| 1 | !> @file calc_radiation.f90 |
|---|
| 2 | !--------------------------------------------------------------------------------! |
|---|
| 3 | ! This file is part of PALM. |
|---|
| 4 | ! |
|---|
| 5 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
|---|
| 6 | ! of the GNU General Public License as published by the Free Software Foundation, |
|---|
| 7 | ! either version 3 of the License, or (at your option) any later version. |
|---|
| 8 | ! |
|---|
| 9 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
|---|
| 10 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
|---|
| 11 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
|---|
| 12 | ! |
|---|
| 13 | ! You should have received a copy of the GNU General Public License along with |
|---|
| 14 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
|---|
| 15 | ! |
|---|
| 16 | ! Copyright 1997-2016 Leibniz Universitaet Hannover |
|---|
| 17 | !--------------------------------------------------------------------------------! |
|---|
| 18 | ! |
|---|
| 19 | ! Current revisions: |
|---|
| 20 | ! ----------------- |
|---|
| 21 | ! |
|---|
| 22 | ! |
|---|
| 23 | ! Former revisions: |
|---|
| 24 | ! ----------------- |
|---|
| 25 | ! $Id: calc_radiation.f90 1818 2016-04-06 15:53:27Z raasch $ |
|---|
| 26 | ! |
|---|
| 27 | ! 1682 2015-10-07 23:56:08Z knoop |
|---|
| 28 | ! Code annotations made doxygen readable |
|---|
| 29 | ! |
|---|
| 30 | ! 1353 2014-04-08 15:21:23Z heinze |
|---|
| 31 | ! REAL constants provided with KIND-attribute |
|---|
| 32 | ! |
|---|
| 33 | ! 1322 2014-03-20 16:38:49Z raasch |
|---|
| 34 | ! exponent 4.0 changed to integer |
|---|
| 35 | ! |
|---|
| 36 | ! 1320 2014-03-20 08:40:49Z raasch |
|---|
| 37 | ! ONLY-attribute added to USE-statements, |
|---|
| 38 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
|---|
| 39 | ! kinds are defined in new module kinds, |
|---|
| 40 | ! revision history before 2012 removed, |
|---|
| 41 | ! comment fields (!:) to be used for variable explanations added to |
|---|
| 42 | ! all variable declaration statements |
|---|
| 43 | ! |
|---|
| 44 | ! 1036 2012-10-22 13:43:42Z raasch |
|---|
| 45 | ! code put under GPL (PALM 3.9) |
|---|
| 46 | ! |
|---|
| 47 | ! Revision 1.1 2000/04/13 14:42:45 schroeter |
|---|
| 48 | ! Initial revision |
|---|
| 49 | ! |
|---|
| 50 | ! |
|---|
| 51 | ! Description: |
|---|
| 52 | ! ------------- |
|---|
| 53 | !> Calculation of the vertical divergences of the long-wave radiation-fluxes |
|---|
| 54 | !> based on the parameterization of the cloud effective emissivity |
|---|
| 55 | !------------------------------------------------------------------------------! |
|---|
| 56 | MODULE calc_radiation_mod |
|---|
| 57 | |
|---|
| 58 | USE kinds |
|---|
| 59 | |
|---|
| 60 | PRIVATE |
|---|
| 61 | PUBLIC calc_radiation |
|---|
| 62 | |
|---|
| 63 | LOGICAL, SAVE :: first_call = .TRUE. !< |
|---|
| 64 | REAL(wp), SAVE :: sigma = 5.67E-08_wp !< |
|---|
| 65 | |
|---|
| 66 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground !< |
|---|
| 67 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_top !< |
|---|
| 68 | REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: blackbody_emission !< |
|---|
| 69 | |
|---|
| 70 | INTERFACE calc_radiation |
|---|
| 71 | MODULE PROCEDURE calc_radiation |
|---|
| 72 | MODULE PROCEDURE calc_radiation_ij |
|---|
| 73 | END INTERFACE calc_radiation |
|---|
| 74 | |
|---|
| 75 | CONTAINS |
|---|
| 76 | |
|---|
| 77 | |
|---|
| 78 | !------------------------------------------------------------------------------! |
|---|
| 79 | ! Description: |
|---|
| 80 | ! ------------ |
|---|
