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readaerosolstrato2_rrtm.F90 @ 5456

Last change on this file since 5456 was 5294, checked in by Laurent Fairhead, 2 months ago
Keeping clesphys.h was not the right solution LF
File size: 17.5 KB

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1	!
2	! $Id: readaerosolstrato2_rrtm.F90 2526 2016-05-26 22:13:40Z oboucher $
3	!
4	SUBROUTINE readaerosolstrato2_rrtm(debut, ok_volcan)
5
6	USE netcdf95, ONLY: nf95_close, nf95_gw_var, nf95_inq_dimid, &
7	nf95_inq_varid, nf95_open
8	USE netcdf, ONLY: nf90_get_var, nf90_noerr, nf90_nowrite
9
10	USE phys_cal_mod, ONLY : mth_cur
11	USE mod_grid_phy_lmdz, ONLY: nbp_lon, nbp_lat, klon_glo, grid2dTo1d_glo, grid_type, unstructured
12	USE mod_phys_lmdz_mpi_data
13	USE mod_phys_lmdz_omp_data
14	USE mod_phys_lmdz_para
15	USE phys_state_var_mod
16	USE phys_local_var_mod
17	USE aero_mod
18	USE dimphy
19	USE YOERAD, ONLY : NLW
20	USE YOMCST
21	USE lmdz_xios
22	! Temporary fix waiting for cleaner interface (or not)
23	USE clesphys_mod_h, ONLY: NSW
24
25	IMPLICIT NONE
26
27	!! INCLUDE "clesphys.h"
28
29	CHARACTER (len = 80) :: abort_message
30	CHARACTER (LEN=20) :: modname = 'readaerosolstrato2'
31
32	! Variable input
33	LOGICAL, INTENT(IN) :: debut
34	LOGICAL, INTENT(IN) :: ok_volcan !activate volcanic diags
35
36	! Variables locales
37	INTEGER n_lat ! number of latitudes in the input data
38	INTEGER n_lon ! number of longitudes
39	INTEGER n_lev ! number of levels in the input data
40	INTEGER n_month ! number of months in the input data
41	INTEGER n_wav ! number of wavelengths in the input data
42	REAL, ALLOCATABLE:: latitude(:)
43	REAL, ALLOCATABLE:: time(:)
44	REAL, ALLOCATABLE:: lev(:)
45	REAL, ALLOCATABLE:: wav(:)
46	INTEGER i,k,wave,band
47	INTEGER, SAVE :: mth_pre=1
48	!$OMP THREADPRIVATE(mth_pre)
49
50	REAL, ALLOCATABLE, DIMENSION(:,:,:), SAVE :: tau_aer_strat
51	REAL, ALLOCATABLE, DIMENSION(:,:,:), SAVE :: piz_aer_strat
52	REAL, ALLOCATABLE, DIMENSION(:,:,:), SAVE :: cg_aer_strat
53	REAL, ALLOCATABLE, DIMENSION(:,:,:), SAVE :: taulw_aer_strat
54	!$OMP THREADPRIVATE(tau_aer_strat,piz_aer_strat,cg_aer_strat,taulw_aer_strat)
55
56	! Champs reconstitues
57	REAL, ALLOCATABLE:: tauaerstrat(:, :, :, :)
58	REAL, ALLOCATABLE:: pizaerstrat(:, :, :, :)
59	REAL, ALLOCATABLE:: cgaerstrat(:, :, :, :)
60	REAL, ALLOCATABLE:: taulwaerstrat(:, :, :, :)
61
62	REAL, ALLOCATABLE:: tauaerstrat_mois(:, :, :, :)
63	REAL, ALLOCATABLE:: pizaerstrat_mois(:, :, :, :)
64	REAL, ALLOCATABLE:: cgaerstrat_mois(:, :, :, :)
65	REAL, ALLOCATABLE:: taulwaerstrat_mois(:, :, :, :)
66
67	REAL, ALLOCATABLE:: tauaerstrat_mois_glo(:, :, :)
68	REAL, ALLOCATABLE:: pizaerstrat_mois_glo(:, :, :)
69	REAL, ALLOCATABLE:: cgaerstrat_mois_glo(:, :, :)
70	REAL, ALLOCATABLE:: taulwaerstrat_mois_glo(:, :, :)
