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source: palm/trunk/SOURCE/calc_radiation.f90 @ 1682

Last change on this file since 1682 was 1682, checked in by knoop, 9 years ago
Code annotations made doxygen readable
Property svn:keywords set to `Id`
File size: 12.9 KB

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[1682]	1	!> @file calc_radiation.f90
[1036]	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	!
[1310]	16	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	17	!--------------------------------------------------------------------------------!
	18	!
[484]	19	! Current revisions:
[1]	20	! -----------------
[1682]	21	! Code annotations made doxygen readable
[1354]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: calc_radiation.f90 1682 2015-10-07 23:56:08Z knoop $
	26	!
[1354]	27	! 1353 2014-04-08 15:21:23Z heinze
	28	! REAL constants provided with KIND-attribute
	29	!
[1323]	30	! 1322 2014-03-20 16:38:49Z raasch
	31	! exponent 4.0 changed to integer
	32	!
[1321]	33	! 1320 2014-03-20 08:40:49Z raasch
[1320]	34	! ONLY-attribute added to USE-statements,
	35	! kind-parameters added to all INTEGER and REAL declaration statements,
	36	! kinds are defined in new module kinds,
	37	! revision history before 2012 removed,
	38	! comment fields (!:) to be used for variable explanations added to
	39	! all variable declaration statements
[1]	40	!
[1037]	41	! 1036 2012-10-22 13:43:42Z raasch
	42	! code put under GPL (PALM 3.9)
	43	!
[1]	44	! Revision 1.1 2000/04/13 14:42:45 schroeter
	45	! Initial revision
	46	!
	47	!
	48	! Description:
	49	! -------------
[1682]	50	!> Calculation of the vertical divergences of the long-wave radiation-fluxes
	51	!> based on the parameterization of the cloud effective emissivity
[1]	52	!------------------------------------------------------------------------------!
[1682]	53	MODULE calc_radiation_mod
	54
[1320]	55	USE kinds
	56
[1]	57	PRIVATE
	58	PUBLIC calc_radiation
	59
[1682]	60	LOGICAL, SAVE :: first_call = .TRUE. !<
	61	REAL(wp), SAVE :: sigma = 5.67E-08_wp !<
[1]	62
[1682]	63	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground !<
	64	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_top !<
	65	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: blackbody_emission !<
[1]	66
	67	INTERFACE calc_radiation
	68	MODULE PROCEDURE calc_radiation
	69	MODULE PROCEDURE calc_radiation_ij
	70	END INTERFACE calc_radiation
	71
	72	CONTAINS
	73
	74
	75	!------------------------------------------------------------------------------!
[1682]	76	! Description:
	77	! ------------
	78	!> Call for all grid points
[1]	79	!------------------------------------------------------------------------------!
	80	SUBROUTINE calc_radiation
	81
[1320]	82	USE arrays_3d, &
	83	ONLY: dzw, pt, ql, tend
	84
	85	USE cloud_parameters, &
	86	ONLY: cp, l_d_cp, pt_d_t, t_d_pt
	87
	88	USE control_parameters, &
	89	ONLY: rho_surface
	90
	91	USE indices, &
	92	ONLY: nxl, nxr, nyn, nys, nzb, nzb_2d, nzt
	93
	94	USE kinds
	95
[1]	96	USE pegrid
	97
[1320]	98
[1]	99	IMPLICIT NONE
	100
[1682]	101	INTEGER(iwp) :: i !<
	102	INTEGER(iwp) :: j !<
	103	INTEGER(iwp) :: k !<
	104	INTEGER(iwp) :: k_help !<
[1]	105
[1682]	106	REAL(wp) :: df_p !<
	107	REAL(wp) :: df_m !<
	108	REAL(wp) :: effective_emission_up_m !<
	109	REAL(wp) :: effective_emission_up_p !<
	110	REAL(wp) :: effective_emission_down_m !<
	111	REAL(wp) :: effective_emission_down_p !<
	112	REAL(wp) :: f_up_m !<
	113	REAL(wp) :: f_up_p !<
	114	REAL(wp) :: f_down_m !<
	115	REAL(wp) :: f_down_p !<
	116	REAL(wp) :: impinging_flux_at_top !<
	117	REAL(wp) :: temperature !<
[1]	118
	119
	120	!
	121	!-- On first call, allocate temporary arrays
	122	IF ( first_call ) THEN
[1320]	123	ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), &
[1]	124	lwp_top(nzb:nzt+1) )
	125	first_call = .FALSE.
