- f2 = 0 for very dry soils |
|---|
| 1011 | m_total = 0.0_wp |
|---|
| 1012 | DO ks = nzb_soil, nzt_soil |
|---|
| 1013 | m_total = m_total + root_fr(ks,j,i) & |
|---|
| 1014 | * MAX(m_soil(ks,j,i),m_wilt(j,i)) |
|---|
| 1015 | ENDDO |
|---|
| 1016 | |
|---|
| 1017 | IF ( m_total > m_wilt(j,i) .AND. m_total < m_fc(j,i) ) THEN |
|---|
| 1018 | f2 = ( m_total - m_wilt(j,i) ) / (m_fc(j,i) - m_wilt(j,i) ) |
|---|
| 1019 | ELSEIF ( m_total >= m_fc(j,i) ) THEN |
|---|
| 1020 | f2 = 1.0_wp |
|---|
| 1021 | ELSE |
|---|
| 1022 | f2 = 1.0E-20_wp |
|---|
| 1023 | ENDIF |
|---|
| 1024 | |
|---|
| 1025 | ! |
|---|
| 1026 | !-- Calculate water vapour pressure at saturation |
|---|
| 1027 | e_s = 0.01_wp * 610.78_wp * EXP( 17.269_wp * ( t_surface(j,i) & |
|---|
| 1028 | - 273.16_wp ) / ( t_surface(j,i) - 35.86_wp ) ) |
|---|
| 1029 | |
|---|
| 1030 | ! |
|---|
| 1031 | !-- f3: correction for vapour pressure deficit |
|---|
| 1032 | IF ( g_d(j,i) /= 0.0_wp ) THEN |
|---|
| 1033 | ! |
|---|
| 1034 | !-- Calculate vapour pressure |
|---|
| 1035 | e = qv_1 * surface_pressure / 0.622_wp |
|---|
| 1036 | f3 = EXP ( -g_d(j,i) * (e_s - e) ) |
|---|
| 1037 | ELSE |
|---|
| 1038 | f3 = 1.0_wp |
|---|
| 1039 | ENDIF |
|---|
| 1040 | |
|---|
| 1041 | ! |
|---|
| 1042 | !-- Calculate canopy resistance. In case that c_veg is 0 (bare soils), |
|---|
| 1043 | !-- this calculation is obsolete, as r_canopy is not used below. |
|---|
| 1044 | !-- To do: check for very dry soil -> r_canopy goes to infinity |
|---|
| 1045 | r_canopy(j,i) = r_canopy_min(j,i) / (lai(j,i) * f1 * f2 * f3 & |
|---|
| 1046 | + 1.0E-20_wp) |
|---|
| 1047 | |
|---|
| 1048 | ! |
|---|
| 1049 | !-- Third step: calculate bare soil resistance r_soil. The Clapp & |
|---|
| 1050 | !-- Hornberger parametrization does not consider c_veg. |
|---|
| 1051 | IF ( soil_type /= 7 ) THEN |
|---|
| 1052 | m_min = c_veg(j,i) * m_wilt(j,i) + (1.0_wp - c_veg(j,i)) * & |
|---|
| 1053 | m_res(j,i) |
|---|
| 1054 | ELSE |
|---|
| 1055 | m_min = m_wilt(j,i) |
|---|
| 1056 | ENDIF |
|---|
| 1057 | |
|---|
| 1058 | f2 = ( m_soil(nzb_soil,j,i) - m_min ) / ( m_fc(j,i) - m_min ) |
|---|
| 1059 | f2 = MAX(f2,1.0E-20_wp) |
|---|
| 1060 | f2 = MIN(f2,1.0_wp) |
|---|
| 1061 | |
|---|
| 1062 | r_soil(j,i) = r_soil_min(j,i) / f2 |
|---|
| 1063 | |
|---|
| 1064 | ! |
|---|
| 1065 | !-- Calculate fraction of liquid water reservoir |
|---|
| 1066 | m_liq_eb_max = m_max_depth * lai(j,i) |
|---|
| 1067 | c_liq(j,i) = MIN(1.0_wp, m_liq_eb(j,i) / (m_liq_eb_max+1.0E-20_wp)) |
|---|
| 1068 | |
|---|
| 1069 | |
|---|
| 1070 | ! |
|---|
| 1071 | !-- Calculate saturation specific humidity |
|---|
| 1072 | q_s = 0.622_wp * e_s / surface_pressure |
|---|
| 1073 | |
|---|
| 1074 | ! |
|---|
| 1075 | !-- In case of dewfall, set evapotranspiration to zero |
|---|
| 1076 | !-- All super-saturated water is then removed from the air |
|---|
| 1077 | IF ( humidity .AND. q_s <= qv_1 ) THEN |
|---|
| 1078 | r_canopy(j,i) = 0.0_wp |
|---|
| 1079 | r_soil(j,i) = 0.0_wp |
|---|
| 1080 | ENDIF |
|---|
| 1081 | |
|---|
| 1082 | ! |
|---|
| 1083 | !-- Calculate coefficients for the total evapotranspiration |
|---|
| 1084 | f_qsws_veg = rho_lv * c_veg(j,i) * (1.0_wp - c_liq(j,i))/ & |
|---|
| 1085 | (r_a(j,i) + r_canopy(j,i)) |
|---|
| 1086 | |
|---|
| 1087 | f_qsws_soil = rho_lv * (1.0_wp - c_veg(j,i)) / (r_a(j,i) + & |
|---|
| 1088 | r_soil(j,i)) |
|---|
| 1089 | f_qsws_liq = rho_lv * c_veg(j,i) * c_liq(j,i) / r_a(j,i) |
|---|
| 1090 | |
|---|
| 1091 | |
|---|
| 1092 | ! |
|---|
| 1093 | !-- If soil moisture is below wilting point, plants do no longer |
|---|
| 1094 | !-- transpirate. |
|---|
| 1095 | ! IF ( m_soil(k,j,i) < m_wilt(j,i) ) THEN |
|---|
| 1096 | ! f_qsws_veg = 0.0_wp |
|---|
| 1097 | ! ENDIF |
|---|
| 1098 | |
|---|
| 1099 | ! |
|---|
| 1100 | !-- If dewfall is deactivated, vegetation, soil and liquid water |
|---|