71	REAL, ALLOCATABLE:: tauaerstrat_mpi(:, :, :)
72	REAL, ALLOCATABLE:: pizaerstrat_mpi(:, :, :)
73	REAL, ALLOCATABLE:: cgaerstrat_mpi(:, :, :)
74	REAL, ALLOCATABLE:: taulwaerstrat_mpi(:, :, :)
75
76	! For NetCDF:
77	INTEGER ncid_in ! IDs for input files
78	INTEGER varid, ncerr
79
80	!--------------------------------------------------------
81
82	IF (.not.ALLOCATED(tau_aer_strat)) ALLOCATE(tau_aer_strat(klon,klev,NSW))
83	IF (.not.ALLOCATED(piz_aer_strat)) ALLOCATE(piz_aer_strat(klon,klev,NSW))
84	IF (.not.ALLOCATED(cg_aer_strat)) ALLOCATE(cg_aer_strat(klon,klev,NSW))
85
86	IF (.not.ALLOCATED(taulw_aer_strat)) ALLOCATE(taulw_aer_strat(klon,klev,NLW))
87
88	!--we only read monthly strat aerosol data
89	IF (debut.OR.mth_cur.NE.mth_pre) THEN
90
91	!--only root reads the data
92	IF (is_mpi_root.AND.is_omp_root) THEN
93
94	!--check mth_cur
95	IF (mth_cur.LT.1.OR.mth_cur.GT.12) THEN
96	print *,'probleme avec le mois dans readaerosolstrat =', mth_cur
97	ENDIF
98
99	!--initialize n_lon as input data is 2D (lat-alt) only
100	n_lon = nbp_lon
101
102	!--Starts with SW optical properties
103
104	CALL nf95_open("tauswstrat.2D.nc", nf90_nowrite, ncid_in)
105
106	CALL nf95_inq_varid(ncid_in, "LEV", varid)
107	CALL nf95_gw_var(ncid_in, varid, lev)
108	n_lev = size(lev)
109	IF (n_lev.NE.klev) THEN
110	abort_message='Le nombre de niveaux n est pas egal a klev'
111	CALL abort_physic(modname,abort_message,1)
112	ENDIF
113
114	CALL nf95_inq_varid(ncid_in, "LAT", varid)
115	CALL nf95_gw_var(ncid_in, varid, latitude)
116	n_lat = size(latitude)
117
118	IF (grid_type/=unstructured) THEN
119	IF (n_lat.NE.nbp_lat) THEN
120	print *, 'latitude=', n_lat, nbp_lat
121	abort_message='Le nombre de lat n est pas egal a nbp_lat'
122	CALL abort_physic(modname,abort_message,1)
123	ENDIF
124	ENDIF
125
126	CALL nf95_inq_varid(ncid_in, "TIME", varid)
127	CALL nf95_gw_var(ncid_in, varid, time)
128	n_month = size(time)
129	IF (n_month.NE.12) THEN
130	abort_message='Le nombre de month n est pas egal a 12'
131	CALL abort_physic(modname,abort_message,1)
132	ENDIF
133
134	CALL nf95_inq_varid(ncid_in, "WAV", varid)
135	CALL nf95_gw_var(ncid_in, varid, wav)
136	n_wav = size(wav)
137	print *, 'WAV aerosol strato=', n_wav, wav
138	IF (n_wav.NE.NSW) THEN
139	abort_message='Le nombre de wav n est pas egal a NSW'
140	CALL abort_physic(modname,abort_message,1)
141	ENDIF
142
143	ALLOCATE(tauaerstrat(n_lat, n_lev, n_wav, n_month))
144	ALLOCATE(pizaerstrat(n_lat, n_lev, n_wav, n_month))
145	ALLOCATE(cgaerstrat(n_lat, n_lev, n_wav, n_month))
146
147	!--reading stratospheric aerosol tau per layer
148	CALL nf95_inq_varid(ncid_in, "TAU_SUN", varid)
149	ncerr = nf90_get_var(ncid_in, varid, tauaerstrat)
150	print *,'code erreur readaerosolstrato=', ncerr, varid
151
152	!--reading stratospheric aerosol omega per layer
