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readaerosol.F90 @ 1

Last change on this file since 1 was 1, checked in by emillour, 14 years ago
Import initial LMDZ5
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1	! $Id: readaerosol.F90 1403 2010-07-01 09:02:53Z fairhead $
2	!
3	MODULE readaerosol_mod
4
5	REAL, SAVE :: not_valid=-333.
6
7	CONTAINS
8
9	SUBROUTINE readaerosol(name_aero, type, iyr_in, klev_src, pt_ap, pt_b, pt_out, psurf, load)
10
11	!****************************************************************************************
12	! This routine will read the aersosol from file.
13	!
14	! Read a year data with get_aero_fromfile depending on aer_type :
15	! - actuel : read year 1980
16	! - preind : read natural data
17	! - scenario : read one or two years and do eventually linare time interpolation
18	!
19	! Return pointer, pt_out, to the year read or result from interpolation
20	!****************************************************************************************
21	USE dimphy
22
23	IMPLICIT NONE
24
25	INCLUDE "iniprint.h"
26
27	! Input arguments
28	CHARACTER(len=7), INTENT(IN) :: name_aero
29	CHARACTER(len=*), INTENT(IN) :: type ! correspond to aer_type in clesphys.h
30	INTEGER, INTENT(IN) :: iyr_in
31
32	! Output
33	INTEGER, INTENT(OUT) :: klev_src
34	REAL, POINTER, DIMENSION(:) :: pt_ap ! Pointer for describing the vertical levels
35	REAL, POINTER, DIMENSION(:) :: pt_b ! Pointer for describing the vertical levels
36	REAL, POINTER, DIMENSION(:,:,:) :: pt_out ! The massvar distributions, DIMENSION(klon, klev_src, 12)
37	REAL, DIMENSION(klon,12), INTENT(OUT) :: psurf ! Surface pression for 12 months
38	REAL, DIMENSION(klon,12), INTENT(OUT) :: load ! Aerosol mass load in each column for 12 months
39
40	! Local variables
41	CHARACTER(len=4) :: cyear
42	REAL, POINTER, DIMENSION(:,:,:) :: pt_2
43	REAL, DIMENSION(klon,12) :: psurf2, load2
44	REAL :: p0 ! Reference pressure
45	INTEGER :: iyr1, iyr2, klev_src2
46	INTEGER :: it, k, i
47	LOGICAL, PARAMETER :: lonlyone=.FALSE.
48
49	!****************************************************************************************
50	! Read data depending on aer_type
51	!
52	!****************************************************************************************
53
54	IF (type == 'actuel') THEN
55	! Read and return data for year 1980
56	!****************************************************************************************
57	cyear='1980'
58	! get_aero_fromfile returns pt_out allocated and initialized with data for 12 month
59	! pt_out has dimensions (klon, klev_src, 12)
60	CALL get_aero_fromfile(name_aero, cyear, klev_src, pt_ap, pt_b, p0, pt_out, psurf, load)
61
62
63	ELSE IF (type == 'preind') THEN
64	! Read and return data from file with suffix .nat
65	!****************************************************************************************
66	cyear='.nat'
67	! get_aero_fromfile returns pt_out allocated and initialized with data for 12 month
68	! pt_out has dimensions (klon, klev_src, 12)
69	CALL get_aero_fromfile(name_aero, cyear, klev_src, pt_ap, pt_b, p0, pt_out, psurf, load)
70
71	ELSE IF (type == 'annuel') THEN
72	! Read and return data from scenario annual files
73	!****************************************************************************************
74	WRITE(cyear,'(I4)') iyr_in
75	WRITE(lunout,*) 'get_aero 3 iyr_in=', iyr_in,' ',cyear
76	! get_aero_fromfile returns pt_out allocated and initialized with data for nbr_tsteps month
