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traccoag_mod.f90 @ 5367

Last change on this file since 5367 was 5367, checked in by abarral, 10 days ago
(WIP) Turn implicit into explicit declarations
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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	IMPLICIT NONE; PRIVATE
7	PUBLIC traccoag
8	CONTAINS
9
10	SUBROUTINE traccoag(pdtphys, gmtime, debutphy, julien, &
11	presnivs, xlat, xlon, pphis, pphi, &
12	t_seri, pplay, paprs, sh, rh, tr_seri)
13
14	USE phys_local_var_mod, ONLY: mdw, R2SO4, DENSO4, f_r_wet, surf_PM25_sulf, &
15	& budg_emi_ocs, budg_emi_so2, budg_emi_h2so4, budg_emi_part, &
16	& R2SO4B, DENSO4B, f_r_wetB, sulfmmr, SAD_sulfate, sulfmmr_mode, nd_mode, reff_sulfate
17
18	USE dimphy
19	USE infotrac_phy, ONLY : nbtr_bin, nbtr_sulgas, nbtr, id_SO2_strat
20	USE aerophys
21	USE geometry_mod, ONLY : cell_area, boundslat
22	USE mod_grid_phy_lmdz
23	USE mod_phys_lmdz_mpi_data, ONLY : is_mpi_root
24	USE mod_phys_lmdz_para, only: gather, scatter
25	USE phys_cal_mod, ONLY : year_len, year_cur, mth_cur, day_cur, hour
26	USE sulfate_aer_mod
27	USE phys_local_var_mod, ONLY: stratomask
28	USE yomcst_mod_h
29	USE print_control_mod, ONLY: lunout
30	USE strataer_local_var_mod
31
32	IMPLICIT NONE
33
34	! Input argument
35	!---------------
36	REAL,INTENT(IN) :: pdtphys ! Pas d'integration pour la physique (seconde)
37	REAL,INTENT(IN) :: gmtime ! Heure courante
38	LOGICAL,INTENT(IN) :: debutphy ! le flag de l'initialisation de la physique
39	INTEGER,INTENT(IN) :: julien ! Jour julien
40
41	REAL,DIMENSION(klev),INTENT(IN) :: presnivs! pressions approximat. des milieux couches (en PA)
42	REAL,DIMENSION(klon),INTENT(IN) :: xlat ! latitudes pour chaque point
43	REAL,DIMENSION(klon),INTENT(IN) :: xlon ! longitudes pour chaque point
44	REAL,DIMENSION(klon),INTENT(IN) :: pphis ! geopotentiel du sol
45	REAL,DIMENSION(klon,klev),INTENT(IN) :: pphi ! geopotentiel de chaque couche
46
47	REAL,DIMENSION(klon,klev),INTENT(IN) :: t_seri ! Temperature
48	REAL,DIMENSION(klon,klev),INTENT(IN) :: pplay ! pression pour le mileu de chaque couche (en Pa)
49	REAL,DIMENSION(klon,klev+1),INTENT(IN) :: paprs ! pression pour chaque inter-couche (en Pa)
50	REAL,DIMENSION(klon,klev),INTENT(IN) :: sh ! humidite specifique
51	REAL,DIMENSION(klon,klev),INTENT(IN) :: rh ! humidite relative
52
53	! Output argument
54	!----------------
55	REAL,DIMENSION(klon,klev,nbtr),INTENT(INOUT) :: tr_seri ! Concentration Traceur [U/KgA]
56
57	! Local variables
58	!----------------
59	REAL :: m_aer_emiss_vol_daily ! daily injection mass emission
60	REAL :: m_aer ! aerosol mass
61	INTEGER :: it, k, i, j, ilon, ilev, itime, i_int, ieru
62	LOGICAL,DIMENSION(klon,klev) :: is_strato ! true = above tropopause, false = below
63	REAL,DIMENSION(klon,klev) :: m_air_gridbox ! mass of air in every grid box [kg]