| 1101 | !-- reservoir are not allowed to take up water from the super-saturated |
|---|
| 1102 | !-- air. |
|---|
| 1103 | IF ( humidity ) THEN |
|---|
| 1104 | IF ( q_s <= qv_1 ) THEN |
|---|
| 1105 | IF ( .NOT. dewfall ) THEN |
|---|
| 1106 | f_qsws_veg = 0.0_wp |
|---|
| 1107 | f_qsws_soil = 0.0_wp |
|---|
| 1108 | f_qsws_liq = 0.0_wp |
|---|
| 1109 | ENDIF |
|---|
| 1110 | ENDIF |
|---|
| 1111 | ENDIF |
|---|
| 1112 | |
|---|
| 1113 | f_shf = rho_cp / r_a(j,i) |
|---|
| 1114 | f_qsws = f_qsws_veg + f_qsws_soil + f_qsws_liq |
|---|
| 1115 | |
|---|
| 1116 | ! |
|---|
| 1117 | !-- Calculate derivative of q_s for Taylor series expansion |
|---|
| 1118 | e_s_dt = e_s * ( 17.269_wp / (t_surface(j,i) - 35.86_wp) - & |
|---|
| 1119 | 17.269_wp*(t_surface(j,i) - 273.16_wp) & |
|---|
| 1120 | / (t_surface(j,i) - 35.86_wp)**2 ) |
|---|
| 1121 | |
|---|
| 1122 | dq_s_dt = 0.622_wp * e_s_dt / surface_pressure |
|---|
| 1123 | |
|---|
| 1124 | ! |
|---|
| 1125 | !-- Add LW up so that it can be removed in prognostic equation |
|---|
| 1126 | rad_net_l(j,i) = rad_net(j,i) + rad_lw_out(nzb,j,i) |
|---|
| 1127 | |
|---|
| 1128 | |
|---|
| 1129 | IF ( humidity ) THEN |
|---|
| 1130 | #if defined ( __rrtmg ) |
|---|
| 1131 | ! |
|---|
| 1132 | !-- Numerator of the prognostic equation |
|---|
| 1133 | coef_1 = rad_net_l(j,i) + rrtm_lwuflx_dt(0,nzb) & |
|---|
| 1134 | * t_surface(j,i) - rad_lw_out(nzb,j,i) & |
|---|
| 1135 | + f_shf * pt_1 + f_qsws * ( qv_1 - q_s & |
|---|
| 1136 | + dq_s_dt * t_surface(j,i) ) + lambda_surface & |
|---|
| 1137 | * t_soil(nzb_soil,j,i) |
|---|
| 1138 | |
|---|
| 1139 | ! |
|---|
| 1140 | !-- Denominator of the prognostic equation |
|---|
| 1141 | coef_2 = rrtm_lwuflx_dt(0,nzb) + f_qsws * dq_s_dt & |
|---|
| 1142 | + lambda_surface + f_shf / exn |
|---|
| 1143 | #else |
|---|
| 1144 | |
|---|
| 1145 | ! |
|---|
| 1146 | !-- Numerator of the prognostic equation |
|---|
| 1147 | coef_1 = rad_net_l(j,i) + 3.0_wp * sigma_sb & |
|---|
| 1148 | * t_surface(j,i) ** 4 & |
|---|
| 1149 | + f_shf * pt_1 + f_qsws * ( qv_1 & |
|---|
| 1150 | - q_s + dq_s_dt * t_surface(j,i) ) & |
|---|
| 1151 | + lambda_surface * t_soil(nzb_soil,j,i) |
|---|
| 1152 | |
|---|
| 1153 | ! |
|---|
| 1154 | !-- Denominator of the prognostic equation |
|---|
| 1155 | coef_2 = 4.0_wp * sigma_sb * t_surface(j,i) ** 3 + f_qsws & |
|---|
| 1156 | * dq_s_dt + lambda_surface + f_shf / exn |
|---|
| 1157 | |
|---|
| 1158 | #endif |
|---|
| 1159 | ELSE |
|---|
| 1160 | |
|---|
| 1161 | #if defined ( __rrtmg ) |
|---|
| 1162 | ! |
|---|
| 1163 | !-- Numerator of the prognostic equation |
|---|
| 1164 | coef_1 = rad_net_l(j,i) + rrtm_lwuflx_dt(0,nzb) & |
|---|
| 1165 | * t_surface(j,i) - rad_lw_out(nzb,j,i) & |
|---|
| 1166 | + f_shf * pt_1 + lambda_surface & |
|---|
| 1167 | * t_soil(nzb_soil,j,i) |
|---|
| 1168 | |
|---|
| 1169 | ! |
|---|
| 1170 | !-- Denominator of the prognostic equation |
|---|
| 1171 | coef_2 = rrtm_lwuflx_dt(0,nzb) + lambda_surface + f_shf / exn |
|---|
| 1172 | #else |
|---|
| 1173 | |
|---|
| 1174 | ! |
|---|
| 1175 | !-- Numerator of the prognostic equation |
|---|
| 1176 | coef_1 = rad_net_l(j,i) + 3.0_wp * sigma_sb & |
|---|
| 1177 | * t_surface(j,i) ** 4 + f_shf * pt_1 & |
|---|
| 1178 | + lambda_surface * t_soil(nzb_soil,j,i) |
|---|
| 1179 | |
|---|
| 1180 | ! |
|---|
| 1181 | !-- Denominator of the prognostic equation |
|---|
| 1182 | coef_2 = 4.0_wp * sigma_sb * t_surface(j,i) ** 3 & |
|---|
| 1183 | + lambda_surface + f_shf / exn |
|---|
| 1184 | #endif |
|---|
| 1185 | ENDIF |
|---|
| 1186 | |
|---|
| 1187 | |
|---|
| 1188 | tend = 0.0_wp |
|---|
| 1189 | |
|---|
| 1190 | ! |
|---|
| 1191 | !-- Implicit solution when the surface layer has no heat capacity, |
|---|
| 1192 | !-- otherwise use RK3 scheme. |
|---|
| 1193 | t_surface_p(j,i) = ( coef_1 * dt_3d * tsc(2) + c_surface * & |
|---|
| 1194 | t_surface(j,i) ) / ( c_surface + coef_2 * dt_3d& |
|---|
| 1195 | * tsc(2) ) |
|---|
