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traccoag_mod.F90 @ 4769

Last change on this file since 4769 was 2787, checked in by Laurent Fairhead, 8 years ago
Merged trunk changes r2727:2785 into testing branch
File size: 13.9 KB

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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	CONTAINS
7
8	SUBROUTINE traccoag(pdtphys, gmtime, debutphy, julien, &
9	presnivs, xlat, xlon, pphis, pphi, &
10	t_seri, pplay, paprs, sh, rh, tr_seri)
11
12	USE phys_local_var_mod, ONLY: mdw, R2SO4, DENSO4, f_r_wet, surf_PM25_sulf, &
13	& budg_emi_ocs, budg_emi_so2, budg_emi_h2so4, budg_emi_part
14
15	USE dimphy
16	USE infotrac
17	USE aerophys
18	USE geometry_mod, ONLY : cell_area
19	USE mod_grid_phy_lmdz
20	USE mod_phys_lmdz_mpi_data, ONLY : is_mpi_root
21	USE mod_phys_lmdz_para, only: gather, scatter
22	USE phys_cal_mod
23	USE sulfate_aer_mod
24	USE phys_local_var_mod, ONLY: stratomask
25	USE YOMCST
26
27	IMPLICIT NONE
28
29	! Input argument
30	!---------------
31	REAL,INTENT(IN) :: pdtphys ! Pas d'integration pour la physique (seconde)
32	REAL,INTENT(IN) :: gmtime ! Heure courante
33	LOGICAL,INTENT(IN) :: debutphy ! le flag de l'initialisation de la physique
34	INTEGER,INTENT(IN) :: julien ! Jour julien
35
36	REAL,DIMENSION(klev),INTENT(IN) :: presnivs! pressions approximat. des milieux couches (en PA)
37	REAL,DIMENSION(klon),INTENT(IN) :: xlat ! latitudes pour chaque point
38	REAL,DIMENSION(klon),INTENT(IN) :: xlon ! longitudes pour chaque point
39	REAL,DIMENSION(klon),INTENT(IN) :: pphis ! geopotentiel du sol
40	REAL,DIMENSION(klon,klev),INTENT(IN) :: pphi ! geopotentiel de chaque couche
41
42	REAL,DIMENSION(klon,klev),INTENT(IN) :: t_seri ! Temperature
43	REAL,DIMENSION(klon,klev),INTENT(IN) :: pplay ! pression pour le mileu de chaque couche (en Pa)
44	REAL,DIMENSION(klon,klev+1),INTENT(IN) :: paprs ! pression pour chaque inter-couche (en Pa)
45	REAL,DIMENSION(klon,klev),INTENT(IN) :: sh ! humidite specifique
46	REAL,DIMENSION(klon,klev),INTENT(IN) :: rh ! humidite relative
47
48	! Output argument
49	!----------------
50	REAL,DIMENSION(klon,klev,nbtr),INTENT(INOUT) :: tr_seri ! Concentration Traceur [U/KgA]
51
52	! Local variables
53	!----------------
54	! flag for sulfur emission scenario: (0) background aerosol ; (1) volcanic eruption ; (2) stratospheric aerosol injections (SAI)
55	INTEGER,PARAMETER :: flag_sulf_emit=2
56	!
