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co2condens_mod.F @ 2189

Last change on this file since 2189 was 2189, checked in by emillour, 5 years ago
Mars GCM: Bug fix in the scavenging routine (missing initialisation of tendencies of surface tracers) in co2condens. EM
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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
7	CONTAINS
8
9	SUBROUTINE co2condens(ngrid,nlayer,nq,ptimestep,
10	$ pcapcal,pplay,pplev,ptsrf,pt,
11	$ pphi,pdt,pdu,pdv,pdtsrf,pu,pv,pq,pdq,
12	$ piceco2,psolaralb,pemisurf,rdust,
13	$ pdtc,pdtsrfc,pdpsrf,pduc,pdvc,pdqc,
14	$ fluxsurf_sw,zls,
15	$ zdqssed_co2,pcondicea_co2microp,
16	$ zdtcloudco2,pdqsc)
17
18	use tracer_mod, only: noms, igcm_h2o_ice,
19	& igcm_dust_mass, igcm_dust_number,
20	& igcm_ccn_mass, igcm_ccn_number
21	use surfdat_h, only: emissiv, phisfi
22	use geometry_mod, only: latitude, ! grid point latitudes (rad)
23	& longitude_deg, latitude_deg
24	use planete_h, only: obliquit
25	use comcstfi_h, only: cpp, g, r, pi
26
27	#ifndef MESOSCALE
28	USE vertical_layers_mod, ONLY: ap, bp
29	#endif
30	IMPLICIT NONE
31	c=======================================================================
32	c subject:
33	c --------
34	c Condensation/sublimation of CO2 ice on the ground and in the
35	c atmosphere
36	c (Scheme described in Forget et al., Icarus, 1998)
37	c
38	c author: Francois Forget 1994-1996 ; updated 1996 -- 2018
39	c ------
40	c adapted to external CO2 ice clouds scheme by Deborah Bardet (2018) '
41	c
42	c=======================================================================
43	c
44	c 0. Declarations :
45	c ------------------
46	c
47	include "callkeys.h"
48
49	c-----------------------------------------------------------------------
50	c Arguments :
51	c ---------
52	INTEGER,INTENT(IN) :: ngrid ! number of atmospheric columns
53	INTEGER,INTENT(IN) :: nlayer ! number of vertical layers
54	INTEGER,INTENT(IN) :: nq ! number of tracers
55
56	REAL,INTENT(IN) :: ptimestep ! physics timestep (s)
57	REAL,INTENT(IN) :: pcapcal(ngrid)
58	REAL,INTENT(IN) :: pplay(ngrid,nlayer) !mid-layer pressure (Pa)
59	REAL,INTENT(IN) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
60	REAL,INTENT(IN) :: ptsrf(ngrid) ! surface temperature (K)
61	REAL,INTENT(IN) :: pt(ngrid,nlayer) ! atmospheric temperature (K)
62	REAL,INTENT(IN) :: pphi(ngrid,nlayer) ! geopotential (m2.s-2)
63	REAL,INTENT(IN) :: pdt(ngrid,nlayer) ! tendency on temperature from
64	! previous physical processes (K/s)
65	REAL,INTENT(IN) :: pdu(ngrid,nlayer) ! tendency on zonal wind (m/s2)
66	! from previous physical processes
67	REAL,INTENT(IN) :: pdv(ngrid,nlayer) ! tendency on meridional wind (m/s2)
68	! from previous physical processes
69	REAL,INTENT(IN) :: pdtsrf(ngrid) ! tendency on surface temperature from
70	! previous physical processes (K/s)
71	REAL,INTENT(IN) :: pu(ngrid,nlayer) ! zonal wind (m/s)
72	REAL,INTENT(IN) :: pv(ngrid,nlayer) ! meridional wind (m/s)
73	REAL,INTENT(IN) :: pq(ngrid,nlayer,nq) ! tracers (../kg_air)
74	REAL,INTENT(IN) :: pdq(ngrid,nlayer,nq) ! tendency on tracers from
75	! previous physical processes
76
77	REAL,INTENT(IN) :: zdqssed_co2(ngrid) ! CO2 flux at the surface (kg.m-2.s-1)
78	REAL,INTENT(IN) :: pcondicea_co2microp(ngrid,nlayer)! tendency due to CO2 condensation (kg/kg.s-1)
79	REAL,INTENT(IN) :: zdtcloudco2(ngrid,nlayer) ! tendency on temperature due to latent heat
80
81	REAL,INTENT(INOUT) :: piceco2(ngrid) ! CO2 ice on the surface (kg.m-2)
82	REAL,INTENT(INOUT) :: psolaralb(ngrid,2) ! albedo of the surface
83	REAL,INTENT(INOUT) :: pemisurf(ngrid) ! emissivity of the surface
84	REAL,INTENT(IN) :: rdust(ngrid,nlayer) ! dust effective radius
85
86	! tendencies due to CO2 condensation/sublimation:
87	REAL,INTENT(OUT) :: pdtc(ngrid,nlayer) ! tendency on temperature (K/s)
88	REAL,INTENT(OUT) :: pdtsrfc(ngrid) ! tendency on surface temperature (K/s)
89	REAL,INTENT(OUT) :: pdpsrf(ngrid) ! tendency on surface pressure (Pa/s)
90	REAL,INTENT(OUT) :: pduc(ngrid,nlayer) ! tendency on zonal wind (m.s-2)
91	REAL,INTENT(OUT) :: pdvc(ngrid,nlayer) ! tendency on meridional wind (m.s-2)