77	! pt_out has dimensions (klon, klev_src, 12)
78	CALL get_aero_fromfile(name_aero, cyear, klev_src, pt_ap, pt_b, p0, pt_out, psurf, load)
79
80	ELSE IF (type == 'scenario') THEN
81	! Read data depending on actual year and interpolate if necessary
82	!****************************************************************************************
83	IF (iyr_in .LT. 1850) THEN
84	cyear='.nat'
85	WRITE(lunout,*) 'get_aero 1 iyr_in=', iyr_in,' ',cyear
86	! get_aero_fromfile returns pt_out allocated and initialized with data for 12 month
87	! pt_out has dimensions (klon, klev_src, 12)
88	CALL get_aero_fromfile(name_aero, cyear, klev_src, pt_ap, pt_b, p0, pt_out, psurf, load)
89
90	ELSE IF (iyr_in .GE. 2100) THEN
91	cyear='2100'
92	WRITE(lunout,*) 'get_aero 2 iyr_in=', iyr_in,' ',cyear
93	! get_aero_fromfile returns pt_out allocated and initialized with data for 12 month
94	! pt_out has dimensions (klon, klev_src, 12)
95	CALL get_aero_fromfile(name_aero, cyear, klev_src, pt_ap, pt_b, p0, pt_out, psurf, load)
96
97	ELSE
98	! Read data from 2 decades and interpolate to actual year
99	! a) from actual 10-yr-period
100	IF (iyr_in.LT.1900) THEN
101	iyr1 = 1850
102	iyr2 = 1900
103	ELSE IF (iyr_in.GE.1900.AND.iyr_in.LT.1920) THEN
104	iyr1 = 1900
105	iyr2 = 1920
106	ELSE
107	iyr1 = INT(iyr_in/10)*10
108	iyr2 = INT(1+iyr_in/10)*10
109	ENDIF
110
111	WRITE(cyear,'(I4)') iyr1
112	WRITE(lunout,*) 'get_aero 3 iyr_in=', iyr_in,' ',cyear
113	! get_aero_fromfile returns pt_out allocated and initialized with data for 12 month
114	! pt_out has dimensions (klon, klev_src, 12)
115	CALL get_aero_fromfile(name_aero, cyear, klev_src, pt_ap, pt_b, p0, pt_out, psurf, load)
116
117	! If to read two decades:
118	IF (.NOT.lonlyone) THEN
119
120	! b) from the next following one
121	WRITE(cyear,'(I4)') iyr2
122	WRITE(lunout,*) 'get_aero 4 iyr_in=', iyr_in,' ',cyear
123
124	NULLIFY(pt_2)
125	! get_aero_fromfile returns pt_2 allocated and initialized with data for 12 month
126	! pt_2 has dimensions (klon, klev_src, 12)
127	CALL get_aero_fromfile(name_aero, cyear, klev_src2, pt_ap, pt_b, p0, pt_2, psurf2, load2)
128	! Test for same number of vertical levels
129	IF (klev_src /= klev_src2) THEN
130	WRITE(lunout,*) 'Two aerosols files with different number of vertical levels is not allowded'
131	CALL abort_gcm('readaersosol','Error in number of vertical levels',1)
132	END IF
133
134	! Linare interpolate to the actual year:
135	DO it=1,12
136	DO k=1,klev_src
137	DO i = 1, klon
138	pt_out(i,k,it) = &
139	pt_out(i,k,it) - REAL(iyr_in-iyr1)/REAL(iyr2-iyr1) * &
140	(pt_out(i,k,it) - pt_2(i,k,it))
141	END DO
142	END DO
143
144	DO i = 1, klon
145	psurf(i,it) = &
146	psurf(i,it) - REAL(iyr_in-iyr1)/REAL(iyr2-iyr1) * &
147	(psurf(i,it) - psurf2(i,it))
148
149	load(i,it) = &
150	load(i,it) - REAL(iyr_in-iyr1)/REAL(iyr2-iyr1) * &
151	(load(i,it) - load2(i,it))
152	END DO
153	END DO
154
155	! Deallocate pt_2 no more needed
156	DEALLOCATE(pt_2)
157
158	END IF ! lonlyone
159	END IF ! iyr_in .LT. 1850
160
161	ELSE
162	WRITE(lunout,*)'This option is not implemented : aer_type = ', type
163	CALL abort_gcm('readaerosol','Error : aer_type parameter not accepted',1)
164	END IF ! type
165
166
167	END SUBROUTINE readaerosol
168
169
170	SUBROUTINE get_aero_fromfile(varname, cyr, klev_src, pt_ap, pt_b, p0, pt_year, psurf_out, load_out)
171	!****************************************************************************************
172	! Read 12 month aerosol from file and distribute to local process on physical grid.
