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co2condens_mod.F @ 3807

Last change on this file since 3807 was 3739, checked in by emillour, 8 weeks ago
Mars PCM: Code tidying: put routines in modules, remove useless "return" statements, etc. EM
File size: 44.8 KB

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1	MODULE co2condens_mod
2
3	IMPLICIT NONE
4
5	logical, save :: scavco2cond = .false. ! flag for using scavenging_by_co2
6	!$OMP THREADPRIVATE(scavco2cond)
7	real, save :: CO2cond_ps = 1. ! Coefficient to control the surface pressure change
8
9	CONTAINS
10
11	SUBROUTINE co2condens(ngrid,nlayer,nq,nslope,ptimestep,
12	$ pcapcal,pplay,pplev,ptsrf,pt,
13	$ pphi,pdt,pdu,pdv,pdtsrf,pu,pv,pq,pdq,
14	$ piceco2,perennial_co2ice,
15	$ psolaralb,pemisurf,rdust,
16	$ pdtc,pdtsrfc,pdpsrf,pduc,pdvc,pdqc,
17	$ fluxsurf_sw,zls,
18	$ zdqssed_co2,pcondicea_co2microp,
19	$ pdqsc)
20
21	use tracer_mod, only: noms, igcm_h2o_ice, igcm_h2o_vap,
22	& igcm_dust_mass, igcm_dust_number,
23	& igcm_ccn_mass, igcm_ccn_number,
24	& igcm_hdo_ice, igcm_hdo_vap,
25	& nqperes,nqfils, ! MVals: variables isotopes
26	& qperemin,masseqmin,
27	& igcm_co2
28	use surfdat_h, only: emissiv
29	use geometry_mod, only: latitude, ! grid point latitudes (rad)
30	& longitude_deg, latitude_deg
31	use planete_h, only: obliquit
32	use comcstfi_h, only: cpp, g, r, pi
33	use dust_param_mod, only: freedust
34	use write_output_mod, only: write_output
35	#ifndef MESOSCALE
36	USE vertical_layers_mod, ONLY: ap, bp
37	#endif
38	use comslope_mod, ONLY: subslope_dist,def_slope_mean
39	USE paleoclimate_mod, ONLY: paleoclimate
40	use callkeys_mod, only: caps, co2clouds
41	use co2snow_mod, only: co2snow
42
43	IMPLICIT NONE
44	c=======================================================================
45	c subject:
46	c --------
47	c Condensation/sublimation of CO2 ice on the ground and in the
48	c atmosphere
49	c (Scheme described in Forget et al., Icarus, 1998)
50	c
51	c author: Francois Forget 1994-1996 ; updated 1996 -- 2018
52	c ------
53	c adapted to external CO2 ice clouds scheme by Deborah Bardet (2018) '
54	c
55	c=======================================================================
56	c
57	c 0. Declarations :
58	c ------------------
59	c
60
61	c-----------------------------------------------------------------------
62	c Arguments :
63	c ---------
64	INTEGER,INTENT(IN) :: ngrid ! number of atmospheric columns
65	INTEGER,INTENT(IN) :: nlayer ! number of vertical layers
66	INTEGER,INTENT(IN) :: nq ! number of tracers
67	INTEGER,INTENT(IN) :: nslope ! number of subslope
68
69	REAL,INTENT(IN) :: ptimestep ! physics timestep (s)
70	REAL,INTENT(IN) :: pcapcal(ngrid,nslope)
71	REAL,INTENT(IN) :: pplay(ngrid,nlayer) !mid-layer pressure (Pa)
72	REAL,INTENT(IN) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
73	REAL,INTENT(IN) :: ptsrf(ngrid,nslope) ! surface temperature (K)
74	REAL,INTENT(IN) :: pt(ngrid,nlayer) ! atmospheric temperature (K)
75	REAL,INTENT(IN) :: pphi(ngrid,nlayer) ! geopotential (m2.s-2)
76	REAL,INTENT(IN) :: pdt(ngrid,nlayer) ! tendency on temperature from
77	! previous physical processes (K/s)
78	REAL,INTENT(IN) :: pdu(ngrid,nlayer) ! tendency on zonal wind (m/s2)
79	! from previous physical processes
80	REAL,INTENT(IN) :: pdv(ngrid,nlayer) ! tendency on meridional wind (m/s2)
81	! from previous physical processes
82	REAL,INTENT(IN) :: pdtsrf(ngrid,nslope) ! tendency on surface temperature from
83	! previous physical processes (K/s)
84	REAL,INTENT(IN) :: pu(ngrid,nlayer) ! zonal wind (m/s)
85	REAL,INTENT(IN) :: pv(ngrid,nlayer) ! meridional wind (m/s)
86	REAL,INTENT(IN) :: pq(ngrid,nlayer,nq) ! tracers (../kg_air)
87	REAL,INTENT(IN) :: pdq(ngrid,nlayer,nq) ! tendency on tracers from
88	! previous physical processes
89
90	REAL,INTENT(IN) :: zdqssed_co2(ngrid) ! CO2 flux at the surface (kg.m-2.s-1)
91	REAL,INTENT(IN) :: pcondicea_co2microp(ngrid,nlayer)! tendency due to CO2 condensation (kg/kg.s-1)
92
93	REAL,INTENT(INOUT) :: piceco2(ngrid,nslope) ! CO2 ice on the surface (kg.m-2)
94	REAL,INTENT(INOUT) :: perennial_co2ice(ngrid,nslope) ! Perennial CO2 ice on the surface (kg.m-2)
95	REAL,INTENT(INOUT) :: psolaralb(ngrid,2,nslope) ! albedo of the surface
96	REAL,INTENT(INOUT) :: pemisurf(ngrid,nslope) ! emissivity of the surface
97	REAL,INTENT(IN) :: rdust(ngrid,nlayer) ! dust effective radius
98
99	! tendencies due to CO2 condensation/sublimation:
100	REAL,INTENT(OUT) :: pdtc(ngrid,nlayer) ! tendency on temperature (K/s)
101	REAL,INTENT(OUT) :: pdtsrfc(ngrid,nslope) ! tendency on surface temperature (K/s)
102	REAL,INTENT(OUT) :: pdpsrf(ngrid) ! tendency on surface pressure (Pa/s)
103	REAL,INTENT(OUT) :: pduc(ngrid,nlayer) ! tendency on zonal wind (m.s-2)
104	REAL,INTENT(OUT) :: pdvc(ngrid,nlayer) ! tendency on meridional wind (m.s-2)
105	REAL,INTENT(OUT) :: pdqc(ngrid,nlayer,nq) ! tendency on tracers
106	REAL,INTENT(OUT) :: pdqsc(ngrid,nq,nslope) ! tendency on surface tracers
107
108	! added to calculate flux dependent albedo:
109	REAL,intent(in) :: fluxsurf_sw(ngrid,2)
110	real,intent(in) :: zls ! solar longitude (rad)
111
112	c
113	c Local variables :
114	c -----------------
115
116	INTEGER i,j
117	INTEGER l,ig,iq,icap
118	REAL zt(ngrid,nlayer)
119	REAL zcpi
120	REAL ztcond (ngrid,nlayer+1) ! CO2 condensation temperature (atm)