64	REAL,DIMENSION(klon_glo,klev,nbtr) :: tr_seri_glo ! Concentration Traceur [U/KgA]
65	REAL,DIMENSION(klev+1) :: altLMDz ! altitude of layer interfaces in m
66	REAL,DIMENSION(klev) :: f_lay_emiss ! fraction of emission for every vertical layer
67	REAL :: f_lay_sum ! sum of layer emission fractions
68	REAL :: alt ! altitude for integral calculation
69	INTEGER,PARAMETER :: n_int_alt=10 ! number of subintervals for integration over Gaussian emission profile
70	REAL,DIMENSION(nbtr_bin) :: r_bin ! particle radius in size bin [m]
71	REAL,DIMENSION(nbtr_bin) :: r_lower ! particle radius at lower bin boundary [m]
72	REAL,DIMENSION(nbtr_bin) :: r_upper ! particle radius at upper bin boundary [m]
73	REAL,DIMENSION(nbtr_bin) :: m_part_dry ! mass of one dry particle in size bin [kg]
74	REAL :: zrho ! Density of air [kg/m3]
75	REAL :: zdz ! thickness of atm. model layer in m
76	REAL,DIMENSION(klev) :: zdm ! mass of atm. model layer in kg
77	REAL,DIMENSION(klon,klev) :: dens_aer ! density of aerosol particles [kg/m3 aerosol] with default H2SO4 mass fraction
78	REAL :: emission ! emission
79	REAL :: theta_min, theta_max ! for SAI computation between two latitudes
80	REAL :: dlat_loc
81	REAL :: latmin,latmax,lonmin,lonmax ! lat/lon min/max for injection
82	REAL :: sigma_alt, altemiss ! injection altitude + sigma for distrib
83	REAL :: pdt,stretchlong ! physic timestep, stretch emission over one day
84
85	INTEGER :: injdur_sai ! injection duration for SAI case [days]
86	INTEGER :: yr, is_bissext
87	REAL :: samoment2, samoment3! 2nd and 3rd order moments of size distribution
88
89	IF (is_mpi_root .AND. flag_verbose_strataer) THEN
90	WRITE(lunout,*) 'in traccoag: date from phys_cal_mod =',year_cur,'-',mth_cur,'-',day_cur,'-',hour
91	WRITE(lunout,*) 'IN traccoag flag_emit: ',flag_emit
92	ENDIF
93
94	! radius [m]
95	DO it=1, nbtr_bin
96	r_bin(it)=mdw(it)/2.
97	ENDDO
98
99	!--set boundaries of size bins
100	DO it=1, nbtr_bin
101	IF (it.EQ.1) THEN
102	r_upper(it)=sqrt(r_bin(it+1)*r_bin(it))
103	r_lower(it)=r_bin(it)**2./r_upper(it)
104	ELSEIF (it.EQ.nbtr_bin) THEN
105	r_lower(it)=sqrt(r_bin(it)*r_bin(it-1))
106	r_upper(it)=r_bin(it)**2./r_lower(it)
107	ELSE
108	r_lower(it)=sqrt(r_bin(it)*r_bin(it-1))
109	r_upper(it)=sqrt(r_bin(it+1)*r_bin(it))
110	ENDIF
111	ENDDO
112
113	IF (debutphy .and. is_mpi_root) THEN
114	DO it=1, nbtr_bin
115	WRITE(lunout,*) 'radius bin', it, ':', r_bin(it), '(from', r_lower(it), 'to', r_upper(it), ')'
116	ENDDO
117	ENDIF
118
119	!--initialising logical is_strato from stratomask
120	is_strato(:,:)=.FALSE.
121	WHERE (stratomask.GT.0.5) is_strato=.TRUE.
122
123	IF(flag_new_strat_compo) THEN
124	IF(debutphy) WRITE(lunout,*) 'traccoag: COMPO/DENSITY (Tabazadeh 97) + H2O kelvin effect', flag_new_strat_compo
125	! STRACOMP (H2O, P, t_seri, R -> R2SO4 + Kelvin effect) : Taba97, Socol, etc...