57	!--flag_sulf_emit=1 --example Pinatubo
58	INTEGER,PARAMETER :: year_emit_vol=1991 ! year of emission date
59	INTEGER,PARAMETER :: mth_emit_vol=6 ! month of emission date
60	INTEGER,PARAMETER :: day_emit_vol=15 ! day of emission date
61	REAL,PARAMETER :: m_aer_emiss_vol=7.e9 ! emitted sulfur mass in kgS, e.g. 7Tg(S)=14Tg(SO2)
62	REAL,PARAMETER :: altemiss_vol=17.e3 ! emission altitude in m
63	REAL,PARAMETER :: sigma_alt_vol=1.e3 ! standard deviation of emission altitude in m
64	REAL,PARAMETER :: xlat_vol=15.14 ! latitude of volcano in degree
65	REAL,PARAMETER :: xlon_vol=120.35 ! longitude of volcano in degree
66
67	!--flag_sulf_emit=2 --SAI
68	REAL,PARAMETER :: m_aer_emiss_sai=1.e10 ! emitted sulfur mass in kgS, eg 1e9=1TgS, 1e10=10TgS
69	REAL,PARAMETER :: altemiss_sai=17.e3 ! emission altitude in m
70	REAL,PARAMETER :: sigma_alt_sai=1.e3 ! standard deviation of emission altitude in m
71	REAL,PARAMETER :: xlat_sai=0.01 ! latitude of SAI in degree
72	REAL,PARAMETER :: xlon_sai=120.35 ! longitude of SAI in degree
73
74	!--other local variables
75	INTEGER :: it, k, i, ilon, ilev, itime, i_int
76	LOGICAL,DIMENSION(klon,klev) :: is_strato ! true = above tropopause, false = below
77	REAL,DIMENSION(klon,klev) :: m_air_gridbox ! mass of air in every grid box [kg]
78	REAL,DIMENSION(klon_glo,klev,nbtr) :: tr_seri_glo ! Concentration Traceur [U/KgA]
79	REAL,DIMENSION(klev+1) :: altLMDz ! altitude of layer interfaces in m
80	REAL,DIMENSION(klev) :: f_lay_emiss ! fraction of emission for every vertical layer
81	REAL :: f_lay_sum ! sum of layer emission fractions
82	REAL :: alt ! altitude for integral calculation
83	INTEGER,PARAMETER :: n_int_alt=10 ! number of subintervals for integration over Gaussian emission profile
84	REAL,DIMENSION(nbtr_bin) :: r_bin ! particle radius in size bin [m]
85	REAL,DIMENSION(nbtr_bin) :: r_lower ! particle radius at lower bin boundary [m]
86	REAL,DIMENSION(nbtr_bin) :: r_upper ! particle radius at upper bin boundary [m]
87	REAL,DIMENSION(nbtr_bin) :: m_part_dry ! mass of one dry particle in size bin [kg]
88	REAL :: zrho ! Density of air [kg/m3]
89	REAL :: zdz ! thickness of atm. model layer in m
90	REAL,DIMENSION(klev) :: zdm ! mass of atm. model layer in kg
91	REAL,DIMENSION(klon,klev) :: dens_aer ! density of aerosol particles [kg/m3 aerosol] with default H2SO4 mass fraction
92	REAL :: dlat, dlon ! d latitude and d longitude of grid in degree
93	REAL :: emission ! emission
94
95	IF (is_mpi_root) THEN
96	PRINT *,'in traccoag: date from phys_cal_mod =',year_cur,'-',mth_cur,'-',day_cur,'-',hour
97	ENDIF
98
99	dlat=180./2./FLOAT(nbp_lat) ! d latitude in degree
100	dlon=360./2./FLOAT(nbp_lon) ! d longitude in degree
101
102	DO it=1, nbtr_bin
103	r_bin(it)=mdw(it)/2.
104	ENDDO
105
106	!--set boundaries of size bins
107	DO it=1, nbtr_bin
108	IF (it.EQ.1) THEN
109	r_upper(it)=sqrt(r_bin(it+1)*r_bin(it))
110	r_lower(it)=r_bin(it)**2./r_upper(it)
111	ELSEIF (it.EQ.nbtr_bin) THEN
112	r_lower(it)=sqrt(r_bin(it)*r_bin(it-1))
113	r_upper(it)=r_bin(it)**2./r_lower(it)
114	ELSE
115	r_lower(it)=sqrt(r_bin(it)*r_bin(it-1))
116	r_upper(it)=sqrt(r_bin(it+1)*r_bin(it))
117	ENDIF
118	ENDDO
119
120	IF (debutphy .and. is_mpi_root) THEN
121	DO it=1, nbtr_bin
122	PRINT *,'radius bin', it, ':', r_bin(it), '(from', r_lower(it), 'to', r_upper(it), ')'
123	ENDDO
124	ENDIF
125
126	!--initialising logical is_strato from stratomask
127	is_strato(:,:)=.FALSE.
128	WHERE (stratomask.GT.0.5) is_strato=.TRUE.
129
130	! STRACOMP (H2O, P, t_seri -> aerosol composition (R2SO4))
131	! H2SO4 mass fraction in aerosol (%)
132	CALL stracomp(sh,t_seri,pplay)
133
134	! aerosol density (gr/cm3)
135	CALL denh2sa(t_seri)
136
137	! compute factor for converting dry to wet radius (for every grid box)
138	f_r_wet(:,:) = (dens_aer_dry/(DENSO4(:,:)1000.)/(R2SO4(:,:)/100.))*(1./3.)