173	! Vertical levels, klev_src, may differ from model levels if new file format.
174	!
175	! For mpi_root and master thread :
176	! 1) Open file
177	! 2) Find vertical dimension klev_src
178	! 3) Read field month by month
179	! 4) Close file
180	! 5) Transform the global field from 2D(iim, jjp+1) to 1D(klon_glo)
181	! - Also the levels and the latitudes have to be inversed
182	!
183	! For all processes and threads :
184	! 6) Scatter global field(klon_glo) to local process domain(klon)
185	! 7) Test for negative values
186	!****************************************************************************************
187
188	USE netcdf
189	USE dimphy
190	USE mod_grid_phy_lmdz
191	USE mod_phys_lmdz_para
192	USE iophy, ONLY : io_lon, io_lat
193
194	IMPLICIT NONE
195
196	INCLUDE "dimensions.h"
197	INCLUDE "iniprint.h"
198
199	! Input argumets
200	CHARACTER(len=7), INTENT(IN) :: varname
201	CHARACTER(len=4), INTENT(IN) :: cyr
202
203	! Output arguments
204	INTEGER, INTENT(OUT) :: klev_src ! Number of vertical levels in file
205	REAL, POINTER, DIMENSION(:) :: pt_ap ! Pointer for describing the vertical levels
206	REAL, POINTER, DIMENSION(:) :: pt_b ! Pointer for describing the vertical levels
207	REAL :: p0 ! Reference pressure value
208	REAL, POINTER, DIMENSION(:,:,:) :: pt_year ! Pointer-variabale from file, 12 month, grid : klon,klev_src
209	REAL, DIMENSION(klon,12), INTENT(OUT) :: psurf_out ! Surface pression for 12 months
210	REAL, DIMENSION(klon,12), INTENT(OUT) :: load_out ! Aerosol mass load in each column
211	INTEGER :: nbr_tsteps ! number of month in file read
212
213	! Local variables
214	CHARACTER(len=30) :: fname
215	CHARACTER(len=8) :: filename='aerosols'
216	CHARACTER(len=30) :: cvar
217	INTEGER :: ncid, dimid, varid
218	INTEGER :: imth, i, j, k, ierr
219	REAL :: npole, spole
220	REAL, ALLOCATABLE, DIMENSION(:,:,:) :: varmth
221	REAL, ALLOCATABLE, DIMENSION(:,:,:,:) :: varyear ! Global variable read from file, 12 month
222	REAL, ALLOCATABLE, DIMENSION(:,:,:) :: varyear_glo1D !(klon_glo, klev_src, 12)
223	REAL, ALLOCATABLE, DIMENSION(:) :: varktmp
224
225	REAL, DIMENSION(iim,jjm+1,12) :: psurf_glo2D ! Surface pression for 12 months on dynamics global grid
226	REAL, DIMENSION(klon_glo,12) :: psurf_glo1D ! -"- on physical global grid
227	REAL, DIMENSION(iim,jjm+1,12) :: load_glo2D ! Load for 12 months on dynamics global grid
228	REAL, DIMENSION(klon_glo,12) :: load_glo1D ! -"- on physical global grid
229	REAL, DIMENSION(iim,jjm+1) :: vartmp
230	REAL, DIMENSION(iim) :: lon_src ! longitudes in file
231	REAL, DIMENSION(jjm+1) :: lat_src, lat_src_inv ! latitudes in file
232	LOGICAL :: new_file ! true if new file format detected
233	LOGICAL :: invert_lat ! true if the field has to be inverted for latitudes
234
235
236	! Deallocate pointers
237	IF (ASSOCIATED(pt_ap)) DEALLOCATE(pt_ap)
