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readaerosol_interp.F90 @ 1572

Last change on this file since 1572 was 1492, checked in by Laurent Fairhead, 14 years ago

Merge of development branch LMDZ5V2.0-dev r1455:r1491 into the trunk.
Validation made locally: restart files are strictly equal between the HEAD of the trunk
and r1491 of LMDZ5V2.0-dev

Synchro de la branche de développement LMDZ5V2.0-dev r1455:r1491 et de la trunk
Validation faite en local: les fichiers restart sont équivalents entre la HEAD de la trunk
et la révision r1491 de LMDZ5V2.0-dev

File size: 23.0 KB

Rev	Line
[1179]	1	! $Id$
	2	!
[1337]	3	SUBROUTINE readaerosol_interp(id_aero, itap, pdtphys, r_day, first, pplay, paprs, t_seri, mass_out, pi_mass_out, load_src)
[1179]	4	!
	5	! This routine will return the mass concentration at actual day(mass_out) and
	6	! the pre-industrial values(pi_mass_out) for aerosol corresponding to "id_aero".
	7	! The mass concentrations for all aerosols are saved in this routine but each
	8	! call to this routine only treats the aerosol "id_aero".
	9	!
	10	! 1) Read in data for the whole year, only at first time step
	11	! 2) Interpolate to the actual day, only at new day
	12	! 3) Interpolate to the model vertical grid (target grid), only at new day
	13	! 4) Test for negative mass values
	14
[1265]	15	USE ioipsl
[1179]	16	USE dimphy, ONLY : klev,klon
	17	USE mod_phys_lmdz_para, ONLY : mpi_rank
	18	USE readaerosol_mod
[1183]	19	USE aero_mod, ONLY : naero_spc, name_aero
[1179]	20	USE write_field_phy
[1237]	21	USE phys_cal_mod
[1179]	22
	23	IMPLICIT NONE
	24
	25	INCLUDE "YOMCST.h"
	26	INCLUDE "chem.h"
	27	INCLUDE "temps.h"
	28	INCLUDE "clesphys.h"
	29	INCLUDE "iniprint.h"
	30	INCLUDE "dimensions.h"
	31	INCLUDE "comvert.h"
	32	!
	33	! Input:
	34	!****************************************************************************************
	35	INTEGER, INTENT(IN) :: id_aero! Identity number for the aerosol to treat
[1237]	36	INTEGER, INTENT(IN) :: itap ! Physic step count
	37	REAL, INTENT(IN) :: pdtphys! Physic day step
[1179]	38	REAL, INTENT(IN) :: r_day ! Day of integration
	39	LOGICAL, INTENT(IN) :: first ! First model timestep
	40	REAL, DIMENSION(klon,klev), INTENT(IN) :: pplay ! pression at model mid-layers
	41	REAL, DIMENSION(klon,klev+1),INTENT(IN):: paprs ! pression between model layers
[1216]	42	REAL, DIMENSION(klon,klev), INTENT(IN) :: t_seri ! air temperature
[1179]	43	!
	44	! Output:
	45	!****************************************************************************************
	46	REAL, INTENT(OUT) :: mass_out(klon,klev) ! Mass of aerosol (monthly mean data,from file) [ug AIBCM/m3]
	47	REAL, INTENT(OUT) :: pi_mass_out(klon,klev) ! Mass of preindustrial aerosol (monthly mean data,from file) [ug AIBCM/m3]
[1337]	48	REAL, INTENT(OUT) :: load_src(klon) ! Load of aerosol (monthly mean data,from file) [kg/m3]
[1179]	49	!