| 1196 | ! |
|---|
| 1197 | !-- Add RK3 term |
|---|
| 1198 | IF ( c_surface /= 0.0_wp ) THEN |
|---|
| 1199 | |
|---|
| 1200 | t_surface_p(j,i) = t_surface_p(j,i) + dt_3d * tsc(3) & |
|---|
| 1201 | * tt_surface_m(j,i) |
|---|
| 1202 | |
|---|
| 1203 | ! |
|---|
| 1204 | !-- Calculate true tendency |
|---|
| 1205 | tend = (t_surface_p(j,i) - t_surface(j,i) - dt_3d * tsc(3) & |
|---|
| 1206 | * tt_surface_m(j,i)) / (dt_3d * tsc(2)) |
|---|
| 1207 | ! |
|---|
| 1208 | !-- Calculate t_surface tendencies for the next Runge-Kutta step |
|---|
| 1209 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
|---|
| 1210 | IF ( intermediate_timestep_count == 1 ) THEN |
|---|
| 1211 | tt_surface_m(j,i) = tend |
|---|
| 1212 | ELSEIF ( intermediate_timestep_count < & |
|---|
| 1213 | intermediate_timestep_count_max ) THEN |
|---|
| 1214 | tt_surface_m(j,i) = -9.5625_wp * tend + 5.3125_wp & |
|---|
| 1215 | * tt_surface_m(j,i) |
|---|
| 1216 | ENDIF |
|---|
| 1217 | ENDIF |
|---|
| 1218 | |
|---|
| 1219 | ENDIF |
|---|
| 1220 | |
|---|
| 1221 | ! |
|---|
| 1222 | !-- In case of fast changes in the skin temperature, it is required to |
|---|
| 1223 | !-- update the radiative fluxes in order to keep the solution stable |
|---|
| 1224 | IF ( ABS( t_surface_p(j,i) - t_surface(j,i) ) > 0.2_wp ) THEN |
|---|
| 1225 | force_radiation_call_l = .TRUE. |
|---|
| 1226 | ENDIF |
|---|
| 1227 | |
|---|
| 1228 | pt(k,j,i) = t_surface_p(j,i) / exn |
|---|
| 1229 | |
|---|
| 1230 | ! |
|---|
| 1231 | !-- Calculate fluxes |
|---|
| 1232 | #if defined ( __rrtmg ) |
|---|
| 1233 | rad_net_l(j,i) = rad_net_l(j,i) + rrtm_lwuflx_dt(0,nzb) & |
|---|
| 1234 | * t_surface(j,i) - rad_lw_out(nzb,j,i) & |
|---|
| 1235 | - rrtm_lwuflx_dt(0,nzb) * t_surface_p(j,i) |
|---|
| 1236 | |
|---|
| 1237 | IF ( rrtm_idrv == 1 ) THEN |
|---|
| 1238 | rad_net(j,i) = rad_net_l(j,i) |
|---|
| 1239 | rad_lw_out(nzb,j,i) = rad_lw_out(nzb,j,i) & |
|---|
| 1240 | + rrtm_lwuflx_dt(0,nzb) & |
|---|
| 1241 | * ( t_surface_p(j,i) - t_surface(j,i) ) |
|---|
| 1242 | ENDIF |
|---|
| 1243 | #else |
|---|
| 1244 | rad_net_l(j,i) = rad_net_l(j,i) + 3.0_wp * sigma_sb & |
|---|
| 1245 | * t_surface(j,i)**4 - 4.0_wp * sigma_sb & |
|---|
| 1246 | * t_surface(j,i)**3 * t_surface_p(j,i) |
|---|
| 1247 | rad_net(j,i) = rad_net_l(j,i) |
|---|
| 1248 | #endif |
|---|
| 1249 | |
|---|
| 1250 | ghf_eb(j,i) = lambda_surface * (t_surface_p(j,i) & |
|---|
| 1251 | - t_soil(nzb_soil,j,i)) |
|---|
| 1252 | |
|---|
| 1253 | shf_eb(j,i) = - f_shf * ( pt_1 - pt(k,j,i) ) |
|---|
| 1254 | |
|---|
| 1255 | shf(j,i) = shf_eb(j,i) / rho_cp |
|---|
| 1256 | |
|---|
| 1257 | IF ( humidity ) THEN |
|---|
| 1258 | qsws_eb(j,i) = - f_qsws * ( qv_1 - q_s + dq_s_dt & |
|---|
| 1259 | * t_surface(j,i) - dq_s_dt * t_surface_p(j,i) ) |
|---|
| 1260 | |
|---|
| 1261 | qsws(j,i) = qsws_eb(j,i) / rho_lv |
|---|
| 1262 | |
|---|
| 1263 | qsws_veg_eb(j,i) = - f_qsws_veg * ( qv_1 - q_s & |
|---|
| 1264 | + dq_s_dt * t_surface(j,i) - dq_s_dt & |
|---|
| 1265 | * t_surface_p(j,i) ) |
|---|
| 1266 | |
|---|
| 1267 | qsws_soil_eb(j,i) = - f_qsws_soil * ( qv_1 - q_s & |
|---|
| 1268 | + dq_s_dt * t_surface(j,i) - dq_s_dt & |
|---|
| 1269 | * t_surface_p(j,i) ) |
|---|
| 1270 | |
|---|
| 1271 | qsws_liq_eb(j,i) = - f_qsws_liq * ( qv_1 - q_s & |
|---|
| 1272 | + dq_s_dt * t_surface(j,i) - dq_s_dt & |
|---|
| 1273 | * t_surface_p(j,i) ) |
|---|
| 1274 | ENDIF |
|---|
| 1275 | ! |
|---|
| 1276 | !-- Calculate the true surface resistance |
|---|
| 1277 | IF ( qsws_eb(j,i) == 0.0_wp ) THEN |
|---|
| 1278 | r_s(j,i) = 1.0E10_wp |
|---|
| 1279 | ELSE |
|---|
| 1280 | r_s(j,i) = - rho_lv * ( qv_1 - q_s + dq_s_dt & |
|---|
| 1281 | * t_surface(j,i) - dq_s_dt * t_surface_p(j,i) ) & |
|---|
| 1282 | / qsws_eb(j,i) - r_a(j,i) |
|---|
| 1283 | ENDIF |
|---|
| 1284 | |
|---|
| 1285 | ! |
|---|
| 1286 | !-- Calculate change in liquid water reservoir due to dew fall or |
