| 1 | MODULE calc_radiation_mod |
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| 2 | |
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| 3 | !--------------------------------------------------------------------------------! |
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| 4 | ! This file is part of PALM. |
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| 5 | ! |
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| 6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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| 7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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| 8 | ! either version 3 of the License, or (at your option) any later 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 1997-2014 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 | ! ONLY-attribute added to USE-statements, |
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| 23 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 24 | ! kinds are defined in new module kinds, |
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| 25 | ! revision history before 2012 removed, |
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| 26 | ! comment fields (!:) to be used for variable explanations added to |
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| 27 | ! all variable declaration statements |
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| 28 | ! |
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| 29 | ! Former revisions: |
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| 30 | ! ----------------- |
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| 31 | ! $Id: calc_radiation.f90 1320 2014-03-20 08:40:49Z raasch $ |
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| 32 | ! |
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| 33 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 34 | ! code put under GPL (PALM 3.9) |
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| 35 | ! |
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| 36 | ! Revision 1.1 2000/04/13 14:42:45 schroeter |
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| 37 | ! Initial revision |
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| 38 | ! |
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| 39 | ! |
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| 40 | ! Description: |
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| 41 | ! ------------- |
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| 42 | ! Calculation of the vertical divergences of the long-wave radiation-fluxes |
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| 43 | ! based on the parameterization of the cloud effective emissivity |
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| 44 | !------------------------------------------------------------------------------! |
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| 45 | USE kinds |
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| 46 | |
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| 47 | PRIVATE |
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| 48 | PUBLIC calc_radiation |
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| 49 | |
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| 50 | LOGICAL, SAVE :: first_call = .TRUE. !: |
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| 51 | REAL(wp), SAVE :: sigma = 5.67E-08 !: |
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| 52 | |
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| 53 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground !: |
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| 54 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_top !: |
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| 55 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: blackbody_emission !: |
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| 56 | |
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| 57 | INTERFACE calc_radiation |
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| 58 | MODULE PROCEDURE calc_radiation |
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| 59 | MODULE PROCEDURE calc_radiation_ij |
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| 60 | END INTERFACE calc_radiation |
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| 61 | |
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| 62 | CONTAINS |
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| 63 | |
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| 64 | |
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| 65 | !------------------------------------------------------------------------------! |
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| 66 | ! Call for all grid points |
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| 67 | !------------------------------------------------------------------------------! |
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| 68 | SUBROUTINE calc_radiation |
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| 69 | |
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| 70 | USE arrays_3d, & |
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| 71 | ONLY: dzw, pt, ql, tend |
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| 72 | |
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| 73 | USE cloud_parameters, & |
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| 74 | ONLY: cp, l_d_cp, pt_d_t, t_d_pt |
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| 75 | |
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| 76 | USE control_parameters, & |
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| 77 | ONLY: rho_surface |
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| 78 | |
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| 79 | USE indices, & |
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| 80 | ONLY: nxl, nxr, nyn, nys, nzb, nzb_2d, nzt |
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| 81 | |
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| 82 | USE kinds |
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| 83 | |
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| 84 | USE pegrid |
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| 85 | |
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| 86 | |
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| 87 | IMPLICIT NONE |
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| 88 | |
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| 89 | INTEGER(iwp) :: i !: |
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| 90 | INTEGER(iwp) :: j !: |
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| 91 | INTEGER(iwp) :: k !: |
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| 92 | INTEGER(iwp) :: k_help !: |
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| 93 | |
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| 94 | REAL(wp) :: df_p !: |
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| 95 | REAL(wp) :: df_m !: |
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| 96 | REAL(wp) :: effective_emission_up_m !: |
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| 97 | REAL(wp) :: effective_emission_up_p !: |
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| 98 | REAL(wp) :: effective_emission_down_m !: |
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| 99 | REAL(wp) :: effective_emission_down_p !: |
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| 100 | REAL(wp) :: f_up_m !: |
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| 101 | REAL(wp) :: f_up_p !: |
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| 102 | REAL(wp) :: f_down_m !: |
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| 103 | REAL(wp) :: f_down_p !: |
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| 104 | REAL(wp) :: impinging_flux_at_top !: |
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| 105 | REAL(wp) :: temperature !: |
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| 106 | |
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| 107 | |
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| 108 | ! |
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| 109 | !-- On first call, allocate temporary arrays |
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| 110 | IF ( first_call ) THEN |
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| 111 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 112 | lwp_top(nzb:nzt+1) ) |
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| 113 | first_call = .FALSE. |
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| 114 | ENDIF |
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| 115 | |
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| 116 | |
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| 117 | DO i = nxl, nxr |
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| 118 | DO j = nys, nyn |
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| 119 | ! |
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| 120 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 121 | !-- at all vertical levels |