	50	! Local Variables:
	51	!****************************************************************************************
	52	INTEGER :: i, k, ierr
[1237]	53	INTEGER :: iday, iyr, lmt_pas
[1265]	54	! INTEGER :: im, day1, day2, im2
	55	INTEGER :: im, im2
	56	REAL :: day1, day2
[1179]	57	INTEGER :: pi_klev_src ! Only for testing purpose
	58	INTEGER, SAVE :: klev_src ! Number of vertical levles in source field
	59	!$OMP THREADPRIVATE(klev_src)
	60
[1216]	61	REAL :: zrho ! Air density [kg/m3]
	62	REAL :: volm ! Volyme de melange [kg/kg]
[1179]	63	REAL, DIMENSION(klon) :: psurf_day, pi_psurf_day
[1337]	64	REAL, DIMENSION(klon) :: pi_load_src ! Mass load at source grid
[1179]	65	REAL, DIMENSION(klon) :: load_tgt, load_tgt_test
	66	REAL, DIMENSION(klon,klev) :: delp ! pressure difference in each model layer
	67
	68	REAL, ALLOCATABLE, DIMENSION(:,:) :: pplay_src ! pression mid-layer at source levels
	69	REAL, ALLOCATABLE, DIMENSION(:,:) :: tmp1, tmp2 ! Temporary variables
	70	REAL, ALLOCATABLE, DIMENSION(:,:,:,:), SAVE :: var_year ! VAR in right dimension for the total year
	71	REAL, ALLOCATABLE, DIMENSION(:,:,:,:), SAVE :: pi_var_year ! pre-industrial VAR, -"-
	72	!$OMP THREADPRIVATE(var_year,pi_var_year)
	73	REAL, ALLOCATABLE, DIMENSION(:,:,:),SAVE :: var_day ! VAR interpolated to the actual day and model grid
	74	REAL, ALLOCATABLE, DIMENSION(:,:,:),SAVE :: pi_var_day ! pre-industrial VAR, -"-
	75	!$OMP THREADPRIVATE(var_day,pi_var_day)
	76	REAL, ALLOCATABLE, DIMENSION(:,:,:), SAVE :: psurf_year, pi_psurf_year ! surface pressure for the total year
	77	!$OMP THREADPRIVATE(psurf_year, pi_psurf_year)
	78	REAL, ALLOCATABLE, DIMENSION(:,:,:), SAVE :: load_year, pi_load_year ! load in the column for the total year
	79	!$OMP THREADPRIVATE(load_year, pi_load_year)
	80
	81	REAL, DIMENSION(:,:,:), POINTER :: pt_tmp ! Pointer allocated in readaerosol
	82	REAL, POINTER, DIMENSION(:), SAVE :: pt_ap, pt_b ! Pointer for describing the vertical levels
	83	!$OMP THREADPRIVATE(pt_ap, pt_b)
[1265]	84	INTEGER, SAVE :: nbr_tsteps ! number of time steps in file read
	85	REAL, DIMENSION(14), SAVE :: month_len, month_start, month_mid
[1270]	86	!$OMP THREADPRIVATE(nbr_tsteps, month_len, month_start, month_mid)
[1265]	87	REAL :: jDay
[1179]	88
	89	LOGICAL :: lnewday ! Indicates if first time step at a new day
[1237]	90	LOGICAL :: OLDNEWDAY
[1179]	91	LOGICAL,SAVE :: vert_interp ! Indicates if vertical interpolation will be done
[1181]	92	LOGICAL,SAVE :: debug=.FALSE.! Debugging in this subroutine
[1179]	93	!$OMP THREADPRIVATE(vert_interp, debug)
[1492]	94	CHARACTER(len=8) :: type
	95	CHARACTER(len=8) :: filename
[1179]	96
	97
	98	!****************************************************************************************
	99	! Initialization
	100	!
