| 1 | !> @file calc_radiation.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 1997-2016 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 | ! |
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| 22 | ! |
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| 23 | ! Former revisions: |
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| 24 | ! ----------------- |
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| 25 | ! $Id: calc_radiation.f90 1818 2016-04-06 15:53:27Z gronemeier $ |
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| 26 | ! |
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| 27 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 28 | ! Code annotations made doxygen readable |
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| 29 | ! |
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| 30 | ! 1353 2014-04-08 15:21:23Z heinze |
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| 31 | ! REAL constants provided with KIND-attribute |
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| 32 | ! |
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| 33 | ! 1322 2014-03-20 16:38:49Z raasch |
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| 34 | ! exponent 4.0 changed to integer |
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| 35 | ! |
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| 36 | ! 1320 2014-03-20 08:40:49Z raasch |
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| 37 | ! ONLY-attribute added to USE-statements, |
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| 38 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 39 | ! kinds are defined in new module kinds, |
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| 40 | ! revision history before 2012 removed, |
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| 41 | ! comment fields (!:) to be used for variable explanations added to |
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| 42 | ! all variable declaration statements |
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| 43 | ! |
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| 44 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 45 | ! code put under GPL (PALM 3.9) |
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| 46 | ! |
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| 47 | ! Revision 1.1 2000/04/13 14:42:45 schroeter |
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| 48 | ! Initial revision |
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| 49 | ! |
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| 50 | ! |
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| 51 | ! Description: |
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| 52 | ! ------------- |
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| 53 | !> Calculation of the vertical divergences of the long-wave radiation-fluxes |
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| 54 | !> based on the parameterization of the cloud effective emissivity |
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| 55 | !------------------------------------------------------------------------------! |
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| 56 | MODULE calc_radiation_mod |
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| 57 | |
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| 58 | USE kinds |
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| 59 | |
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| 60 | PRIVATE |
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| 61 | PUBLIC calc_radiation |
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| 62 | |
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| 63 | LOGICAL, SAVE :: first_call = .TRUE. !< |
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| 64 | REAL(wp), SAVE :: sigma = 5.67E-08_wp !< |
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| 65 | |
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| 66 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground !< |
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| 67 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_top !< |
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| 68 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: blackbody_emission !< |
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| 69 | |
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| 70 | INTERFACE calc_radiation |
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| 71 | MODULE PROCEDURE calc_radiation |
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| 72 | MODULE PROCEDURE calc_radiation_ij |
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| 73 | END INTERFACE calc_radiation |
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| 74 | |
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| 75 | CONTAINS |
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| 76 | |
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| 77 | |
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| 78 | !------------------------------------------------------------------------------! |
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| 79 | ! Description: |
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| 80 | ! ------------ |
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| 81 | !> Call for all grid points |
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| 82 | !------------------------------------------------------------------------------! |
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| 83 | SUBROUTINE calc_radiation |
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| 84 | |
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| 85 | USE arrays_3d, & |
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| 86 | ONLY: dzw, pt, ql, tend |
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| 87 | |
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| 88 | USE cloud_parameters, & |
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| 89 | ONLY: cp, l_d_cp, pt_d_t, t_d_pt |
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| 90 | |
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| 91 | USE control_parameters, & |
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| 92 | ONLY: rho_surface |
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| 93 | |
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| 94 | USE indices, & |
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| 95 | ONLY: nxl, nxr, nyn, nys, nzb, nzb_2d, nzt |
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| 96 | |
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| 97 | USE kinds |
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| 98 | |
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| 99 | USE pegrid |
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| 100 | |
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| 101 | |
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| 102 | IMPLICIT NONE |
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| 103 | |
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| 104 | INTEGER(iwp) :: i !< |
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| 105 | INTEGER(iwp) :: j !< |
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| 106 | INTEGER(iwp) :: k !< |
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| 107 | INTEGER(iwp) :: k_help !< |
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| 108 | |
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| 109 | REAL(wp) :: df_p !< |
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| 110 | REAL(wp) :: df_m !< |
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| 111 | REAL(wp) :: effective_emission_up_m !< |
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| 112 | REAL(wp) :: effective_emission_up_p !< |
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| 113 | REAL(wp) :: effective_emission_down_m !< |
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| 114 | REAL(wp) :: effective_emission_down_p !< |
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| 115 | REAL(wp) :: f_up_m !< |
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| 116 | REAL(wp) :: f_up_p !< |
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| 117 | REAL(wp) :: f_down_m !< |
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| 118 | REAL(wp) :: f_down_p !< |
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| 119 | REAL(wp) :: impinging_flux_at_top !< |
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| 120 | REAL(wp) :: temperature !< |
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| 121 | |
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| 122 | |
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| 123 | ! |
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| 124 | !-- On first call, allocate temporary arrays |
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| 125 | IF ( first_call ) THEN |
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| 126 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 127 | lwp_top(nzb:nzt+1) ) |
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| 128 | first_call = .FALSE. |
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| 129 | ENDIF |
