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co2condens_mod.F @ 2090

Last change on this file since 2090 was 2009, checked in by emillour, 6 years ago
Mars GCM: Cleanup "newcondens" (remove obsolete options), change its name to co2condens and turn it into a module. EM
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1	MODULE co2condens_mod
2
3	IMPLICIT NONE
4
5	CONTAINS
6
7	SUBROUTINE co2condens(ngrid,nlayer,nq,ptimestep,
8	$ pcapcal,pplay,pplev,ptsrf,pt,
9	$ pphi,pdt,pdu,pdv,pdtsrf,pu,pv,pq,pdq,
10	$ piceco2,psolaralb,pemisurf,
11	$ pdtc,pdtsrfc,pdpsrf,pduc,pdvc,pdqc,
12	$ fluxsurf_sw,zls,
13	$ zdqssed_co2,pcondicea_co2microp,
14	$ zdtcloudco2)
15
16	use tracer_mod, only: noms
17	use surfdat_h, only: emissiv, phisfi
18	use geometry_mod, only: latitude ! grid point latitudes (rad)
19	use planete_h, only: obliquit
20	use comcstfi_h, only: cpp, g, r, pi
21	#ifndef MESOSCALE
22	USE vertical_layers_mod, ONLY: bp
23	#endif
24	IMPLICIT NONE
25	c=======================================================================
26	c subject:
27	c --------
28	c Condensation/sublimation of CO2 ice on the ground and in the
29	c atmosphere
30	c (Scheme described in Forget et al., Icarus, 1998)
31	c
32	c author: Francois Forget 1994-1996 ; updated 1996 -- 2018
33	c ------
34	c adapted to external CO2 ice clouds scheme by Deborah Bardet (2018) '
35	c
36	c=======================================================================
37	c
38	c 0. Declarations :
39	c ------------------
40	c
41	include "callkeys.h"
42
43	c-----------------------------------------------------------------------
44	c Arguments :
45	c ---------
46	INTEGER,INTENT(IN) :: ngrid ! number of atmospheric columns
47	INTEGER,INTENT(IN) :: nlayer ! number of vertical layers
48	INTEGER,INTENT(IN) :: nq ! number of tracers
49
50	REAL,INTENT(IN) :: ptimestep ! physics timestep (s)
51	REAL,INTENT(IN) :: pcapcal(ngrid)
52	REAL,INTENT(IN) :: pplay(ngrid,nlayer) !mid-layer pressure (Pa)
53	REAL,INTENT(IN) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
54	REAL,INTENT(IN) :: ptsrf(ngrid) ! surface temperature (K)
55	REAL,INTENT(IN) :: pt(ngrid,nlayer) ! atmospheric temperature (K)
56	REAL,INTENT(IN) :: pphi(ngrid,nlayer) ! geopotential (m2.s-2)
57	REAL,INTENT(IN) :: pdt(ngrid,nlayer) ! tendency on temperature from
58	! previous physical processes (K/s)
59	REAL,INTENT(IN) :: pdu(ngrid,nlayer) ! tendency on zonal wind (m/s2)
60	! from previous physical processes
61	REAL,INTENT(IN) :: pdv(ngrid,nlayer) ! tendency on meridional wind (m/s2)
62	! from previous physical processes
63	REAL,INTENT(IN) :: pdtsrf(ngrid) ! tendency on surface temperature from
64	! previous physical processes (K/s)
65	REAL,INTENT(IN) :: pu(ngrid,nlayer) ! zonal wind (m/s)
66	REAL,INTENT(IN) :: pv(ngrid,nlayer) ! meridional wind (m/s)
67	REAL,INTENT(IN) :: pq(ngrid,nlayer,nq) ! tracers (../kg_air)
68	REAL,INTENT(IN) :: pdq(ngrid,nlayer,nq) ! tendency on tracers from
69	! previous physical processes
70
71	REAL,INTENT(IN) :: zdqssed_co2(ngrid) ! CO2 flux at the surface (kg.m-2.s-1)
72	REAL,INTENT(IN) :: pcondicea_co2microp(ngrid,nlayer)! tendency due to CO2 condensation (kg/kg.s-1)