238	IF (ASSOCIATED(pt_b)) DEALLOCATE(pt_b)
239
240	IF (is_mpi_root .AND. is_omp_root) THEN
241
242	! 1) Open file
243	!****************************************************************************************
244	fname = filename//cyr//'.nc'
245
246	WRITE(lunout,*) 'reading ', TRIM(fname)
247	CALL check_err( nf90_open(TRIM(fname), NF90_NOWRITE, ncid) )
248
249	! Test for equal longitudes and latitudes in file and model
250	!****************************************************************************************
251	! Read and test longitudes
252	CALL check_err( nf90_inq_varid(ncid, 'lon', varid) )
253	CALL check_err( nf90_get_var(ncid, varid, lon_src(:)) )
254
255	IF (maxval(ABS(lon_src - io_lon)) > 0.001) THEN
256	WRITE(lunout,*) 'Problem in longitudes read from file : ',TRIM(fname)
257	WRITE(lunout,*) 'longitudes in file ', TRIM(fname),' : ', lon_src
258	WRITE(lunout,*) 'longitudes in model :', io_lon
259
260	CALL abort_gcm('get_aero_fromfile', 'longitudes are not the same in file and model',1)
261	END IF
262
263	! Read and test latitudes
264	CALL check_err( nf90_inq_varid(ncid, 'lat', varid) )
265	CALL check_err( nf90_get_var(ncid, varid, lat_src(:)) )
266
267	! Invert source latitudes
268	DO j = 1, jjm+1
269	lat_src_inv(j) = lat_src(jjm+1 +1 -j)
270	END DO
271
272	IF (maxval(ABS(lat_src - io_lat)) < 0.001) THEN
273	! Latitudes are the same
274	invert_lat=.FALSE.
275	ELSE IF (maxval(ABS(lat_src_inv - io_lat)) < 0.001) THEN
276	! Inverted source latitudes correspond to model latitudes
277	WRITE(lunout,*) 'latitudes will be inverted for file : ',TRIM(fname)
278	invert_lat=.TRUE.
279	ELSE
280	WRITE(lunout,*) 'Problem in latitudes read from file : ',TRIM(fname)
281	WRITE(lunout,*) 'latitudes in file ', TRIM(fname),' : ', lat_src
282	WRITE(lunout,*) 'latitudes in model :', io_lat
283	CALL abort_gcm('get_aero_fromfile', 'latitudes do not correspond between file and model',1)
284	END IF
285
286	! 1.5) Check number of month in file opened
287	!
288	!**************************************************************************************************
289	ierr = nf90_inq_dimid(ncid, 'TIME',dimid)
290	CALL check_err( nf90_inquire_dimension(ncid, dimid, len = nbr_tsteps) )
291	! IF (nbr_tsteps /= 12 .AND. nbr_tsteps /= 14) THEN
292	IF (nbr_tsteps /= 12 ) THEN
293	CALL abort_gcm('get_aero_fromfile', 'not the right number of months in aerosol file read (should be 12 for the moment)',1)
294	ENDIF
295
296
297	! 2) Check if old or new file is avalabale.
298	! New type of file should contain the dimension 'lev'
299	! Old type of file should contain the dimension 'PRESNIVS'
300	!****************************************************************************************
301	ierr = nf90_inq_dimid(ncid, 'lev', dimid)
302	IF (ierr /= NF90_NOERR) THEN
303	! Coordinate axe lev not found. Check for presnivs.