121	REAL ztcondsol(ngrid) ! CO2 condensation temperature (surface)
122	REAL zdiceco2(ngrid,nslope)
123	REAL zdiceco2_mesh_avg(ngrid)
124	REAL zcondicea(ngrid,nlayer) ! condensation rate in layer l (kg/m2/s)
125	REAL zcondices(ngrid,nslope) ! condensation rate on the ground (kg/m2/s)
126	REAL zcondices_mesh_avg(ngrid) ! condensation rate on the ground (kg/m2/s)
127	REAL zfallice(ngrid,nlayer+1) ! amount of ice falling from layer l (kg/m2/s)
128	REAL condens_layer(ngrid,nlayer) ! co2clouds: condensation rate in layer l (kg/m2/s)
129	REAL condens_column(ngrid) ! co2clouds: sum(condens_layer(ig,:)) (kg/m2/s)
130	REAL zfallheat
131	REAL zmflux(nlayer+1)
132	REAL zu(nlayer),zv(nlayer)
133	REAL zqc(nlayer,nq),zq1(nlayer)
134	REAL ztsrf(ngrid,nslope)
135	REAL ztc(nlayer), ztm(nlayer+1)
136	REAL zum(nlayer+1) , zvm(nlayer+1)
137	REAL zqm(nlayer+1,nq),zqm1(nlayer+1)
138	REAL masse(nlayer),w(nlayer+1)
139	REAL Sm(nlayer),Smq(nlayer,nq),mixmas,qmix
140	REAL availco2
141	LOGICAL condsub(ngrid,nslope)
142
143	real :: emisref(ngrid,nslope)
144
145	REAL zdq_scav(ngrid,nlayer,nq) ! tendency due to scavenging by co2
146	REAL zq(ngrid,nlayer,nq)
147
148	c variable speciale diagnostique
149	real tconda1(ngrid,nlayer)
150	real tconda2(ngrid,nlayer)
151	c REAL zdiceco2a(ngrid) ! for diagnostic only
152	real zdtsig (ngrid,nlayer)
153	real zdt (ngrid,nlayer)
154	real vmr_co2(ngrid,nlayer) ! co2 volume mixing ratio
155	! improved_ztcond flag: If set to .true. (AND running with a 'co2' tracer)
156	! then condensation temperature is computed using partial pressure of CO2
157	logical,parameter :: improved_ztcond=.true.
158
159	c local saved variables
160	integer,save :: ico2 ! index of CO2 tracer
161	real,save :: qco2,mmean
162	real,parameter :: latcond=5.9e5 ! (J/kg) Latent heat of solid CO2 ice
163	real,parameter :: tcond1mb=136.27 ! condensation temperature (K) at 1 mbar
164	real,parameter :: cpice=1000. ! (J.kg-1.K-1) specific heat of CO2 ice
165	REAL,SAVE :: acond,bcond,ccond
166	real,save :: m_co2, m_noco2, A , B
167
168	LOGICAL,SAVE :: firstcall = .true. !,firstcall2=.true.
169
170	!$OMP THREADPRIVATE(ico2,qco2,mmean,acond,bcond,ccond,m_co2,m_noco2)
171	!$OMP THREADPRIVATE(A,B,firstcall)
172
173	c D.BARDET: for debug
174	real ztc3D(ngrid,nlayer)
175	REAL ztm3D(ngrid,nlayer)
176	REAL zmflux3D(ngrid,nlayer)
177
178	c MVals: variables isotopes
179	REAL Ratio1(nlayer),Ratiom1(nlayer+1)
180	REAL masseq(nlayer),wq(nlayer+1)
181	INTEGER ifils,iq2
182
183	c Subslope:
184
185	REAL :: emisref_tmp(ngrid) ! temporary emissiviy of a sub-grid surface before computing emissivity with snow [1]
186	REAL :: pemisurf_tmp(ngrid) ! temporary emissiviy of a sub-grid surface after computing emissivity with snow [1]
187	REAL :: alb_tmp(ngrid,2) ! temporary albedo before computing albedo with TES/fixed value [1]
188	REAL :: zcondices_tmp(ngrid) ! temporary condensation rate [kg/m^2/s]
189	REAL :: piceco2_tmp(ngrid) ! temporary amount of CO2 frost on the surface [kg/m^2]
190	REAL :: perennial_co2ice_tmp(ngrid) ! temporary amount of perennial CO2 frost on the surface [kg/m^2]
191	LOGICAL :: condsub_tmp(ngrid) ! Boolean to check if CO2 ice is condensing / sublimating on the sub grid surface [1]
192	REAL :: zfallice_tmp(ngrid,nlayer+1) ! temporary amount of ice falling from layer l for a specific sub-grid surface [kg/m^2/s]
193	REAL :: condens_layer_tmp(ngrid,nlayer) ! temporary condensation rate in layer l (co2 cloud) for a specific sub-grid surface [kg/m^2/s]
194	INTEGER :: islope ! index for loop variables
195	REAL :: pdqsc_tmp(ngrid,nq) ! tendency on surface tracers (grid-mesh average) after scavenging
196	c----------------------------------------------------------------------
197
198	c Initialisation
199	c --------------
200	c
201	! AS: firstcall OK absolute
202	IF (firstcall) THEN
203
204	bcond=1./tcond1mb
205	ccond=cpp/(g*latcond)
206	acond=r/latcond
207
208	firstcall=.false.
209	write(,) 'CO2condens: improved_ztcond=',improved_ztcond
210	PRINT*,'In co2condens:Tcond(P=1mb)=',tcond1mb,' Lcond=',latcond
211	PRINT*,'acond,bcond,ccond',acond,bcond,ccond
212
213	ico2=0
214
215	c Prepare Special treatment if one of the tracer is CO2 gas
216	do iq=1,nq
217	if (noms(iq).eq."co2") then
218	ico2=iq
219	m_co2 = 44.01E-3 ! CO2 molecular mass (kg/mol)
220	m_noco2 = 33.37E-3 ! Non condensible mol mass (kg/mol)
221	c Compute A and B coefficient use to compute
222	c mean molecular mass Mair defined by
223	c 1/Mair = q(ico2)/m_co2 + (1-q(ico2))/m_noco2
224	c 1/Mair = A*q(ico2) + B
225	A =(1/m_co2 - 1/m_noco2)
226	B=1/m_noco2
227	endif
228	enddo
229	ENDIF ! of IF (firstcall)
230	zcpi=1./cpp
231	if (paleoclimate) piceco2 = piceco2 + perennial_co2ice
232
233	c
234	c======================================================================
235	c Calcul of CO2 condensation sublimation
236	c ============================================================
237	c
238	c Used variable :
239	c piceco2(ngrid) : amount of co2 ice on the ground (kg/m2)
240	c zcondicea(ngrid,l): condensation rate in layer l (kg/m2/s)
241	c zcondices(ngrid): condensation rate on the ground (kg/m2/s)
242	c zfallice(ngrid,l):amount of ice falling from layer l (kg/m2/s)
243	c
244	c pdtc(ngrid,nlayer) : dT/dt due to cond/sub
245	c
246	c
247	c Tendencies set to 0
248	c -------------------------------------
249	zcondicea(1:ngrid,1:nlayer) = 0.