|---|
| 1287 | !-- evaporation of liquid water |
|---|
| 1288 | IF ( humidity ) THEN |
|---|
| 1289 | ! |
|---|
| 1290 | !-- If precipitation is activated, add rain water to qsws_liq_eb |
|---|
| 1291 | !-- and qsws_soil_eb according the the vegetation coverage. |
|---|
| 1292 | !-- precipitation_rate is given in mm. |
|---|
| 1293 | IF ( precipitation ) THEN |
|---|
| 1294 | |
|---|
| 1295 | ! |
|---|
| 1296 | !-- Add precipitation to liquid water reservoir, if possible. |
|---|
| 1297 | !-- Otherwise, add the water to bare soil fraction. |
|---|
| 1298 | IF ( m_liq_eb(j,i) /= m_liq_eb_max ) THEN |
|---|
| 1299 | qsws_liq_eb(j,i) = qsws_liq_eb(j,i) & |
|---|
| 1300 | + c_veg(j,i) * prr(k,j,i) * hyrho(k) & |
|---|
| 1301 | * 0.001_wp * rho_l * l_v |
|---|
| 1302 | ELSE |
|---|
| 1303 | qsws_soil_eb(j,i) = qsws_soil_eb(j,i) & |
|---|
| 1304 | + c_veg(j,i) * prr(k,j,i) * hyrho(k) & |
|---|
| 1305 | * 0.001_wp * rho_l * l_v |
|---|
| 1306 | ENDIF |
|---|
| 1307 | |
|---|
| 1308 | !-- Add precipitation to bare soil according to the bare soil |
|---|
| 1309 | !-- coverage. |
|---|
| 1310 | qsws_soil_eb(j,i) = qsws_soil_eb(j,i) * (1.0_wp & |
|---|
| 1311 | - c_veg(j,i)) * prr(k,j,i) * hyrho(k) & |
|---|
| 1312 | * 0.001_wp * rho_l * l_v |
|---|
| 1313 | ENDIF |
|---|
| 1314 | |
|---|
| 1315 | ! |
|---|
| 1316 | !-- If the air is saturated, check the reservoir water level |
|---|
| 1317 | IF ( qsws_eb(j,i) < 0.0_wp ) THEN |
|---|
| 1318 | |
|---|
| 1319 | ! |
|---|
| 1320 | !-- Check if reservoir is full (avoid values > m_liq_eb_max) |
|---|
| 1321 | !-- In that case, qsws_liq_eb goes to qsws_soil_eb. In this |
|---|
| 1322 | !-- case qsws_veg_eb is zero anyway (because c_liq = 1), |
|---|
| 1323 | !-- so that tend is zero and no further check is needed |
|---|
| 1324 | IF ( m_liq_eb(j,i) == m_liq_eb_max ) THEN |
|---|
| 1325 | qsws_soil_eb(j,i) = qsws_soil_eb(j,i) & |
|---|
| 1326 | + qsws_liq_eb(j,i) |
|---|
| 1327 | qsws_liq_eb(j,i) = 0.0_wp |
|---|
| 1328 | ENDIF |
|---|
| 1329 | |
|---|
| 1330 | ! |
|---|
| 1331 | !-- In case qsws_veg_eb becomes negative (unphysical behavior), |
|---|
| 1332 | !-- let the water enter the liquid water reservoir as dew on the |
|---|
| 1333 | !-- plant |
|---|
| 1334 | IF ( qsws_veg_eb(j,i) < 0.0_wp ) THEN |
|---|
| 1335 | qsws_liq_eb(j,i) = qsws_liq_eb(j,i) + qsws_veg_eb(j,i) |
|---|
| 1336 | qsws_veg_eb(j,i) = 0.0_wp |
|---|
| 1337 | ENDIF |
|---|
| 1338 | ENDIF |
|---|
| 1339 | |
|---|
| 1340 | tend = - qsws_liq_eb(j,i) * drho_l_lv |
|---|
| 1341 | |
|---|
| 1342 | m_liq_eb_p(j,i) = m_liq_eb(j,i) + dt_3d * ( tsc(2) * tend & |
|---|
| 1343 | + tsc(3) * tm_liq_eb_m(j,i) ) |
|---|
| 1344 | |
|---|
| 1345 | ! |
|---|
| 1346 | !-- Check if reservoir is overfull -> reduce to maximum |
|---|
| 1347 | !-- (conservation of water is violated here) |
|---|
| 1348 | m_liq_eb_p(j,i) = MIN(m_liq_eb_p(j,i),m_liq_eb_max) |
|---|
| 1349 | |
|---|
| 1350 | ! |
|---|
| 1351 | !-- Check if reservoir is empty (avoid values < 0.0) |
|---|
| 1352 | !-- (conservation of water is violated here) |
|---|
| 1353 | m_liq_eb_p(j,i) = MAX(m_liq_eb_p(j,i),0.0_wp) |
|---|
| 1354 | |
|---|
| 1355 | |
|---|
| 1356 | ! |
|---|
| 1357 | !-- Calculate m_liq_eb tendencies for the next Runge-Kutta step |
|---|
| 1358 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
|---|
| 1359 | IF ( intermediate_timestep_count == 1 ) THEN |
|---|
| 1360 | tm_liq_eb_m(j,i) = tend |
|---|
| 1361 | ELSEIF ( intermediate_timestep_count < & |
|---|
| 1362 | intermediate_timestep_count_max ) THEN |
|---|
| 1363 | tm_liq_eb_m(j,i) = -9.5625_wp * tend + 5.3125_wp & |
|---|
| 1364 | * tm_liq_eb_m(j,i) |
|---|
| 1365 | ENDIF |
|---|
| 1366 | ENDIF |
|---|
| 1367 | |
|---|
| 1368 | ENDIF |
|---|
| 1369 | |
|---|
| 1370 | ENDDO |
|---|
| 1371 | ENDDO |
|---|
| 1372 | |
|---|
| 1373 | #if defined( __parallel ) |
|---|
| 1374 | ! |
|---|
| 1375 | !-- Make a logical OR for all processes. Force radiation call if at |