304	ierr = nf90_inq_dimid(ncid, 'PRESNIVS', dimid)
305	IF (ierr /= NF90_NOERR) THEN
306	! Dimension PRESNIVS not found either
307	CALL abort_gcm('get_aero_fromfile', 'dimension lev or presnivs not in file',1)
308	ELSE
309	! Old file found
310	new_file=.FALSE.
311	WRITE(lunout,*) 'Vertical interpolation for ',TRIM(varname),' will not be done'
312	END IF
313	ELSE
314	! New file found
315	new_file=.TRUE.
316	WRITE(lunout,*) 'Vertical interpolation for ',TRIM(varname),' will be done'
317	END IF
318
319	! 2) Find vertical dimension klev_src
320	!****************************************************************************************
321	CALL check_err( nf90_inquire_dimension(ncid, dimid, len = klev_src) )
322
323	! Allocate variables depending on the number of vertical levels
324	ALLOCATE(varmth(iim, jjm+1, klev_src), varyear(iim, jjm+1, klev_src, 12), stat=ierr)
325	IF (ierr /= 0) CALL abort_gcm('get_aero_fromfile', 'pb in allocation 1',1)
326
327	ALLOCATE(pt_ap(klev_src), pt_b(klev_src), varktmp(klev_src), stat=ierr)
328	IF (ierr /= 0) CALL abort_gcm('get_aero_fromfile', 'pb in allocation 2',1)
329
330	! 3) Read all variables from file
331	! There is 2 options for the file structure :
332	! new_file=TRUE : read varyear, ps, pt_ap and pt_b
333	! new_file=FALSE : read varyear month by month
334	!****************************************************************************************
335
336	IF (new_file) THEN
337
338	! ++) Read the aerosol concentration month by month and concatenate to total variable varyear
339	!****************************************************************************************
340	! Get variable id
341	CALL check_err( nf90_inq_varid(ncid, TRIM(varname), varid) )
342
343	! Get the variable
344	CALL check_err( nf90_get_var(ncid, varid, varyear(:,:,:,:)) )
345
346	! ++) Read surface pression, 12 month in one variable
347	!****************************************************************************************
348	! Get variable id
349	CALL check_err( nf90_inq_varid(ncid, "ps", varid) )
350	! Get the variable
351	CALL check_err( nf90_get_var(ncid, varid, psurf_glo2D) )
352
353	! ++) Read mass load, 12 month in one variable
354	!****************************************************************************************
355	! Get variable id
356	CALL check_err( nf90_inq_varid(ncid, "load_"//TRIM(varname), varid) )
357	! Get the variable
358	CALL check_err( nf90_get_var(ncid, varid, load_glo2D) )
359
360	! ++) Read ap
361	!****************************************************************************************
362	! Get variable id
363	CALL check_err( nf90_inq_varid(ncid, "ap", varid) )
364	! Get the variable
365	CALL check_err( nf90_get_var(ncid, varid, pt_ap) )
366
367	! ++) Read b
368	!****************************************************************************************
369	! Get variable id
370	CALL check_err( nf90_inq_varid(ncid, "b", varid) )
371	! Get the variable
372	CALL check_err( nf90_get_var(ncid, varid, pt_b) )
373
374	! ++) Read p0 : reference pressure
375	!****************************************************************************************
376	! Get variable id