250	zfallice(1:ngrid,1:nlayer+1) = 0.
251	pduc(1:ngrid,1:nlayer) = 0
252	pdvc(1:ngrid,1:nlayer) = 0
253	pdtc(1:ngrid,1:nlayer) = 0.
254	pdqsc(1:ngrid,1:nq,1:nslope) = 0
255	pdqsc_tmp(1:ngrid,1:nq) = 0
256	pdqc(1:ngrid,1:nlayer,1:nq) = 0
257
258	zcondices(1:ngrid,1:nslope) = 0.
259	zcondices_mesh_avg(1:ngrid)=0.
260	pdtsrfc(1:ngrid,1:nslope) = 0.
261	pdpsrf(1:ngrid) = 0.
262	condsub(1:ngrid,1:nslope) = .false.
263	zdiceco2(1:ngrid,1:nslope) = 0.
264	zdiceco2_mesh_avg(1:ngrid)=0.
265
266	zfallheat=0
267
268	zdq_scav(:,:,:)=0.
269
270	c Update tendencies from previous processes
271	c -------------------------------------
272	DO l=1,nlayer
273	DO ig=1,ngrid
274	zt(ig,l)=pt(ig,l)+ pdt(ig,l)*ptimestep
275	do iq=1,nq
276	zq(ig,l,iq)=pq(ig,l,iq)+pdq(ig,l,iq)*ptimestep
277	enddo
278	ENDDO
279	ENDDO
280
281	c *************************
282	c ATMOSPHERIC CONDENSATION
283	c *************************
284
285	c Compute CO2 Volume mixing ratio
286	c -------------------------------
287	if (improved_ztcond.and.(ico2.ne.0)) then
288	DO l=1,nlayer
289	DO ig=1,ngrid
290	qco2=pq(ig,l,ico2)+pdq(ig,l,ico2)*ptimestep
291	c Mean air molecular mass = 1/(q(ico2)/m_co2 + (1-q(ico2))/m_noco2)
292	mmean=1/(A*qco2 +B)
293	vmr_co2(ig,l) = qco2*mmean/m_co2
294	ENDDO
295	ENDDO
296	else
297	DO l=1,nlayer
298	DO ig=1,ngrid
299	vmr_co2(ig,l)=0.95
300	ENDDO
301	ENDDO
302	endif
303
304	IF (.NOT. co2clouds) then
305	c forecast of atmospheric temperature zt and frost temperature ztcond
306	c --------------------------------------------------------------------
307
308	DO l=1,nlayer
309	DO ig=1,ngrid
310	! ztcond(ig,l)=1./(bcond-acondlog(.0095pplay(ig,l)))
311	if (pplay(ig,l).ge.1e-4) then
312	ztcond(ig,l)=
313	& 1./(bcond-acondlog(.01vmr_co2(ig,l)*pplay(ig,l)))
314	else
315	ztcond(ig,l)=0.0 !mars Monica
316	endif
317	ENDDO
318	ENDDO
319
320	ztcond(:,nlayer+1)=ztcond(:,nlayer)
321
322	c Condensation/sublimation in the atmosphere
323	c ------------------------------------------
324	c (calcul of zcondicea , zfallice and pdtc)
325	c
326	DO l=nlayer , 1, -1
327	DO ig=1,ngrid
328	pdtc(ig,l)=0.
329	IF((zt(ig,l).LT.ztcond(ig,l)).or.(zfallice(ig,l+1).gt.0))THEN
330	condsub(ig,:)=.true.
331	IF (zfallice(ig,l+1).gt.0) then
332	zfallheat=zfallice(ig,l+1)*
333	& (pphi(ig,l+1)-pphi(ig,l) +
334	& cpice*(ztcond(ig,l+1)-ztcond(ig,l)))/latcond
335	ELSE
336	zfallheat=0.
337	ENDIF
338	pdtc(ig,l)=(ztcond(ig,l) - zt(ig,l))/ptimestep
339	zcondicea(ig,l)=(pplev(ig,l)-pplev(ig,l+1))
340	& ccondpdtc(ig,l)- zfallheat
341	c Case when the ice from above sublimes entirely
342	c """""""""""""""""""""""""""""""""""""""""""""""
343	IF (zfallice(ig,l+1).lt.- zcondicea(ig,l)) then
344	pdtc(ig,l)=(-zfallice(ig,l+1)+zfallheat)/
345	& (ccond*(pplev(ig,l)-pplev(ig,l+1)))
346	zcondicea(ig,l)= -zfallice(ig,l+1)
347	END IF
348
349	zfallice(ig,l) = zcondicea(ig,l)+zfallice(ig,l+1)
350	END IF
351	ENDDO
352	ENDDO
353
354	condens_layer(:,:) = zcondicea(:,:)
355	condens_column(:) = 0.
356
357	if (scavco2cond) then
358	call scavenging_by_co2(ngrid,nlayer,nq,ptimestep,pplev,zq,
359	& rdust,zcondicea,zfallice,zdq_scav,
360	& pdqsc_tmp)
361
362	DO islope = 1,nslope
363	pdqsc(:,:,islope)= pdqsc_tmp(:,:)*
364	& cos(pi*def_slope_mean(islope)/180.)
365	ENDDO
366	endif
367	call write_output("co2condens_zfallice",
368	& "CO2 ice tendency on the surface",
369	& "kg.m-2.s-1",zfallice(:,1))
370	ELSE ! if co2 clouds
371	condens_layer(:,:) = 0.
372	condens_column(:) = 0.
373	DO l=nlayer , 1, -1
374	DO ig=1,ngrid
375	condens_layer(ig,l) = pcondicea_co2microp(ig,l)*
376	& (pplev(ig,l) - pplev(ig,l+1))/g
377	ENDDO
378	ENDDO
379	DO ig=1,ngrid
380	condens_column(ig) = sum(condens_layer(ig,:))
381	zfallice(ig,1) = zdqssed_co2(ig)
382	DO islope = 1,nslope
383	piceco2(ig,islope) = piceco2(ig,islope) +
384	& zdqssed_co2(ig)ptimestep
385	& cos(pi*def_slope_mean(islope)/180.)
