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source: palm/trunk/SOURCE/calc_radiation.f90 @ 1344

Last change on this file since 1344 was 1323, checked in by raasch, 11 years ago
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[1]	1	MODULE calc_radiation_mod
	2
[1036]	3	!--------------------------------------------------------------------------------!
	4	! This file is part of PALM.
	5	!
	6	! PALM is free software: you can redistribute it and/or modify it under the terms
	7	! of the GNU General Public License as published by the Free Software Foundation,
	8	! either version 3 of the License, or (at your option) any later version.
	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
[1310]	17	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	18	!--------------------------------------------------------------------------------!
	19	!
[484]	20	! Current revisions:
[1]	21	! -----------------
[1321]	22	!
[1323]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: calc_radiation.f90 1323 2014-03-20 17:09:54Z kanani $
	27	!
[1323]	28	! 1322 2014-03-20 16:38:49Z raasch
	29	! exponent 4.0 changed to integer
	30	!
[1321]	31	! 1320 2014-03-20 08:40:49Z raasch
[1320]	32	! ONLY-attribute added to USE-statements,
	33	! kind-parameters added to all INTEGER and REAL declaration statements,
	34	! kinds are defined in new module kinds,
	35	! revision history before 2012 removed,
	36	! comment fields (!:) to be used for variable explanations added to
	37	! all variable declaration statements
[1]	38	!
[1037]	39	! 1036 2012-10-22 13:43:42Z raasch
	40	! code put under GPL (PALM 3.9)
	41	!
[1]	42	! Revision 1.1 2000/04/13 14:42:45 schroeter
	43	! Initial revision
	44	!
	45	!
	46	! Description:
	47	! -------------
	48	! Calculation of the vertical divergences of the long-wave radiation-fluxes
	49	! based on the parameterization of the cloud effective emissivity
	50	!------------------------------------------------------------------------------!
[1320]	51	USE kinds
	52
[1]	53	PRIVATE
	54	PUBLIC calc_radiation
	55
[1320]	56	LOGICAL, SAVE :: first_call = .TRUE. !:
	57	REAL(wp), SAVE :: sigma = 5.67E-08 !:
[1]	58
[1320]	59	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground !:
	60	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_top !:
	61	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: blackbody_emission !:
[1]	62
	63	INTERFACE calc_radiation
	64	MODULE PROCEDURE calc_radiation
	65	MODULE PROCEDURE calc_radiation_ij
	66	END INTERFACE calc_radiation
	67
	68	CONTAINS
	69
	70
	71	!------------------------------------------------------------------------------!
	72	! Call for all grid points
	73	!------------------------------------------------------------------------------!
	74	SUBROUTINE calc_radiation
	75
[1320]	76	USE arrays_3d, &
	77	ONLY: dzw, pt, ql, tend
	78
	79	USE cloud_parameters, &
	80	ONLY: cp, l_d_cp, pt_d_t, t_d_pt
	81
	82	USE control_parameters, &
	83	ONLY: rho_surface
	84
	85	USE indices, &
	86	ONLY: nxl, nxr, nyn, nys, nzb, nzb_2d, nzt
	87
	88	USE kinds
	89
[1]	90	USE pegrid
	91
[1320]	92
[1]	93	IMPLICIT NONE
	94
[1320]	95	INTEGER(iwp) :: i !:
	96	INTEGER(iwp) :: j !:
	97	INTEGER(iwp) :: k !:
	98	INTEGER(iwp) :: k_help !:
[1]	99
[1320]	100	REAL(wp) :: df_p !:
	101	REAL(wp) :: df_m !:
	102	REAL(wp) :: effective_emission_up_m !:
	103	REAL(wp) :: effective_emission_up_p !:
	104	REAL(wp) :: effective_emission_down_m !:
	105	REAL(wp) :: effective_emission_down_p !:
	106	REAL(wp) :: f_up_m !:
	107	REAL(wp) :: f_up_p !:
	108	REAL(wp) :: f_down_m !:
	109	REAL(wp) :: f_down_p !:
	110	REAL(wp) :: impinging_flux_at_top !:
	111	REAL(wp) :: temperature !:
[1]	112
	113
	114	!
	115	!-- On first call, allocate temporary arrays
	116	IF ( first_call ) THEN
[1320]	117	ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), &
[1]	118	lwp_top(nzb:nzt+1) )
	119	first_call = .FALSE.
	120	ENDIF
	121
	122
	123	DO i = nxl, nxr
	124	DO j = nys, nyn
	125	!