153	CALL nf95_inq_varid(ncid_in, "OME_SUN", varid)
154	ncerr = nf90_get_var(ncid_in, varid, pizaerstrat)
155	print *,'code erreur readaerosolstrato=', ncerr, varid
156
157	!--reading stratospheric aerosol g per layer
158	CALL nf95_inq_varid(ncid_in, "GGG_SUN", varid)
159	ncerr = nf90_get_var(ncid_in, varid, cgaerstrat)
160	print *,'code erreur readaerosolstrato sw=', ncerr, varid
161
162	CALL nf95_close(ncid_in)
163
164
165	IF (grid_type/=unstructured) THEN
166	ALLOCATE(tauaerstrat_mois(n_lon, n_lat, n_lev, n_wav))
167	ALLOCATE(pizaerstrat_mois(n_lon, n_lat, n_lev, n_wav))
168	ALLOCATE(cgaerstrat_mois(n_lon, n_lat, n_lev, n_wav))
169
170	ALLOCATE(tauaerstrat_mois_glo(klon_glo, n_lev, n_wav))
171	ALLOCATE(pizaerstrat_mois_glo(klon_glo, n_lev, n_wav))
172	ALLOCATE(cgaerstrat_mois_glo(klon_glo, n_lev, n_wav))
173	!--select the correct month
174	!--and copy into 1st longitude
175	tauaerstrat_mois(1,:,:,:) = tauaerstrat(:,:,:,mth_cur)
176	pizaerstrat_mois(1,:,:,:) = pizaerstrat(:,:,:,mth_cur)
177	cgaerstrat_mois(1,:,:,:) = cgaerstrat(:,:,:,mth_cur)
178
179	!--copy longitudes
180	DO i=2, n_lon
181	tauaerstrat_mois(i,:,:,:) = tauaerstrat_mois(1,:,:,:)
182	pizaerstrat_mois(i,:,:,:) = pizaerstrat_mois(1,:,:,:)
183	cgaerstrat_mois(i,:,:,:) = cgaerstrat_mois(1,:,:,:)
184	ENDDO
185
186	!---reduce to a klon_glo grid
187	DO band=1, NSW
188	CALL grid2dTo1d_glo(tauaerstrat_mois(:,:,:,band),tauaerstrat_mois_glo(:,:,band))
189	CALL grid2dTo1d_glo(pizaerstrat_mois(:,:,:,band),pizaerstrat_mois_glo(:,:,band))
190	CALL grid2dTo1d_glo(cgaerstrat_mois(:,:,:,band),cgaerstrat_mois_glo(:,:,band))
191	ENDDO
192	ENDIF
193	!--Now LW optical properties
194	!
195
196	CALL nf95_open("taulwstrat.2D.nc", nf90_nowrite, ncid_in)
197
198	CALL nf95_inq_varid(ncid_in, "LEV", varid)
199	CALL nf95_gw_var(ncid_in, varid, lev)
200	n_lev = size(lev)
201	IF (n_lev.NE.klev) THEN
202	abort_message='Le nombre de niveaux n est pas egal a klev'
203	CALL abort_physic(modname,abort_message,1)
204	ENDIF
205
206	CALL nf95_inq_varid(ncid_in, "LAT", varid)
207	CALL nf95_gw_var(ncid_in, varid, latitude)
208	n_lat = size(latitude)
209
210	IF (grid_type/=unstructured) THEN
211	IF (n_lat.NE.nbp_lat) THEN
212	abort_message='Le nombre de lat n est pas egal a nbp_lat'
213	CALL abort_physic(modname,abort_message,1)
214	ENDIF
215	ENDIF
216
217	CALL nf95_inq_varid(ncid_in, "TIME", varid)
218	CALL nf95_gw_var(ncid_in, varid, time)
219	n_month = size(time)
220	IF (n_month.NE.12) THEN
221	abort_message='Le nombre de month n est pas egal a 12'
222	CALL abort_physic(modname,abort_message,1)
223	ENDIF
224
225	CALL nf95_inq_varid(ncid_in, "WAV", varid)
226	CALL nf95_gw_var(ncid_in, varid, wav)
227	n_wav = size(wav)
228	print *, 'WAV aerosol strato=', n_wav, wav
229	IF (n_wav.NE.NLW) THEN
230	abort_message='Le nombre de wav n est pas egal a NLW'
