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newcondens.F @ 1242

Last change on this file since 1242 was 1226, checked in by aslmd, 11 years ago
LMDZ.MARS : Replaced comcstfi and planete includes by modules.
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1	SUBROUTINE newcondens(ngrid,nlayer,nq,ptimestep,
2	$ pcapcal,pplay,pplev,ptsrf,pt,
3	$ pphi,pdt,pdu,pdv,pdtsrf,pu,pv,pq,pdq,
4	$ piceco2,psolaralb,pemisurf,
5	$ pdtc,pdtsrfc,pdpsrf,pduc,pdvc,pdqc,
6	$ fluxsurf_sw,zls)
7
8	use tracer_mod, only: noms
9	use surfdat_h, only: emissiv, phisfi
10	use comgeomfi_h, only: lati ! grid point latitudes (rad)
11	use planete_h
12	USE comcstfi_h
13	IMPLICIT NONE
14	c=======================================================================
15	c subject:
16	c --------
17	c Condensation/sublimation of CO2 ice on the ground and in the
18	c atmosphere
19	c (Scheme described in Forget et al., Icarus, 1998)
20	c
21	c author: Francois Forget 1994-1996
22	c ------
23	c
24	c input:
25	c -----
26	c ngrid nombre de points de verticales
27	c (toutes les boucles de la physique sont au
28	c moins vectorisees sur ngrid)
29	c nlayer nombre de couches
30	c pplay(ngrid,nlayer) Pressure levels
31	c pplev(ngrid,nlayer+1) Pressure levels
32	c pt(ngrid,nlayer) temperature (en K)
33	c ptsrf(ngrid) temperature de surface
34	c
35	c \
36	c pdt(ngrid,nlayer)\ derivee temporelle physique avant condensation
37	c / ou sublimation pour pt,ptsrf
38	c pdtsrf(ngrid) /
39	c
40	c output:
41	c -------
42	c
43	c pdpsrf(ngrid) \ derivee temporelle physique (contribution de
44	c pdtc(ngrid,nlayer) / la condensation ou sublimation) pour Ps,pt,ptsrf
45	c pdtsrfc(ngrid) /
46	c
47	c Entree/sortie
48	c -------------
49	c
50	c piceco2(ngrid) : quantite de glace co2 au sol (kg/m2)
51	c psolaralb(ngrid,2) : albedo au sol
52	c pemisurf(ngrid) : emissivite du sol
53
54	c
55	c=======================================================================
56	c
57	c 0. Declarations :
58	c ------------------
59	c
60	#include "dimensions.h"
61	!#include "dimphys.h"
62	!#include "surfdat.h"
63	!#include "comgeomfi.h"
64	#include "comvert.h"
65	!#include "paramet.h"
66	#include "callkeys.h"
67	!#include "tracer.h"
68
69	c-----------------------------------------------------------------------
70	c Arguments :
71	c ---------
72	INTEGER,INTENT(IN) :: ngrid ! number of atmospheric columns
73	INTEGER,INTENT(IN) :: nlayer ! number of vertical layers
74	INTEGER,INTENT(IN) :: nq ! number of tracers
75
76	REAL,INTENT(IN) :: ptimestep ! physics timestep (s)
77	REAL,INTENT(IN) :: pcapcal(ngrid)
78	REAL,INTENT(IN) :: pplay(ngrid,nlayer) !mid-layer pressure (Pa)
79	REAL,INTENT(IN) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
80	REAL,INTENT(IN) :: ptsrf(ngrid) ! surface temperature (K)
81	REAL,INTENT(IN) :: pt(ngrid,nlayer) ! atmospheric temperature (K)
82	REAL,INTENT(IN) :: pphi(ngrid,nlayer) ! geopotential (m2.s-2)
83	REAL,INTENT(IN) :: pdt(ngrid,nlayer) ! tendency on temperature from
84	! previous physical processes (K/s)
85	REAL,INTENT(IN) :: pdu(ngrid,nlayer) ! tendency on zonal wind (m/s2)
