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source: palm/trunk/SOURCE/calc_radiation.f90 @ 2497

Last change on this file since 2497 was 2233, checked in by suehring, 8 years ago
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[1873]	1	!> @file calc_radiation.f90
[2000]	2	!------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
[2000]	5	! PALM is free software: you can redistribute it and/or modify it under the
	6	! terms of the GNU General Public License as published by the Free Software
	7	! Foundation, either version 3 of the License, or (at your option) any later
	8	! version.
[1036]	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	!
[2101]	17	! Copyright 1997-2017 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[484]	20	! Current revisions:
[1]	21	! -----------------
[1354]	22	!
[2233]	23	!
[1321]	24	! Former revisions:
	25	! -----------------
	26	! $Id: calc_radiation.f90 2233 2017-05-30 18:08:54Z knoop $
	27	!
[2233]	28	! 2232 2017-05-30 17:47:52Z suehring
	29	! Adjustments to new topography concept
	30	!
[2001]	31	! 2000 2016-08-20 18:09:15Z knoop
	32	! Forced header and separation lines into 80 columns
	33	!
[1874]	34	! 1873 2016-04-18 14:50:06Z maronga
	35	! Module renamed (removed _mod)
	36	!
	37	!
[1851]	38	! 1850 2016-04-08 13:29:27Z maronga
	39	! Module renamed
	40	!
	41	!
[1683]	42	! 1682 2015-10-07 23:56:08Z knoop
	43	! Code annotations made doxygen readable
	44	!
[1354]	45	! 1353 2014-04-08 15:21:23Z heinze
	46	! REAL constants provided with KIND-attribute
	47	!
[1323]	48	! 1322 2014-03-20 16:38:49Z raasch
	49	! exponent 4.0 changed to integer
	50	!
[1321]	51	! 1320 2014-03-20 08:40:49Z raasch
[1320]	52	! ONLY-attribute added to USE-statements,
	53	! kind-parameters added to all INTEGER and REAL declaration statements,
	54	! kinds are defined in new module kinds,
	55	! revision history before 2012 removed,
	56	! comment fields (!:) to be used for variable explanations added to
	57	! all variable declaration statements
[1]	58	!
[1037]	59	! 1036 2012-10-22 13:43:42Z raasch
	60	! code put under GPL (PALM 3.9)
	61	!
[1]	62	! Revision 1.1 2000/04/13 14:42:45 schroeter
	63	! Initial revision
	64	!
	65	!
	66	! Description:
	67	! -------------
[1682]	68	!> Calculation of the vertical divergences of the long-wave radiation-fluxes
	69	!> based on the parameterization of the cloud effective emissivity
[1]	70	!------------------------------------------------------------------------------!
[1682]	71	MODULE calc_radiation_mod
	72
[1320]	73	USE kinds
	74
[1]	75	PRIVATE
	76	PUBLIC calc_radiation
	77
[1682]	78	LOGICAL, SAVE :: first_call = .TRUE. !<
	79	REAL(wp), SAVE :: sigma = 5.67E-08_wp !<
[1]	80
[1682]	81	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_ground !<
	82	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: lwp_top !<
	83	REAL(wp), DIMENSION(:), ALLOCATABLE, SAVE :: blackbody_emission !<
[1]	84
	85	INTERFACE calc_radiation
	86	MODULE PROCEDURE calc_radiation
	87	MODULE PROCEDURE calc_radiation_ij
	88	END INTERFACE calc_radiation
	89
	90	CONTAINS
	91
	92
	93	!------------------------------------------------------------------------------!
[1682]	94	! Description:
	95	! ------------
	96	!> Call for all grid points
[1]	97	!------------------------------------------------------------------------------!
