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traccoag_mod.F90 @ 5422

Last change on this file since 5422 was 5202, checked in by Laurent Fairhead, 3 months ago
Updating cirrus branch to trunk revision 5171
Property svn:keywords set to `Id`
File size: 19.4 KB

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[2690]	1	MODULE traccoag_mod
	2	!
	3	! This module calculates the concentration of aerosol particles in certain size bins
	4	! considering coagulation and sedimentation.
	5	!
	6	CONTAINS
	7
	8	SUBROUTINE traccoag(pdtphys, gmtime, debutphy, julien, &
	9	presnivs, xlat, xlon, pphis, pphi, &
[2752]	10	t_seri, pplay, paprs, sh, rh, tr_seri)
[5202]	11
[2752]	12	USE phys_local_var_mod, ONLY: mdw, R2SO4, DENSO4, f_r_wet, surf_PM25_sulf, &
[5202]	13	& budg_emi_ocs, budg_emi_so2, budg_emi_h2so4, budg_emi_part, &
	14	& R2SO4B, DENSO4B, f_r_wetB, sulfmmr, SAD_sulfate, sulfmmr_mode, nd_mode, reff_sulfate
	15
[2690]	16	USE dimphy
[4293]	17	USE infotrac_phy, ONLY : nbtr_bin, nbtr_sulgas, nbtr, id_SO2_strat
[2690]	18	USE aerophys
[3526]	19	USE geometry_mod, ONLY : cell_area, boundslat
[2690]	20	USE mod_grid_phy_lmdz
	21	USE mod_phys_lmdz_mpi_data, ONLY : is_mpi_root
	22	USE mod_phys_lmdz_para, only: gather, scatter
[4601]	23	USE phys_cal_mod, ONLY : year_len, year_cur, mth_cur, day_cur, hour
[2690]	24	USE sulfate_aer_mod
	25	USE phys_local_var_mod, ONLY: stratomask
	26	USE YOMCST
[3526]	27	USE print_control_mod, ONLY: lunout
[4601]	28	USE strataer_local_var_mod
	29
[2690]	30	IMPLICIT NONE
	31
	32	! Input argument
	33	!---------------
	34	REAL,INTENT(IN) :: pdtphys ! Pas d'integration pour la physique (seconde)
	35	REAL,INTENT(IN) :: gmtime ! Heure courante
	36	LOGICAL,INTENT(IN) :: debutphy ! le flag de l'initialisation de la physique
	37	INTEGER,INTENT(IN) :: julien ! Jour julien
	38
	39	REAL,DIMENSION(klev),INTENT(IN) :: presnivs! pressions approximat. des milieux couches (en PA)
	40	REAL,DIMENSION(klon),INTENT(IN) :: xlat ! latitudes pour chaque point
	41	REAL,DIMENSION(klon),INTENT(IN) :: xlon ! longitudes pour chaque point
	42	REAL,DIMENSION(klon),INTENT(IN) :: pphis ! geopotentiel du sol
	43	REAL,DIMENSION(klon,klev),INTENT(IN) :: pphi ! geopotentiel de chaque couche
	44
	45	REAL,DIMENSION(klon,klev),INTENT(IN) :: t_seri ! Temperature
	46	REAL,DIMENSION(klon,klev),INTENT(IN) :: pplay ! pression pour le mileu de chaque couche (en Pa)
	47	REAL,DIMENSION(klon,klev+1),INTENT(IN) :: paprs ! pression pour chaque inter-couche (en Pa)
	48	REAL,DIMENSION(klon,klev),INTENT(IN) :: sh ! humidite specifique
	49	REAL,DIMENSION(klon,klev),INTENT(IN) :: rh ! humidite relative
	50
	51	! Output argument
	52	!----------------
	53	REAL,DIMENSION(klon,klev,nbtr),INTENT(INOUT) :: tr_seri ! Concentration Traceur [U/KgA]
	54
	55	! Local variables
	56	!----------------
[3526]	57	REAL :: m_aer_emiss_vol_daily ! daily injection mass emission
[4601]	58	REAL :: m_aer ! aerosol mass
[5202]	59	INTEGER :: it, k, i, j, ilon, ilev, itime, i_int, ieru
[2690]	60	LOGICAL,DIMENSION(klon,klev) :: is_strato ! true = above tropopause, false = below