73	REAL,INTENT(IN) :: zdtcloudco2(ngrid,nlayer) ! tendency on temperature due to latent heat
74
75	REAL,INTENT(INOUT) :: piceco2(ngrid) ! CO2 ice on the surface (kg.m-2)
76	REAL,INTENT(INOUT) :: psolaralb(ngrid,2) ! albedo of the surface
77	REAL,INTENT(INOUT) :: pemisurf(ngrid) ! emissivity of the surface
78
79	! tendencies due to CO2 condensation/sublimation:
80	REAL,INTENT(OUT) :: pdtc(ngrid,nlayer) ! tendency on temperature (K/s)
81	REAL,INTENT(OUT) :: pdtsrfc(ngrid) ! tendency on surface temperature (K/s)
82	REAL,INTENT(OUT) :: pdpsrf(ngrid) ! tendency on surface pressure (Pa/s)
83	REAL,INTENT(OUT) :: pduc(ngrid,nlayer) ! tendency on zonal wind (m.s-2)
84	REAL,INTENT(OUT) :: pdvc(ngrid,nlayer) ! tendency on meridional wind (m.s-2)
85	REAL,INTENT(OUT) :: pdqc(ngrid,nlayer,nq) ! tendency on tracers
86
87	! added to calculate flux dependent albedo:
88	REAL,intent(in) :: fluxsurf_sw(ngrid,2)
89	real,intent(in) :: zls ! solar longitude (rad)
90
91	c
92	c Local variables :
93	c -----------------
94
95	INTEGER i,j
96	INTEGER l,ig,iq,icap
97	REAL zt(ngrid,nlayer)
98	REAL zcpi
99	REAL ztcond (ngrid,nlayer+1) ! CO2 condensation temperature (atm)
100	REAL ztcondsol(ngrid) ! CO2 condensation temperature (surface)
101	REAL zdiceco2(ngrid)
102	REAL zcondicea(ngrid,nlayer) ! condensation rate in layer l (kg/m2/s)
103	REAL zcondices(ngrid) ! condensation rate on the ground (kg/m2/s)
104	REAL zfallice(ngrid,nlayer+1) ! amount of ice falling from layer l (kg/m2/s)
105	REAL zfallheat
106	REAL zmflux(nlayer+1)
107	REAL zu(nlayer),zv(nlayer)
108	REAL zq(nlayer,nq),zq1(nlayer)
109	REAL ztsrf(ngrid)
110	REAL ztc(nlayer), ztm(nlayer+1)
111	REAL zum(nlayer+1) , zvm(nlayer+1)
112	REAL zqm(nlayer+1,nq),zqm1(nlayer+1)
113	REAL masse(nlayer),w(nlayer+1)
114	REAL Sm(nlayer),Smq(nlayer,nq),mixmas,qmix
115	LOGICAL condsub(ngrid)
116
117	real :: emisref(ngrid)
118
119	c variable speciale diagnostique
120	real tconda1(ngrid,nlayer)
121	real tconda2(ngrid,nlayer)
122	c REAL zdiceco2a(ngrid) ! for diagnostic only
123	real zdtsig (ngrid,nlayer)
124	real zdt (ngrid,nlayer)
125	real vmr_co2(ngrid,nlayer) ! co2 volume mixing ratio
126	! improved_ztcond flag: If set to .true. (AND running with a 'co2' tracer)
127	! then condensation temperature is computed using partial pressure of CO2
128	logical,parameter :: improved_ztcond=.true.
129
130	c local saved variables
131	integer,save :: ico2 ! index of CO2 tracer
132	real,save :: qco2min,qco2,mmean
133	real,parameter :: latcond=5.9e5 ! (J/kg) Latent heat of solid CO2 ice
134	real,parameter :: tcond1mb=136.27 ! condensation temperature (K) at 1 mbar
135	real,parameter :: cpice=1000. ! (J.kg-1.K-1) specific heat of CO2 ice
136	REAL,SAVE :: acond,bcond,ccond
137	real,save :: m_co2, m_noco2, A , B
138
139	LOGICAL,SAVE :: firstcall = .true. !,firstcall2=.true.
140
141	c D.BARDET: to debug
142	real ztc3D(ngrid,nlayer)
143	REAL ztm3D(ngrid,nlayer)
144	REAL zmflux3D(ngrid,nlayer)
145	c----------------------------------------------------------------------
146
147	c Initialisation
148	c --------------
149	c
150	! AS: firstcall OK absolute
151	IF (firstcall) THEN
152
153	bcond=1./tcond1mb
154	ccond=cpp/(g*latcond)
155	acond=r/latcond
156
157	firstcall=.false.