86	! from previous physical processes
87	REAL,INTENT(IN) :: pdv(ngrid,nlayer) ! tendency on meridional wind (m/s2)
88	! from previous physical processes
89	REAL,INTENT(IN) :: pdtsrf(ngrid) ! tendency on surface temperature from
90	! previous physical processes (K/s)
91	REAL,INTENT(IN) :: pu(ngrid,nlayer) ! zonal wind (m/s)
92	REAL,INTENT(IN) :: pv(ngrid,nlayer) ! meridional wind (m/s)
93	REAL,INTENT(IN) :: pq(ngrid,nlayer,nq) ! tracers (../kg_air)
94	REAL,INTENT(IN) :: pdq(ngrid,nlayer,nq) ! tendency on tracers from
95	! previous physical processes
96	REAL,INTENT(INOUT) :: piceco2(ngrid) ! CO2 ice on the surface (kg.m-2)
97	REAL,INTENT(INOUT) :: psolaralb(ngrid,2) ! albedo of the surface
98	REAL,INTENT(INOUT) :: pemisurf(ngrid) ! emissivity of the surface
99
100	! tendencies due to CO2 condensation/sublimation:
101	REAL,INTENT(OUT) :: pdtc(ngrid,nlayer) ! tendency on temperature (K/s)
102	REAL,INTENT(OUT) :: pdtsrfc(ngrid) ! tendency on surface temperature (K/s)
103	REAL,INTENT(OUT) :: pdpsrf(ngrid) ! tendency on surface pressure (Pa/s)
104	REAL,INTENT(OUT) :: pduc(ngrid,nlayer) ! tendency on zonal wind (m.s-2)
105	REAL,INTENT(OUT) :: pdvc(ngrid,nlayer) ! tendency on meridional wind (m.s-2)
106	REAL,INTENT(OUT) :: pdqc(ngrid,nlayer,nq) ! tendency on 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	c variables used for albedo parametrization
117	c --------------------------------------------
118	INTEGER i,j
119	c REAL Fluxmean(jjp1)
120	INTEGER l,ig,iq,icap,nmix
121	LOGICAL transparency, fluxdependent
122	c flag transparency if you want to make the co2ice semi-transparent
123	PARAMETER(transparency=.true.)
124	c flag fluxdependent if you want the co2ice albedo to be dependent on
125	c the incident solar flux
126	PARAMETER(fluxdependent=.false.)
127	REAL slopy,alpha,constA,constB,constT,albediceF_new(ngrid)
128	REAL zt(ngrid,nlayer)
129	REAL zcpi
130	REAL ztcond (ngrid,nlayer+1) ! CO2 condensation temperature (atm)
131	REAL ztcondsol(ngrid) ! CO2 condensation temperature (surface)
132	REAL zdiceco2(ngrid)
133	REAL zcondicea(ngrid,nlayer)
134	REAL zcondices(ngrid)
135	REAL zfallice(ngrid,nlayer+1) , zfallheat
136	REAL zmflux(nlayer+1)
137	REAL zu(nlayer),zv(nlayer)
138	REAL zq(nlayer,nq),zq1(nlayer)
139	REAL ztsrf(ngrid)
140	REAL ztc(nlayer), ztm(nlayer+1)
141	REAL zum(nlayer+1) , zvm(nlayer+1)
142	REAL zqm(nlayer+1,nq),zqm1(nlayer+1)
143	REAL masse(nlayer),w(nlayer+1)
144	REAL Sm(nlayer),Smq(nlayer,nq),mixmas,qmix
145	LOGICAL condsub(ngrid)
146
147	real :: emisref(ngrid)
148
149	c variable speciale diagnostique
150	real tconda1(ngrid,nlayer)
151	real tconda2(ngrid,nlayer)
152	c REAL zdiceco2a(ngrid) ! for diagnostic only
153	real zdtsig (ngrid,nlayer)
154	real zdt (ngrid,nlayer)
155	real vmr_co2(ngrid,nlayer) ! co2 volume mixing ratio
156	! improved_ztcond flag: If set to .true. (AND running with a 'co2' tracer)
157	! then condensation temperature is computed using partial pressure of CO2
158	logical,parameter :: improved_ztcond=.true.
159	! Bound co2 (tracer) values...
160	logical,parameter :: bound_qco2=.false.
