source: LMDZ6/branches/Ocean_skin/libf/phylmd/rrtm/readaerosolstrato2_rrtm.F90 @ 5003

Last change on this file since 5003 was 3605, checked in by lguez, 5 years ago

Merge revisions 3427:3600 of trunk into branch Ocean_skin

File size: 17.5 KB
Line 
1!
2! $Id: readaerosolstrato2_rrtm.F90 2526 2016-05-26 22:13:40Z oboucher $
3!
4SUBROUTINE 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#ifdef CPP_XIOS
22    USE xios
23#endif
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, POINTER:: latitude(:)
43    REAL, POINTER:: time(:)
44    REAL, POINTER:: lev(:)
45    REAL, POINTER:: 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#ifdef CPP_XIOS
286
287        IF (is_omp_master) THEN
288          ALLOCATE(tauaerstrat_mpi(klon_mpi, klev, NSW))
289          ALLOCATE(pizaerstrat_mpi(klon_mpi, klev, NSW))
290          ALLOCATE(cgaerstrat_mpi(klon_mpi, klev, NSW))       
291          ALLOCATE(taulwaerstrat_mpi(klon_mpi, klev, NLW))
292         
293          CALL xios_send_field("tauaerstrat_in",SPREAD(tauaerstrat(:,:,:,mth_cur),1,8))
294          CALL xios_recv_field("tauaerstrat_out",tauaerstrat_mpi)
295          CALL xios_send_field("pizaerstrat_in",SPREAD(pizaerstrat(:,:,:,mth_cur),1,8))
296          CALL xios_recv_field("pizaerstrat_out",pizaerstrat_mpi)
297          CALL xios_send_field("cgaerstrat_in",SPREAD(cgaerstrat(:,:,:,mth_cur),1,8))
298          CALL xios_recv_field("cgaerstrat_out",cgaerstrat_mpi)
299          CALL xios_send_field("taulwaerstrat_in",SPREAD(taulwaerstrat(:,:,:,mth_cur),1,8))
300          CALL xios_recv_field("taulwaerstrat_out",taulwaerstrat_mpi)
301        ELSE
302          ALLOCATE(tauaerstrat_mpi(0, 0, 0))
303          ALLOCATE(pizaerstrat_mpi(0, 0, 0))
304          ALLOCATE(cgaerstrat_mpi(0, 0, 0))       
305          ALLOCATE(taulwaerstrat_mpi(0, 0, 0))
306        ENDIF 
307       
308        CALL scatter_omp(tauaerstrat_mpi,tau_aer_strat)
309        CALL scatter_omp(pizaerstrat_mpi,piz_aer_strat)
310        CALL scatter_omp(cgaerstrat_mpi,cg_aer_strat)
311        CALL scatter_omp(taulwaerstrat_mpi,taulw_aer_strat)
312#endif
313      ELSE 
314       
315!--scatter on all proc
316        CALL scatter(tauaerstrat_mois_glo,tau_aer_strat)
317        CALL scatter(pizaerstrat_mois_glo,piz_aer_strat)
318        CALL scatter(cgaerstrat_mois_glo,cg_aer_strat)
319        CALL scatter(taulwaerstrat_mois_glo,taulw_aer_strat)
320        IF (is_mpi_root.AND.is_omp_root)  DEALLOCATE(tauaerstrat_mois, pizaerstrat_mois, cgaerstrat_mois, taulwaerstrat_mois)
321
322      ENDIF
323
324      IF (is_mpi_root.AND.is_omp_root) THEN
325        DEALLOCATE(tauaerstrat, pizaerstrat, cgaerstrat,taulwaerstrat)
326      ENDIF
327     
328
329!$OMP BARRIER
330
331    ENDIF !--debut ou nouveau mois
332
333!--total vertical aod at the 5 SW wavelengths
334!--for now use band 3 AOD into all 5 wavelengths
335!--it is only a reasonable approximation for 550 nm (wave=2)
336    band=3
337    DO i=1, klon
338    DO k=1, klev
339      IF (stratomask(i,k).GT.0.999999) THEN
340        DO wave=1, nwave_sw
341          tausum_aero(i,wave,id_STRAT_phy)=tausum_aero(i,wave,id_STRAT_phy)+tau_aer_strat(i,k,band)
342        ENDDO
343      ENDIF
344    ENDDO
345    ENDDO
346
347    IF (.NOT. ok_volcan) THEN
348!
349!--this is the default case
350!--stratospheric aerosols are added to both index 2 and 1 for double radiation calls
351!--weighted average for cg, piz and tau, adding strat aerosols on top of tropospheric ones
352    DO band=1, NSW
353      WHERE (stratomask.GT.0.999999)
354!--strat aerosols are added to index 2 : natural and anthropogenic aerosols for bands 1 to NSW
355        cg_aero_sw_rrtm(:,:,2,band)  = ( cg_aero_sw_rrtm(:,:,2,band)*piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) + &
356                                         cg_aer_strat(:,:,band)*piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) /              &
357                                    MAX( piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) +                             &
358                                         piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band), 1.e-15 )
359        piz_aero_sw_rrtm(:,:,2,band) = ( piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) +                             &
360                                         piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) /                                     &
361                                    MAX( tau_aero_sw_rrtm(:,:,2,band) + tau_aer_strat(:,:,band), 1.e-15 )
