| 1 | !> @file calc_radiation.f90 |
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| 2 | !------------------------------------------------------------------------------! |
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| 3 | ! This file is part of the PALM model system. |
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| 4 | ! |
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| 5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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| 6 | ! terms of the GNU General Public License as published by the Free Software |
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| 7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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| 8 | ! version. |
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| 9 | ! |
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| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 13 | ! |
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| 14 | ! You should have received a copy of the GNU General Public License along with |
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| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 16 | ! |
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| 17 | ! Copyright 1997-2018 Leibniz Universitaet Hannover |
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| 18 | !------------------------------------------------------------------------------! |
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| 19 | ! |
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| 20 | ! Current revisions: |
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| 21 | ! ----------------- |
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| 22 | ! |
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| 23 | ! |
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| 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: calc_radiation.f90 3274 2018-09-24 15:42:55Z knoop $ |
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| 27 | ! Modularization of all bulk cloud physics code components |
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| 28 | ! |
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| 29 | ! 2718 2018-01-02 08:49:38Z maronga |
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| 30 | ! Corrected "Former revisions" section |
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| 31 | ! |
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| 32 | ! 2696 2017-12-14 17:12:51Z kanani |
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| 33 | ! Change in file header (GPL part) |
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| 34 | ! |
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| 35 | ! 2233 2017-05-30 18:08:54Z suehring |
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| 36 | ! |
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| 37 | ! 2232 2017-05-30 17:47:52Z suehring |
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| 38 | ! Adjustments to new topography concept |
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| 39 | ! |
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| 40 | ! 2000 2016-08-20 18:09:15Z knoop |
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| 41 | ! Forced header and separation lines into 80 columns |
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| 42 | ! |
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| 43 | ! 1873 2016-04-18 14:50:06Z maronga |
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| 44 | ! Module renamed (removed _mod) |
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| 45 | ! |
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| 46 | ! |
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| 47 | ! 1850 2016-04-08 13:29:27Z maronga |
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| 48 | ! Module renamed |
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| 49 | ! |
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| 50 | ! |
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| 51 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 52 | ! Code annotations made doxygen readable |
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| 53 | ! |
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| 54 | ! 1353 2014-04-08 15:21:23Z heinze |
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| 55 | ! REAL constants provided with KIND-attribute |
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| 56 | ! |
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| 57 | ! 1322 2014-03-20 16:38:49Z raasch |
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| 58 | ! exponent 4.0 changed to integer |
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| 59 | ! |
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| 60 | ! 1320 2014-03-20 08:40:49Z raasch |
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| 61 | ! ONLY-attribute added to USE-statements, |
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| 62 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 63 | ! kinds are defined in new module kinds, |
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| 64 | ! revision history before 2012 removed, |
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| 65 | ! comment fields (!:) to be used for variable explanations added to |
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| 66 | ! all variable declaration statements |
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| 67 | ! |
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| 68 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 69 | ! code put under GPL (PALM 3.9) |
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| 70 | ! |
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| 71 | ! Revision 1.1 2000/04/13 14:42:45 schroeter |
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| 72 | ! Initial revision |
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| 73 | ! |
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| 74 | ! |
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| 75 | ! Description: |
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| 76 | ! ------------- |
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| 77 | !> Calculation of the vertical divergences of the long-wave radiation-fluxes |
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| 78 | !> based on the parameterization of the cloud effective emissivity |
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| 79 | !------------------------------------------------------------------------------! |
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| 80 | MODULE calc_radiation_mod |
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| 81 | |
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| 82 | |
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| 83 | USE arrays_3d, & |
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| 84 | ONLY: dzw, pt, ql, tend, d_exner, exner |
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| 85 | |
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| 86 | USE basic_constants_and_equations_mod, & |
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| 87 | ONLY: c_p, lv_d_cp, sigma_sb |
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| 88 | |
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| 89 | USE control_parameters, & |
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| 90 | ONLY: rho_surface |
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| 91 | |
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| 92 | USE indices, & |