	126	!-- Compute the liquid water path (LWP) and blackbody_emission
	127	!-- at all vertical levels
	128	lwp_ground(nzb) = 0.0
	129	lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	130
	131	temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i)
[1322]	132	blackbody_emission(nzb) = sigma * temperature**4
[1]	133
	134	DO k = nzb_2d(j,i)+1, nzt
	135
	136	k_help = ( nzt+nzb+1 ) - k
[1320]	137	lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * &
[1]	138	dzw(k)
	139
[1320]	140	lwp_top(k_help) = lwp_top(k_help+1) + &
[1]	141	rho_surface * ql(k_help,j,i) * dzw(k_help)
	142
	143	temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i)
[1322]	144	blackbody_emission(k) = sigma * temperature**4
[1]	145
	146	ENDDO
	147
[1320]	148	lwp_ground(nzt+1) = lwp_ground(nzt) + &
[1]	149	rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	150	lwp_top(nzb) = lwp_top(nzb+1)
	151
[1320]	152	temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * &
[1]	153	ql(nzt+1,j,i)
[1322]	154	blackbody_emission(nzt+1) = sigma * temperature**4
[1]	155
	156	!
	157	!-- See Chlond '92, this is just a first guess
	158	impinging_flux_at_top = blackbody_emission(nzb) - 100.0
	159
	160	DO k = nzb_2d(j,i)+1, nzt
	161	!
	162	!-- Save some computational time, but this may cause load
	163	!-- imbalances if ql is not distributed uniformly
	164	IF ( ql(k,j,i) /= 0.0 ) THEN
	165	!
	166	!-- Compute effective emissivities
[1320]	167	effective_emission_up_p = 1.0 - &
[1]	168	EXP( -130.0 * lwp_ground(k+1) )
[1320]	169	effective_emission_up_m = 1.0 - &
[1]	170	EXP( -130.0 * lwp_ground(k-1) )
[1320]	171	effective_emission_down_p = 1.0 - &
[1]	172	EXP( -158.0 * lwp_top(k+1) )
[1320]	173	effective_emission_down_m = 1.0 - &
[1]	174	EXP( -158.0 * lwp_top(k-1) )
	175
	176	!
	177	!-- Compute vertical long wave radiation fluxes
[1320]	178	f_up_p = blackbody_emission(nzb) + &
	179	effective_emission_up_p * &
[1]	180	( blackbody_emission(k) - blackbody_emission(nzb) )
	181
[1320]	182	f_up_m = blackbody_emission(nzb) + &
	183	effective_emission_up_m * &
[1]	184	( blackbody_emission(k-1) - blackbody_emission(nzb) )
	185
[1320]	186	f_down_p = impinging_flux_at_top + &
	187	effective_emission_down_p * &
[1]	188	( blackbody_emission(k) - impinging_flux_at_top )
	189
[1320]	190	f_down_m = impinging_flux_at_top + &
	191	effective_emission_down_m * &
[1]	192	( blackbody_emission(k-1) - impinging_flux_at_top )
	193
	194	!
	195	!-- Divergence of vertical long wave radiation fluxes
	196	df_p = f_up_p - f_down_p
	197	df_m = f_up_m - f_down_m
	198
	199	!
	200	!-- Compute tendency term
[1320]	201	tend(k,j,i) = tend(k,j,i) - &
	202	( pt_d_t(k) / ( rho_surface * cp ) * &
[1]	203	( df_p - df_m ) / dzw(k) )
	204
	205	ENDIF
	206
	207	ENDDO
	208	ENDDO
	209	ENDDO
	210
	211	END SUBROUTINE calc_radiation
	212
	213
	214	!------------------------------------------------------------------------------!
	215	! Call for grid point i,j
	216	!------------------------------------------------------------------------------!