	61	REAL,DIMENSION(klon,klev) :: m_air_gridbox ! mass of air in every grid box [kg]
	62	REAL,DIMENSION(klon_glo,klev,nbtr) :: tr_seri_glo ! Concentration Traceur [U/KgA]
	63	REAL,DIMENSION(klev+1) :: altLMDz ! altitude of layer interfaces in m
	64	REAL,DIMENSION(klev) :: f_lay_emiss ! fraction of emission for every vertical layer
	65	REAL :: f_lay_sum ! sum of layer emission fractions
[2699]	66	REAL :: alt ! altitude for integral calculation
[2690]	67	INTEGER,PARAMETER :: n_int_alt=10 ! number of subintervals for integration over Gaussian emission profile
	68	REAL,DIMENSION(nbtr_bin) :: r_bin ! particle radius in size bin [m]
	69	REAL,DIMENSION(nbtr_bin) :: r_lower ! particle radius at lower bin boundary [m]
	70	REAL,DIMENSION(nbtr_bin) :: r_upper ! particle radius at upper bin boundary [m]
	71	REAL,DIMENSION(nbtr_bin) :: m_part_dry ! mass of one dry particle in size bin [kg]
	72	REAL :: zrho ! Density of air [kg/m3]
	73	REAL :: zdz ! thickness of atm. model layer in m
[2752]	74	REAL,DIMENSION(klev) :: zdm ! mass of atm. model layer in kg
[2690]	75	REAL,DIMENSION(klon,klev) :: dens_aer ! density of aerosol particles [kg/m3 aerosol] with default H2SO4 mass fraction
[2752]	76	REAL :: emission ! emission
[3526]	77	REAL :: theta_min, theta_max ! for SAI computation between two latitudes
	78	REAL :: dlat_loc
[4601]	79	REAL :: latmin,latmax,lonmin,lonmax ! lat/lon min/max for injection
	80	REAL :: sigma_alt, altemiss ! injection altitude + sigma for distrib
	81	REAL :: pdt,stretchlong ! physic timestep, stretch emission over one day
	82
[4513]	83	INTEGER :: injdur_sai ! injection duration for SAI case [days]
	84	INTEGER :: yr, is_bissext
[5202]	85	REAL :: samoment2, samoment3! 2nd and 3rd order moments of size distribution
[2690]	86
[4601]	87	IF (is_mpi_root .AND. flag_verbose_strataer) THEN
[3526]	88	WRITE(lunout,*) 'in traccoag: date from phys_cal_mod =',year_cur,'-',mth_cur,'-',day_cur,'-',hour
[4601]	89	WRITE(lunout,*) 'IN traccoag flag_emit: ',flag_emit
[2690]	90	ENDIF
[3526]	91
[5202]	92	! radius [m]
[2690]	93	DO it=1, nbtr_bin
	94	r_bin(it)=mdw(it)/2.
	95	ENDDO
	96
	97	!--set boundaries of size bins
	98	DO it=1, nbtr_bin
	99	IF (it.EQ.1) THEN
	100	r_upper(it)=sqrt(r_bin(it+1)*r_bin(it))
	101	r_lower(it)=r_bin(it)**2./r_upper(it)
	102	ELSEIF (it.EQ.nbtr_bin) THEN
	103	r_lower(it)=sqrt(r_bin(it)*r_bin(it-1))
	104	r_upper(it)=r_bin(it)**2./r_lower(it)
	105	ELSE
	106	r_lower(it)=sqrt(r_bin(it)*r_bin(it-1))
	107	r_upper(it)=sqrt(r_bin(it+1)*r_bin(it))
	108	ENDIF
	109	ENDDO
	110
	111	IF (debutphy .and. is_mpi_root) THEN
	112	DO it=1, nbtr_bin
[3526]	113	WRITE(lunout,*) 'radius bin', it, ':', r_bin(it), '(from', r_lower(it), 'to', r_upper(it), ')'
[2690]	114	ENDDO
	115	ENDIF
	116
	117	!--initialising logical is_strato from stratomask
	118	is_strato(:,:)=.FALSE.
[2695]	119	WHERE (stratomask.GT.0.5) is_strato=.TRUE.
[2690]	120
[4750]	121	IF(flag_new_strat_compo) THEN
[5202]	122	IF(debutphy) WRITE(lunout,*) 'traccoag: COMPO/DENSITY (Tabazadeh 97) + H2O kelvin effect', flag_new_strat_compo
	123	! STRACOMP (H2O, P, t_seri, R -> R2SO4 + Kelvin effect) : Taba97, Socol, etc...