| 81 | !> Call for all grid points |
|---|
| 82 | !------------------------------------------------------------------------------! |
|---|
| 83 | SUBROUTINE calc_radiation |
|---|
| 84 | |
|---|
| 85 | USE arrays_3d, & |
|---|
| 86 | ONLY: dzw, pt, ql, tend |
|---|
| 87 | |
|---|
| 88 | USE cloud_parameters, & |
|---|
| 89 | ONLY: cp, l_d_cp, pt_d_t, t_d_pt |
|---|
| 90 | |
|---|
| 91 | USE control_parameters, & |
|---|
| 92 | ONLY: rho_surface |
|---|
| 93 | |
|---|
| 94 | USE indices, & |
|---|
| 95 | ONLY: nxl, nxr, nyn, nys, nzb, nzb_2d, nzt |
|---|
| 96 | |
|---|
| 97 | USE kinds |
|---|
| 98 | |
|---|
| 99 | USE pegrid |
|---|
| 100 | |
|---|
| 101 | |
|---|
| 102 | IMPLICIT NONE |
|---|
| 103 | |
|---|
| 104 | INTEGER(iwp) :: i !< |
|---|
| 105 | INTEGER(iwp) :: j !< |
|---|
| 106 | INTEGER(iwp) :: k !< |
|---|
| 107 | INTEGER(iwp) :: k_help !< |
|---|
| 108 | |
|---|
| 109 | REAL(wp) :: df_p !< |
|---|
| 110 | REAL(wp) :: df_m !< |
|---|
| 111 | REAL(wp) :: effective_emission_up_m !< |
|---|
| 112 | REAL(wp) :: effective_emission_up_p !< |
|---|
| 113 | REAL(wp) :: effective_emission_down_m !< |
|---|
| 114 | REAL(wp) :: effective_emission_down_p !< |
|---|
| 115 | REAL(wp) :: f_up_m !< |
|---|
| 116 | REAL(wp) :: f_up_p !< |
|---|
| 117 | REAL(wp) :: f_down_m !< |
|---|
| 118 | REAL(wp) :: f_down_p !< |
|---|
| 119 | REAL(wp) :: impinging_flux_at_top !< |
|---|
| 120 | REAL(wp) :: temperature !< |
|---|
| 121 | |
|---|
| 122 | |
|---|
| 123 | ! |
|---|
| 124 | !-- On first call, allocate temporary arrays |
|---|
| 125 | IF ( first_call ) THEN |
|---|
| 126 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
|---|
| 127 | lwp_top(nzb:nzt+1) ) |
|---|
| 128 | first_call = .FALSE. |
|---|
| 129 | ENDIF |
|---|
| 130 | |
|---|
| 131 | |
|---|
| 132 | DO i = nxl, nxr |
|---|
| 133 | DO j = nys, nyn |
|---|
| 134 | ! |
|---|
| 135 | !-- Compute the liquid water path (LWP) and blackbody_emission |
|---|
| 136 | !-- at all vertical levels |
|---|
| 137 | lwp_ground(nzb) = 0.0_wp |
|---|
| 138 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
|---|
| 139 | |
|---|
| 140 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
|---|
| 141 | blackbody_emission(nzb) = sigma * temperature**4 |
|---|
| 142 | |
|---|
| 143 | DO k = nzb_2d(j,i)+1, nzt |
|---|
| 144 | |
|---|
| 145 | k_help = ( nzt+nzb+1 ) - k |
|---|
| 146 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * & |
|---|
| 147 | dzw(k) |
|---|
| 148 | |
|---|
| 149 | lwp_top(k_help) = lwp_top(k_help+1) + & |
|---|
| 150 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
|---|
| 151 | |
|---|
| 152 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
|---|
| 153 | blackbody_emission(k) = sigma * temperature**4 |
|---|
| 154 | |
|---|
| 155 | ENDDO |
|---|
| 156 | |
|---|
| 157 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
|---|
| 158 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
|---|
| 159 | lwp_top(nzb) = lwp_top(nzb+1) |
|---|
| 160 | |
|---|
| 161 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
|---|
| 162 | ql(nzt+1,j,i) |
|---|
| 163 | blackbody_emission(nzt+1) = sigma * temperature**4 |
|---|
| 164 | |
|---|
| 165 | ! |
|---|
| 166 | !-- See Chlond '92, this is just a first guess |
|---|
| 167 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp |
|---|
| 168 | |
|---|
| 169 | DO k = nzb_2d(j,i)+1, nzt |
|---|
| 170 | ! |
|---|
| 171 | !-- Save some computational time, but this may cause load |
|---|
| 172 | !-- imbalances if ql is not distributed uniformly |
|---|
| 173 | IF ( ql(k,j,i) /= 0.0_wp ) THEN |
|---|
| 174 | ! |
|---|
| 175 | !-- Compute effective emissivities |