|---|
| 1376 | !-- least one processor |
|---|
| 1377 | IF ( intermediate_timestep_count == intermediate_timestep_count_max-1 )& |
|---|
| 1378 | THEN |
|---|
| 1379 | |
|---|
| 1380 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
|---|
| 1381 | CALL MPI_ALLREDUCE( force_radiation_call_l, force_radiation_call, & |
|---|
| 1382 | 1, MPI_LOGICAL, MPI_LOR, comm2d, ierr ) |
|---|
| 1383 | #else |
|---|
| 1384 | force_radiation_call = force_radiation_call_l |
|---|
| 1385 | #endif |
|---|
| 1386 | force_radiation_call_l = .FALSE. |
|---|
| 1387 | ENDIF |
|---|
| 1388 | |
|---|
| 1389 | |
|---|
| 1390 | END SUBROUTINE lsm_energy_balance |
|---|
| 1391 | |
|---|
| 1392 | |
|---|
| 1393 | !------------------------------------------------------------------------------! |
|---|
| 1394 | ! Description: |
|---|
| 1395 | ! ------------ |
|---|
| 1396 | !> Soil model as part of the land surface model. The model predicts soil |
|---|
| 1397 | !> temperature and water content. |
|---|
| 1398 | !------------------------------------------------------------------------------! |
|---|
| 1399 | SUBROUTINE lsm_soil_model |
|---|
| 1400 | |
|---|
| 1401 | |
|---|
| 1402 | IMPLICIT NONE |
|---|
| 1403 | |
|---|
| 1404 | INTEGER(iwp) :: i !< running index |
|---|
| 1405 | INTEGER(iwp) :: j !< running index |
|---|
| 1406 | INTEGER(iwp) :: k !< running index |
|---|
| 1407 | |
|---|
| 1408 | REAL(wp) :: h_vg !< Van Genuchten coef. h |
|---|
| 1409 | |
|---|
| 1410 | REAL(wp), DIMENSION(nzb_soil:nzt_soil) :: gamma_temp, & !< temp. gamma |
|---|
| 1411 | lambda_temp, & !< temp. lambda |
|---|
| 1412 | tend !< tendency |
|---|
| 1413 | |
|---|
| 1414 | DO i = nxlg, nxrg |
|---|
| 1415 | DO j = nysg, nyng |
|---|
| 1416 | DO k = nzb_soil, nzt_soil |
|---|
| 1417 | ! |
|---|
| 1418 | !-- Calculate volumetric heat capacity of the soil, taking into |
|---|
| 1419 | !-- account water content |
|---|
| 1420 | rho_c_total(k,j,i) = (rho_c_soil * (1.0_wp - m_sat(j,i)) & |
|---|
| 1421 | + rho_c_water * m_soil(k,j,i)) |
|---|
| 1422 | |
|---|
| 1423 | ! |
|---|
| 1424 | !-- Calculate soil heat conductivity at the center of the soil |
|---|
| 1425 | !-- layers |
|---|
| 1426 | lambda_h_sat = lambda_h_sm ** (1.0_wp - m_sat(j,i)) * & |
|---|
| 1427 | lambda_h_water ** m_soil(k,j,i) |
|---|
| 1428 | |
|---|
| 1429 | ke = 1.0_wp + LOG10(MAX(0.1_wp,m_soil(k,j,i) / m_sat(j,i))) |
|---|
| 1430 | |
|---|
| 1431 | lambda_temp(k) = ke * (lambda_h_sat - lambda_h_dry) + & |
|---|
| 1432 | lambda_h_dry |
|---|
| 1433 | |
|---|
| 1434 | ENDDO |
|---|
| 1435 | |
|---|
| 1436 | ! |
|---|
| 1437 | !-- Calculate soil heat conductivity (lambda_h) at the _stag level |
|---|
| 1438 | !-- using linear interpolation |
|---|
| 1439 | DO k = nzb_soil, nzt_soil-1 |
|---|
| 1440 | lambda_h(k,j,i) = ( lambda_temp(k+1) + lambda_temp(k) ) * 0.5_wp |
|---|
| 1441 | ENDDO |
|---|
| 1442 | lambda_h(nzt_soil,j,i) = lambda_temp(nzt_soil) |
|---|
| 1443 | |
|---|
| 1444 | ! |
|---|
| 1445 | !-- Prognostic equation for soil temperature t_soil |
|---|
| 1446 | tend(:) = 0.0_wp |
|---|
| 1447 | tend(nzb_soil) = (1.0_wp/rho_c_total(nzb_soil,j,i)) * & |
|---|
| 1448 | ( lambda_h(nzb_soil,j,i) * ( t_soil(nzb_soil+1,j,i) & |
|---|
| 1449 | - t_soil(nzb_soil,j,i) ) * ddz_soil(nzb_soil+1) & |
|---|
| 1450 | + ghf_eb(j,i) ) * ddz_soil_stag(nzb_soil) |
|---|
| 1451 | |
|---|
| 1452 | |
|---|
| 1453 | |
|---|
| 1454 | |
|---|
| 1455 | DO k = nzb_soil+1, nzt_soil |
|---|
| 1456 | tend(k) = (1.0_wp/rho_c_total(k,j,i)) & |
|---|
| 1457 | * ( lambda_h(k,j,i) & |
|---|
| 1458 | * ( t_soil(k+1,j,i) - t_soil(k,j,i) ) & |
|---|
| 1459 | * ddz_soil(k+1) & |
|---|
| 1460 | - lambda_h(k-1,j,i) & |
|---|
| 1461 | * ( t_soil(k,j,i) - t_soil(k-1,j,i) ) & |
|---|
| 1462 | * ddz_soil(k) & |
|---|
| 1463 | ) * ddz_soil_stag(k) |
|---|
| 1464 | ENDDO |
|---|
| 1465 | |
|---|