	124	CALL stracomp_kelvin(sh,t_seri,pplay)
[4750]	125	ELSE
[5202]	126	IF(debutphy) WRITE(lunout,*) 'traccoag: COMPO from Bekki 2D model', flag_new_strat_compo
[4750]	127	! STRACOMP (H2O, P, t_seri -> aerosol composition (R2SO4))
	128	! H2SO4 mass fraction in aerosol (%)
	129	CALL stracomp(sh,t_seri,pplay)
	130
	131	! aerosol density (gr/cm3)
	132	CALL denh2sa(t_seri)
[5202]	133
	134	! compute factor for converting dry to wet radius (for every grid box)
	135	f_r_wet(:,:) = (dens_aer_dry/(DENSO4(:,:)1000.)/(R2SO4(:,:)/100.))*(1./3.)
[4750]	136	ENDIF
	137
[2690]	138	!--calculate mass of air in every grid box
	139	DO ilon=1, klon
[4601]	140	DO ilev=1, klev
	141	m_air_gridbox(ilon,ilev)=(paprs(ilon,ilev)-paprs(ilon,ilev+1))/RG*cell_area(ilon)
	142	ENDDO
[2690]	143	ENDDO
[4601]	144
[2752]	145	!--initialise emission diagnostics
[4769]	146	if (nErupt > 0 .and. (flag_emit == 1 .or. flag_emit == 4)) budg_emi(:,1)=0.0
[2752]	147	budg_emi_ocs(:)=0.0
	148	budg_emi_so2(:)=0.0
	149	budg_emi_h2so4(:)=0.0
	150	budg_emi_part(:)=0.0
	151
[4601]	152	!--sulfur emission, depending on chosen scenario (flag_emit)
	153	SELECT CASE(flag_emit)
[2690]	154
	155	CASE(0) ! background aerosol
	156	! do nothing (no emission)
	157
	158	CASE(1) ! volcanic eruption
	159	!--only emit on day of eruption
	160	! stretch emission over one day of Pinatubo eruption
[3526]	161	DO ieru=1, nErupt
	162	IF (year_cur==year_emit_vol(ieru).AND.mth_cur==mth_emit_vol(ieru).AND.&
	163	day_cur>=day_emit_vol(ieru).AND.day_cur<(day_emit_vol(ieru)+injdur)) THEN
[4601]	164
	165	! daily injection mass emission
	166	m_aer=m_aer_emiss_vol(ieru,1)/(REAL(injdur)*REAL(ponde_lonlat_vol(ieru)))
	167	!emission as SO2 gas (with m(SO2)=64/32*m_aer_emiss)
	168	m_aer=m_aer*(mSO2mol/mSatom)
	169
	170	WRITE(lunout,*) 'IN traccoag m_aer_emiss_vol(ieru)=',m_aer_emiss_vol(ieru,1), &
[3526]	171	'ponde_lonlat_vol(ieru)=',ponde_lonlat_vol(ieru),'(injdur*ponde_lonlat_vol(ieru))', &
[4601]	172	(injdur*ponde_lonlat_vol(ieru)),'m_aer_emiss_vol_daily=',m_aer,'ieru=',ieru
[3526]	173	WRITE(lunout,*) 'IN traccoag, dlon=',dlon
[4601]	174
	175	latmin=xlat_min_vol(ieru)
	176	latmax=xlat_max_vol(ieru)
	177	lonmin=xlon_min_vol(ieru)
	178	lonmax=xlon_max_vol(ieru)
	179	altemiss = altemiss_vol(ieru)
	180	sigma_alt = sigma_alt_vol(ieru)
	181	pdt=pdtphys
	182	! stretch emission over one day of eruption
	183	stretchlong = 1.
	184
	185	CALL STRATEMIT(pdtphys,pdt,xlat,xlon,t_seri,pplay,paprs,tr_seri,&
	186	m_aer,latmin,latmax,lonmin,lonmax,altemiss,sigma_alt,id_SO2_strat, &
	187	stretchlong,1,0)
	188
[3526]	189	ENDIF ! emission period
	190	ENDDO ! eruption number
	191
[2690]	192	CASE(2) ! stratospheric aerosol injections (SAI)
	193	!
[4513]	194	! Computing duration of SAI in days...