	101	!****************************************************************************************
	102
	103	! Calculation to find if it is a new day
[1237]	104
[1249]	105	IF(mpi_rank == 0 .AND. debug )then
[1237]	106	PRINT*,'CONTROL PANEL REGARDING TIME STEPING'
	107	ENDIF
	108
	109	! Use phys_cal_mod
[1273]	110	iday= day_cur
	111	iyr = year_cur
	112	im = mth_cur
[1237]	113
[1273]	114	! iday = INT(r_day)
	115	! iyr = iday/360
	116	! iday = iday-iyr*360 ! day of the actual year
	117	! iyr = iyr + annee_ref ! year of the run
	118	! im = iday/30 +1 ! the actual month
[1265]	119	CALL ymds2ju(iyr, im, iday, 0., jDay)
[1273]	120	! CALL ymds2ju(iyr, im, iday-(im-1)*30, 0., jDay)
[1179]	121
[1273]	122
[1237]	123	IF(MOD(itap-1,NINT(86400./pdtphys)) == 0)THEN
	124	lnewday=.TRUE.
[1249]	125	ELSE
	126	lnewday=.FALSE.
[1237]	127	ENDIF
[1179]	128
[1249]	129	IF(mpi_rank == 0 .AND. debug)then
[1237]	130	! 0.02 is about 0.5/24, namly less than half an hour
[1403]	131	OLDNEWDAY = (r_day-REAL(iday) < 0.02)
[1237]	132	! Once per day, update aerosol fields
	133	lmt_pas = NINT(86400./pdtphys)
[1403]	134	PRINT*,'r_day-REAL(iday) =',r_day-REAL(iday)
[1237]	135	PRINT*,'itap =',itap
	136	PRINT*,'pdtphys =',pdtphys
	137	PRINT*,'lmt_pas =',lmt_pas
	138	PRINT*,'iday =',iday
	139	PRINT*,'r_day =',r_day
[1246]	140	PRINT*,'day_cur =',day_cur
	141	PRINT*,'mth_cur =',mth_cur
	142	PRINT*,'year_cur =',year_cur
[1237]	143	PRINT*,'NINT(86400./pdtphys) =',NINT(86400./pdtphys)
	144	PRINT*,'MOD(0,1) =',MOD(0,1)
	145	PRINT*,'lnewday =',lnewday
	146	PRINT*,'OLDNEWDAY =',OLDNEWDAY
	147	ENDIF
	148
[1179]	149	IF (.NOT. ALLOCATED(var_day)) THEN
[1181]	150	ALLOCATE( var_day(klon, klev, naero_spc), stat=ierr)
[1179]	151	IF (ierr /= 0) CALL abort_gcm('readaerosol_interp', 'pb in allocation 1',1)
[1181]	152	ALLOCATE( pi_var_day(klon, klev, naero_spc), stat=ierr)
[1179]	153	IF (ierr /= 0) CALL abort_gcm('readaerosol_interp', 'pb in allocation 2',1)
	154
[1270]	155	ALLOCATE( psurf_year(klon, 12, naero_spc), pi_psurf_year(klon, 12, naero_spc), stat=ierr)
	156	IF (ierr /= 0) CALL abort_gcm('readaerosol_interp', 'pb in allocation 3',1)
[1179]	157
[1270]	158	ALLOCATE( load_year(klon, 12, naero_spc), pi_load_year(klon, 12, naero_spc), stat=ierr)
	159	IF (ierr /= 0) CALL abort_gcm('readaerosol_interp', 'pb in allocation 4',1)
	160
[1179]	161	lnewday=.TRUE.
	162
	163	NULLIFY(pt_ap)
	164	NULLIFY(pt_b)
	165	END IF
	166
	167	!****************************************************************************************
	168	! 1) Read in data : corresponding to the actual year and preindustrial data.
	169	! Only for the first day of the year.
	170	!
	171	!****************************************************************************************
[1246]	172	IF ( (first .OR. iday==0) .AND. lnewday ) THEN
[1179]	173	NULLIFY(pt_tmp)
	174
	175	! Reading values corresponding to the closest year taking into count the choice of aer_type.
	176	! For aer_type=scenario interpolation between 2 data sets is done in readaerosol.
[1492]	177	! If aer_type=mix1 or mix2, the run type and file name depends on the aerosol.