377	CALL check_err( nf90_inq_varid(ncid, "p0", varid) )
378	! Get the variable
379	CALL check_err( nf90_get_var(ncid, varid, p0) )
380
381
382	ELSE ! old file
383
384	! ++) Read the aerosol concentration month by month and concatenate to total variable varyear
385	!****************************************************************************************
386	DO imth=1, 12
387	IF (imth.EQ.1) THEN
388	cvar=TRIM(varname)//'JAN'
389	ELSE IF (imth.EQ.2) THEN
390	cvar=TRIM(varname)//'FEB'
391	ELSE IF (imth.EQ.3) THEN
392	cvar=TRIM(varname)//'MAR'
393	ELSE IF (imth.EQ.4) THEN
394	cvar=TRIM(varname)//'APR'
395	ELSE IF (imth.EQ.5) THEN
396	cvar=TRIM(varname)//'MAY'
397	ELSE IF (imth.EQ.6) THEN
398	cvar=TRIM(varname)//'JUN'
399	ELSE IF (imth.EQ.7) THEN
400	cvar=TRIM(varname)//'JUL'
401	ELSE IF (imth.EQ.8) THEN
402	cvar=TRIM(varname)//'AUG'
403	ELSE IF (imth.EQ.9) THEN
404	cvar=TRIM(varname)//'SEP'
405	ELSE IF (imth.EQ.10) THEN
406	cvar=TRIM(varname)//'OCT'
407	ELSE IF (imth.EQ.11) THEN
408	cvar=TRIM(varname)//'NOV'
409	ELSE IF (imth.EQ.12) THEN
410	cvar=TRIM(varname)//'DEC'
411	END IF
412
413	! Get variable id
414	CALL check_err( nf90_inq_varid(ncid, TRIM(cvar), varid) )
415
416	! Get the variable
417	CALL check_err( nf90_get_var(ncid, varid, varmth) )
418
419	! Store in variable for the whole year
420	varyear(:,:,:,imth)=varmth(:,:,:)
421
422	END DO
423
424	! Putting dummy
425	psurf_glo2D(:,:,:) = not_valid
426	load_glo2D(:,:,:) = not_valid
427	pt_ap(:) = not_valid
428	pt_b(:) = not_valid
429
430	END IF
431
432	! 4) Close file
433	!****************************************************************************************
434	CALL check_err( nf90_close(ncid) )
435
436
437	! 5) Transform the global field from 2D(iim, jjp+1) to 1D(klon_glo)
438	!****************************************************************************************
439	! Test if vertical levels have to be inversed
440
441	IF ((pt_b(1) < pt_b(klev_src)) .OR. .NOT. new_file) THEN
442	! WRITE(lunout,*) 'Vertical axis in file ',TRIM(fname), ' needs to be inverted'
443	! WRITE(lunout,*) 'before pt_ap = ', pt_ap
444	! WRITE(lunout,*) 'before pt_b = ', pt_b
445
446	! Inverse vertical levels for varyear
447	DO imth=1, 12
448	varmth(:,:,:) = varyear(:,:,:,imth) ! use varmth temporarly
449	DO k=1, klev_src
450	DO j=1, jjm+1
451	DO i=1,iim
452	varyear(i,j,k,imth) = varmth(i,j,klev_src+1-k)
453	END DO
454	END DO
455	END DO
456	END DO
457
458	! Inverte vertical axes for pt_ap and pt_b
459	varktmp(:) = pt_ap(:)
460	DO k=1, klev_src
461	pt_ap(k) = varktmp(klev_src+1-k)
462	END DO
463
464	varktmp(:) = pt_b(:)
465	DO k=1, klev_src
466	pt_b(k) = varktmp(klev_src+1-k)
467	END DO
468	WRITE(lunout,*) 'after pt_ap = ', pt_ap
469	WRITE(lunout,*) 'after pt_b = ', pt_b
470
471	ELSE
472	WRITE(lunout,*) 'Vertical axis in file ',TRIM(fname), ' is ok, no vertical inversion is done'
473	WRITE(lunout,*) 'pt_ap = ', pt_ap
474	WRITE(lunout,*) 'pt_b = ', pt_b
475	END IF
476
477	! - Invert latitudes if necessary
478	DO imth=1, 12
479	IF (invert_lat) THEN
480
481	! Invert latitudes for the variable
482	varmth(:,:,:) = varyear(:,:,:,imth) ! use varmth temporarly
483	DO k=1,klev_src
484	DO j=1,jjm+1