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| 122 | lwp_ground(nzb) = 0.0 |
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| 123 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 124 | |
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| 125 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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| 126 | blackbody_emission(nzb) = sigma * temperature**4.0 |
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| 127 | |
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| 128 | DO k = nzb_2d(j,i)+1, nzt |
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| 129 | |
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| 130 | k_help = ( nzt+nzb+1 ) - k |
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| 131 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * & |
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| 132 | dzw(k) |
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| 133 | |
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| 134 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 135 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 136 | |
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| 137 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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| 138 | blackbody_emission(k) = sigma * temperature**4.0 |
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| 139 | |
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| 140 | ENDDO |
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| 141 | |
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| 142 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 143 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 144 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 145 | |
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| 146 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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| 147 | ql(nzt+1,j,i) |
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| 148 | blackbody_emission(nzt+1) = sigma * temperature**4.0 |
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| 149 | |
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| 150 | ! |
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| 151 | !-- See Chlond '92, this is just a first guess |
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| 152 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0 |
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| 153 | |
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| 154 | DO k = nzb_2d(j,i)+1, nzt |
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| 155 | ! |
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| 156 | !-- Save some computational time, but this may cause load |
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| 157 | !-- imbalances if ql is not distributed uniformly |
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| 158 | IF ( ql(k,j,i) /= 0.0 ) THEN |
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| 159 | ! |
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| 160 | !-- Compute effective emissivities |
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| 161 | effective_emission_up_p = 1.0 - & |
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| 162 | EXP( -130.0 * lwp_ground(k+1) ) |
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| 163 | effective_emission_up_m = 1.0 - & |
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| 164 | EXP( -130.0 * lwp_ground(k-1) ) |
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| 165 | effective_emission_down_p = 1.0 - & |
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| 166 | EXP( -158.0 * lwp_top(k+1) ) |
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| 167 | effective_emission_down_m = 1.0 - & |
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| 168 | EXP( -158.0 * lwp_top(k-1) ) |
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| 169 | |
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| 170 | ! |
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| 171 | !-- Compute vertical long wave radiation fluxes |
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| 172 | f_up_p = blackbody_emission(nzb) + & |
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| 173 | effective_emission_up_p * & |
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| 174 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 175 | |
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| 176 | f_up_m = blackbody_emission(nzb) + & |
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| 177 | effective_emission_up_m * & |
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| 178 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 179 | |
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| 180 | f_down_p = impinging_flux_at_top + & |
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| 181 | effective_emission_down_p * & |
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| 182 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 183 | |
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| 184 | f_down_m = impinging_flux_at_top + & |
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| 185 | effective_emission_down_m * & |
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| 186 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 187 | |
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| 188 | ! |
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| 189 | !-- Divergence of vertical long wave radiation fluxes |
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| 190 | df_p = f_up_p - f_down_p |
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| 191 | df_m = f_up_m - f_down_m |
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| 192 | |
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| 193 | ! |
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| 194 | !-- Compute tendency term |
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| 195 | tend(k,j,i) = tend(k,j,i) - & |
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| 196 | ( pt_d_t(k) / ( rho_surface * cp ) * & |
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| 197 | ( df_p - df_m ) / dzw(k) ) |
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| 198 | |
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| 199 | ENDIF |
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| 200 | |
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| 201 | ENDDO |
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| 202 | ENDDO |
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| 203 | ENDDO |
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| 204 | |
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| 205 | END SUBROUTINE calc_radiation |
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| 206 | |
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| 207 | |
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| 208 | !------------------------------------------------------------------------------! |
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| 209 | ! Call for grid point i,j |
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| 210 | !------------------------------------------------------------------------------! |
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| 211 | SUBROUTINE calc_radiation_ij( i, j ) |
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| 212 | |
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| 213 | USE arrays_3d, & |
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| 214 | ONLY: dzw, pt, ql, tend |
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| 215 | |
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| 216 | USE cloud_parameters, & |
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| 217 | ONLY: cp, l_d_cp, pt_d_t, t_d_pt |
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| 218 | |
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| 219 | USE control_parameters, & |
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| 220 | ONLY: rho_surface |
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| 221 | |
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| 222 | USE indices, & |
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| 223 | ONLY: nzb, nzb_2d, nzt |
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| 224 | |
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| 225 | USE kinds |
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| 226 | |
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| 227 | USE pegrid |
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| 228 | |
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| 229 | |
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| 230 | IMPLICIT NONE |
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| 231 | |
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| 232 | INTEGER(iwp) :: i !: |
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| 233 | INTEGER(iwp) :: j !: |
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| 234 | INTEGER(iwp) :: k !: |