	195	! ... starting from 0...
	196	injdur_sai = 0
	197	! ... then adding whole years from first to (n-1)th...
	198	DO yr = year_emit_sai_start, year_emit_sai_end-1
	199	! (n % 4 == 0) and (n % 100 != 0 or n % 400 == 0)
	200	is_bissext = (MOD(yr,4)==0) .AND. (MOD(yr,100) /= 0 .OR. MOD(yr,400) == 0)
	201	injdur_sai = injdur_sai+365+is_bissext
	202	ENDDO
	203	! ... then subtracting part of the first year where no injection yet...
	204	is_bissext = (MOD(year_emit_sai_start,4)==0) .AND. (MOD(year_emit_sai_start,100) /= 0 .OR. MOD(year_emit_sai_start,400) == 0)
	205	SELECT CASE(mth_emit_sai_start)
	206	CASE(2)
	207	injdur_sai = injdur_sai-31
	208	CASE(3)
	209	injdur_sai = injdur_sai-31-28-is_bissext
	210	CASE(4)
	211	injdur_sai = injdur_sai-31-28-is_bissext-31
	212	CASE(5)
	213	injdur_sai = injdur_sai-31-28-is_bissext-31-30
	214	CASE(6)
	215	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31
	216	CASE(7)
	217	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30
	218	CASE(8)
	219	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31
	220	CASE(9)
	221	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31-31
	222	CASE(10)
	223	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31-31-30
	224	CASE(11)
	225	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31-31-30-31
	226	CASE(12)
	227	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31-31-30-31-30
	228	END SELECT
	229	injdur_sai = injdur_sai-day_emit_sai_start+1
	230	! ... then adding part of the n-th year
	231	is_bissext = (MOD(year_emit_sai_end,4)==0) .AND. (MOD(year_emit_sai_end,100) /= 0 .OR. MOD(year_emit_sai_end,400) == 0)
	232	SELECT CASE(mth_emit_sai_end)
	233	CASE(2)
	234	injdur_sai = injdur_sai+31
	235	CASE(3)
	236	injdur_sai = injdur_sai+31+28+is_bissext
	237	CASE(4)
	238	injdur_sai = injdur_sai+31+28+is_bissext+31
	239	CASE(5)
	240	injdur_sai = injdur_sai+31+28+is_bissext+31+30
	241	CASE(6)
	242	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31
	243	CASE(7)
	244	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30
	245	CASE(8)
	246	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31
	247	CASE(9)
	248	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31+31
	249	CASE(10)
	250	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31+31+30
	251	CASE(11)
	252	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31+31+30+31
	253	CASE(12)
	254	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31+31+30+31+30
	255	END SELECT
	256	injdur_sai = injdur_sai+day_emit_sai_end
	257	! A security: are SAI dates of injection consistent?
	258	IF (injdur_sai <= 0) THEN
	259	CALL abort_physic('traccoag_mod', 'Pb in SAI dates of injection.',1)
	260	ENDIF
	261	! Injection in itself
	262	IF (( year_emit_sai_start <= year_cur ) &
	263	.AND. ( year_cur <= year_emit_sai_end ) &
	264	.AND. ( mth_emit_sai_start <= mth_cur .OR. year_emit_sai_start < year_cur ) &
	265	.AND. ( mth_cur <= mth_emit_sai_end .OR. year_cur < year_emit_sai_end ) &
	266	.AND. ( day_emit_sai_start <= day_cur .OR. mth_emit_sai_start < mth_cur .OR. year_emit_sai_start < year_cur ) &
	267	.AND. ( day_cur <= day_emit_sai_end .OR. mth_cur < mth_emit_sai_end .OR. year_cur < year_emit_sai_end )) THEN
[4601]	268
	269	m_aer=m_aer_emiss_sai
	270	!emission as SO2 gas (with m(SO2)=64/32*m_aer_emiss)
	271	m_aer=m_aer*(mSO2mol/mSatom)
	272
	273	latmin=xlat_sai
	274	latmax=xlat_sai
	275	lonmin=xlon_sai
	276	lonmax=xlon_sai
	277	altemiss = altemiss_sai
	278	sigma_alt = sigma_alt_sai
	279	pdt=0.