362        tau_aero_sw_rrtm(:,:,2,band)  = tau_aero_sw_rrtm(:,:,2,band) + tau_aer_strat(:,:,band)
363!--strat aerosols are added to index 1 : natural aerosols only for bands 1 to NSW
364        cg_aero_sw_rrtm(:,:,1,band)  = ( cg_aero_sw_rrtm(:,:,1,band)*piz_aero_sw_rrtm(:,:,1,band)*tau_aero_sw_rrtm(:,:,1,band) + &
365                cg_aer_strat(:,:,band)*piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) /              &
366                MAX( piz_aero_sw_rrtm(:,:,1,band)*tau_aero_sw_rrtm(:,:,1,band) +                             &
367                piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band), 1.e-15 )
368        piz_aero_sw_rrtm(:,:,1,band) = ( piz_aero_sw_rrtm(:,:,1,band)*tau_aero_sw_rrtm(:,:,1,band) +                             &
369                piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) /                                     &
370                MAX( tau_aero_sw_rrtm(:,:,1,band) + tau_aer_strat(:,:,band), 1.e-15 )
371        tau_aero_sw_rrtm(:,:,1,band)  = tau_aero_sw_rrtm(:,:,1,band) + tau_aer_strat(:,:,band)
372    ENDWHERE
373    ENDDO
374!
375    ELSE
376!
377!--this is the VOLMIP case
378!--stratospheric aerosols are only added to index 2 in this case
379!--weighted average for cg, piz and tau, adding strat aerosols on top of tropospheric ones
380    DO band=1, NSW
381      WHERE (stratomask.GT.0.999999)
382!--strat aerosols are added to index 2 : natural and anthropogenic aerosols for bands 1 to NSW
383        cg_aero_sw_rrtm(:,:,2,band)  = ( cg_aero_sw_rrtm(:,:,2,band)*piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) + &
384                                         cg_aer_strat(:,:,band)*piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) /              &
385                                    MAX( piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) +                             &
386                                         piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band), 1.e-15 )
387        piz_aero_sw_rrtm(:,:,2,band) = ( piz_aero_sw_rrtm(:,:,2,band)*tau_aero_sw_rrtm(:,:,2,band) +                             &
388                                         piz_aer_strat(:,:,band)*tau_aer_strat(:,:,band) ) /                                     &
389                                    MAX( tau_aero_sw_rrtm(:,:,2,band) + tau_aer_strat(:,:,band), 1.e-15 )
390        tau_aero_sw_rrtm(:,:,2,band)  = tau_aero_sw_rrtm(:,:,2,band) + tau_aer_strat(:,:,band)
391     ENDWHERE
392  ENDDO
393  ENDIF
394
395!--total vertical aod at 10 um
396!--this is approximated from band 7 of RRTM
397    band=7
398    DO i=1, klon
399    DO k=1, klev
400      IF (stratomask(i,k).GT.0.999999) THEN
401        DO wave=1, nwave_lw
402          tausum_aero(i,nwave_sw+wave,id_STRAT_phy)=tausum_aero(i,nwave_sw+wave,id_STRAT_phy)+taulw_aer_strat(i,k,band)
403        ENDDO
404      ENDIF
405    ENDDO
406    ENDDO
407
408    IF (.NOT. ok_volcan) THEN
409!--this is the default case
410!--stratospheric aerosols are added to both index 2 and 1
411    DO band=1, NLW
412      WHERE (stratomask.GT.0.999999)
413        tau_aero_lw_rrtm(:,:,2,band)  = tau_aero_lw_rrtm(:,:,2,band) + taulw_aer_strat(:,:,band)
414        tau_aero_lw_rrtm(:,:,1,band)  = tau_aero_lw_rrtm(:,:,1,band) + taulw_aer_strat(:,:,band)
415      ENDWHERE
416    ENDDO
417!
418    ELSE
419!
420!--this is the VOLMIP case
421    DO band=1, NLW
422!--stratospheric aerosols are not added to index 1
423!--and we copy index 2 in index 1 because we want the same dust aerosol LW properties as above
424      tau_aero_lw_rrtm(:,:,1,band)  = tau_aero_lw_rrtm(:,:,2,band)
425!
426      WHERE (stratomask.GT.0.999999)
427!--stratospheric aerosols are only added to index 2
428        tau_aero_lw_rrtm(:,:,2,band)  = tau_aero_lw_rrtm(:,:,2,band) + taulw_aer_strat(:,:,band)
429      ENDWHERE
430    ENDDO
431    ENDIF
432
433!--default SSA value if there is no aerosol
434!--to avoid 0 values that seems to cause some problem to RRTM
435    WHERE (tau_aero_sw_rrtm.LT.1.e-14)
436      piz_aero_sw_rrtm = 1.0
437    ENDWHERE
438
439!--in principle this should not be necessary
440!--as these variables have min values already but just in case
441!--put 1e-15 min value to both SW and LW AOD
442    tau_aero_sw_rrtm = MAX(tau_aero_sw_rrtm,1.e-15)
443    tau_aero_lw_rrtm = MAX(tau_aero_lw_rrtm,1.e-15)
444
445END SUBROUTINE readaerosolstrato2_rrtm
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