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| 235 | INTEGER(iwp) :: k_help !: |
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| 236 | |
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| 237 | REAL(wp) :: df_p !: |
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| 238 | REAL(wp) :: df_m !: |
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| 239 | REAL(wp) :: effective_emission_up_m !: |
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| 240 | REAL(wp) :: effective_emission_up_p !: |
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| 241 | REAL(wp) :: effective_emission_down_m !: |
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| 242 | REAL(wp) :: effective_emission_down_p !: |
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| 243 | REAL(wp) :: f_up_m !: |
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| 244 | REAL(wp) :: f_up_p !: |
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| 245 | REAL(wp) :: f_down_m !: |
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| 246 | REAL(wp) :: f_down_p !: |
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| 247 | REAL(wp) :: impinging_flux_at_top !: |
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| 248 | REAL(wp) :: temperature !: |
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| 249 | |
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| 250 | |
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| 251 | ! |
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| 252 | !-- On first call, allocate temporary arrays |
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| 253 | IF ( first_call ) THEN |
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| 254 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
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| 255 | lwp_top(nzb:nzt+1) ) |
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| 256 | first_call = .FALSE. |
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| 257 | ENDIF |
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| 258 | |
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| 259 | ! |
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| 260 | !-- Compute the liquid water path (LWP) and blackbody_emission |
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| 261 | !-- at all vertical levels |
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| 262 | lwp_ground(nzb) = 0.0 |
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| 263 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 264 | |
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| 265 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
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| 266 | blackbody_emission(nzb) = sigma * temperature**4.0 |
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| 267 | |
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| 268 | DO k = nzb_2d(j,i)+1, nzt |
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| 269 | k_help = ( nzt+nzb+1 ) - k |
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| 270 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k) |
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| 271 | |
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| 272 | lwp_top(k_help) = lwp_top(k_help+1) + & |
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| 273 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
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| 274 | |
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| 275 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
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| 276 | blackbody_emission(k) = sigma * temperature**4.0 |
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| 277 | |
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| 278 | ENDDO |
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| 279 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
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| 280 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
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| 281 | lwp_top(nzb) = lwp_top(nzb+1) |
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| 282 | |
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| 283 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
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| 284 | ql(nzt+1,j,i) |
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| 285 | blackbody_emission(nzt+1) = sigma * temperature**4.0 |
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| 286 | |
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| 287 | ! |
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| 288 | !-- See Chlond '92, this is just a first guess |
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| 289 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0 |
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| 290 | |
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| 291 | DO k = nzb_2d(j,i)+1, nzt |
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| 292 | ! |
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| 293 | !-- Store some computational time, |
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| 294 | !-- this may cause load imbalances if ql is not distributed uniformly |
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| 295 | IF ( ql(k,j,i) /= 0.0 ) THEN |
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| 296 | ! |
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| 297 | !-- Compute effective emissivities |
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| 298 | effective_emission_up_p = 1.0 - & |
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| 299 | EXP( -130.0 * lwp_ground(k+1) ) |
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| 300 | effective_emission_up_m = 1.0 - & |
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| 301 | EXP( -130.0 * lwp_ground(k-1) ) |
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| 302 | effective_emission_down_p = 1.0 - & |
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| 303 | EXP( -158.0 * lwp_top(k+1) ) |
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| 304 | effective_emission_down_m = 1.0 - & |
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| 305 | EXP( -158.0 * lwp_top(k-1) ) |
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| 306 | |
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| 307 | ! |
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| 308 | !-- Compute vertical long wave radiation fluxes |
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| 309 | f_up_p = blackbody_emission(nzb) + effective_emission_up_p * & |
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| 310 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
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| 311 | |
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| 312 | f_up_m = blackbody_emission(nzb) + effective_emission_up_m * & |
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| 313 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
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| 314 | |
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| 315 | f_down_p = impinging_flux_at_top + effective_emission_down_p * & |
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| 316 | ( blackbody_emission(k) - impinging_flux_at_top ) |
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| 317 | |
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| 318 | f_down_m = impinging_flux_at_top + effective_emission_down_m * & |
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| 319 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
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| 320 | |
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| 321 | ! |
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| 322 | !- Divergence of vertical long wave radiation fluxes |
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| 323 | df_p = f_up_p - f_down_p |
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| 324 | df_m = f_up_m - f_down_m |
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| 325 | |
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| 326 | ! |
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| 327 | !-- Compute tendency term |
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| 328 | tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * & |
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| 329 | ( df_p - df_m ) / dzw(k) ) |
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| 330 | |
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| 331 | ENDIF |
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| 332 | |
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| 333 | ENDDO |
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| 334 | |
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| 335 | END SUBROUTINE calc_radiation_ij |
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| 336 | |
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| 337 | END MODULE calc_radiation_mod |
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