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| 93 | ONLY: nxl, nxr, nyn, nys, nzb, nzt, wall_flags_0 |
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| 94 | |
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| 95 | USE kinds |
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| 96 | |
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| 97 | USE pegrid |
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| 98 | |
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| 99 | PRIVATE |
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| 100 | PUBLIC calc_radiation |
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| 101 | |
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| 102 | LOGICAL, SAVE :: first_call = .TRUE. !< |
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| 103 | |
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| 104 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground !< |
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| 105 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_top !< |
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| 106 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: blackbody_emission !< |
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| 107 | |
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| 108 | INTERFACE calc_radiation |
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| 109 | MODULE PROCEDURE calc_radiation |
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| 110 | MODULE PROCEDURE calc_radiation_ij |
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| 111 | END INTERFACE calc_radiation |
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| 112 | |
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| 113 | CONTAINS |
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| 114 | |
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| 115 | |
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| 116 | !------------------------------------------------------------------------------! |
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| 117 | ! Description: |
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| 118 | ! ------------ |
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| 119 | !> Call for all grid points |
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| 120 | !------------------------------------------------------------------------------! |
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| 121 | SUBROUTINE calc_radiation |
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| 122 | |
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| 123 | IMPLICIT NONE |
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| 124 | |
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| 125 | INTEGER(iwp) :: i !< |
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| 126 | INTEGER(iwp) :: j !< |
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| 127 | INTEGER(iwp) :: k !< |
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| 128 | INTEGER(iwp) :: k_help !< |
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| 129 | |
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| 130 | REAL(wp) :: df_p !< |
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| 131 | REAL(wp) :: df_m !< |
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| 132 | REAL(wp) :: effective_emission_up_m !< |
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| 133 | REAL(wp) :: effective_emission_up_p !< |
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| 134 | REAL(wp) :: effective_emission_down_m !< |
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| 135 | REAL(wp) :: effective_emission_down_p !< |
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| 136 | REAL(wp) :: f_up_m !< |
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| 137 | REAL(wp) :: f_up_p !< |
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| 138 | REAL(wp) :: f_down_m !< |
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| 139 | REAL(wp) :: f_down_p !< |
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| 140 | REAL(wp) :: impinging_flux_at_top !< |
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| 141 | REAL(wp) :: temperature !< |
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| 142 | |
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| 143 | |
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| 144 | ! |
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| 145 | !-- On first call, allocate temporary arrays |
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| 146 | IF ( first_call ) THEN |
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| 147 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 148 | lwp_top(nzb:nzt+1) ) |
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| 149 | first_call = .FALSE. |
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| 150 | ENDIF |
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| 151 | |
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| 152 | |
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| 153 | DO i = nxl, nxr |
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| 154 | DO j = nys, nyn |
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| 155 | ! |
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| 156 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 157 | !-- at all vertical levels |
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| 158 | lwp_ground(nzb) = 0.0_wp |
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| 159 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 160 | |
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| 161 | temperature = pt(nzb,j,i) * exner(nzb) + lv_d_cp * ql(nzb,j,i) |
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| 162 | blackbody_emission(nzb) = sigma_sb * temperature**4 |
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| 163 | |
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| 164 | DO k = nzb+1, nzt |
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| 165 | |
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| 166 | k_help = ( nzt+nzb+1 ) - k |
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| 167 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * & |
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| 168 | dzw(k) |
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| 169 | |
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| 170 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 171 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 172 | |
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| 173 | temperature = pt(k,j,i) * exner(k) + lv_d_cp * ql(k,j,i) |
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| 174 | blackbody_emission(k) = sigma_sb * temperature**4 & |
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| 175 | * MERGE( 1.0_wp, 0.0_wp, & |
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| 176 | BTEST( wall_flags_0(k,j,i), 0 ) ) |
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| 177 | |
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| 178 | ENDDO |
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| 179 | |
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| 180 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 181 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 182 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 183 | |
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| 184 | temperature = pt(nzt+1,j,i) * exner(nzt+1) + lv_d_cp * & |
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| 185 | ql(nzt+1,j,i) |