231	CALL abort_physic(modname,abort_message,1)
232	ENDIF
233
234	ALLOCATE(taulwaerstrat(n_lat, n_lev, n_wav, n_month))
235
236	!--reading stratospheric aerosol lw tau per layer
237	CALL nf95_inq_varid(ncid_in, "TAU_EAR", varid)
238	ncerr = nf90_get_var(ncid_in, varid, taulwaerstrat)
239	print *,'code erreur readaerosolstrato lw=', ncerr, varid
240
241	CALL nf95_close(ncid_in)
242
243	IF (grid_type/=unstructured) THEN
244
245	ALLOCATE(taulwaerstrat_mois(n_lon, n_lat, n_lev, n_wav))
246	ALLOCATE(taulwaerstrat_mois_glo(klon_glo, n_lev, n_wav))
247
248	!--select the correct month
249	!--and copy into 1st longitude
250	taulwaerstrat_mois(1,:,:,:) = taulwaerstrat(:,:,:,mth_cur)
251	!--copy longitudes
252	DO i=2, n_lon
253	taulwaerstrat_mois(i,:,:,:) = taulwaerstrat_mois(1,:,:,:)
254	ENDDO
255
256	!---reduce to a klon_glo grid
257	DO band=1, NLW
258	CALL grid2dTo1d_glo(taulwaerstrat_mois(:,:,:,band),taulwaerstrat_mois_glo(:,:,band))
259	ENDDO
260	ENDIF
261
262	ELSE !--proc other than mpi_root and omp_root
263	!--dummy allocation needed for debug mode
264
265	ALLOCATE(tauaerstrat_mois_glo(1,1,1))
266	ALLOCATE(pizaerstrat_mois_glo(1,1,1))
267	ALLOCATE(cgaerstrat_mois_glo(1,1,1))
268	ALLOCATE(taulwaerstrat_mois_glo(1,1,1))
269
270	ALLOCATE(tauaerstrat(0,0,0,12))
271	ALLOCATE(pizaerstrat(0,0,0,12))
272	ALLOCATE(cgaerstrat(0,0,0,12))
273	ALLOCATE(taulwaerstrat(0,0,0,12))
274
275
276	ENDIF !--is_mpi_root and is_omp_root
277
278	!$OMP BARRIER
279
280	!--keep memory of previous month
281	mth_pre=mth_cur
282
283	IF (grid_type==unstructured) THEN
284
285	IF (is_omp_master) THEN
286	ALLOCATE(tauaerstrat_mpi(klon_mpi, klev, NSW))
287	ALLOCATE(pizaerstrat_mpi(klon_mpi, klev, NSW))
288	ALLOCATE(cgaerstrat_mpi(klon_mpi, klev, NSW))
289	ALLOCATE(taulwaerstrat_mpi(klon_mpi, klev, NLW))
290
291	CALL xios_send_field("tauaerstrat_in",SPREAD(tauaerstrat(:,:,:,mth_cur),1,8))
292	CALL xios_recv_field("tauaerstrat_out",tauaerstrat_mpi)
293	CALL xios_send_field("pizaerstrat_in",SPREAD(pizaerstrat(:,:,:,mth_cur),1,8))
294	CALL xios_recv_field("pizaerstrat_out",pizaerstrat_mpi)
295	CALL xios_send_field("cgaerstrat_in",SPREAD(cgaerstrat(:,:,:,mth_cur),1,8))
296	CALL xios_recv_field("cgaerstrat_out",cgaerstrat_mpi)
297	CALL xios_send_field("taulwaerstrat_in",SPREAD(taulwaerstrat(:,:,:,mth_cur),1,8))
298	CALL xios_recv_field("taulwaerstrat_out",taulwaerstrat_mpi)
299	ELSE
300	ALLOCATE(tauaerstrat_mpi(0, 0, 0))
301	ALLOCATE(pizaerstrat_mpi(0, 0, 0))
302	ALLOCATE(cgaerstrat_mpi(0, 0, 0))
303	ALLOCATE(taulwaerstrat_mpi(0, 0, 0))
304	ENDIF
305
306	CALL scatter_omp(tauaerstrat_mpi,tau_aer_strat)
307	CALL scatter_omp(pizaerstrat_mpi,piz_aer_strat)
308	CALL scatter_omp(cgaerstrat_mpi,cg_aer_strat)
309	CALL scatter_omp(taulwaerstrat_mpi,taulw_aer_strat)
310	ELSE
311
312	!--scatter on all proc