158	write(,) 'Newcondens: improved_ztcond=',improved_ztcond
159	PRINT*,'In newcondens:Tcond(P=1mb)=',tcond1mb,' Lcond=',latcond
160	PRINT*,'acond,bcond,ccond',acond,bcond,ccond
161
162	ico2=0
163
164	if (tracer) then
165	c Prepare Special treatment if one of the tracer is CO2 gas
166	do iq=1,nq
167	if (noms(iq).eq."co2") then
168	ico2=iq
169	m_co2 = 44.01E-3 ! CO2 molecular mass (kg/mol)
170	m_noco2 = 33.37E-3 ! Non condensible mol mass (kg/mol)
171	c Compute A and B coefficient use to compute
172	c mean molecular mass Mair defined by
173	c 1/Mair = q(ico2)/m_co2 + (1-q(ico2))/m_noco2
174	c 1/Mair = A*q(ico2) + B
175	A =(1/m_co2 - 1/m_noco2)
176	B=1/m_noco2
177	endif
178	enddo
179	c minimum CO2 mix. ratio below which mixing occur with layer above:
180	qco2min =0.75
181	end if
182	ENDIF ! of IF (firstcall)
183	zcpi=1./cpp
184
185	c
186	c======================================================================
187	c Calcul of CO2 condensation sublimation
188	c ============================================================
189	c
190	c Used variable :
191	c piceco2(ngrid) : amount of co2 ice on the ground (kg/m2)
192	c zcondicea(ngrid,l): condensation rate in layer l (kg/m2/s)
193	c zcondices(ngrid): condensation rate on the ground (kg/m2/s)
194	c zfallice(ngrid,l):amount of ice falling from layer l (kg/m2/s)
195	c
196	c pdtc(ngrid,nlayer) : dT/dt due to cond/sub
197	c
198	c
199	c Tendencies set to 0 (except pdtc)
200	c -------------------------------------
201	DO l=1,nlayer
202	DO ig=1,ngrid
203	zcondicea(ig,l) = 0.
204	zfallice(ig,l) = 0.
205	pduc(ig,l) = 0
206	pdvc(ig,l) = 0
207	END DO
208	END DO
209
210	DO iq=1,nq
211	DO l=1,nlayer
212	DO ig=1,ngrid
213	pdqc(ig,l,iq) = 0
214	END DO
215	END DO
216	END DO
217
218	DO ig=1,ngrid
219	zfallice(ig,nlayer+1) = 0.
220	zcondices(ig) = 0.
221	pdtsrfc(ig) = 0.
222	pdpsrf(ig) = 0.
223	condsub(ig) = .false.
224	zdiceco2(ig) = 0.
225	ENDDO
226	zfallheat=0
227
228	c *************************
229	c ATMOSPHERIC CONDENSATION
230	c *************************
231
232	c Compute CO2 Volume mixing ratio
233	c -------------------------------
234	if (improved_ztcond.and.(ico2.ne.0)) then
235	DO l=1,nlayer
236	DO ig=1,ngrid
237	qco2=pq(ig,l,ico2)+pdq(ig,l,ico2)*ptimestep
238	c Mean air molecular mass = 1/(q(ico2)/m_co2 + (1-q(ico2))/m_noco2)
239	mmean=1/(A*qco2 +B)
240	vmr_co2(ig,l) = qco2*mmean/m_co2
241	ENDDO
242	ENDDO
243	else
244	DO l=1,nlayer
245	DO ig=1,ngrid
246	vmr_co2(ig,l)=0.95
247	ENDDO
248	ENDDO
249	end if
250
251	IF (.NOT. co2clouds) then
252	c forecast of atmospheric temperature zt and frost temperature ztcond
253	c --------------------------------------------------------------------
254
255	DO l=1,nlayer
256	DO ig=1,ngrid
257	zt(ig,l)=pt(ig,l)+ pdt(ig,l)*ptimestep
258	! ztcond(ig,l)=1./(bcond-acondlog(.0095pplay(ig,l)))
259	if (pplay(ig,l).ge.1e-4) then
260	ztcond(ig,l)=
261	& 1./(bcond-acondlog(.01vmr_co2(ig,l)*pplay(ig,l)))
262	else
263	ztcond(ig,l)=0.0 !mars Monica
264	endif
265	ENDDO
266	ENDDO
267
268	ztcond(:,nlayer+1)=ztcond(:,nlayer)
269
270	c Condensation/sublimation in the atmosphere
271	c ------------------------------------------
272	c (calcul of zcondicea , zfallice and pdtc)
273	c
274	DO l=nlayer , 1, -1
275	DO ig=1,ngrid
276	pdtc(ig,l)=0.