126	CALL stracomp_kelvin(sh,t_seri,pplay)
127	ELSE
128	IF(debutphy) WRITE(lunout,*) 'traccoag: COMPO from Bekki 2D model', flag_new_strat_compo
129	! STRACOMP (H2O, P, t_seri -> aerosol composition (R2SO4))
130	! H2SO4 mass fraction in aerosol (%)
131	CALL stracomp(sh,t_seri,pplay)
132
133	! aerosol density (gr/cm3)
134	CALL denh2sa(t_seri)
135
136	! compute factor for converting dry to wet radius (for every grid box)
137	f_r_wet(:,:) = (dens_aer_dry/(DENSO4(:,:)1000.)/(R2SO4(:,:)/100.))*(1./3.)
138	ENDIF
139
140	!--calculate mass of air in every grid box
141	DO ilon=1, klon
142	DO ilev=1, klev
143	m_air_gridbox(ilon,ilev)=(paprs(ilon,ilev)-paprs(ilon,ilev+1))/RG*cell_area(ilon)
144	ENDDO
145	ENDDO
146
147	!--initialise emission diagnostics
148	if (nErupt > 0 .and. (flag_emit == 1 .or. flag_emit == 4)) budg_emi(:,1)=0.0
149	budg_emi_ocs(:)=0.0
150	budg_emi_so2(:)=0.0
151	budg_emi_h2so4(:)=0.0
152	budg_emi_part(:)=0.0
153
154	!--sulfur emission, depending on chosen scenario (flag_emit)
155	SELECT CASE(flag_emit)
156
157	CASE(0) ! background aerosol
158	! do nothing (no emission)
159
160	CASE(1) ! volcanic eruption
161	!--only emit on day of eruption
162	! stretch emission over one day of Pinatubo eruption
163	DO ieru=1, nErupt
164	IF (year_cur==year_emit_vol(ieru).AND.mth_cur==mth_emit_vol(ieru).AND.&
165	day_cur>=day_emit_vol(ieru).AND.day_cur<(day_emit_vol(ieru)+injdur)) THEN
166
167	! daily injection mass emission
168	m_aer=m_aer_emiss_vol(ieru,1)/(REAL(injdur)*REAL(ponde_lonlat_vol(ieru)))
169	!emission as SO2 gas (with m(SO2)=64/32*m_aer_emiss)
170	m_aer=m_aer*(mSO2mol/mSatom)
171
172	WRITE(lunout,*) 'IN traccoag m_aer_emiss_vol(ieru)=',m_aer_emiss_vol(ieru,1), &
173	'ponde_lonlat_vol(ieru)=',ponde_lonlat_vol(ieru),'(injdur*ponde_lonlat_vol(ieru))', &
174	(injdur*ponde_lonlat_vol(ieru)),'m_aer_emiss_vol_daily=',m_aer,'ieru=',ieru
175	WRITE(lunout,*) 'IN traccoag, dlon=',dlon
176
177	latmin=xlat_min_vol(ieru)
178	latmax=xlat_max_vol(ieru)
179	lonmin=xlon_min_vol(ieru)
180	lonmax=xlon_max_vol(ieru)
181	altemiss = altemiss_vol(ieru)
182	sigma_alt = sigma_alt_vol(ieru)
183	pdt=pdtphys
184	! stretch emission over one day of eruption
185	stretchlong = 1.
186
187	CALL STRATEMIT(pdtphys,pdt,xlat,xlon,t_seri,pplay,paprs,tr_seri,&
188	m_aer,latmin,latmax,lonmin,lonmax,altemiss,sigma_alt,id_SO2_strat, &
189	stretchlong,1,0)
190
191	ENDIF ! emission period
192	ENDDO ! eruption number
193
194	CASE(2) ! stratospheric aerosol injections (SAI)
195	!
196	! Computing duration of SAI in days...
197	! ... starting from 0...
198	injdur_sai = 0
199	! ... then adding whole years from first to (n-1)th...
200	DO yr = year_emit_sai_start, year_emit_sai_end-1
201	! (n % 4 == 0) and (n % 100 != 0 or n % 400 == 0)
202	is_bissext = (MOD(yr,4)==0) .AND. (MOD(yr,100) /= 0 .OR. MOD(yr,400) == 0)
203	injdur_sai = injdur_sai+365+is_bissext
204	ENDDO
205	! ... then subtracting part of the first year where no injection yet...