313	CALL scatter(tauaerstrat_mois_glo,tau_aer_strat)
314	CALL scatter(pizaerstrat_mois_glo,piz_aer_strat)
315	CALL scatter(cgaerstrat_mois_glo,cg_aer_strat)
316	CALL scatter(taulwaerstrat_mois_glo,taulw_aer_strat)
317	IF (is_mpi_root.AND.is_omp_root) DEALLOCATE(tauaerstrat_mois, pizaerstrat_mois, cgaerstrat_mois, taulwaerstrat_mois)
318
319	ENDIF
320
321	IF (is_mpi_root.AND.is_omp_root) THEN
322	DEALLOCATE(tauaerstrat, pizaerstrat, cgaerstrat,taulwaerstrat)
323	ENDIF
324
325
326	!$OMP BARRIER
327
328	ENDIF !--debut ou nouveau mois
329
330	!--total vertical aod at the 5 SW wavelengths
331	!--for now use band 3 AOD into all 5 wavelengths
332	!--it is only a reasonable approximation for 550 nm (wave=2)
333	band=3
334	DO i=1, klon
335	DO k=1, klev
336	IF (stratomask(i,k).GT.0.999999) THEN
337	DO wave=1, nwave_sw
338	tausum_aero(i,wave,id_STRAT_phy)=tausum_aero(i,wave,id_STRAT_phy)+tau_aer_strat(i,k,band)
339	ENDDO
340	ENDIF
341	ENDDO
342	ENDDO
343
344	IF (.NOT. ok_volcan) THEN
345	!
346	!--this is the default case
347	!--stratospheric aerosols are added to both index 2 and 1 for double radiation calls
348	!--weighted average for cg, piz and tau, adding strat aerosols on top of tropospheric ones
349	DO band=1, NSW
350	WHERE (stratomask.GT.0.999999)
351	!--strat aerosols are added to index 2 : natural and anthropogenic aerosols for bands 1 to NSW
352	cg_aero_sw_rrtm(:,:,2,band) = ( cg_aero_sw_rrtm(:,:,2,band)piz_aero_sw_rrtm(:,:,2,band)tau_aero_sw_rrtm(:,:,2,band) + &
353	cg_aer_strat(:,:,band)piz_aer_strat(:,:,band)tau_aer_strat(:,:,band) ) / &
354	MAX( piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) + &
355	piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band), 1.e-15 )
356	piz_aero_sw_rrtm(:,:,2,band) = ( piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) + &
357	piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) / &
358	MAX( tau_aero_sw_rrtm(:,:,2,band) + tau_aer_strat(:,:,band), 1.e-15 )
359	tau_aero_sw_rrtm(:,:,2,band) = tau_aero_sw_rrtm(:,:,2,band) + tau_aer_strat(:,:,band)
360	!--strat aerosols are added to index 1 : natural aerosols only for bands 1 to NSW
361	cg_aero_sw_rrtm(:,:,1,band) = ( cg_aero_sw_rrtm(:,:,1,band)piz_aero_sw_rrtm(:,:,1,band)tau_aero_sw_rrtm(:,:,1,band) + &
362	cg_aer_strat(:,:,band)piz_aer_strat(:,:,band)tau_aer_strat(:,:,band) ) / &
363	MAX( piz_aero_sw_rrtm(:,:,1,band)*tau_aero_sw_rrtm(:,:,1,band) + &
364	piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band), 1.e-15 )
365	piz_aero_sw_rrtm(:,:,1,band) = ( piz_aero_sw_rrtm(:,:,1,band)*tau_aero_sw_rrtm(:,:,1,band) + &
366	piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) / &
367	MAX( tau_aero_sw_rrtm(:,:,1,band) + tau_aer_strat(:,:,band), 1.e-15 )
368	tau_aero_sw_rrtm(:,:,1,band) = tau_aero_sw_rrtm(:,:,1,band) + tau_aer_strat(:,:,band)
369	ENDWHERE
370	ENDDO
371	!