277	IF((zt(ig,l).LT.ztcond(ig,l)).or.(zfallice(ig,l+1).gt.0))THEN
278	condsub(ig)=.true.
279	IF (zfallice(ig,l+1).gt.0) then
280	zfallheat=zfallice(ig,l+1)*
281	& (pphi(ig,l+1)-pphi(ig,l) +
282	& cpice*(ztcond(ig,l+1)-ztcond(ig,l)))/latcond
283	ELSE
284	zfallheat=0.
285	ENDIF
286	pdtc(ig,l)=(ztcond(ig,l) - zt(ig,l))/ptimestep
287	zcondicea(ig,l)=(pplev(ig,l)-pplev(ig,l+1))
288	& ccondpdtc(ig,l)- zfallheat
289	c Case when the ice from above sublimes entirely
290	c """""""""""""""""""""""""""""""""""""""""""""""
291	IF (zfallice(ig,l+1).lt.- zcondicea(ig,l)) then
292	pdtc(ig,l)=(-zfallice(ig,l+1)+zfallheat)/
293	& (ccond*(pplev(ig,l)-pplev(ig,l+1)))
294	zcondicea(ig,l)= -zfallice(ig,l+1)
295	END IF
296
297	zfallice(ig,l) = zcondicea(ig,l)+zfallice(ig,l+1)
298	END IF
299	ENDDO
300	ENDDO
301
302	ELSE
303
304	DO ig=1,ngrid
305	zfallice(ig,1) = zdqssed_co2(ig)
306	ENDDO
307	DO l=nlayer , 1, -1
308	DO ig=1,ngrid
309	zcondicea(ig,l) = pcondicea_co2microp(ig,l)*
310	& (pplev(ig,l) - pplev(ig,l+1))/g
311	ENDDO
312	ENDDO
313	DO l=nlayer, 1, -1
314	DO ig=1, ngrid
315	zt(ig,l)=pt(ig,l)+ pdt(ig,l)*ptimestep
316	pdtc(ig,l)=0.
317	ENDDO
318	ENDDO
319	ENDIF ! if not co2clouds
320
321	call WRITEdiagfi(ngrid,"pdtc_atm",
322	& "temperature tendency due to CO2 condensation",
323	& " ",3,pdtc)
324
325	call WRITEdiagfi(ngrid,"zcondicea",
326	& "",
327	& " ",3,zcondicea)
328
329	call WRITEdiagfi(ngrid,"zfallice",
330	& "",
331	& " ",2,zfallice(ngrid,1))
332
333	c *************************
334	c SURFACE CONDENSATION
335	c *************************
336
337	c forecast of ground temperature ztsrf and frost temperature ztcondsol
338	c --------------------------------------------------------------------
339	DO ig=1,ngrid
340	ztcondsol(ig)=
341	& 1./(bcond-acondlog(.01vmr_co2(ig,1)*pplev(ig,1)))
342	ztsrf(ig) = ptsrf(ig) + pdtsrf(ig)*ptimestep
343	ENDDO
344
345	c
346	c Condensation/sublimation on the ground
347	c --------------------------------------
348	c (compute zcondices and pdtsrfc)
349	c
350	DO ig=1,ngrid
351	IF(latitude(ig).lt.0) THEN
352	! Southern hemisphere
353	icap=2
354	ELSE
355	! Northern hemisphere
356	icap=1
357	ENDIF
358
359	c
360	c Loop on where we have condensation/ sublimation
361	IF ((ztsrf(ig) .LT. ztcondsol(ig)) .OR. ! ground cond
362	$ (zfallice(ig,1).NE.0.) .OR. ! falling snow
363	$ ((ztsrf(ig) .GT. ztcondsol(ig)) .AND. ! ground sublim.