161	real,parameter :: qco2max=1.1
162	real,parameter :: qco2mini=0.1
163	real :: zqco2
164
165	c local saved variables
166	integer,save :: ico2 ! index of CO2 tracer
167	real,save :: qco2min,qco2,mmean
168	real,parameter :: latcond=5.9e5 ! (J/kg) Latent heat of solid CO2 ice
169	real,parameter :: tcond1mb=136.27 ! condensation temperature (K) at 1 mbar
170	real,parameter :: cpice=1000. ! (J.kg-1.K-1) specific heat of CO2 ice
171	REAL,SAVE :: acond,bcond,ccond
172	! REAL,SAVE :: albediceF(ngrid)
173	real,save :: m_co2, m_noco2, A , B
174
175	LOGICAL,SAVE :: firstcall = .true. !,firstcall2=.true.
176
177	integer flag
178
179	c----------------------------------------------------------------------
180
181	c Initialisation
182	c --------------
183	c
184	IF (firstcall) THEN
185
186	bcond=1./tcond1mb
187	ccond=cpp/(g*latcond)
188	acond=r/latcond
189
190	firstcall=.false.
191	write(,) 'Newcondens: improved_ztcond=',improved_ztcond
192	write(,) 'Newcondens: bound_qco2=',bound_qco2
193	PRINT*,'In newcondens:Tcond(P=1mb)=',tcond1mb,' Lcond=',latcond
194	PRINT*,'acond,bcond,ccond',acond,bcond,ccond
195
196	ico2=0
197
198	if (tracer) then
199	c Prepare Special treatment if one of the tracer is CO2 gas
200	do iq=1,nq
201	if (noms(iq).eq."co2") then
202	ico2=iq
203	m_co2 = 44.01E-3 ! CO2 molecular mass (kg/mol)
204	m_noco2 = 33.37E-3 ! Non condensible mol mass (kg/mol)
205	c Compute A and B coefficient use to compute
206	c mean molecular mass Mair defined by
207	c 1/Mair = q(ico2)/m_co2 + (1-q(ico2))/m_noco2
208	c 1/Mair = A*q(ico2) + B
209	A =(1/m_co2 - 1/m_noco2)
210	B=1/m_noco2
211	endif
212	enddo
213	c minimum CO2 mix. ratio below which mixing occur with layer above:
214	qco2min =0.75
215	end if
216	ENDIF ! of IF (firstcall)
217	zcpi=1./cpp
218
219	c
220	c======================================================================
221	c Calcul of CO2 condensation sublimation
222	c ============================================================
223	c
224	c Used variable :
225	c piceco2(ngrid) : amount of co2 ice on the ground (kg/m2)
226	c zcondicea(ngrid,l): condensation rate in layer l (kg/m2/s)
227	c zcondices(ngrid): condensation rate on the ground (kg/m2/s)
228	c zfallice(ngrid,l):amount of ice falling from layer l (kg/m2/s)
229	c
230	c pdtc(ngrid,nlayer) : dT/dt due to cond/sub
231	c
232	c
233	c Tendencies set to 0 (except pdtc)
234	c -------------------------------------
235	DO l=1,nlayer
236	DO ig=1,ngrid
237	zcondicea(ig,l) = 0.
238	zfallice(ig,l) = 0.
239	pduc(ig,l) = 0
240	pdvc(ig,l) = 0
241	END DO
242	END DO
243
244	DO iq=1,nq
245	DO l=1,nlayer
246	DO ig=1,ngrid
247	pdqc(ig,l,iq) = 0
248	END DO
249	END DO
250	END DO
251
252	DO ig=1,ngrid
253	zfallice(ig,nlayer+1) = 0.
254	zcondices(ig) = 0.
255	pdtsrfc(ig) = 0.
256	pdpsrf(ig) = 0.
257	condsub(ig) = .false.
258	zdiceco2(ig) = 0.