|---|
| 176 | effective_emission_up_p = 1.0_wp - & |
|---|
| 177 | EXP( -130.0_wp * lwp_ground(k+1) ) |
|---|
| 178 | effective_emission_up_m = 1.0_wp - & |
|---|
| 179 | EXP( -130.0_wp * lwp_ground(k-1) ) |
|---|
| 180 | effective_emission_down_p = 1.0_wp - & |
|---|
| 181 | EXP( -158.0_wp * lwp_top(k+1) ) |
|---|
| 182 | effective_emission_down_m = 1.0_wp - & |
|---|
| 183 | EXP( -158.0_wp * lwp_top(k-1) ) |
|---|
| 184 | |
|---|
| 185 | ! |
|---|
| 186 | !-- Compute vertical long wave radiation fluxes |
|---|
| 187 | f_up_p = blackbody_emission(nzb) + & |
|---|
| 188 | effective_emission_up_p * & |
|---|
| 189 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
|---|
| 190 | |
|---|
| 191 | f_up_m = blackbody_emission(nzb) + & |
|---|
| 192 | effective_emission_up_m * & |
|---|
| 193 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
|---|
| 194 | |
|---|
| 195 | f_down_p = impinging_flux_at_top + & |
|---|
| 196 | effective_emission_down_p * & |
|---|
| 197 | ( blackbody_emission(k) - impinging_flux_at_top ) |
|---|
| 198 | |
|---|
| 199 | f_down_m = impinging_flux_at_top + & |
|---|
| 200 | effective_emission_down_m * & |
|---|
| 201 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
|---|
| 202 | |
|---|
| 203 | ! |
|---|
| 204 | !-- Divergence of vertical long wave radiation fluxes |
|---|
| 205 | df_p = f_up_p - f_down_p |
|---|
| 206 | df_m = f_up_m - f_down_m |
|---|
| 207 | |
|---|
| 208 | ! |
|---|
| 209 | !-- Compute tendency term |
|---|
| 210 | tend(k,j,i) = tend(k,j,i) - & |
|---|
| 211 | ( pt_d_t(k) / ( rho_surface * cp ) * & |
|---|
| 212 | ( df_p - df_m ) / dzw(k) ) |
|---|
| 213 | |
|---|
| 214 | ENDIF |
|---|
| 215 | |
|---|
| 216 | ENDDO |
|---|
| 217 | ENDDO |
|---|
| 218 | ENDDO |
|---|
| 219 | |
|---|
| 220 | END SUBROUTINE calc_radiation |
|---|
| 221 | |
|---|
| 222 | |
|---|
| 223 | !------------------------------------------------------------------------------! |
|---|
| 224 | ! Description: |
|---|
| 225 | ! ------------ |
|---|
| 226 | !> Call for grid point i,j |
|---|
| 227 | !------------------------------------------------------------------------------! |
|---|
| 228 | SUBROUTINE calc_radiation_ij( i, j ) |
|---|
| 229 | |
|---|
| 230 | USE arrays_3d, & |
|---|
| 231 | ONLY: dzw, pt, ql, tend |
|---|
| 232 | |
|---|
| 233 | USE cloud_parameters, & |
|---|
| 234 | ONLY: cp, l_d_cp, pt_d_t, t_d_pt |
|---|
| 235 | |
|---|
| 236 | USE control_parameters, & |
|---|
| 237 | ONLY: rho_surface |
|---|
| 238 | |
|---|
| 239 | USE indices, & |
|---|
| 240 | ONLY: nzb, nzb_2d, nzt |
|---|
| 241 | |
|---|
| 242 | USE kinds |
|---|
| 243 | |
|---|
| 244 | USE pegrid |
|---|
| 245 | |
|---|
| 246 | |
|---|
| 247 | IMPLICIT NONE |
|---|
| 248 | |
|---|
| 249 | INTEGER(iwp) :: i !< |
|---|
| 250 | INTEGER(iwp) :: j !< |
|---|
| 251 | INTEGER(iwp) :: k !< |
|---|
| 252 | INTEGER(iwp) :: k_help !< |
|---|
| 253 | |
|---|
| 254 | REAL(wp) :: df_p !< |
|---|
| 255 | REAL(wp) :: df_m !< |
|---|
| 256 | REAL(wp) :: effective_emission_up_m !< |
|---|
| 257 | REAL(wp) :: effective_emission_up_p !< |
|---|
| 258 | REAL(wp) :: effective_emission_down_m !< |
|---|
| 259 | REAL(wp) :: effective_emission_down_p !< |
|---|
| 260 | REAL(wp) :: f_up_m !< |
|---|
| 261 | REAL(wp) :: f_up_p !< |
|---|
| 262 | REAL(wp) :: f_down_m !< |
|---|
| 263 | REAL(wp) :: f_down_p !< |
|---|
| 264 | REAL(wp) :: impinging_flux_at_top !< |
|---|
| 265 | REAL(wp) :: temperature !< |
|---|
| 266 | |
|---|
| 267 | |
|---|
| 268 | ! |
|---|
| 269 | !-- On first call, allocate temporary arrays |
|---|
| 270 | IF ( first_call ) THEN |
|---|
| 271 | ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), & |