92	REAL,INTENT(OUT) :: pdqc(ngrid,nlayer,nq) ! tendency on tracers
93	REAL,INTENT(OUT) :: pdqsc(ngrid,nq) ! tendency on surface tracers
94
95	! added to calculate flux dependent albedo:
96	REAL,intent(in) :: fluxsurf_sw(ngrid,2)
97	real,intent(in) :: zls ! solar longitude (rad)
98
99	c
100	c Local variables :
101	c -----------------
102
103	INTEGER i,j
104	INTEGER l,ig,iq,icap
105	REAL zt(ngrid,nlayer)
106	REAL zcpi
107	REAL ztcond (ngrid,nlayer+1) ! CO2 condensation temperature (atm)
108	REAL ztcondsol(ngrid) ! CO2 condensation temperature (surface)
109	REAL zdiceco2(ngrid)
110	REAL zcondicea(ngrid,nlayer) ! condensation rate in layer l (kg/m2/s)
111	REAL zcondices(ngrid) ! condensation rate on the ground (kg/m2/s)
112	REAL zfallice(ngrid,nlayer+1) ! amount of ice falling from layer l (kg/m2/s)
113	REAL zfallheat
114	REAL zmflux(nlayer+1)
115	REAL zu(nlayer),zv(nlayer)
116	REAL zqc(nlayer,nq),zq1(nlayer)
117	REAL ztsrf(ngrid)
118	REAL ztc(nlayer), ztm(nlayer+1)
119	REAL zum(nlayer+1) , zvm(nlayer+1)
120	REAL zqm(nlayer+1,nq),zqm1(nlayer+1)
121	REAL masse(nlayer),w(nlayer+1)
122	REAL Sm(nlayer),Smq(nlayer,nq),mixmas,qmix
123	REAL availco2
124	LOGICAL condsub(ngrid)
125
126	real :: emisref(ngrid)
127
128	REAL zdq_scav(ngrid,nlayer,nq) ! tendancy due to scavenging by co2
129	REAL zq(ngrid,nlayer,nq)
130
131	c variable speciale diagnostique
132	real tconda1(ngrid,nlayer)
133	real tconda2(ngrid,nlayer)
134	c REAL zdiceco2a(ngrid) ! for diagnostic only
135	real zdtsig (ngrid,nlayer)
136	real zdt (ngrid,nlayer)
137	real vmr_co2(ngrid,nlayer) ! co2 volume mixing ratio
138	! improved_ztcond flag: If set to .true. (AND running with a 'co2' tracer)
139	! then condensation temperature is computed using partial pressure of CO2
140	logical,parameter :: improved_ztcond=.true.
141
142	c local saved variables
143	integer,save :: ico2 ! index of CO2 tracer
144	real,save :: qco2,mmean
145	real,parameter :: latcond=5.9e5 ! (J/kg) Latent heat of solid CO2 ice
146	real,parameter :: tcond1mb=136.27 ! condensation temperature (K) at 1 mbar
147	real,parameter :: cpice=1000. ! (J.kg-1.K-1) specific heat of CO2 ice
148	REAL,SAVE :: acond,bcond,ccond
149	real,save :: m_co2, m_noco2, A , B
150
151	LOGICAL,SAVE :: firstcall = .true. !,firstcall2=.true.
152
153	c D.BARDET: for debug
154	real ztc3D(ngrid,nlayer)
155	REAL ztm3D(ngrid,nlayer)
156	REAL zmflux3D(ngrid,nlayer)
157	c----------------------------------------------------------------------
158
159	c Initialisation
160	c --------------
161	c
162	! AS: firstcall OK absolute
163	IF (firstcall) THEN
164
165	bcond=1./tcond1mb
166	ccond=cpp/(g*latcond)
167	acond=r/latcond
168
169	firstcall=.false.
170	write(,) 'CO2condens: improved_ztcond=',improved_ztcond
171	PRINT*,'In co2condens:Tcond(P=1mb)=',tcond1mb,' Lcond=',latcond
172	PRINT*,'acond,bcond,ccond',acond,bcond,ccond
173
174	ico2=0
175
176	if (tracer) then
177	c Prepare Special treatment if one of the tracer is CO2 gas
178	do iq=1,nq
179	if (noms(iq).eq."co2") then
180	ico2=iq
181	m_co2 = 44.01E-3 ! CO2 molecular mass (kg/mol)
182	m_noco2 = 33.37E-3 ! Non condensible mol mass (kg/mol)
183	c Compute A and B coefficient use to compute
184	c mean molecular mass Mair defined by
185	c 1/Mair = q(ico2)/m_co2 + (1-q(ico2))/m_noco2
186	c 1/Mair = A*q(ico2) + B
187	A =(1/m_co2 - 1/m_noco2)
188	B=1/m_noco2
189	endif
190	enddo
191	end if
192	ENDIF ! of IF (firstcall)
193	zcpi=1./cpp
194
195	c
196	c======================================================================
197	c Calcul of CO2 condensation sublimation
198	c ============================================================
199	c
200	c Used variable :
201	c piceco2(ngrid) : amount of co2 ice on the ground (kg/m2)
202	c zcondicea(ngrid,l): condensation rate in layer l (kg/m2/s)
203	c zcondices(ngrid): condensation rate on the ground (kg/m2/s)
204	c zfallice(ngrid,l):amount of ice falling from layer l (kg/m2/s)
205	c
206	c pdtc(ngrid,nlayer) : dT/dt due to cond/sub
207	c
208	c
209	c Tendencies set to 0
210	c -------------------------------------
211	zcondicea(1:ngrid,1:nlayer) = 0.
212	zfallice(1:ngrid,1:nlayer+1) = 0.