386	ENDDO
387	ENDDO
388	call write_output("co2condens_zfallice",
389	& "CO2 ice tendency on the surface",
390	& "kg.m-2.s-1",zdqssed_co2(:)) ! otherwise we have not 1 day(1proc) = 1 day (24procs) test
391	ENDIF ! end of if co2clouds
392
393	call write_output("co2condens_pdtc",
394	& "Temperature tendency due to CO2 condensation",
395	& "K.s-1",pdtc(:,:))
396
397	! call write_output("condens_layer",
398	! & "",
399	! & " ",condens_layer(:,:))
400
401	c *************************
402	c SURFACE CONDENSATION
403	c *************************
404
405	c forecast of ground temperature ztsrf and frost temperature ztcondsol
406	c --------------------------------------------------------------------
407	DO ig=1,ngrid
408	ztcondsol(ig)=
409	& 1./(bcond-acondlog(.01vmr_co2(ig,1)*pplev(ig,1)))
410	DO islope = 1,nslope
411	ztsrf(ig,islope) = ptsrf(ig,islope) +
412	& pdtsrf(ig,islope)*ptimestep
413	ENDDO
414	ENDDO
415
416	c
417	c Condensation/sublimation on the ground
418	c --------------------------------------
419	c (compute zcondices and pdtsrfc)
420	c
421	c No microphysics of CO2 clouds
422	DO ig=1,ngrid
423	IF(latitude(ig).lt.0) THEN
424	! Southern hemisphere
425	icap=2
426	ELSE
427	! Northern hemisphere
428	icap=1
429	ENDIF
430
431	DO islope = 1,nslope
432	c Need first to put piceco2_slope(ig,islope) in kg/m^2 flat
433
434	piceco2(ig,islope) = piceco2(ig,islope)
435	& /cos(pi*def_slope_mean(islope)/180.)
436
437	c
438	c Loop on where we have condensation/ sublimation
439	IF ((ztsrf(ig,islope) .LT. ztcondsol(ig)) .OR. ! ground cond
440	$ (zfallice(ig,1).NE.0.) .OR. ! falling snow
441	$ ((ztsrf(ig,islope) .GT. ztcondsol(ig)) .AND. ! ground sublim.
442	$ ((piceco2(ig,islope)+zfallice(ig,1)*ptimestep)
443	$ .NE. 0.))) THEN
444	condsub(ig,islope) = .true.
445
446	IF (zfallice(ig,1).gt.0 .and. .not. co2clouds) then
447	! potential eneregy release due to the impact of the snowfall
448	! appendix of forget et al. 1999
449	zfallheat = zfallice(ig,1) * (pphi(ig,1) +
450	& cpice*(ztcond(ig,1)-ztcondsol(ig)))/latcond
451	ELSE
452	zfallheat = 0.
453	ENDIF
454	c condensation or partial sublimation of CO2 ice
455	c """""""""""""""""""""""""""""""""""""""""""""""
456	if(ztsrf(ig,islope).LT. ztcondsol(ig)) then
457	c condensation
458	zcondices(ig,islope)=pcapcal(ig,islope)
459	& *(ztcondsol(ig)-ztsrf(ig,islope))
460	& /((latcond+cpp(zt(ig,1)-ztcondsol(ig)))ptimestep)
461	& - zfallheat
462	else
463	c sublimation
464	zcondices(ig,islope)=pcapcal(ig,islope)
465	& *(ztcondsol(ig)-ztsrf(ig,islope))
466	& /(latcond*ptimestep)
467	& - zfallheat
468	endif
469	pdtsrfc(ig,islope) = (ztcondsol(ig) - ztsrf(ig,islope))
470	& /ptimestep
471	#ifdef MESOSCALE
472	print*, "not enough CO2 tracer in 1st layer to condense"
473	print*, ">>> to be implemented in the mesoscale case"
474	print*, "because this uses ap levels..."
475	#else
476	c If there is not enough CO2 tracer in 1st layer to condense
477	c """"""""""""""""""""""""""""""""""""""""""""""""""""""
478	IF(ico2.ne.0) then
479	c Available CO2 tracer in layer 1 at end of timestep (kg/m2)
480	#ifndef MESOSCALE
481	availco2 = pq(ig,1,ico2)*((ap(1)-ap(2))+
482	& (bp(1)-bp(2))*(pplev(ig,1)/g -
483	& (zcondices(ig,islope) + zfallice(ig,1))
484	& *ptimestep))
485	if ((zcondices(ig,islope) + condens_layer(ig,1))
486	& *ptimestep
487	& .gt.availco2) then
488	zcondices(ig,islope) = availco2/ptimestep -
489	& condens_layer(ig,1)
490	pdtsrfc(ig,islope) = (latcond/pcapcal(ig,islope))*
491	& (zcondices(ig,islope)+zfallheat)
492	end if
493	#else
494	availco2 = pq(ig,1,igcm_co2)
495	PRINT*, "MESOSCALE: CO2 tracer AT FIRST LEVEL IS NOT'
496	& ' CORRECTED FROM SIGMA LEVELS"
497	#endif
498	ENDIF
499	#endif
500
501	c If the entire CO2 ice layer sublimes on the slope
502	c """"""""""""""""""""""""""""""""""""""""""""""""""""
503	c (including what has just condensed in the atmosphere)
504	if (co2clouds) then
505	IF((piceco2(ig,islope)/ptimestep).LE.
506	& -zcondices(ig,islope))THEN
507	zcondices(ig,islope) = -piceco2(ig,islope)/ptimestep
508	pdtsrfc(ig,islope)=(latcond/pcapcal(ig,islope)) *
509	& (zcondices(ig,islope)+zfallheat)
510	END IF
511	else
512	IF((piceco2(ig,islope)/ptimestep+zfallice(ig,1)).LE.
513	& -zcondices(ig,islope))THEN
514	zcondices(ig,islope) = -piceco2(ig,islope)
515	& /ptimestep - zfallice(ig,1)
516	pdtsrfc(ig,islope)=(latcond/pcapcal(ig,islope)) *
517	& (zcondices(ig,islope)+zfallheat)
518	END IF
519	end if
520
521	c Changing CO2 ice amount and pressure per slope:
522	c """"""""""""""""""""""""""""""""""""
523	zdiceco2(ig,islope) = zcondices(ig,islope)+zfallice(ig,1)
524	& + condens_column(ig)
525	if (co2clouds) then
526	! add here only direct condensation/sublimation
527	piceco2(ig,islope) = piceco2(ig,islope) +
528	& zcondices(ig,islope)*ptimestep
529	else
530	! add here also CO2 ice in the atmosphere
531	piceco2(ig,islope) = piceco2(ig,islope) +
532	& zdiceco2(ig,islope)*ptimestep
533	end if
534
535	zcondices_mesh_avg(ig) = zcondices_mesh_avg(ig) +
536	& zcondices(ig,islope)* subslope_dist(ig,islope)
537
538	zdiceco2_mesh_avg(ig) = zdiceco2_mesh_avg(ig) +
539	& zdiceco2(ig,islope)* subslope_dist(ig,islope)
540
541	END IF ! if there is condensation/sublimation
542
543	piceco2(ig,islope) = piceco2(ig,islope)
544	& * cos(pi*def_slope_mean(islope)/180.)