	280	! stretch emission over whole year (360d)
	281	stretchlong=FLOAT(year_len)
	282
	283	CALL STRATEMIT(pdtphys,pdt,xlat,xlon,t_seri,pplay,paprs,m_air_gridbox,tr_seri,&
	284	m_aer,latmin,latmax,lonmin,lonmax,altemiss,sigma_alt,id_SO2_strat, &
	285	stretchlong,1,0)
	286
	287	budg_emi_so2(:) = budg_emi(:,1)*mSatom/mSO2mol
[4513]	288	ENDIF ! Condition over injection dates
	289
[3526]	290	CASE(3) ! --- SAI injection over a single band of longitude and between
	291	! lat_min and lat_max
	292
[4601]	293	m_aer=m_aer_emiss_sai
	294	!emission as SO2 gas (with m(SO2)=64/32*m_aer_emiss)
	295	m_aer=m_aer*(mSO2mol/mSatom)
[3526]	296
[4601]	297	latmin=xlat_min_sai
	298	latmax=xlat_max_sai
	299	lonmin=xlon_sai
	300	lonmax=xlon_sai
	301	altemiss = altemiss_sai
	302	sigma_alt = sigma_alt_sai
	303	pdt=0.
	304	! stretch emission over whole year (360d)
	305	stretchlong=FLOAT(year_len)
[3526]	306
[4601]	307	CALL STRATEMIT(pdtphys,pdt,xlat,xlon,t_seri,pplay,paprs,m_air_gridbox,tr_seri,&
	308	m_aer,latmin,latmax,lonmin,lonmax,altemiss,sigma_alt,id_SO2_strat, &
	309	stretchlong,1,0)
[3526]	310
[4601]	311	budg_emi_so2(:) = budg_emi(:,1)*mSatom/mSO2mol
	312
	313	END SELECT ! emission scenario (flag_emit)
[3526]	314
[2690]	315	!--read background concentrations of OCS and SO2 and lifetimes from input file
[2695]	316	!--update the variables defined in phys_local_var_mod
	317	CALL interp_sulf_input(debutphy,pdtphys,paprs,tr_seri)
[2690]	318
	319	!--convert OCS to SO2 in the stratosphere
[2752]	320	CALL ocs_to_so2(pdtphys,tr_seri,t_seri,pplay,paprs,is_strato)
[2690]	321
	322	!--convert SO2 to H2SO4
[2752]	323	CALL so2_to_h2so4(pdtphys,tr_seri,t_seri,pplay,paprs,is_strato)
[2690]	324
	325	!--common routine for nucleation and condensation/evaporation with adaptive timestep
	326	CALL micphy_tstep(pdtphys,tr_seri,t_seri,pplay,paprs,rh,is_strato)
	327
	328	!--call coagulation routine
	329	CALL coagulate(pdtphys,mdw,tr_seri,t_seri,pplay,dens_aer,is_strato)
	330
[4601]	331	!--call sedimentation routine
[2690]	332	CALL aer_sedimnt(pdtphys, t_seri, pplay, paprs, tr_seri, dens_aer)
	333
	334	!--compute mass concentration of PM2.5 sulfate particles (wet diameter and mass) at the surface for health studies
	335	surf_PM25_sulf(:)=0.0
	336	DO i=1,klon
	337	DO it=1, nbtr_bin
	338	IF (mdw(it) .LT. 2.5e-6) THEN
	339	!surf_PM25_sulf(i)=surf_PM25_sulf(i)+tr_seri(i,1,it+nbtr_sulgas)*m_part(i,1,it) &
[3526]	340	!assume that particles consist of ammonium sulfate at the surface (132g/mol)
	341	!and are dry at T = 20 deg. C and 50 perc. humidity
[2690]	342	surf_PM25_sulf(i)=surf_PM25_sulf(i)+tr_seri(i,1,it+nbtr_sulgas) &
	343	& 132./98.dens_aer_dry4./3.RPI(mdw(it)/2.)*3 &
[2752]	344	& pplay(i,1)/t_seri(i,1)/RD1.e9
[2690]	345	ENDIF
	346	ENDDO
	347	ENDDO
[4601]	348
[5202]	349	!--compute
	350	! sulfmmr: Sulfate aerosol concentration (dry mixing ratio) (condensed H2SO4 mmr)
	351	! SAD_sulfate: SAD all aerosols (cm2/cm3) (must be WET)
	352	! sulfmmr_mode: sulfate(=H2SO4 if dry) MMR in different modes (ambiguous but based on sulfmmr, it mus be DRY(?) mmr)
	353	! nd_mode: DRY(?) particle concentration in different modes (part/m3)