	178	IF (aer_type=='preind' .OR. aer_type=='actuel' .OR. aer_type=='annuel' .OR. aer_type=='scenario') THEN
	179	! Standard case
	180	filename='aerosols'
	181	type=aer_type
	182	ELSE IF (aer_type == 'mix1') THEN
	183	! Special case using a mix of decenal sulfate file and annual aerosols(all aerosols except sulfate)
	184	IF (name_aero(id_aero) == 'SO4') THEN
	185	filename='so4.run '
	186	type='scenario'
	187	ELSE
	188	filename='aerosols'
	189	type='annuel'
	190	END IF
	191	ELSE IF (aer_type == 'mix2') THEN
	192	! Special case using a mix of decenal sulfate file and natrual aerosols
	193	IF (name_aero(id_aero) == 'SO4') THEN
	194	filename='so4.run '
	195	type='scenario'
	196	ELSE
	197	filename='aerosols'
	198	type='preind'
	199	END IF
	200	ELSE
	201	CALL abort_gcm('readaerosol_interp', 'this aer_type not supported',1)
	202	END IF
	203
	204	CALL readaerosol(name_aero(id_aero), type, filename, iyr, klev_src, pt_ap, pt_b, pt_tmp, &
[1270]	205	psurf_year(:,:,id_aero), load_year(:,:,id_aero))
[1179]	206	IF (.NOT. ALLOCATED(var_year)) THEN
[1270]	207	ALLOCATE(var_year(klon, klev_src, 12, naero_spc), stat=ierr)
	208	IF (ierr /= 0) CALL abort_gcm('readaerosol_interp', 'pb in allocation 5',1)
[1179]	209	END IF
	210	var_year(:,:,:,id_aero) = pt_tmp(:,:,:)
	211
	212	! Reading values corresponding to the preindustrial concentrations.
[1492]	213	type='preind'
	214	CALL readaerosol(name_aero(id_aero), type, filename, iyr, pi_klev_src, pt_ap, pt_b, pt_tmp, &
[1270]	215	pi_psurf_year(:,:,id_aero), pi_load_year(:,:,id_aero))
[1179]	216
	217	! klev_src must be the same in both files.
	218	! Also supposing pt_ap and pt_b to be the same in the 2 files without testing.
	219	IF (pi_klev_src /= klev_src) THEN
	220	WRITE(lunout,*) 'Error! All forcing files for the same aerosol must have the same vertical dimension'
	221	WRITE(lunout,*) 'Aerosol : ', name_aero(id_aero)
	222	CALL abort_gcm('readaerosol_interp','Differnt vertical axes in aerosol forcing files',1)
	223	END IF
	224
	225	IF (.NOT. ALLOCATED(pi_var_year)) THEN
[1270]	226	ALLOCATE(pi_var_year(klon, klev_src, 12, naero_spc), stat=ierr)
	227	IF (ierr /= 0) CALL abort_gcm('readaerosol_interp', 'pb in allocation 6',1)
[1179]	228	END IF
	229	pi_var_year(:,:,:,id_aero) = pt_tmp(:,:,:)
	230
	231	IF (debug) THEN
[1270]	232	CALL writefield_phy('var_year_jan',var_year(:,:,1,id_aero),klev_src)
	233	CALL writefield_phy('var_year_dec',var_year(:,:,12,id_aero),klev_src)
[1179]	234	CALL writefield_phy('psurf_src',psurf_year(:,:,id_aero),1)
	235	CALL writefield_phy('pi_psurf_src',pi_psurf_year(:,:,id_aero),1)
	236	CALL writefield_phy('load_year_src',load_year(:,:,id_aero),1)
	237	CALL writefield_phy('pi_load_year_src',pi_load_year(:,:,id_aero),1)
	238	END IF
	239
	240	! Pointer no more useful, deallocate.
	241	DEALLOCATE(pt_tmp)
	242
	243	! Test if vertical interpolation will be needed.
	244	IF (psurf_year(1,1,id_aero)==not_valid .OR. pi_psurf_year(1,1,id_aero)==not_valid ) THEN
	245	! Pressure=not_valid indicates old file format, see module readaerosol
	246	vert_interp = .FALSE.