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	! IF (debutphy) THEN
148	! CALL gather(tr_seri, tr_seri_glo)
149	! IF (MAXVAL(tr_seri_glo).LT.1.e-30) THEN
150	!--initialising tracer concentrations to zero
151	! DO it=1, nbtr
152	! tr_seri(:,:,it)=0.0
153	! ENDDO
154	! ENDIF
155	! ENDIF
156
157	!--initialise emission diagnostics
158	budg_emi_ocs(:)=0.0
159	budg_emi_so2(:)=0.0
160	budg_emi_h2so4(:)=0.0
161	budg_emi_part(:)=0.0
162
163	!--sulfur emission, depending on chosen scenario (flag_sulf_emit)
164	SELECT CASE(flag_sulf_emit)
165
166	CASE(0) ! background aerosol
167	! do nothing (no emission)
168
169	CASE(1) ! volcanic eruption
170	!--only emit on day of eruption
171	! stretch emission over one day of Pinatubo eruption
172	IF (year_cur==year_emit_vol.AND.mth_cur==mth_emit_vol.AND.day_cur==day_emit_vol) THEN
173	!
174	DO i=1,klon
175	!Pinatubo eruption at 15.14N, 120.35E
176	IF ( xlat(i).GE.xlat_vol-dlat .AND. xlat(i).LT.xlat_vol+dlat .AND. &
177	xlon(i).GE.xlon_vol-dlon .AND. xlon(i).LT.xlon_vol+dlon ) THEN
178	!
179	PRINT *,'coordinates of volcanic injection point=',xlat(i), xlon(i), day_cur, mth_cur, year_cur
180	! compute altLMDz
181	altLMDz(:)=0.0
182	DO k=1, klev
183	zrho=pplay(i,k)/t_seri(i,k)/RD !air density in kg/m3
184	zdm(k)=(paprs(i,k)-paprs(i,k+1))/RG !mass of layer in kg
185	zdz=zdm(k)/zrho !thickness of layer in m
186	altLMDz(k+1)=altLMDz(k)+zdz !altitude of interface
187	ENDDO
188	!compute distribution of emission to vertical model layers (based on Gaussian peak in altitude)
189	f_lay_sum=0.0
190	DO k=1, klev
191	f_lay_emiss(k)=0.0
192	DO i_int=1, n_int_alt
193	alt=altLMDz(k)+float(i_int)*(altLMDz(k+1)-altLMDz(k))/float(n_int_alt)
194	f_lay_emiss(k)=f_lay_emiss(k)+1./(sqrt(2.RPI)sigma_alt_vol)* &
195	& exp(-0.5((alt-altemiss_vol)/sigma_alt_vol)2.) &
196	& (altLMDz(k+1)-altLMDz(k))/float(n_int_alt)
197	ENDDO
198	f_lay_sum=f_lay_sum+f_lay_emiss(k)
199	ENDDO
200	!correct for step integration error
201	f_lay_emiss(:)=f_lay_emiss(:)/f_lay_sum
202	!emission as SO2 gas (with m(SO2)=64/32*m_aer_emiss)
203	!vertically distributed emission
204	DO k=1, klev
205	! stretch emission over one day of Pinatubo eruption
206	emission=m_aer_emiss_vol(mSO2mol/mSatom)/m_air_gridbox(i,k)f_lay_emiss(k)/1./86400.
207	tr_seri(i,k,id_SO2_strat)=tr_seri(i,k,id_SO2_strat)+emission*pdtphys
208	budg_emi_so2(i)=budg_emi_so2(i)+emissionzdm(k)mSatom/mSO2mol
209	ENDDO
210	ENDIF ! emission grid cell
211	ENDDO ! klon loop
212	ENDIF ! emission period
213
214	CASE(2) ! stratospheric aerosol injections (SAI)
215	!
216	DO i=1,klon
217	! SAI standard scenario with continuous emission from 1 grid point at the equator
218	! SAI emission on single month
219	! IF ((mth_cur==4 .AND. &
220	! SAI continuous emission o
221	IF ( xlat(i).GE.xlat_sai-dlat .AND. xlat(i).LT.xlat_sai+dlat .AND. &
222	& xlon(i).GE.xlon_sai-dlon .AND. xlon(i).LT.xlon_sai+dlon ) THEN
223	!