213	pduc(1:ngrid,1:nlayer) = 0
214	pdvc(1:ngrid,1:nlayer) = 0
215	pdtc(1:ngrid,1:nlayer) = 0.
216	pdqsc(1:ngrid,1:nq) = 0
217
218	pdqc(1:ngrid,1:nlayer,1:nq) = 0
219
220	zcondices(1:ngrid) = 0.
221	pdtsrfc(1:ngrid) = 0.
222	pdpsrf(1:ngrid) = 0.
223	condsub(1:ngrid) = .false.
224	zdiceco2(1:ngrid) = 0.
225
226	zfallheat=0
227
228	zdq_scav(:,:,:)=0.
229
230	c Update tendencies from previous processes
231	c -------------------------------------
232	DO l=1,nlayer
233	DO ig=1,ngrid
234	zt(ig,l)=pt(ig,l)+ pdt(ig,l)*ptimestep
235	do iq=1,nq
236	zq(ig,l,iq)=pq(ig,l,iq)+pdq(ig,l,iq)*ptimestep
237	enddo
238	ENDDO
239	ENDDO
240
241	c *************************
242	c ATMOSPHERIC CONDENSATION
243	c *************************
244
245	c Compute CO2 Volume mixing ratio
246	c -------------------------------
247	if (improved_ztcond.and.(ico2.ne.0)) then
248	DO l=1,nlayer
249	DO ig=1,ngrid
250	qco2=pq(ig,l,ico2)+pdq(ig,l,ico2)*ptimestep
251	c Mean air molecular mass = 1/(q(ico2)/m_co2 + (1-q(ico2))/m_noco2)
252	mmean=1/(A*qco2 +B)
253	vmr_co2(ig,l) = qco2*mmean/m_co2
254	ENDDO
255	ENDDO
256	else
257	DO l=1,nlayer
258	DO ig=1,ngrid
259	vmr_co2(ig,l)=0.95
260	ENDDO
261	ENDDO
262	endif
263
264	IF (.NOT. co2clouds) then
265	c forecast of atmospheric temperature zt and frost temperature ztcond
266	c --------------------------------------------------------------------
267
268	DO l=1,nlayer
269	DO ig=1,ngrid
270	! ztcond(ig,l)=1./(bcond-acondlog(.0095pplay(ig,l)))
271	if (pplay(ig,l).ge.1e-4) then
272	ztcond(ig,l)=
273	& 1./(bcond-acondlog(.01vmr_co2(ig,l)*pplay(ig,l)))
274	else
275	ztcond(ig,l)=0.0 !mars Monica
276	endif
277	ENDDO
278	ENDDO
279
280	ztcond(:,nlayer+1)=ztcond(:,nlayer)
281
282	c Condensation/sublimation in the atmosphere
283	c ------------------------------------------
284	c (calcul of zcondicea , zfallice and pdtc)
285	c
286	DO l=nlayer , 1, -1
287	DO ig=1,ngrid
288	pdtc(ig,l)=0.
289	IF((zt(ig,l).LT.ztcond(ig,l)).or.(zfallice(ig,l+1).gt.0))THEN
290	condsub(ig)=.true.
291	IF (zfallice(ig,l+1).gt.0) then
292	zfallheat=zfallice(ig,l+1)*
293	& (pphi(ig,l+1)-pphi(ig,l) +
294	& cpice*(ztcond(ig,l+1)-ztcond(ig,l)))/latcond
295	ELSE
296	zfallheat=0.
297	ENDIF
298	pdtc(ig,l)=(ztcond(ig,l) - zt(ig,l))/ptimestep
299	zcondicea(ig,l)=(pplev(ig,l)-pplev(ig,l+1))
300	& ccondpdtc(ig,l)- zfallheat
301	c Case when the ice from above sublimes entirely
302	c """""""""""""""""""""""""""""""""""""""""""""""
303	IF (zfallice(ig,l+1).lt.- zcondicea(ig,l)) then
304	pdtc(ig,l)=(-zfallice(ig,l+1)+zfallheat)/
305	& (ccond*(pplev(ig,l)-pplev(ig,l+1)))
306	zcondicea(ig,l)= -zfallice(ig,l+1)
307	END IF
308
309	zfallice(ig,l) = zcondicea(ig,l)+zfallice(ig,l+1)
310	END IF
311	ENDDO
312	ENDDO
313
314	if (scavco2cond) then
315	call scavenging_by_co2(ngrid,nlayer,nq,ptimestep,pplev,zq,
316	& rdust,zcondicea,zfallice,zdq_scav,pdqsc)
317	endif
318
319	ELSE ! if co2 clouds
320	DO ig=1,ngrid
321	zfallice(ig,1) = zdqssed_co2(ig)
322	ENDDO
323	DO l=nlayer , 1, -1
324	DO ig=1,ngrid
325	zcondicea(ig,l) = pcondicea_co2microp(ig,l)*
326	& (pplev(ig,l) - pplev(ig,l+1))/g
327	ENDDO
328	ENDDO
329
330	ENDIF ! end of if co2clouds
331
332	call WRITEdiagfi(ngrid,"pdtc_atm",
333	& "temperature tendency due to CO2 condensation",
334	& " ",3,pdtc)
335
336	call WRITEdiagfi(ngrid,"zcondicea",
337	& "",
338	& " ",3,zcondicea)
339
340	call WRITEdiagfi(ngrid,"zfallice",
341	& "",
342	& " ",2,zfallice(ngrid,1))
343
344
345	c *************************
346	c SURFACE CONDENSATION
347	c *************************
348
349	c forecast of ground temperature ztsrf and frost temperature ztcondsol
350	c --------------------------------------------------------------------
351	DO ig=1,ngrid
352	ztcondsol(ig)=
353	& 1./(bcond-acondlog(.01vmr_co2(ig,1)*pplev(ig,1)))
354	ztsrf(ig) = ptsrf(ig) + pdtsrf(ig)*ptimestep
355	ENDDO
356
357	c
358	c Condensation/sublimation on the ground
359	c --------------------------------------
360	c (compute zcondices and pdtsrfc)
361	c
362	DO ig=1,ngrid
363	IF(latitude(ig).lt.0) THEN
364	! Southern hemisphere
365	icap=2
366	ELSE
367	! Northern hemisphere
368	icap=1
369	ENDIF
370
371	c
372	c Loop on where we have condensation/ sublimation
373	IF ((ztsrf(ig) .LT. ztcondsol(ig)) .OR. ! ground cond
374	$ (zfallice(ig,1).NE.0.) .OR. ! falling snow
375	$ ((ztsrf(ig) .GT. ztcondsol(ig)) .AND. ! ground sublim.