| 1466 | t_soil_p(nzb_soil:nzt_soil,j,i) = t_soil(nzb_soil:nzt_soil,j,i) & |
|---|
| 1467 | + dt_3d * ( tsc(2) & |
|---|
| 1468 | * tend(:) + tsc(3) & |
|---|
| 1469 | * tt_soil_m(:,j,i) ) |
|---|
| 1470 | |
|---|
| 1471 | ! |
|---|
| 1472 | !-- Calculate t_soil tendencies for the next Runge-Kutta step |
|---|
| 1473 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
|---|
| 1474 | IF ( intermediate_timestep_count == 1 ) THEN |
|---|
| 1475 | DO k = nzb_soil, nzt_soil |
|---|
| 1476 | tt_soil_m(k,j,i) = tend(k) |
|---|
| 1477 | ENDDO |
|---|
| 1478 | ELSEIF ( intermediate_timestep_count < & |
|---|
| 1479 | intermediate_timestep_count_max ) THEN |
|---|
| 1480 | DO k = nzb_soil, nzt_soil |
|---|
| 1481 | tt_soil_m(k,j,i) = -9.5625_wp * tend(k) + 5.3125_wp & |
|---|
| 1482 | * tt_soil_m(k,j,i) |
|---|
| 1483 | ENDDO |
|---|
| 1484 | ENDIF |
|---|
| 1485 | ENDIF |
|---|
| 1486 | |
|---|
| 1487 | |
|---|
| 1488 | DO k = nzb_soil, nzt_soil |
|---|
| 1489 | |
|---|
| 1490 | ! |
|---|
| 1491 | !-- Calculate soil diffusivity at the center of the soil layers |
|---|
| 1492 | lambda_temp(k) = (- b_ch * gamma_w_sat(j,i) * psi_sat & |
|---|
| 1493 | / m_sat(j,i) ) * ( MAX(m_soil(k,j,i), & |
|---|
| 1494 | m_wilt(j,i)) / m_sat(j,i) )**(b_ch + 2.0_wp) |
|---|
| 1495 | |
|---|
| 1496 | ! |
|---|
| 1497 | !-- Parametrization of Van Genuchten |
|---|
| 1498 | IF ( soil_type /= 7 ) THEN |
|---|
| 1499 | ! |
|---|
| 1500 | !-- Calculate the hydraulic conductivity after Van Genuchten |
|---|
| 1501 | !-- (1980) |
|---|
| 1502 | h_vg = ( ( (m_res(j,i) - m_sat(j,i)) / ( m_res(j,i) - & |
|---|
| 1503 | MAX(m_soil(k,j,i),m_wilt(j,i)) ) )**(n_vg(j,i) & |
|---|
| 1504 | / (n_vg(j,i)-1.0_wp)) - 1.0_wp & |
|---|
| 1505 | )**(1.0_wp/n_vg(j,i)) / alpha_vg(j,i) |
|---|
| 1506 | |
|---|
| 1507 | |
|---|
| 1508 | gamma_temp(k) = gamma_w_sat(j,i) * ( ( (1.0_wp + & |
|---|
| 1509 | (alpha_vg(j,i)*h_vg)**n_vg(j,i))**(1.0_wp & |
|---|
| 1510 | -1.0_wp/n_vg(j,i)) - (alpha_vg(j,i)*h_vg & |
|---|
| 1511 | )**(n_vg(j,i)-1.0_wp))**2 ) & |
|---|
| 1512 | / ( (1.0_wp + (alpha_vg(j,i)*h_vg & |
|---|
| 1513 | )**n_vg(j,i))**((1.0_wp - 1.0_wp/n_vg(j,i)) & |
|---|
| 1514 | *(l_vg(j,i) + 2.0_wp)) ) |
|---|
| 1515 | |
|---|
| 1516 | ! |
|---|
| 1517 | !-- Parametrization of Clapp & Hornberger |
|---|
| 1518 | ELSE |
|---|
| 1519 | gamma_temp(k) = gamma_w_sat(j,i) * (m_soil(k,j,i) & |
|---|
| 1520 | / m_sat(j,i) )**(2.0_wp * b_ch + 3.0_wp) |
|---|
| 1521 | ENDIF |
|---|
| 1522 | |
|---|
| 1523 | ENDDO |
|---|
| 1524 | |
|---|
| 1525 | |
|---|
| 1526 | IF ( humidity ) THEN |
|---|
| 1527 | ! |
|---|
| 1528 | !-- Calculate soil diffusivity (lambda_w) at the _stag level |
|---|
| 1529 | !-- using linear interpolation. To do: replace this with |
|---|
| 1530 | !-- ECMWF-IFS Eq. 8.81 |
|---|
| 1531 | DO k = nzb_soil, nzt_soil-1 |
|---|
| 1532 | |
|---|
| 1533 | lambda_w(k,j,i) = ( lambda_temp(k+1) + lambda_temp(k) ) & |
|---|
| 1534 | * 0.5_wp |
|---|
| 1535 | gamma_w(k,j,i) = ( gamma_temp(k+1) + gamma_temp(k) ) & |
|---|
| 1536 | * 0.5_wp |
|---|
| 1537 | |
|---|
| 1538 | ENDDO |
|---|
| 1539 | |
|---|
| 1540 | ! |
|---|
| 1541 | ! |
|---|
| 1542 | !-- In case of a closed bottom (= water content is conserved), set |
|---|
| 1543 | !-- hydraulic conductivity to zero to that no water will be lost |
|---|
| 1544 | !-- in the bottom layer. |
|---|
| 1545 | IF ( conserve_water_content ) THEN |
|---|
| 1546 | gamma_w(nzt_soil,j,i) = 0.0_wp |
|---|
| 1547 | ELSE |
|---|
| 1548 | gamma_w(nzt_soil,j,i) = gamma_temp(nzt_soil) |
|---|
| 1549 | ENDIF |
|---|
| 1550 | |
|---|
| 1551 | !-- The root extraction (= root_extr * qsws_veg_eb / (rho_l * l_v)) |
|---|
| 1552 | !-- ensures the mass conservation for water. The transpiration of |
|---|
| 1553 | !-- plants equals the cumulative withdrawals by the roots in the |
|---|
| 1554 | !-- soil. The scheme takes into account the availability of water |
|---|
| 1555 | !-- in the soil layers as well as the root fraction in the |