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| 130 | |
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| 131 | |
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| 132 | DO i = nxl, nxr |
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| 133 | DO j = nys, nyn |
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| 134 | ! |
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| 135 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 136 | !-- at all vertical levels |
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| 137 | lwp_ground(nzb) = 0.0_wp |
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| 138 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 139 | |
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| 140 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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| 141 | blackbody_emission(nzb) = sigma * temperature**4 |
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| 142 | |
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| 143 | DO k = nzb_2d(j,i)+1, nzt |
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| 144 | |
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| 145 | k_help = ( nzt+nzb+1 ) - k |
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| 146 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * & |
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| 147 | dzw(k) |
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| 148 | |
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| 149 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 150 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 151 | |
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| 152 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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| 153 | blackbody_emission(k) = sigma * temperature**4 |
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| 154 | |
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| 155 | ENDDO |
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| 156 | |
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| 157 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 158 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 159 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 160 | |
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| 161 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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| 162 | ql(nzt+1,j,i) |
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| 163 | blackbody_emission(nzt+1) = sigma * temperature**4 |
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| 164 | |
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| 165 | ! |
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| 166 | !-- See Chlond '92, this is just a first guess |
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| 167 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp |
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| 168 | |
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| 169 | DO k = nzb_2d(j,i)+1, nzt |
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| 170 | ! |
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| 171 | !-- Save some computational time, but this may cause load |
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| 172 | !-- imbalances if ql is not distributed uniformly |
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| 173 | IF ( ql(k,j,i) /= 0.0_wp ) THEN |
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| 174 | ! |
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| 175 | !-- Compute effective emissivities |
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| 176 | effective_emission_up_p = 1.0_wp - & |
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| 177 | EXP( -130.0_wp * lwp_ground(k+1) ) |
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| 178 | effective_emission_up_m = 1.0_wp - & |
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| 179 | EXP( -130.0_wp * lwp_ground(k-1) ) |
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| 180 | effective_emission_down_p = 1.0_wp - & |
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| 181 | EXP( -158.0_wp * lwp_top(k+1) ) |
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| 182 | effective_emission_down_m = 1.0_wp - & |
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| 183 | EXP( -158.0_wp * lwp_top(k-1) ) |
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| 184 | |
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| 185 | ! |
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| 186 | !-- Compute vertical long wave radiation fluxes |
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| 187 | f_up_p = blackbody_emission(nzb) + & |
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| 188 | effective_emission_up_p * & |
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| 189 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 190 | |
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| 191 | f_up_m = blackbody_emission(nzb) + & |
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| 192 | effective_emission_up_m * & |
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| 193 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 194 | |
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| 195 | f_down_p = impinging_flux_at_top + & |
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| 196 | effective_emission_down_p * & |
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| 197 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 198 | |
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| 199 | f_down_m = impinging_flux_at_top + & |
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| 200 | effective_emission_down_m * & |
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| 201 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 202 | |
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| 203 | ! |
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| 204 | !-- Divergence of vertical long wave radiation fluxes |
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| 205 | df_p = f_up_p - f_down_p |
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| 206 | df_m = f_up_m - f_down_m |
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| 207 | |
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| 208 | ! |
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| 209 | !-- Compute tendency term |
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| 210 | tend(k,j,i) = tend(k,j,i) - & |
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| 211 | ( pt_d_t(k) / ( rho_surface * cp ) * & |
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| 212 | ( df_p - df_m ) / dzw(k) ) |
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| 213 | |
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| 214 | ENDIF |
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| 215 | |
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| 216 | ENDDO |
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| 217 | ENDDO |
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| 218 | ENDDO |
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| 219 | |
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| 220 | END SUBROUTINE calc_radiation |
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| 221 | |
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| 222 | |
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| 223 | !------------------------------------------------------------------------------! |
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| 224 | ! Description: |
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| 225 | ! ------------ |
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| 226 | !> Call for grid point i,j |
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| 227 | !------------------------------------------------------------------------------! |
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| 228 | SUBROUTINE calc_radiation_ij( i, j ) |
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| 229 | |
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| 230 | USE arrays_3d, & |
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| 231 | ONLY: dzw, pt, ql, tend |
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| 232 | |
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| 233 | USE cloud_parameters, & |
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| 234 | ONLY: cp, l_d_cp, pt_d_t, t_d_pt |
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| 235 | |
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| 236 | USE control_parameters, & |
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| 237 | ONLY: rho_surface |
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| 238 | |
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| 239 | USE indices, & |
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| 240 | ONLY: nzb, nzb_2d, nzt |
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| 241 | |
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| 242 | USE kinds |