	98	SUBROUTINE calc_radiation
	99
[1320]	100	USE arrays_3d, &
	101	ONLY: dzw, pt, ql, tend
	102
	103	USE cloud_parameters, &
	104	ONLY: cp, l_d_cp, pt_d_t, t_d_pt
	105
	106	USE control_parameters, &
	107	ONLY: rho_surface
	108
	109	USE indices, &
[2232]	110	ONLY: nxl, nxr, nyn, nys, nzb, nzt, wall_flags_0
[1320]	111
	112	USE kinds
	113
[1]	114	USE pegrid
	115
[1320]	116
[1]	117	IMPLICIT NONE
	118
[1682]	119	INTEGER(iwp) :: i !<
	120	INTEGER(iwp) :: j !<
	121	INTEGER(iwp) :: k !<
	122	INTEGER(iwp) :: k_help !<
[1]	123
[1682]	124	REAL(wp) :: df_p !<
	125	REAL(wp) :: df_m !<
	126	REAL(wp) :: effective_emission_up_m !<
	127	REAL(wp) :: effective_emission_up_p !<
	128	REAL(wp) :: effective_emission_down_m !<
	129	REAL(wp) :: effective_emission_down_p !<
	130	REAL(wp) :: f_up_m !<
	131	REAL(wp) :: f_up_p !<
	132	REAL(wp) :: f_down_m !<
	133	REAL(wp) :: f_down_p !<
	134	REAL(wp) :: impinging_flux_at_top !<
	135	REAL(wp) :: temperature !<
[1]	136
	137
	138	!
	139	!-- On first call, allocate temporary arrays
	140	IF ( first_call ) THEN
[1320]	141	ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), &
[1]	142	lwp_top(nzb:nzt+1) )
	143	first_call = .FALSE.
	144	ENDIF
	145
	146
	147	DO i = nxl, nxr
	148	DO j = nys, nyn
	149	!
	150	!-- Compute the liquid water path (LWP) and blackbody_emission
	151	!-- at all vertical levels
[1353]	152	lwp_ground(nzb) = 0.0_wp
[1]	153	lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	154
	155	temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i)
[1322]	156	blackbody_emission(nzb) = sigma * temperature**4
[1]	157
[2232]	158	DO k = nzb+1, nzt
[1]	159
	160	k_help = ( nzt+nzb+1 ) - k
[1320]	161	lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * &
[1]	162	dzw(k)
	163
[1320]	164	lwp_top(k_help) = lwp_top(k_help+1) + &
[1]	165	rho_surface * ql(k_help,j,i) * dzw(k_help)
	166
	167	temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i)
[2232]	168	blackbody_emission(k) = sigma * temperature**4 &
	169	* MERGE( 1.0_wp, 0.0_wp, &
	170	BTEST( wall_flags_0(k,j,i), 0 ) )
[1]	171
	172	ENDDO
	173
[1320]	174	lwp_ground(nzt+1) = lwp_ground(nzt) + &
[1]	175	rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	176	lwp_top(nzb) = lwp_top(nzb+1)
	177
[1320]	178	temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * &
[1]	179	ql(nzt+1,j,i)
[1322]	180	blackbody_emission(nzt+1) = sigma * temperature**4
[1]	181
	182	!
	183	!-- See Chlond '92, this is just a first guess
[1353]	184	impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp
[1]	185
[2232]	186	DO k = nzb+1, nzt
[1]	187	!
	188	!-- Save some computational time, but this may cause load
	189	!-- imbalances if ql is not distributed uniformly
[1353]	190	IF ( ql(k,j,i) /= 0.0_wp ) THEN
[1]	191	!
	192	!-- Compute effective emissivities
[1353]	193	effective_emission_up_p = 1.0_wp - &
	194	EXP( -130.0_wp * lwp_ground(k+1) )
	195	effective_emission_up_m = 1.0_wp - &
	196	EXP( -130.0_wp * lwp_ground(k-1) )
	197	effective_emission_down_p = 1.0_wp - &
	198	EXP( -158.0_wp * lwp_top(k+1) )
	199	effective_emission_down_m = 1.0_wp - &
	200	EXP( -158.0_wp * lwp_top(k-1) )
[1]	201
	202	!