206	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)
207	SELECT CASE(mth_emit_sai_start)
208	CASE(2)
209	injdur_sai = injdur_sai-31
210	CASE(3)
211	injdur_sai = injdur_sai-31-28-is_bissext
212	CASE(4)
213	injdur_sai = injdur_sai-31-28-is_bissext-31
214	CASE(5)
215	injdur_sai = injdur_sai-31-28-is_bissext-31-30
216	CASE(6)
217	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31
218	CASE(7)
219	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30
220	CASE(8)
221	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31
222	CASE(9)
223	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31-31
224	CASE(10)
225	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31-31-30
226	CASE(11)
227	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31-31-30-31
228	CASE(12)
229	injdur_sai = injdur_sai-31-28-is_bissext-31-30-31-30-31-31-30-31-30
230	END SELECT
231	injdur_sai = injdur_sai-day_emit_sai_start+1
232	! ... then adding part of the n-th year
233	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)
234	SELECT CASE(mth_emit_sai_end)
235	CASE(2)
236	injdur_sai = injdur_sai+31
237	CASE(3)
238	injdur_sai = injdur_sai+31+28+is_bissext
239	CASE(4)
240	injdur_sai = injdur_sai+31+28+is_bissext+31
241	CASE(5)
242	injdur_sai = injdur_sai+31+28+is_bissext+31+30
243	CASE(6)
244	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31
245	CASE(7)
246	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30
247	CASE(8)
248	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31
249	CASE(9)
250	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31+31
251	CASE(10)
252	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31+31+30
253	CASE(11)
254	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31+31+30+31
255	CASE(12)
256	injdur_sai = injdur_sai+31+28+is_bissext+31+30+31+30+31+31+30+31+30
257	END SELECT
258	injdur_sai = injdur_sai+day_emit_sai_end
259	! A security: are SAI dates of injection consistent?
260	IF (injdur_sai <= 0) THEN
261	CALL abort_physic('traccoag_mod', 'Pb in SAI dates of injection.',1)
262	ENDIF
263	! Injection in itself
264	IF (( year_emit_sai_start <= year_cur ) &
265	.AND. ( year_cur <= year_emit_sai_end ) &
266	.AND. ( mth_emit_sai_start <= mth_cur .OR. year_emit_sai_start < year_cur ) &
267	.AND. ( mth_cur <= mth_emit_sai_end .OR. year_cur < year_emit_sai_end ) &
268	.AND. ( day_emit_sai_start <= day_cur .OR. mth_emit_sai_start < mth_cur .OR. year_emit_sai_start < year_cur ) &
269	.AND. ( day_cur <= day_emit_sai_end .OR. mth_cur < mth_emit_sai_end .OR. year_cur < year_emit_sai_end )) THEN
270
271	m_aer=m_aer_emiss_sai
272	!emission as SO2 gas (with m(SO2)=64/32*m_aer_emiss)
273	m_aer=m_aer*(mSO2mol/mSatom)
274
275	latmin=xlat_sai
276	latmax=xlat_sai
277	lonmin=xlon_sai
278	lonmax=xlon_sai
279	altemiss = altemiss_sai
280	sigma_alt = sigma_alt_sai
281	pdt=0.
282	! stretch emission over whole year (360d)
283	stretchlong=FLOAT(year_len)
284
285	CALL STRATEMIT(pdtphys,pdt,xlat,xlon,t_seri,pplay,paprs,m_air_gridbox,tr_seri,&
286	m_aer,latmin,latmax,lonmin,lonmax,altemiss,sigma_alt,id_SO2_strat, &
287	stretchlong,1,0)
288
289	budg_emi_so2(:) = budg_emi(:,1)*mSatom/mSO2mol
290	ENDIF ! Condition over injection dates
291
292	CASE(3) ! --- SAI injection over a single band of longitude and between
293	! lat_min and lat_max
294
295	m_aer=m_aer_emiss_sai
296	!emission as SO2 gas (with m(SO2)=64/32*m_aer_emiss)
297	m_aer=m_aer*(mSO2mol/mSatom)
298
299	latmin=xlat_min_sai
300	latmax=xlat_max_sai
301	lonmin=xlon_sai
302	lonmax=xlon_sai
303	altemiss = altemiss_sai
304	sigma_alt = sigma_alt_sai
305	pdt=0.