485	DO i=1,iim
486	varyear(i,j,k,imth) = varmth(i,jjm+1+1-j,k)
487	END DO
488	END DO
489	END DO
490
491	! Invert latitudes for surface pressure
492	vartmp(:,:) = psurf_glo2D(:,:,imth)
493	DO j=1, jjm+1
494	DO i=1,iim
495	psurf_glo2D(i,j,imth)= vartmp(i,jjm+1+1-j)
496	END DO
497	END DO
498
499	! Invert latitudes for the load
500	vartmp(:,:) = load_glo2D(:,:,imth)
501	DO j=1, jjm+1
502	DO i=1,iim
503	load_glo2D(i,j,imth)= vartmp(i,jjm+1+1-j)
504	END DO
505	END DO
506	END IF ! invert_lat
507
508	! Do zonal mead at poles and distribut at whole first and last latitude
509	DO k=1, klev_src
510	npole=0. ! North pole, j=1
511	spole=0. ! South pole, j=jjm+1
512	DO i=1,iim
513	npole = npole + varyear(i,1,k,imth)
514	spole = spole + varyear(i,jjm+1,k,imth)
515	END DO
516	npole = npole/REAL(iim)
517	spole = spole/REAL(iim)
518	varyear(:,1, k,imth) = npole
519	varyear(:,jjm+1,k,imth) = spole
520	END DO
521	END DO ! imth
522
523	ALLOCATE(varyear_glo1D(klon_glo, klev_src, 12), stat=ierr)
524	IF (ierr /= 0) CALL abort_gcm('get_aero_fromfile', 'pb in allocation 3',1)
525
526	! Transform from 2D to 1D field
527	CALL grid2Dto1D_glo(varyear,varyear_glo1D)
528	CALL grid2Dto1D_glo(psurf_glo2D,psurf_glo1D)
529	CALL grid2Dto1D_glo(load_glo2D,load_glo1D)
530
531	ELSE
532	ALLOCATE(varyear_glo1D(0,0,0))
533	END IF ! is_mpi_root .AND. is_omp_root
534
535	!$OMP BARRIER
536
537	! 6) Distribute to all processes
538	! Scatter global field(klon_glo) to local process domain(klon)
539	! and distribute klev_src to all processes
540	!****************************************************************************************
541
542	! Distribute klev_src
543	CALL bcast(klev_src)
544
545	! Allocate and distribute pt_ap and pt_b
546	IF (.NOT. ASSOCIATED(pt_ap)) THEN ! if pt_ap is allocated also pt_b is allocated
547	ALLOCATE(pt_ap(klev_src), pt_b(klev_src), stat=ierr)
548	IF (ierr /= 0) CALL abort_gcm('get_aero_fromfile', 'pb in allocation 4',1)
549	END IF
550	CALL bcast(pt_ap)
551	CALL bcast(pt_b)
552
553	! Allocate space for output pointer variable at local process
554	IF (ASSOCIATED(pt_year)) DEALLOCATE(pt_year)
555	ALLOCATE(pt_year(klon, klev_src, 12), stat=ierr)
556	IF (ierr /= 0) CALL abort_gcm('get_aero_fromfile', 'pb in allocation 5',1)
557
558	! Scatter global field to local domain at local process
559	CALL scatter(varyear_glo1D, pt_year)
560	CALL scatter(psurf_glo1D, psurf_out)
561	CALL scatter(load_glo1D, load_out)
562
563	! 7) Test for negative values
564	!****************************************************************************************
565	IF (MINVAL(pt_year) < 0.) THEN
566	WRITE(lunout,*) 'Warning! Negative values read from file :', fname
567	END IF
568
569	END SUBROUTINE get_aero_fromfile
570
571
572	SUBROUTINE check_err(status)
573	USE netcdf
574	IMPLICIT NONE
575
576	INCLUDE "iniprint.h"
577	INTEGER, INTENT (IN) :: status
578
579	IF (status /= NF90_NOERR) THEN
580	WRITE(lunout,*) 'Error in get_aero_fromfile ',status
581	CALL abort_gcm('get_aero_fromfile',trim(nf90_strerror(status)),1)
582	END IF
583
584	END SUBROUTINE check_err
585
586
587	END MODULE readaerosol_mod

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