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| 186 | blackbody_emission(nzt+1) = sigma_sb * temperature**4 |
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| 187 | |
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| 188 | ! |
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| 189 | !-- See Chlond '92, this is just a first guess |
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| 190 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp |
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| 191 | |
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| 192 | DO k = nzb+1, nzt |
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| 193 | ! |
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| 194 | !-- Save some computational time, but this may cause load |
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| 195 | !-- imbalances if ql is not distributed uniformly |
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| 196 | IF ( ql(k,j,i) /= 0.0_wp ) THEN |
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| 197 | ! |
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| 198 | !-- Compute effective emissivities |
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| 199 | effective_emission_up_p = 1.0_wp - & |
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| 200 | EXP( -130.0_wp * lwp_ground(k+1) ) |
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| 201 | effective_emission_up_m = 1.0_wp - & |
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| 202 | EXP( -130.0_wp * lwp_ground(k-1) ) |
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| 203 | effective_emission_down_p = 1.0_wp - & |
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| 204 | EXP( -158.0_wp * lwp_top(k+1) ) |
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| 205 | effective_emission_down_m = 1.0_wp - & |
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| 206 | EXP( -158.0_wp * lwp_top(k-1) ) |
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| 207 | |
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| 208 | ! |
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| 209 | !-- Compute vertical long wave radiation fluxes |
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| 210 | f_up_p = blackbody_emission(nzb) + & |
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| 211 | effective_emission_up_p * & |
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| 212 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 213 | |
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| 214 | f_up_m = blackbody_emission(nzb) + & |
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| 215 | effective_emission_up_m * & |
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| 216 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 217 | |
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| 218 | f_down_p = impinging_flux_at_top + & |
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| 219 | effective_emission_down_p * & |
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| 220 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 221 | |
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| 222 | f_down_m = impinging_flux_at_top + & |
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| 223 | effective_emission_down_m * & |
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| 224 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 225 | |
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| 226 | ! |
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| 227 | !-- Divergence of vertical long wave radiation fluxes |
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| 228 | df_p = f_up_p - f_down_p |
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| 229 | df_m = f_up_m - f_down_m |
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| 230 | |
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| 231 | ! |
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| 232 | !-- Compute tendency term |
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| 233 | tend(k,j,i) = tend(k,j,i) - & |
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| 234 | ( d_exner(k) / ( rho_surface * c_p ) * & |
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| 235 | ( df_p - df_m ) / dzw(k) ) & |
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| 236 | * MERGE( 1.0_wp, 0.0_wp, & |
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| 237 | BTEST( wall_flags_0(k,j,i), 0 ) ) |
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| 238 | |
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| 239 | ENDIF |
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| 240 | |
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| 241 | ENDDO |
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| 242 | ENDDO |
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| 243 | ENDDO |
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| 244 | |
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| 245 | END SUBROUTINE calc_radiation |
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| 246 | |
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| 247 | |
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| 248 | !------------------------------------------------------------------------------! |
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| 249 | ! Description: |
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| 250 | ! ------------ |
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| 251 | !> Call for grid point i,j |
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| 252 | !------------------------------------------------------------------------------! |
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| 253 | SUBROUTINE calc_radiation_ij( i, j ) |
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| 254 | |
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| 255 | IMPLICIT NONE |
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| 256 | |
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| 257 | INTEGER(iwp) :: i !< |
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| 258 | INTEGER(iwp) :: j !< |
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| 259 | INTEGER(iwp) :: k !< |
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| 260 | INTEGER(iwp) :: k_help !< |
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| 261 | |
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| 262 | REAL(wp) :: df_p !< |
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| 263 | REAL(wp) :: df_m !< |
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| 264 | REAL(wp) :: effective_emission_up_m !< |
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| 265 | REAL(wp) :: effective_emission_up_p !< |
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| 266 | REAL(wp) :: effective_emission_down_m !< |
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| 267 | REAL(wp) :: effective_emission_down_p !< |
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| 268 | REAL(wp) :: f_up_m !< |
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| 269 | REAL(wp) :: f_up_p !< |
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| 270 | REAL(wp) :: f_down_m !< |
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| 271 | REAL(wp) :: f_down_p !< |
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| 272 | REAL(wp) :: impinging_flux_at_top !< |
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| 273 | REAL(wp) :: temperature !< |
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| 274 | |
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| 275 | |