259	ENDDO
260	zfallheat=0
261
262	c *************************
263	c ATMOSPHERIC CONDENSATION
264	c *************************
265
266	c Compute CO2 Volume mixing ratio
267	c -------------------------------
268	if (improved_ztcond.and.(ico2.ne.0)) then
269	DO l=1,nlayer
270	DO ig=1,ngrid
271	qco2=pq(ig,l,ico2)+pdq(ig,l,ico2)*ptimestep
272	c Mean air molecular mass = 1/(q(ico2)/m_co2 + (1-q(ico2))/m_noco2)
273	mmean=1/(A*qco2 +B)
274	vmr_co2(ig,l) = qco2*mmean/m_co2
275	ENDDO
276	ENDDO
277	else
278	DO l=1,nlayer
279	DO ig=1,ngrid
280	vmr_co2(ig,l)=0.95
281	ENDDO
282	ENDDO
283	end if
284
285	c forecast of atmospheric temperature zt and frost temperature ztcond
286	c --------------------------------------------------------------------
287
288	DO l=1,nlayer
289	DO ig=1,ngrid
290	zt(ig,l)=pt(ig,l)+ pdt(ig,l)*ptimestep
291	! ztcond(ig,l)=1./(bcond-acondlog(.0095pplay(ig,l)))
292	ztcond(ig,l)=
293	& 1./(bcond-acondlog(.01vmr_co2(ig,l)*pplay(ig,l)))
294	if (pplay(ig,l).lt.1e-4) ztcond(ig,l)=0.0 !mars Monica
295	ENDDO
296	ENDDO
297
298	ztcond(:,nlayer+1)=ztcond(:,nlayer)
299
300	c Condensation/sublimation in the atmosphere
301	c ------------------------------------------
302	c (calcul of zcondicea , zfallice and pdtc)
303	c
304	DO l=nlayer , 1, -1
305	DO ig=1,ngrid
306	pdtc(ig,l)=0.
307	IF((zt(ig,l).LT.ztcond(ig,l)).or.(zfallice(ig,l+1).gt.0))THEN
308	condsub(ig)=.true.
309	IF (zfallice(ig,l+1).gt.0) then
310	zfallheat=zfallice(ig,l+1)*
311	& (pphi(ig,l+1)-pphi(ig,l) +
312	& cpice*(ztcond(ig,l+1)-ztcond(ig,l)))/latcond
313	ELSE
314	zfallheat=0.
315	ENDIF
316	pdtc(ig,l)=(ztcond(ig,l) - zt(ig,l))/ptimestep
317	zcondicea(ig,l)=(pplev(ig,l)-pplev(ig,l+1))
318	& ccondpdtc(ig,l)- zfallheat
319	c Case when the ice from above sublimes entirely
320	c """""""""""""""""""""""""""""""""""""""""""""""
321	IF (zfallice(ig,l+1).lt.- zcondicea(ig,l)) then
322	pdtc(ig,l)=(-zfallice(ig,l+1)+zfallheat)/
323	& (ccond*(pplev(ig,l)-pplev(ig,l+1)))
324	zcondicea(ig,l)= -zfallice(ig,l+1)
325	END IF
326
327	zfallice(ig,l) = zcondicea(ig,l)+zfallice(ig,l+1)
328	END IF
329	ENDDO
330	ENDDO
331
332	c *************************
333	c SURFACE CONDENSATION
334	c *************************
335
336	c forecast of ground temperature ztsrf and frost temperature ztcondsol
337	c --------------------------------------------------------------------
338	DO ig=1,ngrid
339	ztcondsol(ig)=
340	& 1./(bcond-acondlog(.01vmr_co2(ig,1)*pplev(ig,1)))
341	ztsrf(ig) = ptsrf(ig) + pdtsrf(ig)*ptimestep
342	ENDDO
343
344	c
345	c Condensation/sublimation on the ground
346	c --------------------------------------
347	c (compute zcondices and pdtsrfc)
348	c
349	DO ig=1,ngrid
350	IF(lati(ig).lt.0) THEN
351	! Southern hemisphere
352	icap=2
353	ELSE
354	! Northern hemisphere
355	icap=1
356	ENDIF
357
358	c
359	c Loop on where we have condensation/ sublimation
360	IF ((ztsrf(ig) .LT. ztcondsol(ig)) .OR. ! ground cond
361	$ (zfallice(ig,1).NE.0.) .OR. ! falling snow
362	$ ((ztsrf(ig) .GT. ztcondsol(ig)) .AND. ! ground sublim.
363	$ ((piceco2(ig)+zfallice(ig,1)*ptimestep) .NE. 0.))) THEN
364	condsub(ig) = .true.
365
366	IF (zfallice(ig,1).gt.0) then
367	zfallheat=zfallice(ig,1)*
368	& (pphi(ig,1)- phisfi(ig) +
369	& cpice*(ztcond(ig,1)-ztcondsol(ig)))/latcond
370	ELSE
371	zfallheat=0.