545
546	ENDDO !islope
547
548	pdpsrf(ig) = -zdiceco2_mesh_avg(ig)*g
549
550	IF(ABS(pdpsrf(ig)*ptimestep).GT.pplev(ig,1)) THEN
551	PRINT*,'STOP in condens'
552	PRINT*,'condensing more than total mass'
553	PRINT*,'Grid point ',ig
554	PRINT*,'Longitude(degrees): ',longitude_deg(ig)
555	PRINT*,'Latitude(degrees): ',latitude_deg(ig)
556	PRINT*,'Ps = ',pplev(ig,1)
557	PRINT*,'d Ps = ',pdpsrf(ig)
558	CALL abort_physic('co2condens',
559	& 'condensing more than total mass', 1)
560	ENDIF
561
562	ENDDO ! of DO ig=1,ngrid
563
564
565	c ********************************************************************
566	c Surface albedo and emissivity of the surface below the snow (emisref)
567	c ********************************************************************
568
569	! Redistribute piceco2 into piceco2 (frost) and perennial_co2ice
570	! --------------------------------------------------------------
571	if (paleoclimate) then
572	where (piceco2 > perennial_co2ice) ! Perennial co2 ice has not been affected
573	! It means:
574	! - In case of sublimation, only frost is lost
575	! - In case of condensation, only frost accumulates new ice
576	piceco2 = piceco2 - perennial_co2ice
577	else where ! Perennial co2 ice has been affected
578	! It means that frost disappeared with sublimation and perennial ice is being lost
579	perennial_co2ice = piceco2
580	piceco2 = 0.
581	end where
582	endif
583
584	! Check that amont of CO2 ice is not problematic
585	! ----------------------------------------------
586	DO ig = 1,ngrid
587	DO islope = 1,nslope
588	if (piceco2(ig,islope) < 0.) then
589	if (piceco2(ig,islope) <= -5.e-8) print*,
590	$ 'WARNING co2condens piceco2(',ig,',',islope,
591	$ ') =',piceco2(ig,islope)
592	piceco2(ig,islope) = 0.
593	endif
594	ENDDO
595	ENDDO
596	if (paleoclimate) then
597	DO ig = 1,ngrid
598	DO islope = 1,nslope
599	if (perennial_co2ice(ig,islope) < 0.) then
600	if (perennial_co2ice(ig,islope) <= -5.e-8) print*,
601	$ 'WARNING co2condens perennial_co2ice(',ig,',',islope,
602	$ ') =',perennial_co2ice(ig,islope)
603	perennial_co2ice(ig,islope) = 0.
604	endif
605	ENDDO
606	ENDDO
607	endif
608
609	! Set albedo and emissivity of the surface
610	! ----------------------------------------
611	DO islope = 1,nslope
612	piceco2_tmp = piceco2(:,islope)
613	alb_tmp = psolaralb(:,:,islope)
614	emisref_tmp = 0.
615	perennial_co2ice_tmp = perennial_co2ice(:,islope)
616	CALL albedocaps(zls,ngrid,piceco2_tmp,perennial_co2ice_tmp,
617	& alb_tmp,emisref_tmp)
618	perennial_co2ice(:,islope) = perennial_co2ice_tmp
619	psolaralb(:,:,islope) = alb_tmp(:,:)
620	emisref(:,islope) = emisref_tmp
621	ENDDO
622
623	! Set pemisurf() to emissiv when there is bare surface (needed for co2snow)
624	! -------------------------------------------------------------------------
625	where (piceco2 == 0.) pemisurf = emissiv
626
627
628	! firstcall2=.false.
629	c ***************************************************************
630	c Correction to account for redistribution between sigma or hybrid
631	c layers when changing surface pressure (and warming/cooling
632	c of the CO2 currently changing phase).
633	c *************************************************************
634
635	DO ig=1,ngrid
636	if (any(condsub(ig,:))) then
637	do l=1,nlayer
638	ztc(l) =zt(ig,l) +pdtc(ig,l) *ptimestep
639	zu(l) =pu(ig,l) +pdu( ig,l) *ptimestep
640	zv(l) =pv(ig,l) +pdv( ig,l) *ptimestep
641	do iq=1,nq
642	zqc(l,iq)=zq(ig,l,iq)+zdq_scav(ig,l,iq)*ptimestep ! zdq_scav=0 if co2clouds=true
643	enddo
644	enddo
645
646	c Mass fluxes through the sigma levels (kg.m-2.s-1) (>0 when up)
647	c """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
648	zmflux(1) = -zcondices_mesh_avg(ig) - zdqssed_co2(ig)
649	DO l=1,nlayer
650	zmflux(l+1) = zmflux(l) - condens_layer(ig,l)
651	#ifndef MESOSCALE
652	& + (bp(l)-bp(l+1))*(-pdpsrf(ig)/g)
653	c zmflux set to 0 if very low to avoid: top layer is disappearing in v1ld
654	if (abs(zmflux(l+1)).lt.1E-13.OR.bp(l+1).eq.0.) then
655	zmflux(l+1)=0.
656	end if
657	#else
658	zmflux(l+1) = zmflux(l) - condens_layer(ig,l)
659	if (abs(zmflux(l+1)).lt.1E-13) zmflux(l+1)=0.
660	PRINT*, "MESOSCALE: FLUX THROUGH SIGMA LEVELS from"//
661	& "dPS HAVE TO BE IMPLEMENTED"
662	#endif
663	END DO
664	#ifdef MESOSCALE
665	print*,"absurd mass set because bp not available"
666	print*,"TO BE FIXED"
667	#else
668	c Mass of each layer at the end of timestep
669	c -----------------------------------------
670	DO l=1,nlayer
671	masse(l)=( pplev(ig,l) - pplev(ig,l+1) +
672	& (bp(l)-bp(l+1))pdpsrf(ig)ptimestep)/g
673	END DO
674	#endif
675
676	c Corresponding fluxes for T,U,V,Q
677	c """"""""""""""""""""""""""""""""
678
679	c averaging operator for TRANSPORT
680	c """"""""""""""""""""""""""""""""
681	c Value transfert at the surface interface when condensation
682	c sublimation:
683	if (zmflux(1).lt.0) then
684	c Surface condensation
685	ztm(1) = ztc(1)
686	else
687	c Surface sublimation:
688	ztm(1) = ztcondsol(ig)
689	endif
690	zum(1) = 0
691	zvm(1) = 0
692	do iq=1,nq
693	zqm(1,iq)=0. ! most tracer do not condense !