	247
	248	! If old file format, both psurf_year and pi_psurf_year must be not_valid
	249	IF ( psurf_year(1,1,id_aero) /= pi_psurf_year(1,1,id_aero) ) THEN
	250	WRITE(lunout,*) 'Warning! All forcing files for the same aerosol must have the same structure'
	251	CALL abort_gcm('readaerosol_interp', 'The aerosol files have not the same format',1)
	252	END IF
	253
	254	IF (klev /= klev_src) THEN
	255	WRITE(lunout,*) 'Old format of aerosol file do not allowed vertical interpolation'
	256	CALL abort_gcm('readaerosol_interp', 'Old aerosol file not possible',1)
	257	END IF
	258
	259	ELSE
	260	vert_interp = .TRUE.
	261	END IF
	262
[1265]	263	! Calendar initialisation
	264	!
	265	DO i = 2, 13
[1403]	266	month_len(i) = REAL(ioget_mon_len(year_cur, i-1))
[1265]	267	CALL ymds2ju(year_cur, i-1, 1, 0.0, month_start(i))
	268	ENDDO
[1403]	269	month_len(1) = REAL(ioget_mon_len(year_cur-1, 12))
[1265]	270	CALL ymds2ju(year_cur-1, 12, 1, 0.0, month_start(1))
[1403]	271	month_len(14) = REAL(ioget_mon_len(year_cur+1, 1))
[1265]	272	CALL ymds2ju(year_cur+1, 1, 1, 0.0, month_start(14))
	273	month_mid(:) = month_start (:) + month_len(:)/2.
[1273]	274
	275	if (debug) then
	276	write(lunout,*)' month_len = ',month_len
	277	write(lunout,*)' month_mid = ',month_mid
	278	endif
[1265]	279
[1246]	280	END IF ! IF ( (first .OR. iday==0) .AND. lnewday ) THEN
[1179]	281
	282	!****************************************************************************************
	283	! - 2) Interpolate to the actual day.
	284	! - 3) Interpolate to the model vertical grid.
	285	!
	286	!****************************************************************************************
	287
	288	IF (lnewday) THEN ! only if new day
	289	!****************************************************************************************
	290	! 2) Interpolate to the actual day
	291	!
	292	!****************************************************************************************
[1265]	293	! Find which months and days to use for time interpolation
[1270]	294	nbr_tsteps = 12
[1265]	295	IF (nbr_tsteps == 12) then
	296	IF (jDay < month_mid(im+1)) THEN
	297	im2=im-1
	298	day2 = month_mid(im2+1)
	299	day1 = month_mid(im+1)
	300	IF (im2 <= 0) THEN
	301	! the month is january, thus the month before december
	302	im2=12
	303	END IF
	304	ELSE
	305	! the second half of the month
	306	im2=im+1
	307	day2 = month_mid(im+1)
	308	day1 = month_mid(im2+1)
	309	IF (im2 > 12) THEN
	310	! the month is december, the following thus january
	311	im2=1
	312	ENDIF
	313	END IF
	314	ELSE IF (nbr_tsteps == 14) then
	315	im = im + 1
	316	IF (jDay < month_mid(im)) THEN
	317	! in the first half of the month use month before and actual month
	318	im2=im-1
	319	day2 = month_mid(im2)
	320	day1 = month_mid(im)
	321	ELSE
	322	! the second half of the month
	323	im2=im+1
	324	day2 = month_mid(im)
	325	day1 = month_mid(im2)
	326	END IF
[1179]	327	ELSE
[1265]	328	CALL abort_gcm('readaerosol_interp', 'number of months undefined',1)
	329	ENDIF
[1273]	330	if (debug) then
	331	write(lunout,*)' jDay, day1, day2, im, im2 = ', jDay, day1, day2, im, im2
	332	endif
[1265]	333