|---|
| 272 | lwp_top(nzb:nzt+1) ) |
|---|
| 273 | first_call = .FALSE. |
|---|
| 274 | ENDIF |
|---|
| 275 | |
|---|
| 276 | ! |
|---|
| 277 | !-- Compute the liquid water path (LWP) and blackbody_emission |
|---|
| 278 | !-- at all vertical levels |
|---|
| 279 | lwp_ground(nzb) = 0.0_wp |
|---|
| 280 | lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
|---|
| 281 | |
|---|
| 282 | temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i) |
|---|
| 283 | blackbody_emission(nzb) = sigma * temperature**4 |
|---|
| 284 | |
|---|
| 285 | DO k = nzb_2d(j,i)+1, nzt |
|---|
| 286 | k_help = ( nzt+nzb+1 ) - k |
|---|
| 287 | lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k) |
|---|
| 288 | |
|---|
| 289 | lwp_top(k_help) = lwp_top(k_help+1) + & |
|---|
| 290 | rho_surface * ql(k_help,j,i) * dzw(k_help) |
|---|
| 291 | |
|---|
| 292 | temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i) |
|---|
| 293 | blackbody_emission(k) = sigma * temperature**4 |
|---|
| 294 | |
|---|
| 295 | ENDDO |
|---|
| 296 | lwp_ground(nzt+1) = lwp_ground(nzt) + & |
|---|
| 297 | rho_surface * ql(nzt+1,j,i) * dzw(nzt+1) |
|---|
| 298 | lwp_top(nzb) = lwp_top(nzb+1) |
|---|
| 299 | |
|---|
| 300 | temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * & |
|---|
| 301 | ql(nzt+1,j,i) |
|---|
| 302 | blackbody_emission(nzt+1) = sigma * temperature**4 |
|---|
| 303 | |
|---|
| 304 | ! |
|---|
| 305 | !-- See Chlond '92, this is just a first guess |
|---|
| 306 | impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp |
|---|
| 307 | |
|---|
| 308 | DO k = nzb_2d(j,i)+1, nzt |
|---|
| 309 | ! |
|---|
| 310 | !-- Store some computational time, |
|---|
| 311 | !-- this may cause load imbalances if ql is not distributed uniformly |
|---|
| 312 | IF ( ql(k,j,i) /= 0.0_wp ) THEN |
|---|
| 313 | ! |
|---|
| 314 | !-- Compute effective emissivities |
|---|
| 315 | effective_emission_up_p = 1.0_wp - & |
|---|
| 316 | EXP( -130.0_wp * lwp_ground(k+1) ) |
|---|
| 317 | effective_emission_up_m = 1.0_wp - & |
|---|
| 318 | EXP( -130.0_wp * lwp_ground(k-1) ) |
|---|
| 319 | effective_emission_down_p = 1.0_wp - & |
|---|
| 320 | EXP( -158.0_wp * lwp_top(k+1) ) |
|---|
| 321 | effective_emission_down_m = 1.0_wp - & |
|---|
| 322 | EXP( -158.0_wp * lwp_top(k-1) ) |
|---|
| 323 | |
|---|
| 324 | ! |
|---|
| 325 | !-- Compute vertical long wave radiation fluxes |
|---|
| 326 | f_up_p = blackbody_emission(nzb) + effective_emission_up_p * & |
|---|
| 327 | ( blackbody_emission(k) - blackbody_emission(nzb) ) |
|---|
| 328 | |
|---|
| 329 | f_up_m = blackbody_emission(nzb) + effective_emission_up_m * & |
|---|
| 330 | ( blackbody_emission(k-1) - blackbody_emission(nzb) ) |
|---|
| 331 | |
|---|
| 332 | f_down_p = impinging_flux_at_top + effective_emission_down_p * & |
|---|
| 333 | ( blackbody_emission(k) - impinging_flux_at_top ) |
|---|
| 334 | |
|---|
| 335 | f_down_m = impinging_flux_at_top + effective_emission_down_m * & |
|---|
| 336 | ( blackbody_emission(k-1) - impinging_flux_at_top ) |
|---|
| 337 | |
|---|
| 338 | ! |
|---|
| 339 | !- Divergence of vertical long wave radiation fluxes |
|---|
| 340 | df_p = f_up_p - f_down_p |
|---|
| 341 | df_m = f_up_m - f_down_m |
|---|
| 342 | |
|---|
| 343 | ! |
|---|
| 344 | !-- Compute tendency term |
|---|
| 345 | tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * & |
|---|
| 346 | ( df_p - df_m ) / dzw(k) ) |
|---|
| 347 | |
|---|
| 348 | ENDIF |
|---|
| 349 | |
|---|
| 350 | ENDDO |
|---|
| 351 | |
|---|
| 352 | END SUBROUTINE calc_radiation_ij |
|---|
| 353 | |
|---|
| 354 | END MODULE calc_radiation_mod |
|---|