694	enddo
695	c Special case if one of the tracer is CO2 gas
696	if (ico2.ne.0) zqm(1,ico2)=1. ! flux is 100% CO2
697
698	c Van Leer scheme:
699	DO l=1,nlayer+1
700	w(l)=-zmflux(l)*ptimestep
701	END DO
702	call vl1d(nlayer,ztc,2.,masse,w,ztm)
703	call vl1d(nlayer,zu ,2.,masse,w,zum)
704	call vl1d(nlayer,zv ,2.,masse,w,zvm)
705	! MVals: loop over the fathers ("peres")
706	do iq=1,nqperes
707	do l=1,nlayer
708	zq1(l)=zqc(l,iq)
709	enddo
710	zqm1(1)=zqm(1,iq)
711	call vl1d(nlayer,zq1,2.,masse,w,zqm1)
712	do l=2,nlayer
713	zqc(l,iq)=zq1(l)
714	zqm(l,iq)=zqm1(l)
715	enddo
716	! MVals: loop over the sons ("fils")
717	if (nqfils(iq).gt.0) then
718	if (iq.eq.igcm_h2o_ice) then
719	iq2=igcm_hdo_ice
720	else if (iq.eq.igcm_h2o_vap) then
721	iq2=igcm_hdo_vap
722	else
723	call abort_physic("co2condens_mod","invalid isotope",1)
724	endif
725	do l=1,nlayer
726	if (zqc(l,iq).gt.qperemin) then
727	Ratio1(l)=zqc(l,iq2)/zqc(l,iq)
728	else
729	Ratio1(l)=0.
730	endif
731	masseq(l)=max(masse(l)*zqc(l,iq),masseqmin)
732	wq(l)=w(l)*zqm(l,iq)
733	enddo
734	Ratiom1(1)=zqm(1,iq2)
735	call vl1d(nlayer,Ratio1,2.,masseq,wq,Ratiom1)
736	zqm(1,iq2)=Ratiom1(1)*zqc(1,iq)
737	do l=2,nlayer
738	zqm(l,iq2)=Ratiom1(l)*zqm(l,iq)
739	enddo
740	endif !if (nqfils(iq).gt.0) then
741	enddo !iq=1,nqperes
742
743	c Surface condensation affects low winds
744	if (zmflux(1).lt.0) then
745	zum(1)= zu(1) * (w(1)/masse(1))
746	zvm(1)= zv(1) * (w(1)/masse(1))
747	if (w(1).gt.masse(1)) then ! ensure numerical stability
748	zum(1)= (zu(1)-zum(2))*masse(1)/w(1) + zum(2)
749	zvm(1)= (zv(1)-zvm(2))*masse(1)/w(1) + zvm(2)
750	end if
751	end if
752
753	ztm(nlayer+1)= ztc(nlayer) ! should not be used, but...
754	zum(nlayer+1)= zu(nlayer) ! should not be used, but...
755	zvm(nlayer+1)= zv(nlayer) ! should not be used, but...
756	do iq=1,nq
757	zqm(nlayer+1,iq)= zqc(nlayer,iq)
758	enddo
759
760	#ifdef MESOSCALE
761	!!!! AS: This part must be commented in the mesoscale model
762	!!!! AS: ... to avoid instabilities.
763	!!!! AS: you have to compile with -DMESOSCALE to do so
764	#else
765	c Tendencies on T, U, V, Q
766	c """"""""""""""""""""""""
767	DO l=1,nlayer
768	IF(.not. co2clouds) THEN
769	c Tendencies on T
770	zdtsig(ig,l) = (1/masse(l)) *
771	& ( zmflux(l)*(ztm(l) - ztc(l))
772	& - zmflux(l+1)*(ztm(l+1) - ztc(l))
773	& + condens_layer(ig,l)*(ztcond(ig,l)-ztc(l)) )
774	ELSE
775	zdtsig(ig,l) = (1/masse(l)) *
776	& ( zmflux(l)*(ztm(l) - ztc(l))
777	& - zmflux(l+1)*(ztm(l+1) - ztc(l)))
778	ENDIF
779	c D.BARDET: for diagnotics
780	zmflux3D(ig,l)=zmflux(l)
781	ztm3D(ig,l)=ztm(l)
782	ztc3D(ig,l)=ztc(l)
783
784	pdtc(ig,l) = pdtc(ig,l) + zdtsig(ig,l)
785
786	c Tendencies on U
787	pduc(ig,l) = (1/masse(l)) *
788	& ( zmflux(l)*(zum(l) - zu(l))
789	& - zmflux(l+1)*(zum(l+1) - zu(l)) )
790
791
792	c Tendencies on V
793	pdvc(ig,l) = (1/masse(l)) *
794	& ( zmflux(l)*(zvm(l) - zv(l))
795	& - zmflux(l+1)*(zvm(l+1) - zv(l)) )
796
797	END DO
798
799	#endif
800
801	do iq=1,nq
802	! if (noms(iq).eq.'co2') then
803	if (iq.eq.ico2) then
804	c SPECIAL Case when the tracer IS CO2 :
805	DO l=1,nlayer
806	pdqc(ig,l,iq)= (1/masse(l)) *
807	& ( zmflux(l)*(zqm(l,iq) - zqc(l,iq))
808	& - zmflux(l+1)*(zqm(l+1,iq) - zqc(l,iq))
809	& + condens_layer(ig,l)*(zqc(l,iq)-1.) )
810	END DO
811	else
812	DO l=1,nlayer
813	pdqc(ig,l,iq)= (1/masse(l)) *
814	& ( zmflux(l)*(zqm(l,iq) - zqc(l,iq))
815	& - zmflux(l+1)*(zqm(l+1,iq) - zqc(l,iq))
816	& + condens_layer(ig,l)*zqc(l,iq) )
817
818	pdqc(ig,l,iq)=pdqc(ig,l,iq)+zdq_scav(ig,l,iq) ! zdq_scav=0 if co2clouds=true
819	END DO
820	end if
821	enddo
822
823	end if ! if (condsub)
824	END DO ! loop on ig
825
826	c ***************************************************************
827	c CO2 snow / clouds scheme
828	c ***************************************************************
829	DO islope = 1,nslope
830	emisref_tmp(:) = emisref(:,islope)
831	condsub_tmp(:) = condsub(:,islope)
832	condens_layer_tmp(:,:) = condens_layer(:,:)*
833	& cos(pi*def_slope_mean(islope)/180.)
834	zcondices_tmp(:) = zcondices(:,islope)*
835	& cos(pi*def_slope_mean(islope)/180.)
836	zfallice_tmp(:,:) = zfallice(:,:)*
837	& cos(pi*def_slope_mean(islope)/180.)
838	pemisurf_tmp(:) = pemisurf(:,islope)
839
840	call co2snow(ngrid,nlayer,ptimestep,emisref_tmp,condsub_tmp,
841	& pplev,condens_layer_tmp,zcondices_tmp,zfallice_tmp,
842	& pemisurf_tmp)
843	pemisurf(:,islope) = pemisurf_tmp(:)
844
845	ENDDO
846	c ***************************************************************
847	c Ecriture des diagnostiques
848	c ***************************************************************
849
850	c DO l=1,nlayer
851	c DO ig=1,ngrid
852	c Taux de cond en kg.m-2.pa-1.s-1
853	c tconda1(ig,l)=zcondicea(ig,l)/(pplev(ig,l)-pplev(ig,l+1))
854	c Taux de cond en kg.m-3.s-1
855	c tconda2(ig,l)=tconda1(ig,l)pplay(ig,l)g/(r*pt(ig,l))
856	c END DO
857	c END DO
858	c call write_output('tconda1',
859	c &'Taux de condensation CO2 atmospherique /Pa',
860	c & 'kg.m-2.Pa-1.s-1',tconda1)
861	c call write_output('tconda2',
862	c &'Taux de condensation CO2 atmospherique /m',
863	c & 'kg.m-3.s-1',tconda2)
864
865	! output falling co2 ice in 1st layer:
866	! call write_output('fallice',
867	! &'Precipitation of co2 ice',
868	! & 'kg.m-2.s-1',zfallice(1,1))
869
870	#ifndef MESOSCALE
871	! Extra special case for surface temperature tendency pdtsrfc:
872	! we want to fix the south pole temperature to CO2 condensation temperature
873	if (caps.and.(obliquit.lt.27.).and.(.not.(paleoclimate))) then
874	! check if last grid point is the south pole
875	if (abs(latitude(ngrid)-(-pi/2.)).lt.1.e-5) then
876	! NB: Updated surface pressure, at grid point 'ngrid', is
877	! ps(ngrid)=pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep
878	ztcondsol(ngrid)=
879	& 1./(bcond-acondlog(.01vmr_co2(ngrid,1)*
880	& (pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep)))
881	DO islope = 1,nslope
882	pdtsrfc(ngrid,islope)=(ztcondsol(ngrid)-
883	& ztsrf(ngrid,islope))/ptimestep
884	ENDDO ! islope = 1,nslope
885	endif
886	endif
887	#endif
888
889	END SUBROUTINE co2condens
890
891
892
893	c *****************************************************************
894	SUBROUTINE vl1d(nlayer,q,pente_max,masse,w,qm)
895	c
896	c
897	c Operateur de moyenne inter-couche pour calcul de transport type
898	c Van-Leer " pseudo amont " dans la verticale
899	c q,w sont des arguments d'entree pour le s-pg ....