364	$ ((piceco2(ig)+zfallice(ig,1)*ptimestep) .NE. 0.))) THEN
365	condsub(ig) = .true.
366
367	IF (zfallice(ig,1).gt.0) then
368	zfallheat=zfallice(ig,1)*
369	& (pphi(ig,1)- phisfi(ig) +
370	& cpice*(ztcond(ig,1)-ztcondsol(ig)))/latcond
371	ELSE
372	zfallheat=0.
373	ENDIF
374
375	c condensation or partial sublimation of CO2 ice
376	c """""""""""""""""""""""""""""""""""""""""""""""
377	zcondices(ig)=pcapcal(ig)*(ztcondsol(ig)-ztsrf(ig))
378	& /(latcond*ptimestep) - zfallheat
379	pdtsrfc(ig) = (ztcondsol(ig) - ztsrf(ig))/ptimestep
380
381	c If the entire CO_2 ice layer sublimes
382	c """"""""""""""""""""""""""""""""""""""""""""""""""""
383	c (including what has just condensed in the atmosphere)
384
385	IF((piceco2(ig)/ptimestep+zfallice(ig,1)).LE.
386	& -zcondices(ig))THEN
387	zcondices(ig) = -piceco2(ig)/ptimestep - zfallice(ig,1)
388	pdtsrfc(ig)=(latcond/pcapcal(ig))*
389	& (zcondices(ig)+zfallheat)
390	END IF
391
392	c Changing CO2 ice amount and pressure :
393	c """"""""""""""""""""""""""""""""""""
394
395	zdiceco2(ig) = zcondices(ig) + zfallice(ig,1)
396	piceco2(ig) = piceco2(ig) + zdiceco2(ig)*ptimestep
397	pdpsrf(ig) = -zdiceco2(ig)*g
398
399	IF(ABS(pdpsrf(ig)*ptimestep).GT.pplev(ig,1)) THEN
400	PRINT*,'STOP in condens'
401	PRINT*,'condensing more than total mass'
402	PRINT*,'Grid point ',ig
403	PRINT*,'Ps = ',pplev(ig,1)
404	PRINT*,'d Ps = ',pdpsrf(ig)
405	STOP
406	ENDIF
407	END IF ! if there is condensation/sublimmation
408	ENDDO ! of DO ig=1,ngrid
409
410	c ********************************************************************
411	c Surface albedo and emissivity of the surface below the snow (emisref)
412	c ********************************************************************
413
414	! Check that amont of CO2 ice is not problematic
415	DO ig=1,ngrid
416	if(.not.piceco2(ig).ge.0.) THEN
417	if(piceco2(ig).le.-5.e-8) print*,
418	$ 'WARNING newcondens piceco2(',ig,')=', piceco2(ig)
419	piceco2(ig)=0.
420	endif
421	ENDDO
422
423	! Set albedo and emissivity of the surface
424	! ----------------------------------------
425	CALL albedocaps(zls,ngrid,piceco2,psolaralb,emisref)
426
427	! set pemisurf() to emissiv when there is bare surface (needed for co2snow)
428	DO ig=1,ngrid
429	if (piceco2(ig).eq.0) then
430	pemisurf(ig)=emissiv
431	endif
432	ENDDO
433
434	! firstcall2=.false.
435	c ***************************************************************
436	c Correction to account for redistribution between sigma or hybrid
437	c layers when changing surface pressure (and warming/cooling
438	c of the CO2 currently changing phase).
439	c *************************************************************
440
441	DO ig=1,ngrid
442	if (condsub(ig)) then
443	do l=1,nlayer
444	ztc(l) =zt(ig,l) +pdtc(ig,l) *ptimestep
445	zu(l) =pu(ig,l) +pdu( ig,l) *ptimestep
446	zv(l) =pv(ig,l) +pdv( ig,l) *ptimestep
447	do iq=1,nq
448	zq(l,iq)=pq(ig,l,iq)+pdq(ig,l,iq)*ptimestep
449	enddo
450	end do
451
452	c Mass fluxes through the sigma levels (kg.m-2.s-1) (>0 when up)
453	c """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
454
455	zmflux(1) = -zcondices(ig)
456	DO l=1,nlayer
457	zmflux(l+1) = zmflux(l) -zcondicea(ig,l)
458	#ifndef MESOSCALE
459	& + (bp(l)-bp(l+1))*(zfallice(ig,1)-zmflux(1))
460	c zmflux set to 0 if very low to avoid: top layer is disappearing in v1ld
461	if (abs(zmflux(l+1)).lt.1E-13.OR.bp(l+1).eq.0.) zmflux(l+1)=0.