	217	SUBROUTINE calc_radiation_ij( i, j )
	218
[1320]	219	USE arrays_3d, &
	220	ONLY: dzw, pt, ql, tend
	221
	222	USE cloud_parameters, &
	223	ONLY: cp, l_d_cp, pt_d_t, t_d_pt
	224
	225	USE control_parameters, &
	226	ONLY: rho_surface
	227
	228	USE indices, &
	229	ONLY: nzb, nzb_2d, nzt
	230
	231	USE kinds
	232
[1]	233	USE pegrid
[1320]	234
[1]	235
	236	IMPLICIT NONE
	237
[1320]	238	INTEGER(iwp) :: i !:
	239	INTEGER(iwp) :: j !:
	240	INTEGER(iwp) :: k !:
	241	INTEGER(iwp) :: k_help !:
[1]	242
[1320]	243	REAL(wp) :: df_p !:
	244	REAL(wp) :: df_m !:
	245	REAL(wp) :: effective_emission_up_m !:
	246	REAL(wp) :: effective_emission_up_p !:
	247	REAL(wp) :: effective_emission_down_m !:
	248	REAL(wp) :: effective_emission_down_p !:
	249	REAL(wp) :: f_up_m !:
	250	REAL(wp) :: f_up_p !:
	251	REAL(wp) :: f_down_m !:
	252	REAL(wp) :: f_down_p !:
	253	REAL(wp) :: impinging_flux_at_top !:
	254	REAL(wp) :: temperature !:
[1]	255
[1320]	256
[1]	257	!
	258	!-- On first call, allocate temporary arrays
	259	IF ( first_call ) THEN
[1320]	260	ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), &
[1]	261	lwp_top(nzb:nzt+1) )
	262	first_call = .FALSE.
	263	ENDIF
	264
	265	!
	266	!-- Compute the liquid water path (LWP) and blackbody_emission
	267	!-- at all vertical levels
	268	lwp_ground(nzb) = 0.0
	269	lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	270
	271	temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i)
[1322]	272	blackbody_emission(nzb) = sigma * temperature**4
[1]	273
	274	DO k = nzb_2d(j,i)+1, nzt
	275	k_help = ( nzt+nzb+1 ) - k
	276	lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k)
	277
[1320]	278	lwp_top(k_help) = lwp_top(k_help+1) + &
[1]	279	rho_surface * ql(k_help,j,i) * dzw(k_help)
	280
	281	temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i)
[1322]	282	blackbody_emission(k) = sigma * temperature**4
[1]	283
	284	ENDDO
[1320]	285	lwp_ground(nzt+1) = lwp_ground(nzt) + &
[1]	286	rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	287	lwp_top(nzb) = lwp_top(nzb+1)
	288
[1320]	289	temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * &
[1]	290	ql(nzt+1,j,i)
[1322]	291	blackbody_emission(nzt+1) = sigma * temperature**4
[1]	292
	293	!
	294	!-- See Chlond '92, this is just a first guess
	295	impinging_flux_at_top = blackbody_emission(nzb) - 100.0
	296
	297	DO k = nzb_2d(j,i)+1, nzt
	298	!
	299	!-- Store some computational time,
	300	!-- this may cause load imbalances if ql is not distributed uniformly
	301	IF ( ql(k,j,i) /= 0.0 ) THEN
	302	!
	303	!-- Compute effective emissivities
[1320]	304	effective_emission_up_p = 1.0 - &
[1]	305	EXP( -130.0 * lwp_ground(k+1) )
[1320]	306	effective_emission_up_m = 1.0 - &
[1]	307	EXP( -130.0 * lwp_ground(k-1) )
[1320]	308	effective_emission_down_p = 1.0 - &
[1]	309	EXP( -158.0 * lwp_top(k+1) )
[1320]	310	effective_emission_down_m = 1.0 - &
[1]	311	EXP( -158.0 * lwp_top(k-1) )
	312
	313	!
	314	!-- Compute vertical long wave radiation fluxes
[1320]	315	f_up_p = blackbody_emission(nzb) + effective_emission_up_p * &
[1]	316	( blackbody_emission(k) - blackbody_emission(nzb) )
	317
[1320]	318	f_up_m = blackbody_emission(nzb) + effective_emission_up_m * &
[1]	319	( blackbody_emission(k-1) - blackbody_emission(nzb) )
	320
[1320]	321	f_down_p = impinging_flux_at_top + effective_emission_down_p * &
[1]	322	( blackbody_emission(k) - impinging_flux_at_top )
	323
[1320]	324	f_down_m = impinging_flux_at_top + effective_emission_down_m * &
[1]	325	( blackbody_emission(k-1) - impinging_flux_at_top )
	326
	327	!
	328	!- Divergence of vertical long wave radiation fluxes
	329	df_p = f_up_p - f_down_p
	330	df_m = f_up_m - f_down_m
	331
	332	!
	333	!-- Compute tendency term
[1320]	334	tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * &
[1]	335	( df_p - df_m ) / dzw(k) )
	336
	337	ENDIF
	338
	339	ENDDO
	340
	341	END SUBROUTINE calc_radiation_ij
	342
	343	END MODULE calc_radiation_mod

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