	126	ENDIF
	127
	128
	129	DO i = nxl, nxr
	130	DO j = nys, nyn
	131	!
	132	!-- Compute the liquid water path (LWP) and blackbody_emission
	133	!-- at all vertical levels
[1353]	134	lwp_ground(nzb) = 0.0_wp
[1]	135	lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	136
	137	temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i)
[1322]	138	blackbody_emission(nzb) = sigma * temperature**4
[1]	139
	140	DO k = nzb_2d(j,i)+1, nzt
	141
	142	k_help = ( nzt+nzb+1 ) - k
[1320]	143	lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * &
[1]	144	dzw(k)
	145
[1320]	146	lwp_top(k_help) = lwp_top(k_help+1) + &
[1]	147	rho_surface * ql(k_help,j,i) * dzw(k_help)
	148
	149	temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i)
[1322]	150	blackbody_emission(k) = sigma * temperature**4
[1]	151
	152	ENDDO
	153
[1320]	154	lwp_ground(nzt+1) = lwp_ground(nzt) + &
[1]	155	rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	156	lwp_top(nzb) = lwp_top(nzb+1)
	157
[1320]	158	temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * &
[1]	159	ql(nzt+1,j,i)
[1322]	160	blackbody_emission(nzt+1) = sigma * temperature**4
[1]	161
	162	!
	163	!-- See Chlond '92, this is just a first guess
[1353]	164	impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp
[1]	165
	166	DO k = nzb_2d(j,i)+1, nzt
	167	!
	168	!-- Save some computational time, but this may cause load
	169	!-- imbalances if ql is not distributed uniformly
[1353]	170	IF ( ql(k,j,i) /= 0.0_wp ) THEN
[1]	171	!
	172	!-- Compute effective emissivities
[1353]	173	effective_emission_up_p = 1.0_wp - &
	174	EXP( -130.0_wp * lwp_ground(k+1) )
	175	effective_emission_up_m = 1.0_wp - &
	176	EXP( -130.0_wp * lwp_ground(k-1) )
	177	effective_emission_down_p = 1.0_wp - &
	178	EXP( -158.0_wp * lwp_top(k+1) )
	179	effective_emission_down_m = 1.0_wp - &
	180	EXP( -158.0_wp * lwp_top(k-1) )
[1]	181
	182	!
	183	!-- Compute vertical long wave radiation fluxes
[1320]	184	f_up_p = blackbody_emission(nzb) + &
	185	effective_emission_up_p * &
[1]	186	( blackbody_emission(k) - blackbody_emission(nzb) )
	187
[1320]	188	f_up_m = blackbody_emission(nzb) + &
	189	effective_emission_up_m * &
[1]	190	( blackbody_emission(k-1) - blackbody_emission(nzb) )
	191
[1320]	192	f_down_p = impinging_flux_at_top + &
	193	effective_emission_down_p * &
[1]	194	( blackbody_emission(k) - impinging_flux_at_top )
	195
[1320]	196	f_down_m = impinging_flux_at_top + &
	197	effective_emission_down_m * &
[1]	198	( blackbody_emission(k-1) - impinging_flux_at_top )
	199
	200	!
	201	!-- Divergence of vertical long wave radiation fluxes
	202	df_p = f_up_p - f_down_p
	203	df_m = f_up_m - f_down_m
	204
	205	!
	206	!-- Compute tendency term
[1320]	207	tend(k,j,i) = tend(k,j,i) - &
	208	( pt_d_t(k) / ( rho_surface * cp ) * &
[1]	209	( df_p - df_m ) / dzw(k) )
	210
	211	ENDIF
	212
	213	ENDDO
	214	ENDDO
	215	ENDDO
	216
	217	END SUBROUTINE calc_radiation
	218
	219
	220	!------------------------------------------------------------------------------!
[1682]	221	! Description:
	222	! ------------
	223	!> Call for grid point i,j
[1]	224	!------------------------------------------------------------------------------!