462	#else
463	if (abs(zmflux(l+1)).lt.1E-13) zmflux(l+1)=0.
464	#endif
465	END DO
466
467	c Mass of each layer
468	c ------------------
469	DO l=1,nlayer
470	masse(l)=(pplev(ig,l) - pplev(ig,l+1))/g
471	END DO
472
473
474	c Corresponding fluxes for T,U,V,Q
475	c """"""""""""""""""""""""""""""""
476
477	c averaging operator for TRANSPORT
478	c """"""""""""""""""""""""""""""""
479	c Value transfert at the surface interface when condensation
480	c sublimation:
481	ztm(1) = ztsrf(ig) + pdtsrfc(ig)*ptimestep
482	zum(1) = 0
483	zvm(1) = 0
484	do iq=1,nq
485	zqm(1,iq)=0. ! most tracer do not condense !
486	enddo
487	c Special case if one of the tracer is CO2 gas
488	if (ico2.ne.0) zqm(1,ico2)=1. ! flux is 100% CO2
489
490	c Van Leer scheme:
491	DO l=1,nlayer+1
492	w(l)=-zmflux(l)*ptimestep
493	END DO
494	call vl1d(nlayer,ztc,2.,masse,w,ztm)
495	call vl1d(nlayer,zu ,2.,masse,w,zum)
496	call vl1d(nlayer,zv ,2.,masse,w,zvm)
497	do iq=1,nq
498	do l=1,nlayer
499	zq1(l)=zq(l,iq)
500	enddo
501	zqm1(1)=zqm(1,iq)
502	call vl1d(nlayer,zq1,2.,masse,w,zqm1)
503	do l=2,nlayer
504	zq( l,iq)=zq1(l)
505	zqm(l,iq)=zqm1(l)
506	enddo
507	enddo
508
509	c Surface condensation affects low winds
510	if (zmflux(1).lt.0) then
511	zum(1)= zu(1) * (w(1)/masse(1))
512	zvm(1)= zv(1) * (w(1)/masse(1))
513	if (w(1).gt.masse(1)) then ! ensure numerical stability
514	zum(1)= (zu(1)-zum(2))*masse(1)/w(1) + zum(2)
515	zvm(1)= (zv(1)-zvm(2))*masse(1)/w(1) + zvm(2)
516	end if
517	end if
518
519	ztm(nlayer+1)= ztc(nlayer) ! should not be used, but...
520	zum(nlayer+1)= zu(nlayer) ! should not be used, but...
521	zvm(nlayer+1)= zv(nlayer) ! should not be used, but...
522	do iq=1,nq
523	zqm(nlayer+1,iq)= zq(nlayer,iq)
524	enddo
525
526	#ifdef MESOSCALE
527	!!!! AS: This part must be commented in the mesoscale model
528	!!!! AS: ... to avoid instabilities.