	334
[1179]	335	! Time interpolation, still on vertical source grid
	336	ALLOCATE(tmp1(klon,klev_src), tmp2(klon,klev_src),stat=ierr)
	337	IF (ierr /= 0) CALL abort_gcm('readaerosol_interp', 'pb in allocation 7',1)
	338
	339	ALLOCATE(pplay_src(klon,klev_src), stat=ierr)
	340	IF (ierr /= 0) CALL abort_gcm('readaerosol_interp', 'pb in allocation 8',1)
	341
	342
	343	DO k=1,klev_src
	344	DO i=1,klon
	345	tmp1(i,k) = &
[1269]	346	var_year(i,k,im2,id_aero) - (jDay-day2)/(day1-day2) * &
[1179]	347	(var_year(i,k,im2,id_aero) - var_year(i,k,im,id_aero))
	348
	349	tmp2(i,k) = &
[1269]	350	pi_var_year(i,k,im2,id_aero) - (jDay-day2)/(day1-day2) * &
[1179]	351	(pi_var_year(i,k,im2,id_aero) - pi_var_year(i,k,im,id_aero))
	352	END DO
	353	END DO
	354
	355	! Time interpolation for pressure at surface, still on vertical source grid
	356	DO i=1,klon
	357	psurf_day(i) = &
[1269]	358	psurf_year(i,im2,id_aero) - (jDay-day2)/(day1-day2) * &
[1179]	359	(psurf_year(i,im2,id_aero) - psurf_year(i,im,id_aero))
	360
	361	pi_psurf_day(i) = &
[1269]	362	pi_psurf_year(i,im2,id_aero) - (jDay-day2)/(day1-day2) * &
[1179]	363	(pi_psurf_year(i,im2,id_aero) - pi_psurf_year(i,im,id_aero))
	364	END DO
	365
	366	! Time interpolation for the load, still on vertical source grid
	367	DO i=1,klon
	368	load_src(i) = &
[1269]	369	load_year(i,im2,id_aero) - (jDay-day2)/(day1-day2) * &
[1179]	370	(load_year(i,im2,id_aero) - load_year(i,im,id_aero))
	371
	372	pi_load_src(i) = &
[1269]	373	pi_load_year(i,im2,id_aero) - (jDay-day2)/(day1-day2) * &
[1179]	374	(pi_load_year(i,im2,id_aero) - pi_load_year(i,im,id_aero))
	375	END DO
	376
	377	!****************************************************************************************
	378	! 3) Interpolate to the model vertical grid (target grid)
	379	!
	380	!****************************************************************************************
	381
	382	IF (vert_interp) THEN
	383
	384	! - Interpolate variable tmp1 (on source grid) to var_day (on target grid)
	385	!********************************************************************************
	386	! a) calculate pression at vertical levels for the source grid using the
	387	! hybrid-sigma coordinates ap and b and the surface pressure, variables from file.
	388	DO k = 1, klev_src
	389	DO i = 1, klon
	390	pplay_src(i,k)= pt_ap(k) + pt_b(k)*psurf_day(i)
	391	END DO
	392	END DO
	393
	394	IF (debug) THEN
	395	CALL writefield_phy('psurf_day_src',psurf_day(:),1)
	396	CALL writefield_phy('pplay_src',pplay_src(:,:),klev_src)
	397	CALL writefield_phy('pplay',pplay(:,:),klev)
	398	CALL writefield_phy('day_src',tmp1,klev_src)
	399	CALL writefield_phy('pi_day_src',tmp2,klev_src)
	400	END IF
	401
	402	! b) vertical interpolation on pressure leveles
	403	CALL pres2lev(tmp1(:,:), var_day(:,:,id_aero), klev_src, klev, pplay_src, pplay, &
	404	1, klon, .FALSE.)
	405
	406	IF (debug) CALL writefield_phy('day_tgt',var_day(:,:,id_aero),klev)
	407
	408	! c) adjust to conserve total aerosol mass load in the vertical pillar
	409	! Calculate the load in the actual pillar and compare with the load
	410	! read from aerosol file.