372	ENDIF
373
374	c condensation or partial sublimation of CO2 ice
375	c """""""""""""""""""""""""""""""""""""""""""""""
376	zcondices(ig)=pcapcal(ig)*(ztcondsol(ig)-ztsrf(ig))
377	& /(latcond*ptimestep) - zfallheat
378	pdtsrfc(ig) = (ztcondsol(ig) - ztsrf(ig))/ptimestep
379
380	c If the entire CO_2 ice layer sublimes
381	c """"""""""""""""""""""""""""""""""""""""""""""""""""
382	c (including what has just condensed in the atmosphere)
383
384	IF((piceco2(ig)/ptimestep+zfallice(ig,1)).LE.
385	& -zcondices(ig))THEN
386	zcondices(ig) = -piceco2(ig)/ptimestep - zfallice(ig,1)
387	pdtsrfc(ig)=(latcond/pcapcal(ig))*
388	& (zcondices(ig)+zfallheat)
389	END IF
390
391	c Changing CO2 ice amount and pressure :
392	c """"""""""""""""""""""""""""""""""""
393
394	zdiceco2(ig) = zcondices(ig) + zfallice(ig,1)
395	piceco2(ig) = piceco2(ig) + zdiceco2(ig)*ptimestep
396	pdpsrf(ig) = -zdiceco2(ig)*g
397
398	IF(ABS(pdpsrf(ig)*ptimestep).GT.pplev(ig,1)) THEN
399	PRINT*,'STOP in condens'
400	PRINT*,'condensing more than total mass'
401	PRINT*,'Grid point ',ig
402	PRINT*,'Ps = ',pplev(ig,1)
403	PRINT*,'d Ps = ',pdpsrf(ig)
404	STOP
405	ENDIF
406	END IF ! if there is condensation/sublimmation
407	ENDDO ! of DO ig=1,ngrid
408
409	c ********************************************************************
410	c Surface albedo and emissivity of the surface below the snow (emisref)
411	c ********************************************************************
412	c Prepare the case where albedo varies with insolation:
413	c ----------------------------------------------------
414	! if (fluxdependent) then
415	!
416	c Calcul du flux moyen (zonal mean)
417	! do j=1,jjp1
418	! Fluxmean(j)=0
419	! do i=1,iim
420	! ig=1+(j-2)*iim +i
421	! if(j.eq.1) ig=1
422	! if(j.eq.jjp1) ig=ngrid
423	! Fluxmean(j)=Fluxmean(j)+fluxsurf_sw(ig,1)
424	! $ +fluxsurf_sw(ig,2)
425	! enddo
426	! Fluxmean(j)=Fluxmean(j)/float(iim)
427	! enddo
428	!
429	c const A and B used to calculate the albedo which depends on solar flux
430	c albedice=constA+constB*Flux
431	c constT = time step to calculate the solar flux when flux decreases
432	! constA=0.26
433	c constA=0.33
434	c constA=0.186
435	! constB=0.00187
436	! constT=10
437	! endif ! of if (fluxdependent)
438
439	! Check that amont of CO2 ice is not problematic
440	DO ig=1,ngrid
441	if(.not.piceco2(ig).ge.0.) THEN
442	if(piceco2(ig).le.-5.e-8) print*,
443	$ 'WARNING newcondens piceco2(',ig,')=', piceco2(ig)
444	piceco2(ig)=0.
445	endif
446	ENDDO
447
448	! Set albedo and emissivity of the surface
449	! ----------------------------------------
450	CALL albedocaps(zls,ngrid,piceco2,psolaralb,emisref)
451
452	c Calcul de l'albedo
453	c ------------------
454	! do ig =1,ngrid
455	! IF(ig.GT.ngrid/2+1) THEN
456	! icap=2
457	! ELSE
458	! icap=1
459	! ENDIF
460	! IF(firstcall2) THEN
461	! albediceF(ig)=albedice(icap)
462	! ENDIF
463	c if there is still co2ice ccccccccccccccccccccccc
464	! if (piceco2(ig).gt.0) then
465	! emisref(ig) = emisice(icap)
466
467	c if flux dependent albedo is used
468	c --------------------------------
469	! if (fluxdependent) then
470	! j=INT((ig-2)/iim)+2
471	! if(ig.eq.1) j=1
472	! if(ig.eq.ngrid) j=jjp1
473	c albediceF_new(ig)=MIN(constA+constB*Fluxmean(j),
474	c $ constA+constB*250)
475	! albediceF_new(ig)=constA+constB*Fluxmean(j)
476	! if (albediceF(ig).gt.albediceF_new(ig)) then
477	! albediceF(ig)=albediceF(ig)+ ptimestep/(daysec*
478	! $ constT)*(albediceF_new(ig)-albediceF(ig))
479	! else
480	! albediceF(ig)=albediceF_new(ig)
481	! endif
482	c if part of the ice is transparent
483	c slopy = pente de la droite: alpha = y*co2ice/1620
484	c pour une valeur superieur a une epaisseur de glace donnee
485	c ici, epaisseur limite = 10cm
486	! if (transparency) then
487	! slopy=1/(1620*0.10)
488	! alpha=MIN(slopy*piceco2(ig),1.)