	203	!-- Compute vertical long wave radiation fluxes
[1320]	204	f_up_p = blackbody_emission(nzb) + &
	205	effective_emission_up_p * &
[1]	206	( blackbody_emission(k) - blackbody_emission(nzb) )
	207
[1320]	208	f_up_m = blackbody_emission(nzb) + &
	209	effective_emission_up_m * &
[1]	210	( blackbody_emission(k-1) - blackbody_emission(nzb) )
	211
[1320]	212	f_down_p = impinging_flux_at_top + &
	213	effective_emission_down_p * &
[1]	214	( blackbody_emission(k) - impinging_flux_at_top )
	215
[1320]	216	f_down_m = impinging_flux_at_top + &
	217	effective_emission_down_m * &
[1]	218	( blackbody_emission(k-1) - impinging_flux_at_top )
	219
	220	!
	221	!-- Divergence of vertical long wave radiation fluxes
	222	df_p = f_up_p - f_down_p
	223	df_m = f_up_m - f_down_m
	224
	225	!
	226	!-- Compute tendency term
[1320]	227	tend(k,j,i) = tend(k,j,i) - &
	228	( pt_d_t(k) / ( rho_surface * cp ) * &
[2232]	229	( df_p - df_m ) / dzw(k) ) &
	230	* MERGE( 1.0_wp, 0.0_wp, &
	231	BTEST( wall_flags_0(k,j,i), 0 ) )
[1]	232
	233	ENDIF
	234
	235	ENDDO
	236	ENDDO
	237	ENDDO
	238
	239	END SUBROUTINE calc_radiation
	240
	241
	242	!------------------------------------------------------------------------------!
[1682]	243	! Description:
	244	! ------------
	245	!> Call for grid point i,j
[1]	246	!------------------------------------------------------------------------------!
	247	SUBROUTINE calc_radiation_ij( i, j )
	248
[1320]	249	USE arrays_3d, &
	250	ONLY: dzw, pt, ql, tend
	251
	252	USE cloud_parameters, &
	253	ONLY: cp, l_d_cp, pt_d_t, t_d_pt
	254
	255	USE control_parameters, &
	256	ONLY: rho_surface
	257
	258	USE indices, &
[2232]	259	ONLY: nzb, nzt, wall_flags_0
[1320]	260
	261	USE kinds
	262
[1]	263	USE pegrid
[1320]	264
[1]	265
	266	IMPLICIT NONE
	267
[1682]	268	INTEGER(iwp) :: i !<
	269	INTEGER(iwp) :: j !<
	270	INTEGER(iwp) :: k !<
	271	INTEGER(iwp) :: k_help !<
[1]	272
[1682]	273	REAL(wp) :: df_p !<
	274	REAL(wp) :: df_m !<
	275	REAL(wp) :: effective_emission_up_m !<
	276	REAL(wp) :: effective_emission_up_p !<
	277	REAL(wp) :: effective_emission_down_m !<
	278	REAL(wp) :: effective_emission_down_p !<
	279	REAL(wp) :: f_up_m !<
	280	REAL(wp) :: f_up_p !<
	281	REAL(wp) :: f_down_m !<
	282	REAL(wp) :: f_down_p !<
	283	REAL(wp) :: impinging_flux_at_top !<
	284	REAL(wp) :: temperature !<
[1]	285
[1320]	286
[1]	287	!
	288	!-- On first call, allocate temporary arrays
	289	IF ( first_call ) THEN
[1320]	290	ALLOCATE( blackbody_emission(nzb:nzt+1), lwp_ground(nzb:nzt+1), &
[1]	291	lwp_top(nzb:nzt+1) )
	292	first_call = .FALSE.
	293	ENDIF
	294
	295	!