	354	sulfmmr(:,:)=0.0
	355	SAD_sulfate(:,:)=0.0
	356	sulfmmr_mode(:,:,:)=0.0
	357	nd_mode(:,:,:)=0.0
	358	reff_sulfate(:,:)=0.0
	359
	360	DO i=1,klon
	361	DO j=1,klev
	362	samoment2=0.0
	363	samoment3=0.0
	364	DO it=1, nbtr_bin
	365	!surf_PM25_sulf(i)=surf_PM25_sulf(i)+tr_seri(i,1,it+nbtr_sulgas)*m_part(i,1,it) &
	366	!assume that particles consist of ammonium sulfate at the surface (132g/mol)
	367	!and are dry at T = 20 deg. C and 50 perc. humidity
	368
	369	! sulfmmr_mode: sulfate(=H2SO4 if dry) MMR in different modes (based on sulfmmr, it must be DRY mmr)
	370	! equivalent to condensed H2SO4 mmr= H2SO4 kg / kgA in bin it
	371	sulfmmr_mode(i,j,it) = tr_seri(i,j,it+nbtr_sulgas) & ! [DRY part/kgA in bin it]
	372	& (4./3.)RPI(mdw(it)/2.)*3. & ! [mdw: dry diameter in m]
	373	& *dens_aer_dry ! [dry aerosol mass density in kg/m3]
	374
	375	! sulfmmr: Sulfate aerosol concentration (dry mass mixing ratio)
	376	! equivalent to total condensed H2SO4 mmr (H2SO4 kg / kgA
	377	sulfmmr(i,j) = sulfmmr(i,j) + sulfmmr_mode(i,j,it)
	378
	379	! nd_mode: particle concentration in different modes (DRY part/m3)
	380	nd_mode(i,j,it) = tr_seri(i,j,it+nbtr_sulgas) & ! [DRY part/kgA in bin it]
	381	& *pplay(i,j)/t_seri(i,j)/RD ! [air mass concentration in kg air /m3A]
	382
	383	IF(flag_new_strat_compo) THEN
	384	! SAD_sulfate: SAD WET sulfate aerosols (cm2/cm3)
	385	SAD_sulfate(i,j) = SAD_sulfate(i,j) + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
	386	& 4.RPI( mdw(it)f_r_wetB(i,j,it)/2. )**2. & ! [WET SA of part it in m2]
	387	& *1.e-2 ! conversion from m2/m3 to cm2/cm3A
	388	! samoment2 : 2nd order moment of WET sulfate aerosols (m2/m3)
	389	samoment2 = samoment2 + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
	390	& ( mdw(it)f_r_wetB(i,j,it)/2. )**2. ! [WET SA of part it in m2]
	391	! samoment3 : 3nd order moment of WET sulfate aerosols (cm2/cm3)
	392	samoment3 = samoment3 + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
	393	& ( mdw(it)f_r_wetB(i,j,it)/2. )**3. ! [WET SA of part it in m2]
	394	ELSE
	395	! SAD_sulfate: SAD WET sulfate aerosols (cm2/cm3)
	396	SAD_sulfate(i,j) = SAD_sulfate(i,j) + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
	397	& 4.RPI( mdw(it)f_r_wet(i,j)/2. )**2. & ! [WET SA of part it in m2]
	398	& *1.e-2 ! conversion from m2/m3 to cm2/cm3A
	399	! samoment2 : 2nd order moment of WET sulfate aerosols (m2/m3)
	400	samoment2 = samoment2 + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
	401	& ( mdw(it)f_r_wet(i,j)/2. )**2. ! [WET SA of part it in m2]
	402	! samoment3 : 3nd order moment of WET sulfate aerosols (cm2/cm3)
	403	samoment3 = samoment3 + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
	404	& ( mdw(it)f_r_wet(i,j)/2. )**3. ! [WET SA of part it in m2]
	405	ENDIF
	406	ENDDO
	407	! reff_sulfate: effective radius of WET sulfate aerosols (cm)
	408	reff_sulfate(i,j) = (samoment3 / samoment2) &
	409	& *1.e2 ! conversion from m to cm
	410	ENDDO
	411	ENDDO
	412
[2690]	413	END SUBROUTINE traccoag
	414
	415	END MODULE traccoag_mod

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