376	$ ((piceco2(ig)+zfallice(ig,1)*ptimestep) .NE. 0.))) THEN
377	condsub(ig) = .true.
378
379	IF (zfallice(ig,1).gt.0) then
380	zfallheat=zfallice(ig,1)*
381	& (pphi(ig,1)- phisfi(ig) +
382	& cpice*(ztcond(ig,1)-ztcondsol(ig)))/latcond
383	ELSE
384	zfallheat=0.
385	ENDIF
386
387	c condensation or partial sublimation of CO2 ice
388	c """""""""""""""""""""""""""""""""""""""""""""""
389	zcondices(ig)=pcapcal(ig)*(ztcondsol(ig)-ztsrf(ig))
390	& /(latcond*ptimestep) - zfallheat
391	pdtsrfc(ig) = (ztcondsol(ig) - ztsrf(ig))/ptimestep
392	zdiceco2(ig) = zcondices(ig) + zfallice(ig,1)
393
394	#ifdef MESOSCALE
395	print*, "not enough CO2 tracer in 1st layer to condense"
396	print*, ">>> to be implemented in the mesoscale case"
397	print*, "because this uses ap levels..."
398	#else
399	c If there is not enough CO2 tracer in 1st layer to condense
400	c """"""""""""""""""""""""""""""""""""""""""""""""""""""
401	IF(ico2.ne.0) then
402	c Available CO2 tracer in layer 1 at end of timestep (kg/m2)
403	availco2= pq(ig,1,ico2)*((ap(1)-ap(2))+
404	& (bp(1)-bp(2))(pplev(ig,1)/g-zdiceco2(ig)ptimestep))
405
406	IF ((zcondices(ig) + zcondicea(ig,1))*ptimestep
407	& .gt.availco2) then
408	zcondices(ig) = availco2/ptimestep -zcondicea(ig,1)
409	zdiceco2(ig) = zcondices(ig) + zfallice(ig,1)
410	pdtsrfc(ig)=(latcond/pcapcal(ig))*
411	& (zcondices(ig)+zfallheat)
412	ENDIF
413	ENDIF
414	#endif
415
416	c If the entire CO2 ice layer sublimes
417	c """"""""""""""""""""""""""""""""""""""""""""""""""""
418	c (including what has just condensed in the atmosphere)
419
420	IF((piceco2(ig)/ptimestep+zfallice(ig,1)).LE.
421	& -zcondices(ig))THEN
422	zcondices(ig) = -piceco2(ig)/ptimestep - zfallice(ig,1)
423	pdtsrfc(ig)=(latcond/pcapcal(ig))*
424	& (zcondices(ig)+zfallheat)
425	zdiceco2(ig) = zcondices(ig) + zfallice(ig,1)
426	END IF
427
428	c Changing CO2 ice amount and pressure :
429	c """"""""""""""""""""""""""""""""""""
430
431	piceco2(ig) = piceco2(ig) + zdiceco2(ig)*ptimestep
432	pdpsrf(ig) = -zdiceco2(ig)*g
433
434	IF(ABS(pdpsrf(ig)*ptimestep).GT.pplev(ig,1)) THEN
435	PRINT*,'STOP in condens'
436	PRINT*,'condensing more than total mass'
437	PRINT*,'Grid point ',ig
438	PRINT*,'Longitude(degrees): ',longitude_deg(ig)
439	PRINT*,'Latitude(degrees): ',latitude_deg(ig)
440	PRINT*,'Ps = ',pplev(ig,1)
441	PRINT*,'d Ps = ',pdpsrf(ig)
442	STOP
443	ENDIF
444	END IF ! if there is condensation/sublimation
445	ENDDO ! of DO ig=1,ngrid
446
447	c ********************************************************************
448	c Surface albedo and emissivity of the surface below the snow (emisref)
449	c ********************************************************************
450
451	! Check that amont of CO2 ice is not problematic
452	DO ig=1,ngrid
453	if(.not.piceco2(ig).ge.0.) THEN
454	if(piceco2(ig).le.-5.e-8) print*,
455	$ 'WARNING co2condens piceco2(',ig,')=', piceco2(ig)
456	piceco2(ig)=0.
457	endif
458	ENDDO
459
460	! Set albedo and emissivity of the surface
461	! ----------------------------------------
462	CALL albedocaps(zls,ngrid,piceco2,psolaralb,emisref)
463
464	! set pemisurf() to emissiv when there is bare surface (needed for co2snow)
465	DO ig=1,ngrid
466	if (piceco2(ig).eq.0) then
467	pemisurf(ig)=emissiv
468	endif
469	ENDDO
470
471	! firstcall2=.false.