306	! stretch emission over whole year (360d)
307	stretchlong=FLOAT(year_len)
308
309	CALL STRATEMIT(pdtphys,pdt,xlat,xlon,t_seri,pplay,paprs,m_air_gridbox,tr_seri,&
310	m_aer,latmin,latmax,lonmin,lonmax,altemiss,sigma_alt,id_SO2_strat, &
311	stretchlong,1,0)
312
313	budg_emi_so2(:) = budg_emi(:,1)*mSatom/mSO2mol
314
315	END SELECT ! emission scenario (flag_emit)
316
317	!--read background concentrations of OCS and SO2 and lifetimes from input file
318	!--update the variables defined in phys_local_var_mod
319	CALL interp_sulf_input(debutphy,pdtphys,paprs,tr_seri)
320
321	!--convert OCS to SO2 in the stratosphere
322	CALL ocs_to_so2(pdtphys,tr_seri,t_seri,pplay,paprs,is_strato)
323
324	!--convert SO2 to H2SO4
325	CALL so2_to_h2so4(pdtphys,tr_seri,t_seri,pplay,paprs,is_strato)
326
327	!--common routine for nucleation and condensation/evaporation with adaptive timestep
328	CALL micphy_tstep(pdtphys,tr_seri,t_seri,pplay,paprs,rh,is_strato)
329
330	!--call coagulation routine
331	CALL coagulate(pdtphys,mdw,tr_seri,t_seri,pplay,dens_aer,is_strato)
332
333	!--call sedimentation routine
334	CALL aer_sedimnt(pdtphys, t_seri, pplay, paprs, tr_seri, dens_aer)
335
336	!--compute mass concentration of PM2.5 sulfate particles (wet diameter and mass) at the surface for health studies
337	surf_PM25_sulf(:)=0.0
338	DO i=1,klon
339	DO it=1, nbtr_bin
340	IF (mdw(it) .LT. 2.5e-6) THEN
341	!surf_PM25_sulf(i)=surf_PM25_sulf(i)+tr_seri(i,1,it+nbtr_sulgas)*m_part(i,1,it) &
342	!assume that particles consist of ammonium sulfate at the surface (132g/mol)
343	!and are dry at T = 20 deg. C and 50 perc. humidity
344	surf_PM25_sulf(i)=surf_PM25_sulf(i)+tr_seri(i,1,it+nbtr_sulgas) &
345	& 132./98.dens_aer_dry4./3.RPI(mdw(it)/2.)*3 &
346	& pplay(i,1)/t_seri(i,1)/RD1.e9
347	ENDIF
348	ENDDO
349	ENDDO
350
351	!--compute
352	! sulfmmr: Sulfate aerosol concentration (dry mixing ratio) (condensed H2SO4 mmr)
353	! SAD_sulfate: SAD all aerosols (cm2/cm3) (must be WET)
354	! sulfmmr_mode: sulfate(=H2SO4 if dry) MMR in different modes (ambiguous but based on sulfmmr, it mus be DRY(?) mmr)
355	! nd_mode: DRY(?) particle concentration in different modes (part/m3)
356	sulfmmr(:,:)=0.0
357	SAD_sulfate(:,:)=0.0
358	sulfmmr_mode(:,:,:)=0.0
359	nd_mode(:,:,:)=0.0
360	reff_sulfate(:,:)=0.0
361
362	DO i=1,klon
363	DO j=1,klev
364	samoment2=0.0
365	samoment3=0.0
366	DO it=1, nbtr_bin
367	!surf_PM25_sulf(i)=surf_PM25_sulf(i)+tr_seri(i,1,it+nbtr_sulgas)*m_part(i,1,it) &
368	!assume that particles consist of ammonium sulfate at the surface (132g/mol)
369	!and are dry at T = 20 deg. C and 50 perc. humidity
370
371	! sulfmmr_mode: sulfate(=H2SO4 if dry) MMR in different modes (based on sulfmmr, it must be DRY mmr)