	411
	412	! Find the pressure difference in each model layer
	413	DO k = 1, klev
	414	DO i = 1, klon
	415	delp(i,k) = paprs(i,k) - paprs (i,k+1)
	416	END DO
	417	END DO
	418
	419	! Find the mass load in the actual pillar, on target grid
	420	load_tgt(:) = 0.
	421	DO k= 1, klev
	422	DO i = 1, klon
[1216]	423	zrho = pplay(i,k)/t_seri(i,k)/RD ! [kg/m3]
	424	volm = var_day(i,k,id_aero)*1.E-9/zrho ! [kg/kg]
	425	load_tgt(i) = load_tgt(i) + 1/RG * volm *delp(i,k)
[1179]	426	END DO
	427	END DO
	428
	429	! Adjust, uniform
	430	DO k = 1, klev
	431	DO i = 1, klon
	432	var_day(i,k,id_aero) = var_day(i,k,id_aero)*load_src(i)/load_tgt(i)
	433	END DO
	434	END DO
	435
	436	IF (debug) THEN
	437	load_tgt_test(:) = 0.
	438	DO k= 1, klev
	439	DO i = 1, klon
[1216]	440	zrho = pplay(i,k)/t_seri(i,k)/RD ! [kg/m3]
	441	volm = var_day(i,k,id_aero)*1.E-9/zrho ! [kg/kg]
	442	load_tgt_test(i) = load_tgt_test(i) + 1/RG * volm*delp(i,k)
[1179]	443	END DO
	444	END DO
	445
	446	CALL writefield_phy('day_tgt2',var_day(:,:,id_aero),klev)
	447	CALL writefield_phy('load_tgt',load_tgt(:),1)
	448	CALL writefield_phy('load_tgt_test',load_tgt_test(:),1)
	449	CALL writefield_phy('load_src',load_src(:),1)
	450	END IF
	451
	452	! - Interpolate variable tmp2 (source grid) to pi_var_day (target grid)
	453	!********************************************************************************
	454	! a) calculate pression at vertical levels at source grid
	455	DO k = 1, klev_src
	456	DO i = 1, klon
	457	pplay_src(i,k)= pt_ap(k) + pt_b(k)*pi_psurf_day(i)
	458	END DO
	459	END DO
	460
	461	IF (debug) THEN
	462	CALL writefield_phy('pi_psurf_day_src',pi_psurf_day(:),1)
	463	CALL writefield_phy('pi_pplay_src',pplay_src(:,:),klev_src)
	464	END IF
	465
	466	! b) vertical interpolation on pressure leveles
	467	CALL pres2lev(tmp2(:,:), pi_var_day(:,:,id_aero), klev_src, klev, pplay_src, pplay, &
	468	1, klon, .FALSE.)
	469
	470	IF (debug) CALL writefield_phy('pi_day_tgt',pi_var_day(:,:,id_aero),klev)
	471
	472	! c) adjust to conserve total aerosol mass load in the vertical pillar
	473	! Calculate the load in the actual pillar and compare with the load
	474	! read from aerosol file.
	475
	476	! Find the load in the actual pillar, on target grid
	477	load_tgt(:) = 0.
	478	DO k = 1, klev
	479	DO i = 1, klon
[1216]	480	zrho = pplay(i,k)/t_seri(i,k)/RD ! [kg/m3]
	481	volm = pi_var_day(i,k,id_aero)*1.E-9/zrho ! [kg/kg]
	482	load_tgt(i) = load_tgt(i) + 1/RG * volm * delp(i,k)
[1179]	483	END DO
	484	END DO
	485
	486	DO k = 1, klev
	487	DO i = 1, klon
	488	pi_var_day(i,k,id_aero) = pi_var_day(i,k,id_aero)*pi_load_src(i)/load_tgt(i)
	489	END DO
	490	END DO
	491
	492	IF (debug) THEN
	493	load_tgt_test(:) = 0.