489	! psolaralb(ig,1) = alpha*albediceF(ig)
490	! $ +(1-alpha)*albedodat(ig)
491	! psolaralb(ig,2) = psolaralb(ig,1)
492	! else
493	! psolaralb(ig,1) = albediceF(ig)
494	! psolaralb(ig,2) = psolaralb(ig,1)
495	! endif
496	! else
497	c transparency set to true and fluxdependent set to false
498	! if (transparency) then
499	! slopy=1/(1620*0.10)
500	! alpha=MIN(slopy*piceco2(ig),1.)
501	! psolaralb(ig,1) = alpha*albedice(icap)
502	! $ +(1-alpha)*albedodat(ig)
503	! psolaralb(ig,2) = psolaralb(ig,1)
504	! else
505	c simplest case: transparency and flux dependent set to false
506	! psolaralb(ig,1) = albedice(icap)
507	! psolaralb(ig,2) = albedice(icap)
508	! endif
509	! endif
510	c no more co2ice, albedo = ground albedo
511	! else
512	! psolaralb(ig,1) = albedodat(ig)
513	! psolaralb(ig,2) = albedodat(ig)
514	! emisref(ig) = emissiv
515	! pemisurf(ig) = emissiv
516	! endif
517	! end do ! end of the ig loop
518
519	! set pemisurf() to emissiv when there is bare surface (needed for co2snow)
520	DO ig=1,ngrid
521	if (piceco2(ig).eq.0) then
522	pemisurf(ig)=emissiv
523	endif
524	ENDDO
525
526	! firstcall2=.false.
527	c ***************************************************************
528	c Correction to account for redistribution between sigma or hybrid
529	c layers when changing surface pressure (and warming/cooling
530	c of the CO2 currently changing phase).
531	c *************************************************************
532
533	DO ig=1,ngrid
534	if (condsub(ig)) then
535	do l=1,nlayer
536	ztc(l) =zt(ig,l) +pdtc(ig,l) *ptimestep
537	zu(l) =pu(ig,l) +pdu( ig,l) *ptimestep
538	zv(l) =pv(ig,l) +pdv( ig,l) *ptimestep
539	do iq=1,nq
540	zq(l,iq)=pq(ig,l,iq)+pdq(ig,l,iq)*ptimestep
541	enddo
542	end do
543
544	c Mass fluxes through the sigma levels (kg.m-2.s-1) (>0 when up)
545	c """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
546
547	zmflux(1) = -zcondices(ig)
548	DO l=1,nlayer
549	zmflux(l+1) = zmflux(l) -zcondicea(ig,l)
550	& + (bp(l)-bp(l+1))*(zfallice(ig,1)-zmflux(1))
551	c zmflux set to 0 if very low to avoid: top layer is disappearing in v1ld
552	if (abs(zmflux(l+1)).lt.1E-13.OR.bp(l+1).eq.0.) zmflux(l+1)=0.
553	END DO
554
555	c Mass of each layer
556	c ------------------
557	DO l=1,nlayer
558	masse(l)=(pplev(ig,l) - pplev(ig,l+1))/g
559	END DO
560
561
562	c Corresponding fluxes for T,U,V,Q
563	c """"""""""""""""""""""""""""""""
564
565	c averaging operator for TRANSPORT
566	c """"""""""""""""""""""""""""""""
567	c Value transfert at the surface interface when condensation
568	c sublimation:
569	ztm(1) = ztsrf(ig) + pdtsrfc(ig)*ptimestep
570	zum(1) = 0
571	zvm(1) = 0
572	do iq=1,nq
573	zqm(1,iq)=0. ! most tracer do not condense !