529	!!!! AS: you have to compile with -DMESOSCALE to do so
530	#else
531	c Tendencies on T, U, V, Q
532	c """"""""""""""""""""""""
533	DO l=1,nlayer
534	IF(.not. co2clouds) THEN
535	c Tendencies on T
536	zdtsig(ig,l) = (1/masse(l)) *
537	& ( zmflux(l)*(ztm(l) - ztc(l))
538	& - zmflux(l+1)*(ztm(l+1) - ztc(l))
539	& + zcondicea(ig,l)*(ztcond(ig,l)-ztc(l)) )
540	ELSE
541	zdtsig(ig,l) = (1/masse(l)) *
542	& ( zmflux(l)*(ztm(l) - ztc(l))
543	& - zmflux(l+1)*(ztm(l+1) - ztc(l)))
544	ENDIF
545	c D.BARDET: for diagnotics
546	zmflux3D(ig,l)=zmflux(l)
547	ztm3D(ig,l)=ztm(l)
548	ztc3D(ig,l)=ztc(l)
549
550	pdtc(ig,l) = pdtc(ig,l) + zdtsig(ig,l)
551
552	c Tendencies on U
553	pduc(ig,l) = (1/masse(l)) *
554	& ( zmflux(l)*(zum(l) - zu(l))
555	& - zmflux(l+1)*(zum(l+1) - zu(l)) )
556
557
558	c Tendencies on V
559	pdvc(ig,l) = (1/masse(l)) *
560	& ( zmflux(l)*(zvm(l) - zv(l))
561	& - zmflux(l+1)*(zvm(l+1) - zv(l)) )
562
563	END DO
564
565	#endif
566
567	c Tendencies on Q
568	do iq=1,nq
569	! if (noms(iq).eq.'co2') then
570	if (iq.eq.ico2) then
571	c SPECIAL Case when the tracer IS CO2 :
572	DO l=1,nlayer
573	pdqc(ig,l,iq)= (1/masse(l)) *
574	& ( zmflux(l)*(zqm(l,iq) - zq(l,iq))
575	& - zmflux(l+1)*(zqm(l+1,iq) - zq(l,iq))
576	& + zcondicea(ig,l)*(zq(l,iq)-1.) )
577	END DO
578	else
579	DO l=1,nlayer
580	pdqc(ig,l,iq)= (1/masse(l)) *
581	& ( zmflux(l)*(zqm(l,iq) - zq(l,iq))
582	& - zmflux(l+1)*(zqm(l+1,iq) - zq(l,iq))
583	& + zcondicea(ig,l)*zq(l,iq) )
584	END DO
585	end if
586	enddo
587
588	end if ! if (condsub)
589	END DO ! loop on ig
590
591	c ***************************************************************
592	c CO2 snow / clouds scheme
593	c ***************************************************************
594
595	call co2snow(ngrid,nlayer,ptimestep,emisref,condsub,pplev,
596	& zcondicea,zcondices,zfallice,pemisurf)
597
598	c ***************************************************************
599	c Ecriture des diagnostiques
600	c ***************************************************************
601
602	c DO l=1,nlayer
603	c DO ig=1,ngrid
604	c Taux de cond en kg.m-2.pa-1.s-1
605	c tconda1(ig,l)=zcondicea(ig,l)/(pplev(ig,l)-pplev(ig,l+1))
606	c Taux de cond en kg.m-3.s-1
607	c tconda2(ig,l)=tconda1(ig,l)pplay(ig,l)g/(r*pt(ig,l))
608	c END DO
609	c END DO
610	c call WRITEDIAGFI(ngrid,'tconda1',
611	c &'Taux de condensation CO2 atmospherique /Pa',
612	c & 'kg.m-2.Pa-1.s-1',3,tconda1)
613	c call WRITEDIAGFI(ngrid,'tconda2',
614	c &'Taux de condensation CO2 atmospherique /m',
615	c & 'kg.m-3.s-1',3,tconda2)
616
617	! output falling co2 ice in 1st layer:
618	! call WRITEDIAGFI(ngrid,'fallice',
619	! &'Precipitation of co2 ice',
620	! & 'kg.m-2.s-1',2,zfallice(1,1))
621
622	#ifndef MESOSCALE
623	! Extra special case for surface temperature tendency pdtsrfc:
624	! we want to fix the south pole temperature to CO2 condensation temperature
625	if (caps.and.(obliquit.lt.27.)) then
626	! check if last grid point is the south pole
627	if (abs(latitude(ngrid)-(-pi/2.)).lt.1.e-5) then
628	! NB: Updated surface pressure, at grid point 'ngrid', is
629	! ps(ngrid)=pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep
630	! write(,) "newcondens: South pole: latitude(ngrid)=",
631	! & latitude(ngrid)
632	ztcondsol(ngrid)=
633	& 1./(bcond-acondlog(.01vmr_co2(ngrid,1)*
634	& (pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep)))
635	pdtsrfc(ngrid)=(ztcondsol(ngrid)-ztsrf(ngrid))/ptimestep
636	endif
637	endif
638	#endif
639
640	END SUBROUTINE co2condens
641
642
643
644	c *****************************************************************
645	SUBROUTINE vl1d(nlayer,q,pente_max,masse,w,qm)
646	c
647	c
648	c Operateur de moyenne inter-couche pour calcul de transport type
649	c Van-Leer " pseudo amont " dans la verticale
650	c q,w sont des arguments d'entree pour le s-pg ....