|---|
| 1556 | !-- respective layer. Layer with moisture below wilting point will |
|---|
| 1557 | !-- not contribute, which reflects the preference of plants to |
|---|
| 1558 | !-- take water from moister layers. |
|---|
| 1559 | |
|---|
| 1560 | ! |
|---|
| 1561 | !-- Calculate the root extraction (ECMWF 7.69, the sum of root_extr |
|---|
| 1562 | !-- = 1). The energy balance solver guarantees a positive |
|---|
| 1563 | !-- transpiration, so that there is no need for an additional check. |
|---|
| 1564 | DO k = nzb_soil, nzt_soil |
|---|
| 1565 | IF ( m_soil(k,j,i) > m_wilt(j,i) ) THEN |
|---|
| 1566 | m_total = m_total + root_fr(k,j,i) * m_soil(k,j,i) |
|---|
| 1567 | ENDIF |
|---|
| 1568 | ENDDO |
|---|
| 1569 | |
|---|
| 1570 | IF ( m_total > 0.0_wp ) THEN |
|---|
| 1571 | DO k = nzb_soil, nzt_soil |
|---|
| 1572 | IF ( m_soil(k,j,i) > m_wilt(j,i) ) THEN |
|---|
| 1573 | root_extr(k) = root_fr(k,j,i) * m_soil(k,j,i) / m_total |
|---|
| 1574 | ELSE |
|---|
| 1575 | root_extr(k) = 0.0_wp |
|---|
| 1576 | ENDIF |
|---|
| 1577 | ENDDO |
|---|
| 1578 | ENDIF |
|---|
| 1579 | |
|---|
| 1580 | ! |
|---|
| 1581 | !-- Prognostic equation for soil water content m_soil |
|---|
| 1582 | tend(:) = 0.0_wp |
|---|
| 1583 | tend(nzb_soil) = ( lambda_w(nzb_soil,j,i) * ( & |
|---|
| 1584 | m_soil(nzb_soil+1,j,i) - m_soil(nzb_soil,j,i) ) & |
|---|
| 1585 | * ddz_soil(nzb_soil+1) - gamma_w(nzb_soil,j,i) - ( & |
|---|
| 1586 | root_extr(nzb_soil) * qsws_veg_eb(j,i) & |
|---|
| 1587 | + qsws_soil_eb(j,i) ) * drho_l_lv ) & |
|---|
| 1588 | * ddz_soil_stag(nzb_soil) |
|---|
| 1589 | |
|---|
| 1590 | DO k = nzb_soil+1, nzt_soil-1 |
|---|
| 1591 | tend(k) = ( lambda_w(k,j,i) * ( m_soil(k+1,j,i) & |
|---|
| 1592 | - m_soil(k,j,i) ) * ddz_soil(k+1) - gamma_w(k,j,i)& |
|---|
| 1593 | - lambda_w(k-1,j,i) * (m_soil(k,j,i) - & |
|---|
| 1594 | m_soil(k-1,j,i)) * ddz_soil(k) & |
|---|
| 1595 | + gamma_w(k-1,j,i) - (root_extr(k) & |
|---|
| 1596 | * qsws_veg_eb(j,i) * drho_l_lv) & |
|---|
| 1597 | ) * ddz_soil_stag(k) |
|---|
| 1598 | |
|---|
| 1599 | ENDDO |
|---|
| 1600 | tend(nzt_soil) = ( - gamma_w(nzt_soil,j,i) & |
|---|
| 1601 | - lambda_w(nzt_soil-1,j,i) & |
|---|
| 1602 | * (m_soil(nzt_soil,j,i) & |
|---|
| 1603 | - m_soil(nzt_soil-1,j,i)) & |
|---|
| 1604 | * ddz_soil(nzt_soil) & |
|---|
| 1605 | + gamma_w(nzt_soil-1,j,i) - ( & |
|---|
| 1606 | root_extr(nzt_soil) & |
|---|
| 1607 | * qsws_veg_eb(j,i) * drho_l_lv ) & |
|---|
| 1608 | ) * ddz_soil_stag(nzt_soil) |
|---|
| 1609 | |
|---|
| 1610 | m_soil_p(nzb_soil:nzt_soil,j,i) = m_soil(nzb_soil:nzt_soil,j,i)& |
|---|
| 1611 | + dt_3d * ( tsc(2) * tend(:) & |
|---|
| 1612 | + tsc(3) * tm_soil_m(:,j,i) ) |
|---|
| 1613 | |
|---|
| 1614 | ! |
|---|
| 1615 | !-- Account for dry soils (find a better solution here!) |
|---|
| 1616 | m_soil_p(:,j,i) = MAX(m_soil_p(:,j,i),0.0_wp) |
|---|
| 1617 | |
|---|
| 1618 | ! |
|---|
| 1619 | !-- Calculate m_soil tendencies for the next Runge-Kutta step |
|---|
| 1620 | IF ( timestep_scheme(1:5) == 'runge' ) THEN |
|---|
| 1621 | IF ( intermediate_timestep_count == 1 ) THEN |
|---|
| 1622 | DO k = nzb_soil, nzt_soil |
|---|
| 1623 | tm_soil_m(k,j,i) = tend(k) |
|---|
| 1624 | ENDDO |
|---|
| 1625 | ELSEIF ( intermediate_timestep_count < & |
|---|
| 1626 | intermediate_timestep_count_max ) THEN |
|---|
| 1627 | DO k = nzb_soil, nzt_soil |
|---|
| 1628 | tm_soil_m(k,j,i) = -9.5625_wp * tend(k) + 5.3125_wp & |
|---|
| 1629 | * tm_soil_m(k,j,i) |
|---|
| 1630 | ENDDO |
|---|
| 1631 | ENDIF |
|---|
| 1632 | ENDIF |
|---|
| 1633 | |
|---|
| 1634 | ENDIF |
|---|
| 1635 | |
|---|
| 1636 | ENDDO |
|---|
| 1637 | ENDDO |
|---|
| 1638 | |
|---|
| 1639 | ! |
|---|
| 1640 | !-- Calculate surface specific humidity |
|---|
| 1641 | IF ( humidity ) THEN |
|---|
| 1642 | CALL calc_q_surface |
|---|
| 1643 | ENDIF |
|---|
| 1644 | |
|---|
| 1645 | |
|---|
| 1646 | END SUBROUTINE lsm_soil_model |