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| 276 | ! |
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| 277 | !-- On first call, allocate temporary arrays |
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| 278 | IF ( first_call ) THEN |
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| 279 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 280 | lwp_top(nzb:nzt+1) ) |
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| 281 | first_call = .FALSE. |
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| 282 | ENDIF |
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| 283 | |
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| 284 | ! |
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| 285 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 286 | !-- at all vertical levels |
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| 287 | lwp_ground(nzb) = 0.0_wp |
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| 288 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 289 | |
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| 290 | temperature = pt(nzb,j,i) * exner(nzb) + lv_d_cp * ql(nzb,j,i) |
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| 291 | blackbody_emission(nzb) = sigma_sb * temperature**4 |
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| 292 | |
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| 293 | DO k = nzb+1, nzt |
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| 294 | k_help = ( nzt+nzb+1 ) - k |
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| 295 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k) |
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| 296 | |
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| 297 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 298 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 299 | |
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| 300 | temperature = pt(k,j,i) * exner(k) + lv_d_cp * ql(k,j,i) |
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| 301 | blackbody_emission(k) = sigma_sb * temperature**4 & |
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| 302 | * MERGE( 1.0_wp, 0.0_wp, & |
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| 303 | BTEST( wall_flags_0(k,j,i), 0 ) ) |
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| 304 | |
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| 305 | ENDDO |
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| 306 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 307 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 308 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 309 | |
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| 310 | temperature = pt(nzt+1,j,i) * exner(nzt+1) + lv_d_cp * & |
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| 311 | ql(nzt+1,j,i) |
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| 312 | blackbody_emission(nzt+1) = sigma_sb * temperature**4 |
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| 313 | |
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| 314 | ! |
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| 315 | !-- See Chlond '92, this is just a first guess |
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| 316 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp |
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| 317 | |
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| 318 | DO k = nzb+1, nzt |
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| 319 | ! |
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| 320 | !-- Store some computational time, |
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| 321 | !-- this may cause load imbalances if ql is not distributed uniformly |
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| 322 | IF ( ql(k,j,i) /= 0.0_wp ) THEN |
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| 323 | ! |
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| 324 | !-- Compute effective emissivities |
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| 325 | effective_emission_up_p = 1.0_wp - & |
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| 326 | EXP( -130.0_wp * lwp_ground(k+1) ) |
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| 327 | effective_emission_up_m = 1.0_wp - & |
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| 328 | EXP( -130.0_wp * lwp_ground(k-1) ) |
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| 329 | effective_emission_down_p = 1.0_wp - & |
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| 330 | EXP( -158.0_wp * lwp_top(k+1) ) |
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| 331 | effective_emission_down_m = 1.0_wp - & |
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| 332 | EXP( -158.0_wp * lwp_top(k-1) ) |
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| 333 | |
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| 334 | ! |
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| 335 | !-- Compute vertical long wave radiation fluxes |
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| 336 | f_up_p = blackbody_emission(nzb) + effective_emission_up_p * & |
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| 337 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 338 | |
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| 339 | f_up_m = blackbody_emission(nzb) + effective_emission_up_m * & |
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| 340 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 341 | |
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| 342 | f_down_p = impinging_flux_at_top + effective_emission_down_p * & |
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| 343 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 344 | |
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| 345 | f_down_m = impinging_flux_at_top + effective_emission_down_m * & |
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| 346 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 347 | |
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| 348 | ! |
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| 349 | !- Divergence of vertical long wave radiation fluxes |
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| 350 | df_p = f_up_p - f_down_p |
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| 351 | df_m = f_up_m - f_down_m |
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| 352 | |
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| 353 | ! |
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| 354 | !-- Compute tendency term |
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| 355 | tend(k,j,i) = tend(k,j,i) - ( d_exner(k) / ( rho_surface * c_p ) & |
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| 356 | * ( df_p - df_m ) / dzw(k) ) & |
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| 357 | * MERGE( 1.0_wp, 0.0_wp, & |
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| 358 | BTEST( wall_flags_0(k,j,i), 0 ) ) |
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| 359 | |
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| 360 | ENDIF |
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| 361 | |
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| 362 | ENDDO |
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| 363 | |
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| 364 | END SUBROUTINE calc_radiation_ij |
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| 365 | |
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| 366 | END MODULE calc_radiation_mod |
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