651	c masse : masse de la couche Dp/g
652	c w : masse d'atm ``transferee'' a chaque pas de temps (kg.m-2)
653	c pente_max = 2 conseillee
654	c
655	c
656	c --------------------------------------------------------------------
657	IMPLICIT NONE
658
659	c
660	c
661	c
662	c Arguments:
663	c ----------
664	integer nlayer
665	real masse(nlayer),pente_max
666	REAL q(nlayer),qm(nlayer+1)
667	REAL w(nlayer+1)
668	c
669	c Local
670	c ---------
671	c
672	INTEGER l
673	c
674	real dzq(nlayer),dzqw(nlayer),adzqw(nlayer),dzqmax
675	real sigw, Mtot, MQtot
676	integer m
677	c integer ismax,ismin
678
679
680	c On oriente tout dans le sens de la pression
681	c W > 0 WHEN DOWN !!!!!!!!!!!!!
682
683	do l=2,nlayer
684	dzqw(l)=q(l-1)-q(l)
685	adzqw(l)=abs(dzqw(l))
686	enddo
687
688	do l=2,nlayer-1
689	if(dzqw(l)*dzqw(l+1).gt.0.) then
690	dzq(l)=0.5*(dzqw(l)+dzqw(l+1))
691	else
692	dzq(l)=0.
693	endif
694	dzqmax=pente_max*min(adzqw(l),adzqw(l+1))
695	dzq(l)=sign(min(abs(dzq(l)),dzqmax),dzq(l))
696	enddo
697
698	dzq(1)=0.
699	dzq(nlayer)=0.
700
701	do l = 1,nlayer-1
702
703	c Regular scheme (transfered mass < layer mass)
704	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
705	if(w(l+1).gt.0. .and. w(l+1).le.masse(l+1)) then
706	sigw=w(l+1)/masse(l+1)
707	qm(l+1)=(q(l+1)+0.5(1.-sigw)dzq(l+1))
708	else if(w(l+1).le.0. .and. -w(l+1).le.masse(l)) then
709	sigw=w(l+1)/masse(l)
710	qm(l+1)=(q(l)-0.5(1.+sigw)dzq(l))
711
712	c Extended scheme (transfered mass > layer mass)
713	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
714	else if(w(l+1).gt.0.) then
715	m=l+1
716	Mtot = masse(m)
717	MQtot = masse(m)*q(m)
718	do while ((m.lt.nlayer).and.(w(l+1).gt.(Mtot+masse(m+1))))
719	m=m+1
720	Mtot = Mtot + masse(m)
721	MQtot = MQtot + masse(m)*q(m)
722	end do
723	if (m.lt.nlayer) then
724	sigw=(w(l+1)-Mtot)/masse(m+1)
725	qm(l+1)= (1/w(l+1))(MQtot + (w(l+1)-Mtot)
726	& (q(m+1)+0.5(1.-sigw)dzq(m+1)) )
727	else
728	w(l+1) = Mtot
729	qm(l+1) = Mqtot / Mtot
730	write(,) 'top layer is disapearing !'
731	stop
732	end if
733	else ! if(w(l+1).lt.0)
734	m = l-1
735	Mtot = masse(m+1)
736	MQtot = masse(m+1)*q(m+1)
737	if (m.gt.0) then ! because some compilers will have problems
738	! evaluating masse(0)
739	do while ((m.gt.0).and.(-w(l+1).gt.(Mtot+masse(m))))
740	m=m-1
741	Mtot = Mtot + masse(m+1)
742	MQtot = MQtot + masse(m+1)*q(m+1)
743	if (m.eq.0) exit
744	end do
745	endif
746	if (m.gt.0) then
747	sigw=(w(l+1)+Mtot)/masse(m)
748	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)
749	& (q(m)-0.5(1.+sigw)dzq(m)) )
750	else
751	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)qm(1))
752	end if
753	end if
754	enddo
755
756	c boundary conditions (not used in newcondens !!)
757	c qm(nlayer+1)=0.
758	c if(w(1).gt.0.) then
759	c qm(1)=q(1)
760	c else
761	c qm(1)=0.
762	c end if
763
764	END SUBROUTINE vl1d
765
766	END MODULE co2condens_mod

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