|---|
| 1647 | |
|---|
| 1648 | |
|---|
| 1649 | !------------------------------------------------------------------------------! |
|---|
| 1650 | ! Description: |
|---|
| 1651 | ! ------------ |
|---|
| 1652 | !> Calculation of specific humidity of the surface layer (surface) |
|---|
| 1653 | !------------------------------------------------------------------------------! |
|---|
| 1654 | SUBROUTINE calc_q_surface |
|---|
| 1655 | |
|---|
| 1656 | IMPLICIT NONE |
|---|
| 1657 | |
|---|
| 1658 | INTEGER :: i !< running index |
|---|
| 1659 | INTEGER :: j !< running index |
|---|
| 1660 | INTEGER :: k !< running index |
|---|
| 1661 | REAL(wp) :: resistance !< aerodynamic and soil resistance term |
|---|
| 1662 | |
|---|
| 1663 | DO i = nxlg, nxrg |
|---|
| 1664 | DO j = nysg, nyng |
|---|
| 1665 | k = nzb_s_inner(j,i) |
|---|
| 1666 | |
|---|
| 1667 | ! |
|---|
| 1668 | !-- Calculate water vapour pressure at saturation |
|---|
| 1669 | e_s = 0.01_wp * 610.78_wp * EXP( 17.269_wp * ( t_surface_p(j,i) & |
|---|
| 1670 | - 273.16_wp ) / ( t_surface_p(j,i) - 35.86_wp ) ) |
|---|
| 1671 | |
|---|
| 1672 | ! |
|---|
| 1673 | !-- Calculate specific humidity at saturation |
|---|
| 1674 | q_s = 0.622_wp * e_s / surface_pressure |
|---|
| 1675 | |
|---|
| 1676 | resistance = r_a(j,i) / (r_a(j,i) + r_s(j,i)) |
|---|
| 1677 | |
|---|
| 1678 | ! |
|---|
| 1679 | !-- Calculate specific humidity at surface |
|---|
| 1680 | IF ( cloud_physics ) THEN |
|---|
| 1681 | q(k,j,i) = resistance * q_s + (1.0_wp - resistance) & |
|---|
| 1682 | * ( q(k+1,j,i) - ql(k+1,j,i) ) |
|---|
| 1683 | ELSE |
|---|
| 1684 | q(k,j,i) = resistance * q_s + (1.0_wp - resistance) & |
|---|
| 1685 | * q(k+1,j,i) |
|---|
| 1686 | ENDIF |
|---|
| 1687 | |
|---|
| 1688 | ! |
|---|
| 1689 | !-- Update virtual potential temperature |
|---|
| 1690 | vpt(k,j,i) = pt(k,j,i) * ( 1.0_wp + 0.61_wp * q(k,j,i) ) |
|---|
| 1691 | |
|---|
| 1692 | ENDDO |
|---|
| 1693 | ENDDO |
|---|
| 1694 | |
|---|
| 1695 | END SUBROUTINE calc_q_surface |
|---|
| 1696 | |
|---|
| 1697 | !------------------------------------------------------------------------------! |
|---|
| 1698 | ! Description: |
|---|
| 1699 | ! ------------ |
|---|
| 1700 | !> Swapping of timelevels |
|---|
| 1701 | !------------------------------------------------------------------------------! |
|---|
| 1702 | SUBROUTINE lsm_swap_timelevel ( mod_count ) |
|---|
| 1703 | |
|---|
| 1704 | IMPLICIT NONE |
|---|
| 1705 | |
|---|
| 1706 | INTEGER, INTENT(IN) :: mod_count |
|---|
| 1707 | |
|---|
| 1708 | #if defined( __nopointer ) |
|---|
| 1709 | |
|---|
| 1710 | t_surface = t_surface_p |
|---|
| 1711 | t_soil = t_soil_p |
|---|
| 1712 | IF ( humidity ) THEN |
|---|
| 1713 | m_soil = m_soil_p |
|---|
| 1714 | m_liq_eb = m_liq_eb_p |
|---|
| 1715 | ENDIF |
|---|
| 1716 | |
|---|
| 1717 | #else |
|---|
| 1718 | |
|---|
| 1719 | SELECT CASE ( mod_count ) |
|---|
| 1720 | |
|---|
| 1721 | CASE ( 0 ) |
|---|
| 1722 | |
|---|
| 1723 | t_surface => t_surface_1; t_surface_p => t_surface_2 |
|---|
| 1724 | t_soil => t_soil_1; t_soil_p => t_soil_2 |
|---|
| 1725 | IF ( humidity ) THEN |
|---|
| 1726 | m_soil => m_soil_1; m_soil_p => m_soil_2 |
|---|
| 1727 | m_liq_eb => m_liq_eb_1; m_liq_eb_p => m_liq_eb_2 |
|---|
| 1728 | ENDIF |
|---|
| 1729 | |
|---|
| 1730 | |
|---|
| 1731 | CASE ( 1 ) |
|---|
| 1732 | |
|---|
| 1733 | t_surface => t_surface_2; t_surface_p => t_surface_1 |
|---|
| 1734 | t_soil => t_soil_2; t_soil_p => t_soil_1 |
|---|
| 1735 | IF ( humidity ) THEN |
|---|
| 1736 | m_soil => m_soil_2; m_soil_p => m_soil_1 |
|---|
| 1737 | m_liq_eb => m_liq_eb_2; m_liq_eb_p => m_liq_eb_1 |
|---|
| 1738 | ENDIF |
|---|
| 1739 | |
|---|
| 1740 | END SELECT |
|---|
| 1741 | #endif |
|---|
| 1742 | |
|---|
| 1743 | END SUBROUTINE lsm_swap_timelevel |
|---|
| 1744 | |
|---|
| 1745 | |
|---|
| 1746 | END MODULE land_surface_model_mod |
|---|