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| 243 | |
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| 244 | USE pegrid |
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| 245 | |
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| 246 | |
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| 247 | IMPLICIT NONE |
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| 248 | |
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| 249 | INTEGER(iwp) :: i !< |
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| 250 | INTEGER(iwp) :: j !< |
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| 251 | INTEGER(iwp) :: k !< |
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| 252 | INTEGER(iwp) :: k_help !< |
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| 253 | |
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| 254 | REAL(wp) :: df_p !< |
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| 255 | REAL(wp) :: df_m !< |
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| 256 | REAL(wp) :: effective_emission_up_m !< |
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| 257 | REAL(wp) :: effective_emission_up_p !< |
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| 258 | REAL(wp) :: effective_emission_down_m !< |
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| 259 | REAL(wp) :: effective_emission_down_p !< |
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| 260 | REAL(wp) :: f_up_m !< |
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| 261 | REAL(wp) :: f_up_p !< |
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| 262 | REAL(wp) :: f_down_m !< |
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| 263 | REAL(wp) :: f_down_p !< |
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| 264 | REAL(wp) :: impinging_flux_at_top !< |
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| 265 | REAL(wp) :: temperature !< |
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| 266 | |
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| 267 | |
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| 268 | ! |
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| 269 | !-- On first call, allocate temporary arrays |
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| 270 | IF ( first_call ) THEN |
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| 271 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 272 | lwp_top(nzb:nzt+1) ) |
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| 273 | first_call = .FALSE. |
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| 274 | ENDIF |
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| 275 | |
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| 276 | ! |
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| 277 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 278 | !-- at all vertical levels |
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| 279 | lwp_ground(nzb) = 0.0_wp |
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| 280 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 281 | |
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| 282 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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| 283 | blackbody_emission(nzb) = sigma * temperature**4 |
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| 284 | |
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| 285 | DO k = nzb_2d(j,i)+1, nzt |
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| 286 | k_help = ( nzt+nzb+1 ) - k |
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| 287 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k) |
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| 288 | |
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| 289 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 290 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 291 | |
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| 292 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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| 293 | blackbody_emission(k) = sigma * temperature**4 |
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| 294 | |
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| 295 | ENDDO |
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| 296 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 297 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 298 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 299 | |
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| 300 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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| 301 | ql(nzt+1,j,i) |
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| 302 | blackbody_emission(nzt+1) = sigma * temperature**4 |
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| 303 | |
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| 304 | ! |
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| 305 | !-- See Chlond '92, this is just a first guess |
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| 306 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp |
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| 307 | |
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| 308 | DO k = nzb_2d(j,i)+1, nzt |
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| 309 | ! |
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| 310 | !-- Store some computational time, |
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| 311 | !-- this may cause load imbalances if ql is not distributed uniformly |
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| 312 | IF ( ql(k,j,i) /= 0.0_wp ) THEN |
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| 313 | ! |
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| 314 | !-- Compute effective emissivities |
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| 315 | effective_emission_up_p = 1.0_wp - & |
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| 316 | EXP( -130.0_wp * lwp_ground(k+1) ) |
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| 317 | effective_emission_up_m = 1.0_wp - & |
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| 318 | EXP( -130.0_wp * lwp_ground(k-1) ) |
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| 319 | effective_emission_down_p = 1.0_wp - & |
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| 320 | EXP( -158.0_wp * lwp_top(k+1) ) |
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| 321 | effective_emission_down_m = 1.0_wp - & |
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| 322 | EXP( -158.0_wp * lwp_top(k-1) ) |
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| 323 | |
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| 324 | ! |
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| 325 | !-- Compute vertical long wave radiation fluxes |
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| 326 | f_up_p = blackbody_emission(nzb) + effective_emission_up_p * & |
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| 327 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 328 | |
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| 329 | f_up_m = blackbody_emission(nzb) + effective_emission_up_m * & |
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| 330 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 331 | |
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| 332 | f_down_p = impinging_flux_at_top + effective_emission_down_p * & |
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| 333 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 334 | |
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| 335 | f_down_m = impinging_flux_at_top + effective_emission_down_m * & |
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| 336 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 337 | |
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| 338 | ! |
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| 339 | !- Divergence of vertical long wave radiation fluxes |
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| 340 | df_p = f_up_p - f_down_p |
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| 341 | df_m = f_up_m - f_down_m |
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| 342 | |
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| 343 | ! |
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| 344 | !-- Compute tendency term |
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| 345 | tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * & |
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| 346 | ( df_p - df_m ) / dzw(k) ) |
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| 347 | |
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| 348 | ENDIF |
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| 349 | |
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| 350 | ENDDO |
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| 351 | |
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| 352 | END SUBROUTINE calc_radiation_ij |
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| 353 | |
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| 354 | END MODULE calc_radiation_mod |
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