	494	DO k = 1, klev
	495	DO i = 1, klon
[1216]	496	zrho = pplay(i,k)/t_seri(i,k)/RD ! [kg/m3]
	497	volm = pi_var_day(i,k,id_aero)*1.E-9/zrho ! [kg/kg]
	498	load_tgt_test(i) = load_tgt_test(i) + 1/RG * volm * delp(i,k)
[1179]	499	END DO
	500	END DO
	501	CALL writefield_phy('pi_day_tgt2',pi_var_day(:,:,id_aero),klev)
	502	CALL writefield_phy('pi_load_tgt',load_tgt(:),1)
	503	CALL writefield_phy('pi_load_tgt_test',load_tgt_test(:),1)
	504	CALL writefield_phy('pi_load_src',pi_load_src(:),1)
	505	END IF
	506
	507
	508	ELSE ! No vertical interpolation done
	509
	510	var_day(:,:,id_aero) = tmp1(:,:)
	511	pi_var_day(:,:,id_aero) = tmp2(:,:)
	512
	513	END IF ! vert_interp
	514
	515
	516	! Deallocation
	517	DEALLOCATE(tmp1, tmp2, pplay_src, stat=ierr)
	518
	519	!****************************************************************************************
	520	! 4) Test for negative mass values
	521	!
	522	!****************************************************************************************
	523	IF (MINVAL(var_day(:,:,id_aero)) < 0.) THEN
	524	DO k=1,klev
	525	DO i=1,klon
	526	! Test for var_day
	527	IF (var_day(i,k,id_aero) < 0.) THEN
[1265]	528	IF (jDay-day2 < 0.) WRITE(lunout,*) 'jDay-day2=',jDay-day2
[1179]	529	IF (var_year(i,k,im2,id_aero) - var_year(i,k,im,id_aero) < 0.) THEN
	530	WRITE(lunout,*) trim(name_aero(id_aero)),'(i,k,im2)-', &
	531	trim(name_aero(id_aero)),'(i,k,im)=', &
	532	var_year(i,k,im2,id_aero) - var_year(i,k,im,id_aero)
	533	END IF
	534	WRITE(lunout,*) 'stop for aerosol : ',name_aero(id_aero)
[1273]	535	WRITE(lunout,*) 'day1, day2, jDay = ', day1, day2, jDay
[1179]	536	CALL abort_gcm('readaerosol_interp','Error in interpolation 1',1)
	537	END IF
	538	END DO
	539	END DO
	540	END IF
	541
	542	IF (MINVAL(pi_var_day(:,:,id_aero)) < 0. ) THEN
	543	DO k=1, klev
	544	DO i=1,klon
	545	! Test for pi_var_day
	546	IF (pi_var_day(i,k,id_aero) < 0.) THEN
[1265]	547	IF (jDay-day2 < 0.) WRITE(lunout,*) 'jDay-day2=',jDay-day2
[1179]	548	IF (pi_var_year(i,k,im2,id_aero) - pi_var_year(i,k,im,id_aero) < 0.) THEN
	549	WRITE(lunout,*) trim(name_aero(id_aero)),'(i,k,im2)-', &
	550	trim(name_aero(id_aero)),'(i,k,im)=', &
	551	pi_var_year(i,k,im2,id_aero) - pi_var_year(i,k,im,id_aero)
	552	END IF
	553
	554	WRITE(lunout,*) 'stop for aerosol : ',name_aero(id_aero)
	555	CALL abort_gcm('readaerosol_interp','Error in interpolation 2',1)
	556	END IF
	557	END DO
	558	END DO
	559	END IF
	560
	561	END IF ! lnewday
	562
	563	!****************************************************************************************
	564	! Copy output from saved variables
	565	!
	566	!****************************************************************************************
	567
	568	mass_out(:,:) = var_day(:,:,id_aero)
	569	pi_mass_out(:,:) = pi_var_day(:,:,id_aero)
	570
	571	END SUBROUTINE readaerosol_interp

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