224	PRINT *,'coordinates of SAI point=',xlat(i), xlon(i), day_cur, mth_cur, year_cur
225	! compute altLMDz
226	altLMDz(:)=0.0
227	DO k=1, klev
228	zrho=pplay(i,k)/t_seri(i,k)/RD !air density in kg/m3
229	zdm(k)=(paprs(i,k)-paprs(i,k+1))/RG !mass of layer in kg
230	zdz=zdm(k)/zrho !thickness of layer in m
231	altLMDz(k+1)=altLMDz(k)+zdz !altitude of interface
232	ENDDO
233	!compute distribution of emission to vertical model layers (based on Gaussian peak in altitude)
234	f_lay_sum=0.0
235	DO k=1, klev
236	f_lay_emiss(k)=0.0
237	DO i_int=1, n_int_alt
238	alt=altLMDz(k)+float(i_int)*(altLMDz(k+1)-altLMDz(k))/float(n_int_alt)
239	f_lay_emiss(k)=f_lay_emiss(k)+1./(sqrt(2.RPI)sigma_alt_sai)* &
240	& exp(-0.5((alt-altemiss_sai)/sigma_alt_sai)2.) &
241	& (altLMDz(k+1)-altLMDz(k))/float(n_int_alt)
242	ENDDO
243	f_lay_sum=f_lay_sum+f_lay_emiss(k)
244	ENDDO
245	!correct for step integration error
246	f_lay_emiss(:)=f_lay_emiss(:)/f_lay_sum
247	!emission as SO2 gas (with m(SO2)=64/32*m_aer_emiss)
248	!vertically distributed emission
249	DO k=1, klev
250	! stretch emission over whole year (360d)
251	emission=m_aer_emiss_sai(mSO2mol/mSatom)/m_air_gridbox(i,k)f_lay_emiss(k)/360./86400.
252	tr_seri(i,k,id_SO2_strat)=tr_seri(i,k,id_SO2_strat)+emission*pdtphys
253	budg_emi_so2(i)=budg_emi_so2(i)+emissionzdm(k)mSatom/mSO2mol
254	ENDDO
255	! !emission as monodisperse particles with 0.1um dry radius (BIN21)
256	! !vertically distributed emission
257	! DO k=1, klev
258	! ! stretch emission over whole year (360d)
259	! emission=m_aer_emiss(mH2SO4mol/mSatom)/m_part_dry(21)/m_air_gridbox(i,k)f_lay_emiss(k)/360./86400
260	! tr_seri(i,k,id_BIN01_strat+20)=tr_seri(i,k,id_BIN01_strat+20)+emission*pdtphys
261	! budg_emi_part(i)=budg_emi_part(i)+emissionzdm(k)mSatom/mH2SO4mol
262	! ENDDO
263	ENDIF ! emission grid cell
264	ENDDO ! klon loop
265
266	END SELECT ! emission scenario (flag_sulf_emit)
267
268	!--read background concentrations of OCS and SO2 and lifetimes from input file
269	!--update the variables defined in phys_local_var_mod
270	CALL interp_sulf_input(debutphy,pdtphys,paprs,tr_seri)
271
272	!--convert OCS to SO2 in the stratosphere
273	CALL ocs_to_so2(pdtphys,tr_seri,t_seri,pplay,paprs,is_strato)
274
275	!--convert SO2 to H2SO4
276	CALL so2_to_h2so4(pdtphys,tr_seri,t_seri,pplay,paprs,is_strato)
277
278	!--common routine for nucleation and condensation/evaporation with adaptive timestep
279	CALL micphy_tstep(pdtphys,tr_seri,t_seri,pplay,paprs,rh,is_strato)
280
281	!--call coagulation routine
282	CALL coagulate(pdtphys,mdw,tr_seri,t_seri,pplay,dens_aer,is_strato)
283
284	!--call sedimentation routine
285	CALL aer_sedimnt(pdtphys, t_seri, pplay, paprs, tr_seri, dens_aer)
286
287	!--compute mass concentration of PM2.5 sulfate particles (wet diameter and mass) at the surface for health studies
288	surf_PM25_sulf(:)=0.0
289	DO i=1,klon
290	DO it=1, nbtr_bin
291	IF (mdw(it) .LT. 2.5e-6) THEN
292	!surf_PM25_sulf(i)=surf_PM25_sulf(i)+tr_seri(i,1,it+nbtr_sulgas)*m_part(i,1,it) &
293	!assume that particles consist of ammonium sulfate at the surface (132g/mol) and are dry at T = 20 deg. C and 50 perc. humidity
294	surf_PM25_sulf(i)=surf_PM25_sulf(i)+tr_seri(i,1,it+nbtr_sulgas) &
295	& 132./98.dens_aer_dry4./3.RPI(mdw(it)/2.)*3 &
296	& pplay(i,1)/t_seri(i,1)/RD1.e9
297	ENDIF
298	ENDDO
299	ENDDO
300
301	! CALL minmaxsimple(tr_seri(:,:,id_SO2_strat),0.0,0.0,'fin SO2')
302	! DO it=1, nbtr_bin
303	! CALL minmaxsimple(tr_seri(:,:,nbtr_sulgas+it),0.0,0.0,'fin bin ')
304	! ENDDO
305
306	END SUBROUTINE traccoag
307
308	END MODULE traccoag_mod

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