472	c ***************************************************************
473	c Correction to account for redistribution between sigma or hybrid
474	c layers when changing surface pressure (and warming/cooling
475	c of the CO2 currently changing phase).
476	c *************************************************************
477
478	DO ig=1,ngrid
479	if (condsub(ig)) then
480	do l=1,nlayer
481	ztc(l) =zt(ig,l) +pdtc(ig,l) *ptimestep
482	zu(l) =pu(ig,l) +pdu( ig,l) *ptimestep
483	zv(l) =pv(ig,l) +pdv( ig,l) *ptimestep
484	do iq=1,nq
485	zqc(l,iq)=zq(ig,l,iq)+zdq_scav(ig,l,iq)*ptimestep ! zdq_scav=0 if watercloud=false
486	enddo
487	enddo
488
489	c Mass fluxes through the sigma levels (kg.m-2.s-1) (>0 when up)
490	c """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
491
492	zmflux(1) = -zcondices(ig)
493	DO l=1,nlayer
494	zmflux(l+1) = zmflux(l) -zcondicea(ig,l)
495	#ifndef MESOSCALE
496	& + (bp(l)-bp(l+1))*(zfallice(ig,1)-zmflux(1))
497	c zmflux set to 0 if very low to avoid: top layer is disappearing in v1ld
498	if (abs(zmflux(l+1)).lt.1E-13.OR.bp(l+1).eq.0.) zmflux(l+1)=0.
499	#else
500	if (abs(zmflux(l+1)).lt.1E-13) zmflux(l+1)=0.
501	#endif
502	END DO
503
504	#ifdef MESOSCALE
505	print*,"absurd mass set because bp not available"
506	print*,"TO BE FIXED"
507	#else
508	c Mass of each layer at the end of timestep
509	c -----------------------------------------
510	DO l=1,nlayer
511	masse(l)=( pplev(ig,l) - pplev(ig,l+1) +
512	& (bp(l)-bp(l+1))pdpsrf(ig)ptimestep)/g
513	END DO
514	#endif
515
516	c Corresponding fluxes for T,U,V,Q
517	c """"""""""""""""""""""""""""""""
518
519	c averaging operator for TRANSPORT
520	c """"""""""""""""""""""""""""""""
521	c Value transfert at the surface interface when condensation
522	c sublimation:
523	ztm(1) = ztsrf(ig) + pdtsrfc(ig)*ptimestep
524	zum(1) = 0
525	zvm(1) = 0
526	do iq=1,nq
527	zqm(1,iq)=0. ! most tracer do not condense !
528	enddo
529	c Special case if one of the tracer is CO2 gas
530	if (ico2.ne.0) zqm(1,ico2)=1. ! flux is 100% CO2
531
532	c Van Leer scheme:
533	DO l=1,nlayer+1
534	w(l)=-zmflux(l)*ptimestep
535	END DO
536	call vl1d(nlayer,ztc,2.,masse,w,ztm)
537	call vl1d(nlayer,zu ,2.,masse,w,zum)
538	call vl1d(nlayer,zv ,2.,masse,w,zvm)
539	do iq=1,nq
540	do l=1,nlayer
541	zq1(l)=zqc(l,iq)
542	enddo
543	zqm1(1)=zqm(1,iq)
544	call vl1d(nlayer,zq1,2.,masse,w,zqm1)
545	do l=2,nlayer
546	zqc(l,iq)=zq1(l)
547	zqm(l,iq)=zqm1(l)
548	enddo
549	enddo
550
551	c Surface condensation affects low winds
552	if (zmflux(1).lt.0) then
553	zum(1)= zu(1) * (w(1)/masse(1))
554	zvm(1)= zv(1) * (w(1)/masse(1))
555	if (w(1).gt.masse(1)) then ! ensure numerical stability
556	zum(1)= (zu(1)-zum(2))*masse(1)/w(1) + zum(2)
557	zvm(1)= (zv(1)-zvm(2))*masse(1)/w(1) + zvm(2)
558	end if
559	end if
560
561	ztm(nlayer+1)= ztc(nlayer) ! should not be used, but...
562	zum(nlayer+1)= zu(nlayer) ! should not be used, but...
563	zvm(nlayer+1)= zv(nlayer) ! should not be used, but...
564	do iq=1,nq
565	zqm(nlayer+1,iq)= zqc(nlayer,iq)
566	enddo
567
568	#ifdef MESOSCALE
569	!!!! AS: This part must be commented in the mesoscale model
570	!!!! AS: ... to avoid instabilities.