574	enddo
575	c Special case if one of the tracer is CO2 gas
576	if (ico2.ne.0) zqm(1,ico2)=1. ! flux is 100% CO2
577
578	c Van Leer scheme:
579	DO l=1,nlayer+1
580	w(l)=-zmflux(l)*ptimestep
581	END DO
582	call vl1d(ztc,2.,masse,w,ztm)
583	call vl1d(zu ,2.,masse,w,zum)
584	call vl1d(zv ,2.,masse,w,zvm)
585	do iq=1,nq
586	do l=1,nlayer
587	zq1(l)=zq(l,iq)
588	enddo
589	zqm1(1)=zqm(1,iq)
590	call vl1d(zq1,2.,masse,w,zqm1)
591	do l=2,nlayer
592	zq( l,iq)=zq1(l)
593	zqm(l,iq)=zqm1(l)
594	enddo
595	enddo
596
597	c Surface condensation affects low winds
598	if (zmflux(1).lt.0) then
599	zum(1)= zu(1) * (w(1)/masse(1))
600	zvm(1)= zv(1) * (w(1)/masse(1))
601	if (w(1).gt.masse(1)) then ! ensure numerical stability
602	zum(1)= (zu(1)-zum(2))*masse(1)/w(1) + zum(2)
603	zvm(1)= (zv(1)-zvm(2))*masse(1)/w(1) + zvm(2)
604	end if
605	end if
606
607	ztm(nlayer+1)= ztc(nlayer) ! should not be used, but...
608	zum(nlayer+1)= zu(nlayer) ! should not be used, but...
609	zvm(nlayer+1)= zv(nlayer) ! should not be used, but...
610	do iq=1,nq
611	zqm(nlayer+1,iq)= zq(nlayer,iq)
612	enddo
613
614	#ifdef MESOSCALE
615	!!!! AS: This part must be commented in the mesoscale model
616	!!!! AS: ... to avoid instabilities.
617	!!!! AS: you have to compile with -DMESOSCALE to do so
618	#else
619	c Tendencies on T, U, V, Q
620	c """"""""""""""""""""""""
621	DO l=1,nlayer
622
623	c Tendencies on T
624	zdtsig(ig,l) = (1/masse(l)) *
625	& ( zmflux(l)*(ztm(l) - ztc(l))
626	& - zmflux(l+1)*(ztm(l+1) - ztc(l))
627	& + zcondicea(ig,l)*(ztcond(ig,l)-ztc(l)) )
628	pdtc(ig,l) = pdtc(ig,l) + zdtsig(ig,l)
629
630	c Tendencies on U
631	pduc(ig,l) = (1/masse(l)) *
632	& ( zmflux(l)*(zum(l) - zu(l))
633	& - zmflux(l+1)*(zum(l+1) - zu(l)) )
634
635
636	c Tendencies on V
637	pdvc(ig,l) = (1/masse(l)) *
638	& ( zmflux(l)*(zvm(l) - zv(l))
639	& - zmflux(l+1)*(zvm(l+1) - zv(l)) )
640
641	END DO
642
643	#endif
644
645	c Tendencies on Q
646	do iq=1,nq
647	! if (noms(iq).eq.'co2') then
648	if (iq.eq.ico2) then
649	c SPECIAL Case when the tracer IS CO2 :
650	DO l=1,nlayer
651	pdqc(ig,l,iq)= (1/masse(l)) *
652	& ( zmflux(l)*(zqm(l,iq) - zq(l,iq))
653	& - zmflux(l+1)*(zqm(l+1,iq) - zq(l,iq))
654	& + zcondicea(ig,l)*(zq(l,iq)-1.) )
655	END DO
656	else
657	DO l=1,nlayer
658	pdqc(ig,l,iq)= (1/masse(l)) *
659	& ( zmflux(l)*(zqm(l,iq) - zq(l,iq))
660	& - zmflux(l+1)*(zqm(l+1,iq) - zq(l,iq))
661	& + zcondicea(ig,l)*zq(l,iq) )
662	END DO
663	end if
664	enddo
665
666	c --------------------------------------------------------
667	c Roughly Simulate Molecular mixing when CO2 is too depleted by
668	c Surface condensation (mixing starts if qco2 < qco2min )
669	c FF 06/2004
670	c WARNING : this is now done in convadj, better (FF 02/2005)