372	! equivalent to condensed H2SO4 mmr= H2SO4 kg / kgA in bin it
373	sulfmmr_mode(i,j,it) = tr_seri(i,j,it+nbtr_sulgas) & ! [DRY part/kgA in bin it]
374	& (4./3.)RPI(mdw(it)/2.)*3. & ! [mdw: dry diameter in m]
375	& *dens_aer_dry ! [dry aerosol mass density in kg/m3]
376
377	! sulfmmr: Sulfate aerosol concentration (dry mass mixing ratio)
378	! equivalent to total condensed H2SO4 mmr (H2SO4 kg / kgA
379	sulfmmr(i,j) = sulfmmr(i,j) + sulfmmr_mode(i,j,it)
380
381	! nd_mode: particle concentration in different modes (DRY part/m3)
382	nd_mode(i,j,it) = tr_seri(i,j,it+nbtr_sulgas) & ! [DRY part/kgA in bin it]
383	& *pplay(i,j)/t_seri(i,j)/RD ! [air mass concentration in kg air /m3A]
384
385	IF(flag_new_strat_compo) THEN
386	! SAD_sulfate: SAD WET sulfate aerosols (cm2/cm3)
387	SAD_sulfate(i,j) = SAD_sulfate(i,j) + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
388	& 4.RPI( mdw(it)f_r_wetB(i,j,it)/2. )**2. & ! [WET SA of part it in m2]
389	& *1.e-2 ! conversion from m2/m3 to cm2/cm3A
390	! samoment2 : 2nd order moment of WET sulfate aerosols (m2/m3)
391	samoment2 = samoment2 + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
392	& ( mdw(it)f_r_wetB(i,j,it)/2. )**2. ! [WET SA of part it in m2]
393	! samoment3 : 3nd order moment of WET sulfate aerosols (cm2/cm3)
394	samoment3 = samoment3 + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
395	& ( mdw(it)f_r_wetB(i,j,it)/2. )**3. ! [WET SA of part it in m2]
396	ELSE
397	! SAD_sulfate: SAD WET sulfate aerosols (cm2/cm3)
398	SAD_sulfate(i,j) = SAD_sulfate(i,j) + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
399	& 4.RPI( mdw(it)f_r_wet(i,j)/2. )**2. & ! [WET SA of part it in m2]
400	& *1.e-2 ! conversion from m2/m3 to cm2/cm3A
401	! samoment2 : 2nd order moment of WET sulfate aerosols (m2/m3)
402	samoment2 = samoment2 + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
403	& ( mdw(it)f_r_wet(i,j)/2. )**2. ! [WET SA of part it in m2]
404	! samoment3 : 3nd order moment of WET sulfate aerosols (cm2/cm3)
405	samoment3 = samoment3 + nd_mode(i,j,it) & ! [DRY part/m3A (in bin it)]
406	& ( mdw(it)f_r_wet(i,j)/2. )**3. ! [WET SA of part it in m2]
407	ENDIF
408	ENDDO
409	! reff_sulfate: effective radius of WET sulfate aerosols (cm)
410	IF(samoment2 > 1.e-30) THEN
411	reff_sulfate(i,j) = (samoment3 / samoment2) &
412	& *1.e2 ! conversion from m to cm
413
414	! Sanity check
415	IF(reff_sulfate(i,j) > 5.e-4) reff_sulfate(i,j) = 5.e-4 ! reff_sulfate max = 5 micron
416	IF(reff_sulfate(i,j) < 1.e-6) reff_sulfate(i,j) = 1.e-6 ! reff_sulfate min = 10 nm
417	ELSE
418	reff_sulfate(i,j) = 1.e-5 ! reff_sulfate N part = nul (ref = 100 nm)
419	ENDIF
420	ENDDO
421	ENDDO
422
423	END SUBROUTINE traccoag
424
425	END MODULE traccoag_mod

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