571	!!!! AS: you have to compile with -DMESOSCALE to do so
572	#else
573	c Tendencies on T, U, V, Q
574	c """"""""""""""""""""""""
575	DO l=1,nlayer
576	IF(.not. co2clouds) THEN
577	c Tendencies on T
578	zdtsig(ig,l) = (1/masse(l)) *
579	& ( zmflux(l)*(ztm(l) - ztc(l))
580	& - zmflux(l+1)*(ztm(l+1) - ztc(l))
581	& + zcondicea(ig,l)*(ztcond(ig,l)-ztc(l)) )
582	ELSE
583	zdtsig(ig,l) = (1/masse(l)) *
584	& ( zmflux(l)*(ztm(l) - ztc(l))
585	& - zmflux(l+1)*(ztm(l+1) - ztc(l)))
586	ENDIF
587	c D.BARDET: for diagnotics
588	zmflux3D(ig,l)=zmflux(l)
589	ztm3D(ig,l)=ztm(l)
590	ztc3D(ig,l)=ztc(l)
591
592	pdtc(ig,l) = pdtc(ig,l) + zdtsig(ig,l)
593
594	c Tendencies on U
595	pduc(ig,l) = (1/masse(l)) *
596	& ( zmflux(l)*(zum(l) - zu(l))
597	& - zmflux(l+1)*(zum(l+1) - zu(l)) )
598
599
600	c Tendencies on V
601	pdvc(ig,l) = (1/masse(l)) *
602	& ( zmflux(l)*(zvm(l) - zv(l))
603	& - zmflux(l+1)*(zvm(l+1) - zv(l)) )
604
605	END DO
606
607	#endif
608
609	c Tendencies on Q
610	do iq=1,nq
611	! if (noms(iq).eq.'co2') then
612	if (iq.eq.ico2) then
613	c SPECIAL Case when the tracer IS CO2 :
614	DO l=1,nlayer
615	pdqc(ig,l,iq)= (1/masse(l)) *
616	& ( zmflux(l)*(zqm(l,iq) - zqc(l,iq))
617	& - zmflux(l+1)*(zqm(l+1,iq) - zqc(l,iq))
618	& + zcondicea(ig,l)*(zqc(l,iq)-1.) )
619	END DO
620	else
621	DO l=1,nlayer
622	pdqc(ig,l,iq)= (1/masse(l)) *
623	& ( zmflux(l)*(zqm(l,iq) - zqc(l,iq))
624	& - zmflux(l+1)*(zqm(l+1,iq) - zqc(l,iq))
625	& + zcondicea(ig,l)*zqc(l,iq) )
626
627	pdqc(ig,l,iq)=pdqc(ig,l,iq)+zdq_scav(ig,l,iq) ! zdq_scav=0 if watercloud=false
628	END DO
629	end if
630	enddo
631
632	end if ! if (condsub)
633	END DO ! loop on ig
634
635	c ***************************************************************
636	c CO2 snow / clouds scheme
637	c ***************************************************************
638
639	call co2snow(ngrid,nlayer,ptimestep,emisref,condsub,pplev,
640	& zcondicea,zcondices,zfallice,pemisurf)
641
642	c ***************************************************************
643	c Ecriture des diagnostiques
644	c ***************************************************************
645
646	c DO l=1,nlayer
647	c DO ig=1,ngrid
648	c Taux de cond en kg.m-2.pa-1.s-1
649	c tconda1(ig,l)=zcondicea(ig,l)/(pplev(ig,l)-pplev(ig,l+1))
650	c Taux de cond en kg.m-3.s-1
651	c tconda2(ig,l)=tconda1(ig,l)pplay(ig,l)g/(r*pt(ig,l))
652	c END DO
653	c END DO
654	c call WRITEDIAGFI(ngrid,'tconda1',
655	c &'Taux de condensation CO2 atmospherique /Pa',
656	c & 'kg.m-2.Pa-1.s-1',3,tconda1)
657	c call WRITEDIAGFI(ngrid,'tconda2',
658	c &'Taux de condensation CO2 atmospherique /m',
659	c & 'kg.m-3.s-1',3,tconda2)
660
661	! output falling co2 ice in 1st layer:
662	! call WRITEDIAGFI(ngrid,'fallice',
663	! &'Precipitation of co2 ice',
664	! & 'kg.m-2.s-1',2,zfallice(1,1))
665
666	#ifndef MESOSCALE
667	! Extra special case for surface temperature tendency pdtsrfc:
668	! we want to fix the south pole temperature to CO2 condensation temperature
669	if (caps.and.(obliquit.lt.27.)) then
670	! check if last grid point is the south pole
671	if (abs(latitude(ngrid)-(-pi/2.)).lt.1.e-5) then
672	! NB: Updated surface pressure, at grid point 'ngrid', is
673	! ps(ngrid)=pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep
674	! write(,) "co2condens: South pole: latitude(ngrid)=",
675	! & latitude(ngrid)
676	ztcondsol(ngrid)=
677	& 1./(bcond-acondlog(.01vmr_co2(ngrid,1)*
678	& (pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep)))
679	pdtsrfc(ngrid)=(ztcondsol(ngrid)-ztsrf(ngrid))/ptimestep
680	endif
681	endif
682	#endif
683
684	END SUBROUTINE co2condens
685
686
687
688	c *****************************************************************
689	SUBROUTINE vl1d(nlayer,q,pente_max,masse,w,qm)
690	c
691	c
692	c Operateur de moyenne inter-couche pour calcul de transport type
693	c Van-Leer " pseudo amont " dans la verticale
694	c q,w sont des arguments d'entree pour le s-pg ....
695	c masse : masse de la couche Dp/g
696	c w : masse d'atm ``transferee'' a chaque pas de temps (kg.m-2)
697	c pente_max = 2 conseillee
698	c
699	c
700	c --------------------------------------------------------------------
701	IMPLICIT NONE
702
703	c
704	c
705	c
706	c Arguments:
707	c ----------
708	integer nlayer
709	real masse(nlayer),pente_max
710	REAL q(nlayer),qm(nlayer+1)
711	REAL w(nlayer+1)
712	c
713	c Local
714	c ---------
715	c
716	INTEGER l
717	c
718	real dzq(nlayer),dzqw(nlayer),adzqw(nlayer),dzqmax
719	real sigw, Mtot, MQtot
720	integer m
721	c integer ismax,ismin
722
723
724	c On oriente tout dans le sens de la pression
725	c W > 0 WHEN DOWN !!!!!!!!!!!!!