900	c masse : masse de la couche Dp/g
901	c w : masse d'atm ``transferee'' a chaque pas de temps (kg.m-2)
902	c pente_max = 2 conseillee
903	c
904	c
905	c --------------------------------------------------------------------
906	IMPLICIT NONE
907
908	c
909	c
910	c
911	c Arguments:
912	c ----------
913	integer nlayer
914	real masse(nlayer),pente_max
915	REAL q(nlayer),qm(nlayer+1)
916	REAL w(nlayer+1)
917	c
918	c Local
919	c ---------
920	c
921	INTEGER l
922	c
923	real dzq(nlayer),dzqw(nlayer),adzqw(nlayer),dzqmax
924	real sigw, Mtot, MQtot
925	integer m
926	c integer ismax,ismin
927
928
929	c On oriente tout dans le sens de la pression
930	c W > 0 WHEN DOWN !!!!!!!!!!!!!
931
932	do l=2,nlayer
933	dzqw(l)=q(l-1)-q(l)
934	adzqw(l)=abs(dzqw(l))
935	enddo
936
937	do l=2,nlayer-1
938	if(dzqw(l)*dzqw(l+1).gt.0.) then
939	dzq(l)=0.5*(dzqw(l)+dzqw(l+1))
940	else
941	dzq(l)=0.
942	endif
943	dzqmax=pente_max*min(adzqw(l),adzqw(l+1))
944	dzq(l)=sign(min(abs(dzq(l)),dzqmax),dzq(l))
945	enddo
946
947	dzq(1)=0.
948	dzq(nlayer)=0.
949
950	do l = 1,nlayer-1
951
952	c Regular scheme (transfered mass < layer mass)
953	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
954	if(w(l+1).gt.0. .and. w(l+1).le.masse(l+1)) then
955	sigw=w(l+1)/masse(l+1)
956	qm(l+1)=(q(l+1)+0.5(1.-sigw)dzq(l+1))
957	else if(w(l+1).le.0. .and. -w(l+1).le.masse(l)) then
958	sigw=w(l+1)/masse(l)
959	qm(l+1)=(q(l)-0.5(1.+sigw)dzq(l))
960
961	c Extended scheme (transfered mass > layer mass)
962	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
963	else if(w(l+1).gt.0.) then
964	m=l+1
965	Mtot = masse(m)
966	MQtot = masse(m)*q(m)
967	do while ((m.lt.nlayer).and.(w(l+1).gt.(Mtot+masse(m+1))))
968	m=m+1
969	Mtot = Mtot + masse(m)
970	MQtot = MQtot + masse(m)*q(m)
971	end do
972	if (m.lt.nlayer) then
973	sigw=(w(l+1)-Mtot)/masse(m+1)
974	qm(l+1)= (1/w(l+1))(MQtot + (w(l+1)-Mtot)
975	& (q(m+1)+0.5(1.-sigw)dzq(m+1)) )
976	else
977	w(l+1) = Mtot
978	qm(l+1) = Mqtot / Mtot
979	CALL abort_physic('co2condens',
980	& 'top layer is disapearing !', 1)
981	end if
982	else ! if(w(l+1).lt.0)
983	m = l-1
984	Mtot = masse(m+1)
985	MQtot = masse(m+1)*q(m+1)
986	if (m.gt.0) then ! because some compilers will have problems
987	! evaluating masse(0)
988	do while ((m.gt.0).and.(-w(l+1).gt.(Mtot+masse(m))))
989	m=m-1
990	Mtot = Mtot + masse(m+1)
991	MQtot = MQtot + masse(m+1)*q(m+1)
992	if (m.eq.0) exit
993	end do
994	endif
995	if (m.gt.0) then
996	sigw=(w(l+1)+Mtot)/masse(m)
997	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)
998	& (q(m)-0.5(1.+sigw)dzq(m)) )
999	else
1000	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)qm(1))
1001	end if
1002	end if
1003	enddo
1004
1005	c boundary conditions (not used in co2condens !!)
1006	c qm(nlayer+1)=0.
1007	c if(w(1).gt.0.) then
1008	c qm(1)=q(1)
1009	c else
1010	c qm(1)=0.