	296	!-- Compute the liquid water path (LWP) and blackbody_emission
	297	!-- at all vertical levels
[1353]	298	lwp_ground(nzb) = 0.0_wp
[1]	299	lwp_top(nzt+1) = rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	300
	301	temperature = pt(nzb,j,i) * t_d_pt(nzb) + l_d_cp * ql(nzb,j,i)
[1322]	302	blackbody_emission(nzb) = sigma * temperature**4
[1]	303
[2232]	304	DO k = nzb+1, nzt
[1]	305	k_help = ( nzt+nzb+1 ) - k
	306	lwp_ground(k) = lwp_ground(k-1) + rho_surface * ql(k,j,i) * dzw(k)
	307
[1320]	308	lwp_top(k_help) = lwp_top(k_help+1) + &
[1]	309	rho_surface * ql(k_help,j,i) * dzw(k_help)
	310
	311	temperature = pt(k,j,i) * t_d_pt(k) + l_d_cp * ql(k,j,i)
[2232]	312	blackbody_emission(k) = sigma * temperature**4 &
	313	* MERGE( 1.0_wp, 0.0_wp, &
	314	BTEST( wall_flags_0(k,j,i), 0 ) )
[1]	315
	316	ENDDO
[1320]	317	lwp_ground(nzt+1) = lwp_ground(nzt) + &
[1]	318	rho_surface * ql(nzt+1,j,i) * dzw(nzt+1)
	319	lwp_top(nzb) = lwp_top(nzb+1)
	320
[1320]	321	temperature = pt(nzt+1,j,i) * t_d_pt(nzt+1) + l_d_cp * &
[1]	322	ql(nzt+1,j,i)
[1322]	323	blackbody_emission(nzt+1) = sigma * temperature**4
[1]	324
	325	!
	326	!-- See Chlond '92, this is just a first guess
[1353]	327	impinging_flux_at_top = blackbody_emission(nzb) - 100.0_wp
[1]	328
[2232]	329	DO k = nzb+1, nzt
[1]	330	!
	331	!-- Store some computational time,
	332	!-- this may cause load imbalances if ql is not distributed uniformly
[1353]	333	IF ( ql(k,j,i) /= 0.0_wp ) THEN
[1]	334	!
	335	!-- Compute effective emissivities
[1353]	336	effective_emission_up_p = 1.0_wp - &
	337	EXP( -130.0_wp * lwp_ground(k+1) )
	338	effective_emission_up_m = 1.0_wp - &
	339	EXP( -130.0_wp * lwp_ground(k-1) )
	340	effective_emission_down_p = 1.0_wp - &
	341	EXP( -158.0_wp * lwp_top(k+1) )
	342	effective_emission_down_m = 1.0_wp - &
	343	EXP( -158.0_wp * lwp_top(k-1) )
[1]	344
	345	!
	346	!-- Compute vertical long wave radiation fluxes
[1320]	347	f_up_p = blackbody_emission(nzb) + effective_emission_up_p * &
[1]	348	( blackbody_emission(k) - blackbody_emission(nzb) )
	349
[1320]	350	f_up_m = blackbody_emission(nzb) + effective_emission_up_m * &
[1]	351	( blackbody_emission(k-1) - blackbody_emission(nzb) )
	352
[1320]	353	f_down_p = impinging_flux_at_top + effective_emission_down_p * &
[1]	354	( blackbody_emission(k) - impinging_flux_at_top )
	355
[1320]	356	f_down_m = impinging_flux_at_top + effective_emission_down_m * &
[1]	357	( blackbody_emission(k-1) - impinging_flux_at_top )
	358
	359	!
	360	!- Divergence of vertical long wave radiation fluxes
	361	df_p = f_up_p - f_down_p
	362	df_m = f_up_m - f_down_m
	363
	364	!
	365	!-- Compute tendency term
[1320]	366	tend(k,j,i) = tend(k,j,i) - ( pt_d_t(k) / ( rho_surface * cp ) * &
[2232]	367	( df_p - df_m ) / dzw(k) ) &
	368	* MERGE( 1.0_wp, 0.0_wp, &
	369	BTEST( wall_flags_0(k,j,i), 0 ) )
[1]	370
	371	ENDIF
	372
	373	ENDDO
	374
	375	END SUBROUTINE calc_radiation_ij
	376
	377	END MODULE calc_radiation_mod

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