726
727	do l=2,nlayer
728	dzqw(l)=q(l-1)-q(l)
729	adzqw(l)=abs(dzqw(l))
730	enddo
731
732	do l=2,nlayer-1
733	if(dzqw(l)*dzqw(l+1).gt.0.) then
734	dzq(l)=0.5*(dzqw(l)+dzqw(l+1))
735	else
736	dzq(l)=0.
737	endif
738	dzqmax=pente_max*min(adzqw(l),adzqw(l+1))
739	dzq(l)=sign(min(abs(dzq(l)),dzqmax),dzq(l))
740	enddo
741
742	dzq(1)=0.
743	dzq(nlayer)=0.
744
745	do l = 1,nlayer-1
746
747	c Regular scheme (transfered mass < layer mass)
748	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
749	if(w(l+1).gt.0. .and. w(l+1).le.masse(l+1)) then
750	sigw=w(l+1)/masse(l+1)
751	qm(l+1)=(q(l+1)+0.5(1.-sigw)dzq(l+1))
752	else if(w(l+1).le.0. .and. -w(l+1).le.masse(l)) then
753	sigw=w(l+1)/masse(l)
754	qm(l+1)=(q(l)-0.5(1.+sigw)dzq(l))
755
756	c Extended scheme (transfered mass > layer mass)
757	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
758	else if(w(l+1).gt.0.) then
759	m=l+1
760	Mtot = masse(m)
761	MQtot = masse(m)*q(m)
762	do while ((m.lt.nlayer).and.(w(l+1).gt.(Mtot+masse(m+1))))
763	m=m+1
764	Mtot = Mtot + masse(m)
765	MQtot = MQtot + masse(m)*q(m)
766	end do
767	if (m.lt.nlayer) then
768	sigw=(w(l+1)-Mtot)/masse(m+1)
769	qm(l+1)= (1/w(l+1))(MQtot + (w(l+1)-Mtot)
770	& (q(m+1)+0.5(1.-sigw)dzq(m+1)) )
771	else
772	w(l+1) = Mtot
773	qm(l+1) = Mqtot / Mtot
774	write(,) 'top layer is disapearing !'
775	stop
776	end if
777	else ! if(w(l+1).lt.0)
778	m = l-1
779	Mtot = masse(m+1)
780	MQtot = masse(m+1)*q(m+1)
781	if (m.gt.0) then ! because some compilers will have problems
782	! evaluating masse(0)
783	do while ((m.gt.0).and.(-w(l+1).gt.(Mtot+masse(m))))
784	m=m-1
785	Mtot = Mtot + masse(m+1)
786	MQtot = MQtot + masse(m+1)*q(m+1)
787	if (m.eq.0) exit
788	end do
789	endif
790	if (m.gt.0) then
791	sigw=(w(l+1)+Mtot)/masse(m)
792	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)
793	& (q(m)-0.5(1.+sigw)dzq(m)) )
794	else
795	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)qm(1))
796	end if
797	end if
798	enddo
799
800	c boundary conditions (not used in co2condens !!)
801	c qm(nlayer+1)=0.
802	c if(w(1).gt.0.) then
803	c qm(1)=q(1)
804	c else
805	c qm(1)=0.
806	c end if
807
808	END SUBROUTINE vl1d
809
810	c *****************************************************************
811	SUBROUTINE scavenging_by_co2(ngrid,nlayer,nq,ptimestep,pplev,pq,
812	& rdust,pcondicea,pfallice,pdq_scav,pdqsc)
813
814	c
815	c
816	c Calcul de la quantite de poussiere lessivee par les nuages de CO2
817	c
818	c --------------------------------------------------------------------
819	use tracer_mod, only: nqmx, igcm_h2o_vap, igcm_h2o_ice,
820	& igcm_dust_mass, igcm_dust_number,
821	& igcm_ccn_mass, igcm_ccn_number,
822	& rho_dust, nuice_sed, nuice_ref,r3n_q
823	use comcstfi_h, only: g
824
825	IMPLICIT NONE
826	include "callkeys.h" ! for the flags water, microphys and freedust
827	c
828	c
829	c Arguments:
830	INTEGER,INTENT(IN) :: ngrid ! number of atmospheric columns
831	INTEGER,INTENT(IN) :: nlayer ! number of vertical layers
832	INTEGER,INTENT(IN) :: nq ! number of tracers
833	REAL,INTENT(IN) :: ptimestep ! physics timestep (s)
834	REAL,INTENT(IN) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
835	REAL,INTENT(IN) :: pq(ngrid,nlayer,nq)
836	REAL,INTENT(IN) :: rdust(ngrid,nlayer) ! dust effective radius
837	REAL,INTENT(IN) :: pcondicea(ngrid,nlayer) ! condensation rate in layer l (kg/m2/s)
838	REAL,INTENT(IN) :: pfallice(ngrid,nlayer+1) ! amount of ice falling from layer l (kg/m2/s)
839
840	REAL,INTENT(OUT) :: pdq_scav(ngrid,nlayer,nq) ! tendancy due to scavenging by co2
841	REAL,INTENT(OUT) :: pdqsc(ngrid,nq) ! tendency on surface tracers
842
843	c Locals:
844	INTEGER l,ig
845	REAL scav_ratio_dust, scav_ratio_wice ! ratio of the dust/water ice mass mixing ratios in condensing CO2 ice and in air
846	REAL scav_dust_mass(nlayer+1) ! dust flux (mass) scavenged towards the lower layer (kg/m2/s) (POSITIVE WHEN DOWNWARD)
847	REAL scav_dust_number(nlayer+1) ! dust flux (number) scavenged towards the lower layer (kg/m2/s) (POSITIVE WHEN DOWNWARD)
848	REAL scav_ccn_mass(nlayer+1) ! ccn flux (mass) scavenged towards the lower layer
849	REAL scav_ccn_number(nlayer+1) ! ccn flux (number) scavenged towards the lower layer
850	REAL scav_h2o_ice(nlayer+1) ! water ice flux (mass) scavenged towards the lower layer
851	REAL massl ! mass of the layer l at point ig (kg/m2)
852
853	c Initialization:
854	scav_ratio_dust = 100 !1 !10 !100 !1000
855	scav_ratio_wice = scav_ratio_dust
856	pdq_scav(:,:,:)=0.