1011	c end if
1012
1013	END SUBROUTINE vl1d
1014
1015	c *****************************************************************
1016	SUBROUTINE scavenging_by_co2(ngrid,nlayer,nq,ptimestep,pplev,pq,
1017	& rdust,pcondicea,pfallice,pdq_scav,pdqsc)
1018
1019	c
1020	c
1021	c Calcul de la quantite de poussiere lessivee par les nuages de CO2
1022	c
1023	c --------------------------------------------------------------------
1024	use tracer_mod, only: nqmx, igcm_h2o_vap, igcm_h2o_ice,
1025	& igcm_dust_mass, igcm_dust_number,
1026	& igcm_ccn_mass, igcm_ccn_number,
1027	& rho_dust, nuice_sed, nuice_ref,r3n_q
1028	use comcstfi_h, only: g
1029	use dust_param_mod, only: freedust
1030	use callkeys_mod, only: water, microphys
1031	IMPLICIT NONE
1032	c
1033	c
1034	c Arguments:
1035	INTEGER,INTENT(IN) :: ngrid ! number of atmospheric columns
1036	INTEGER,INTENT(IN) :: nlayer ! number of vertical layers
1037	INTEGER,INTENT(IN) :: nq ! number of tracers
1038	REAL,INTENT(IN) :: ptimestep ! physics timestep (s)
1039	REAL,INTENT(IN) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
1040	REAL,INTENT(IN) :: pq(ngrid,nlayer,nq)
1041	REAL,INTENT(IN) :: rdust(ngrid,nlayer) ! dust effective radius
1042	REAL,INTENT(IN) :: pcondicea(ngrid,nlayer) ! condensation rate in layer l (kg/m2/s)
1043	REAL,INTENT(IN) :: pfallice(ngrid,nlayer+1) ! amount of ice falling from layer l (kg/m2/s)
1044
1045	REAL,INTENT(OUT) :: pdq_scav(ngrid,nlayer,nq) ! tendency due to scavenging by co2
1046	REAL,INTENT(OUT) :: pdqsc(ngrid,nq) ! tendency on surface tracers
1047
1048	c Locals:
1049	INTEGER l,ig
1050	REAL scav_ratio_dust, scav_ratio_wice ! ratio of the dust/water ice mass mixing ratios in condensing CO2 ice and in air
1051	REAL scav_dust_mass(nlayer+1) ! dust flux (mass) scavenged towards the lower layer (kg/m2/s) (POSITIVE WHEN DOWNWARD)
1052	REAL scav_dust_number(nlayer+1) ! dust flux (number) scavenged towards the lower layer (kg/m2/s) (POSITIVE WHEN DOWNWARD)
1053	REAL scav_ccn_mass(nlayer+1) ! ccn flux (mass) scavenged towards the lower layer
1054	REAL scav_ccn_number(nlayer+1) ! ccn flux (number) scavenged towards the lower layer
1055	REAL scav_h2o_ice(nlayer+1) ! water ice flux (mass) scavenged towards the lower layer
1056	REAL massl ! mass of the layer l at point ig (kg/m2)
1057
1058	c Initialization:
1059	scav_ratio_dust = 20 !1 !10 !100 !1000 ! the scavenging ratio value of 20 is a good compromise to remove the dust in the polar night
1060	scav_ratio_wice = scav_ratio_dust ! while not drying up the water cycle (which occurs at scav_ratio_wice values above 50 at least)
1061	pdq_scav(:,:,:)=0.
1062	pdqsc(:,:)=0.
1063
1064	DO ig=1,ngrid
1065	scav_dust_mass(nlayer+1)=0.
1066	scav_dust_number(nlayer+1)=0.
1067	scav_ccn_mass(nlayer+1)=0.
1068	scav_ccn_number(nlayer+1)=0.
1069	scav_h2o_ice(nlayer+1)=0.
1070
1071	DO l=nlayer , 1, -1
1072	massl=(pplev(ig,l)-pplev(ig,l+1))/g
1073	IF(pcondicea(ig,l).GT.0.)THEN ! if CO2 condenses and traps dust/water ice
1074	! Calculation of the tendencies
1075	if (freedust) then
1076	pdq_scav(ig,l,igcm_dust_mass)=-pq(ig,l,igcm_dust_mass)
1077	& /ptimestep*(1-exp(
1078	& -scav_ratio_dustpcondicea(ig,l)ptimestep/massl))
1079
1080	pdq_scav(ig,l,igcm_dust_number)=pdq_scav(ig,l,igcm_dust_mass)
1081	& *r3n_q/rdust(ig,l)
1082	endif
1083	if (freedust.AND.microphys) then
1084	pdq_scav(ig,l,igcm_ccn_mass)=-pq(ig,l,igcm_ccn_mass)
1085	& /ptimestep*(1-exp(
1086	& -scav_ratio_wicepcondicea(ig,l)ptimestep/massl))
1087	pdq_scav(ig,l,igcm_ccn_number)=pdq_scav(ig,l,igcm_ccn_mass)
1088	& *r3n_q/rdust(ig,l)
1089	endif
1090	if (water) then
1091	pdq_scav(ig,l,igcm_h2o_ice)=-pq(ig,l,igcm_h2o_ice)
1092	& /ptimestep*(1-exp(
1093	& -scav_ratio_wicepcondicea(ig,l)ptimestep/massl))
1094	endif
1095
1096	ELSE IF(pcondicea(ig,l).LT.0.)THEN ! if CO2 sublimates and releases dust/water ice
1097	! Calculation of the tendencies
1098	if (freedust) then
1099	pdq_scav(ig,l,igcm_dust_mass)=-pcondicea(ig,l)/massl*
1100	& scav_dust_mass(l+1)/pfallice(ig,l+1)
1101
1102	pdq_scav(ig,l,igcm_dust_number)=-pcondicea(ig,l)/massl*
1103	& scav_dust_number(l+1)/pfallice(ig,l+1)
1104	endif
1105	if (freedust.AND.microphys) then
1106	pdq_scav(ig,l,igcm_ccn_mass)=-pcondicea(ig,l)/massl*
1107	& scav_ccn_mass(l+1)/pfallice(ig,l+1)
1108
1109	pdq_scav(ig,l,igcm_ccn_number)=-pcondicea(ig,l)/massl*
1110	& scav_ccn_number(l+1)/pfallice(ig,l+1)
1111	endif
1112	if (water) then
1113	pdq_scav(ig,l,igcm_h2o_ice)=-pcondicea(ig,l)/massl*
1114	& scav_h2o_ice(l+1)/pfallice(ig,l+1)
1115	endif
1116
1117	END IF
1118	! Calculation of the scavenged dust/wice flux towards the lower layers
1119	if (freedust) then
1120	scav_dust_mass(l)=-pdq_scav(ig,l,igcm_dust_mass)*massl
1121	& +scav_dust_mass(l+1)
1122
1123	scav_dust_number(l)=-pdq_scav(ig,l,igcm_dust_number)*massl
1124	& +scav_dust_number(l+1)
1125	endif
1126	if (freedust.AND.microphys) then
1127	scav_ccn_mass(l)=-pdq_scav(ig,l,igcm_ccn_mass)*massl
1128	& +scav_ccn_mass(l+1)
1129
1130	scav_ccn_number(l)=-pdq_scav(ig,l,igcm_ccn_number)*massl
1131	& +scav_dust_number(l+1)
1132	endif
1133	if (water) then
1134	scav_h2o_ice(l)=-pdq_scav(ig,l,igcm_h2o_ice)*massl
1135	& +scav_h2o_ice(l+1)
1136	endif
1137
1138	ENDDO
1139	! Calculation of the surface tendencies
1140	if (freedust) then
1141	pdqsc(ig,igcm_dust_mass)=pdqsc(ig,igcm_dust_mass)
1142	& +scav_dust_mass(1)
1143	pdqsc(ig,igcm_dust_number)=pdqsc(ig,igcm_dust_number)
1144	& +scav_dust_number(1)
1145	endif
1146	if (freedust.AND.microphys) then
1147	pdqsc(ig,igcm_dust_mass)=pdqsc(ig,igcm_dust_mass)
1148	& +scav_ccn_mass(1)
1149	pdqsc(ig,igcm_dust_number)=pdqsc(ig,igcm_dust_number)
1150	& +scav_ccn_number(1)
1151	endif
1152	if (water) then
1153	pdqsc(ig,igcm_h2o_ice)=scav_h2o_ice(1)
1154	endif
1155
1156	ENDDO ! loop on ngrid
1157
1158	END SUBROUTINE scavenging_by_co2
1159
1160	END MODULE co2condens_mod

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