	225	SUBROUTINE calc_radiation_ij( i, j )
	226
[1320]	227	USE arrays_3d, &
	228	ONLY: dzw, pt, ql, tend
	229
	230	USE cloud_parameters, &
	231	ONLY: cp, l_d_cp, pt_d_t, t_d_pt
	232
	233	USE control_parameters, &
	234	ONLY: rho_surface
	235
	236	USE indices, &
	237	ONLY: nzb, nzb_2d, nzt
	238
	239	USE kinds
	240
[1]	241	USE pegrid
[1320]	242
[1]	243
	244	IMPLICIT NONE
	245
[1682]	246	INTEGER(iwp) :: i !<
	247	INTEGER(iwp) :: j !<
	248	INTEGER(iwp) :: k !<
	249	INTEGER(iwp) :: k_help !<
[1]	250
[1682]	251	REAL(wp) :: df_p !<
	252	REAL(wp) :: df_m !<
	253	REAL(wp) :: effective_emission_up_m !<
	254	REAL(wp) :: effective_emission_up_p !<
	255	REAL(wp) :: effective_emission_down_m !<
	256	REAL(wp) :: effective_emission_down_p !<
	257	REAL(wp) :: f_up_m !<
	258	REAL(wp) :: f_up_p !<
	259	REAL(wp) :: f_down_m !<
	260	REAL(wp) :: f_down_p !<
	261	REAL(wp) :: impinging_flux_at_top !<
	262	REAL(wp) :: temperature !<
[1]	263
[1320]	264
[1]	265	!
	266	!-- On first call, allocate temporary arrays
	267	IF ( first_call ) THEN
[1320]	268	ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), &
[1]	269	lwp_top(nzb:nzt+1) )
	270	first_call = .FALSE.
	271	ENDIF
	272
	273	!
	274	!-- Compute the liquid water path (LWP) and blackbody_emission
	275	!-- at all vertical levels
[1353]	276	lwp_ground(nzb) = 0.0_wp
[1]	277	lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	278
	279	temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i)
[1322]	280	blackbody_emission(nzb) = sigma * temperature**4
[1]	281
	282	DO k = nzb_2d(j,i)+1, nzt
	283	k_help = ( nzt+nzb+1 ) - k
	284	lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k)
	285
[1320]	286	lwp_top(k_help) = lwp_top(k_help+1) + &
[1]	287	rho_surface * ql(k_help,j,i) * dzw(k_help)
	288
	289	temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i)
[1322]	290	blackbody_emission(k) = sigma * temperature**4
[1]	291
	292	ENDDO
[1320]	293	lwp_ground(nzt+1) = lwp_ground(nzt) + &
[1]	294	rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	295	lwp_top(nzb) = lwp_top(nzb+1)
	296
[1320]	297	temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * &
[1]	298	ql(nzt+1,j,i)
[1322]	299	blackbody_emission(nzt+1) = sigma * temperature**4
[1]	300
	301	!
	302	!-- See Chlond '92, this is just a first guess
[1353]	303	impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp
[1]	304
	305	DO k = nzb_2d(j,i)+1, nzt
	306	!
	307	!-- Store some computational time,
	308	!-- this may cause load imbalances if ql is not distributed uniformly
[1353]	309	IF ( ql(k,j,i) /= 0.0_wp ) THEN
[1]	310	!
	311	!-- Compute effective emissivities
[1353]	312	effective_emission_up_p = 1.0_wp - &
	313	EXP( -130.0_wp * lwp_ground(k+1) )
	314	effective_emission_up_m = 1.0_wp - &
	315	EXP( -130.0_wp * lwp_ground(k-1) )
	316	effective_emission_down_p = 1.0_wp - &
	317	EXP( -158.0_wp * lwp_top(k+1) )
	318	effective_emission_down_m = 1.0_wp - &
	319	EXP( -158.0_wp * lwp_top(k-1) )
[1]	320
	321	!
	322	!-- Compute vertical long wave radiation fluxes
[1320]	323	f_up_p = blackbody_emission(nzb) + effective_emission_up_p * &
[1]	324	( blackbody_emission(k) - blackbody_emission(nzb) )
	325
[1320]	326	f_up_m = blackbody_emission(nzb) + effective_emission_up_m * &
[1]	327	( blackbody_emission(k-1) - blackbody_emission(nzb) )
	328
[1320]	329	f_down_p = impinging_flux_at_top + effective_emission_down_p * &
[1]	330	( blackbody_emission(k) - impinging_flux_at_top )
	331
[1320]	332	f_down_m = impinging_flux_at_top + effective_emission_down_m * &
[1]	333	( blackbody_emission(k-1) - impinging_flux_at_top )
	334
	335	!
	336	!- Divergence of vertical long wave radiation fluxes
	337	df_p = f_up_p - f_down_p
	338	df_m = f_up_m - f_down_m
	339
	340	!
	341	!-- Compute tendency term
[1320]	342	tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * &
[1]	343	( df_p - df_m ) / dzw(k) )
	344
	345	ENDIF
	346
	347	ENDDO
	348
	349	END SUBROUTINE calc_radiation_ij
	350
	351	END MODULE calc_radiation_mod

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