857
858	DO ig=1,ngrid
859	scav_dust_mass(nlayer+1)=0.
860	scav_dust_number(nlayer+1)=0.
861	scav_ccn_mass(nlayer+1)=0.
862	scav_ccn_number(nlayer+1)=0.
863	scav_h2o_ice(nlayer+1)=0.
864
865	DO l=nlayer , 1, -1
866	massl=(pplev(ig,l)-pplev(ig,l+1))/g
867	IF(pcondicea(ig,l).GT.0.)THEN ! if CO2 condenses and traps dust/water ice
868	! Calculation of the tendencies
869	if (freedust) then
870	pdq_scav(ig,l,igcm_dust_mass)=-pq(ig,l,igcm_dust_mass)
871	& /ptimestep*(1-exp(
872	& -scav_ratio_dustpcondicea(ig,l)ptimestep/massl))
873
874	pdq_scav(ig,l,igcm_dust_number)=pdq_scav(ig,l,igcm_dust_mass)
875	& *r3n_q/rdust(ig,l)
876	endif
877	if (freedust.AND.microphys) then
878	pdq_scav(ig,l,igcm_ccn_mass)=-pq(ig,l,igcm_ccn_mass)
879	& /ptimestep*(1-exp(
880	& -scav_ratio_wicepcondicea(ig,l)ptimestep/massl))
881	pdq_scav(ig,l,igcm_ccn_number)=pdq_scav(ig,l,igcm_ccn_mass)
882	& *r3n_q/rdust(ig,l)
883	endif
884	if (water) then
885	pdq_scav(ig,l,igcm_h2o_ice)=-pq(ig,l,igcm_h2o_ice)
886	& /ptimestep*(1-exp(
887	& -scav_ratio_wicepcondicea(ig,l)ptimestep/massl))
888	endif
889
890	ELSE IF(pcondicea(ig,l).LT.0.)THEN ! if CO2 sublimates and releases dust/water ice
891	! Calculation of the tendencies
892	if (freedust) then
893	pdq_scav(ig,l,igcm_dust_mass)=-pcondicea(ig,l)/massl*
894	& scav_dust_mass(l+1)/pfallice(ig,l+1)
895
896	pdq_scav(ig,l,igcm_dust_number)=-pcondicea(ig,l)/massl*
897	& scav_dust_number(l+1)/pfallice(ig,l+1)
898	endif
899	if (freedust.AND.microphys) then
900	pdq_scav(ig,l,igcm_ccn_mass)=-pcondicea(ig,l)/massl*
901	& scav_ccn_mass(l+1)/pfallice(ig,l+1)
902
903	pdq_scav(ig,l,igcm_ccn_number)=-pcondicea(ig,l)/massl*
904	& scav_ccn_number(l+1)/pfallice(ig,l+1)
905	endif
906	if (water) then
907	pdq_scav(ig,l,igcm_h2o_ice)=-pcondicea(ig,l)/massl*
908	& scav_h2o_ice(l+1)/pfallice(ig,l+1)
909	endif
910
911	END IF
912	! Calculation of the scavenged dust/wice flux towards the lower layers
913	if (freedust) then
914	scav_dust_mass(l)=-pdq_scav(ig,l,igcm_dust_mass)*massl
915	& +scav_dust_mass(l+1)
916
917	scav_dust_number(l)=-pdq_scav(ig,l,igcm_dust_number)*massl
918	& +scav_dust_number(l+1)
919	endif
920	if (freedust.AND.microphys) then
921	scav_ccn_mass(l)=-pdq_scav(ig,l,igcm_ccn_mass)*massl
922	& +scav_ccn_mass(l+1)
923
924	scav_ccn_number(l)=-pdq_scav(ig,l,igcm_ccn_number)*massl
925	& +scav_dust_number(l+1)
926	endif
927	if (water) then
928	scav_h2o_ice(l)=-pdq_scav(ig,l,igcm_h2o_ice)*massl
929	& +scav_h2o_ice(l+1)
930	endif
931
932	ENDDO
933	! Calculation of the surface tendencies
934	pdqsc(ig,igcm_dust_mass)=0.
935	pdqsc(ig,igcm_dust_number)=0.
936
937	if (freedust) then
938	pdqsc(ig,igcm_dust_mass)=pdqsc(ig,igcm_dust_mass)
939	& +scav_dust_mass(1)
940	pdqsc(ig,igcm_dust_number)=pdqsc(ig,igcm_dust_number)
941	& +scav_dust_number(1)
942	endif
943	if (freedust.AND.microphys) then
944	pdqsc(ig,igcm_dust_mass)=pdqsc(ig,igcm_dust_mass)
945	& +scav_ccn_mass(1)
946	pdqsc(ig,igcm_dust_number)=pdqsc(ig,igcm_dust_number)
947	& +scav_ccn_number(1)
948	endif
949	if (water) then
950	pdqsc(ig,igcm_h2o_ice)=scav_h2o_ice(1)
951	endif
952	ENDDO
953
954	END SUBROUTINE scavenging_by_co2
955
956	END MODULE co2condens_mod

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