372	ELSE
373	!
374	!--this is the VOLMIP case
375	!--stratospheric aerosols are only added to index 2 in this case
376	!--weighted average for cg, piz and tau, adding strat aerosols on top of tropospheric ones
377	DO band=1, NSW
378	WHERE (stratomask.GT.0.999999)
379	!--strat aerosols are added to index 2 : natural and anthropogenic aerosols for bands 1 to NSW
380	cg_aero_sw_rrtm(:,:,2,band) = ( cg_aero_sw_rrtm(:,:,2,band)piz_aero_sw_rrtm(:,:,2,band)tau_aero_sw_rrtm(:,:,2,band) + &
381	cg_aer_strat(:,:,band)piz_aer_strat(:,:,band)tau_aer_strat(:,:,band) ) / &
382	MAX( piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) + &
383	piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band), 1.e-15 )
384	piz_aero_sw_rrtm(:,:,2,band) = ( piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) + &
385	piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) / &
386	MAX( tau_aero_sw_rrtm(:,:,2,band) + tau_aer_strat(:,:,band), 1.e-15 )
387	tau_aero_sw_rrtm(:,:,2,band) = tau_aero_sw_rrtm(:,:,2,band) + tau_aer_strat(:,:,band)
388	ENDWHERE
389	ENDDO
390	ENDIF
391
392	!--total vertical aod at 10 um
393	!--this is approximated from band 7 of RRTM
394	band=7
395	DO i=1, klon
396	DO k=1, klev
397	IF (stratomask(i,k).GT.0.999999) THEN
398	DO wave=1, nwave_lw
399	tausum_aero(i,nwave_sw+wave,id_STRAT_phy)=tausum_aero(i,nwave_sw+wave,id_STRAT_phy)+taulw_aer_strat(i,k,band)
400	ENDDO
401	ENDIF
402	ENDDO
403	ENDDO
404
405	IF (.NOT. ok_volcan) THEN
406	!--this is the default case
407	!--stratospheric aerosols are added to both index 2 and 1
408	DO band=1, NLW
409	WHERE (stratomask.GT.0.999999)
410	tau_aero_lw_rrtm(:,:,2,band) = tau_aero_lw_rrtm(:,:,2,band) + taulw_aer_strat(:,:,band)
411	tau_aero_lw_rrtm(:,:,1,band) = tau_aero_lw_rrtm(:,:,1,band) + taulw_aer_strat(:,:,band)
412	ENDWHERE
413	ENDDO
414	!
415	ELSE
416	!
417	!--this is the VOLMIP case
418	DO band=1, NLW
419	!--stratospheric aerosols are not added to index 1
420	!--and we copy index 2 in index 1 because we want the same dust aerosol LW properties as above
421	tau_aero_lw_rrtm(:,:,1,band) = tau_aero_lw_rrtm(:,:,2,band)
422	!
423	WHERE (stratomask.GT.0.999999)
424	!--stratospheric aerosols are only added to index 2
425	tau_aero_lw_rrtm(:,:,2,band) = tau_aero_lw_rrtm(:,:,2,band) + taulw_aer_strat(:,:,band)
426	ENDWHERE
427	ENDDO
428	ENDIF
429
430	!--default SSA value if there is no aerosol
431	!--to avoid 0 values that seems to cause some problem to RRTM
432	WHERE (tau_aero_sw_rrtm.LT.1.e-14)
433	piz_aero_sw_rrtm = 1.0
434	ENDWHERE
435
436	!--in principle this should not be necessary
437	!--as these variables have min values already but just in case
438	!--put 1e-15 min value to both SW and LW AOD
439	tau_aero_sw_rrtm = MAX(tau_aero_sw_rrtm,1.e-15)
440	tau_aero_lw_rrtm = MAX(tau_aero_lw_rrtm,1.e-15)
441
442	END SUBROUTINE readaerosolstrato2_rrtm

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