671	c --------------------------------------------------------
672	flag=0 ! now done in convadj : must be =0
673	if (flag.eq.1) then
674	if(ico2.gt.0) then ! relevant only if one tracer is CO2
675	if(pq(ig,1,ico2)+(pdq(ig,1,ico2)+pdqc(ig,1,ico2))*ptimestep
676	& .lt.qco2min) then
677	do iq=1,nq
678	zq(1,iq)=pq(ig,1,iq)
679	& +(pdq(ig,1,iq)+pdqc(ig,1,iq))*ptimestep
680	Smq(1,iq) = masse(1)*zq(1,iq)
681	end do
682	Sm(1) = masse(1)
683	do l =2,nlayer
684	do iq=1,nq
685	zq(l,iq)=pq(ig,l,iq)
686	& +(pdq(ig,l,iq)+pdqc(ig,l,iq))*ptimestep
687	smq(l,iq) = smq(l-1,iq) + masse(l)*zq(l,iq)
688	end do
689	sm(l) = sm(l-1) + masse(l)
690	if(zq(l,ico2).gt.qco2min) then
691	c mixmas: mass of atmosphere that must be mixed to reach qco2min
692	mixmas = (sm(l-1)*zq(l,ico2)-Smq(l-1,ico2))
693	& /(zq(l,ico2)-qco2min)
694	if((mixmas.le.sm(l)))then
695	c OK if mixed mass less than mass of layers affected
696	nmix=l ! number of layer affected by mixing
697	goto 99
698	end if
699	end if
700	end do
701	99 continue
702	do iq=1,nq
703	qmix=zq(nmix,iq)
704	& +(Smq(nmix-1,iq)-zq(nmix,iq)*Sm(nmix-1))/mixmas
705	do l=1,nmix-1
706	pdqc(ig,l,iq)=
707	& (qmix-pq(ig,l,iq))/ptimestep - pdq(ig,l,iq)
708	end do
709	c layer only partly mixed :
710	pdqc(ig,nmix,iq)=(
711	& qmix+(Sm(nmix)-mixmas)*(zq(nmix,iq)-qmix)/masse(nmix)
712	& -pq(ig,nmix,iq))/ptimestep -pdq(ig,nmix,iq)
713
714	end do
715	end if
716	end if
717
718	endif ! (flag.eq.1)
719	end if ! if (condsub)
720	END DO ! loop on ig
721
722	c ***************************************************************
723	c CO2 snow / clouds scheme
724	c ***************************************************************
725
726	call co2snow(ngrid,nlayer,ptimestep,emisref,condsub,pplev,
727	& zcondicea,zcondices,zfallice,pemisurf)
728
729	c ***************************************************************
730	c Ecriture des diagnostiques
731	c ***************************************************************
732
733	c DO l=1,nlayer
734	c DO ig=1,ngrid
735	c Taux de cond en kg.m-2.pa-1.s-1
736	c tconda1(ig,l)=zcondicea(ig,l)/(pplev(ig,l)-pplev(ig,l+1))
737	c Taux de cond en kg.m-3.s-1
738	c tconda2(ig,l)=tconda1(ig,l)pplay(ig,l)g/(r*pt(ig,l))
739	c END DO
740	c END DO
741	c call WRITEDIAGFI(ngrid,'tconda1',
742	c &'Taux de condensation CO2 atmospherique /Pa',
743	c & 'kg.m-2.Pa-1.s-1',3,tconda1)
744	c call WRITEDIAGFI(ngrid,'tconda2',
745	c &'Taux de condensation CO2 atmospherique /m',
746	c & 'kg.m-3.s-1',3,tconda2)
747
748	! output falling co2 ice in 1st layer:
749	! call WRITEDIAGFI(ngrid,'fallice',
750	! &'Precipitation of co2 ice',
751	! & 'kg.m-2.s-1',2,zfallice(1,1))
752
753	!! Specific stuff to bound co2 tracer values ....
754	if (bound_qco2.and.(ico2.ne.0)) then
755	do ig=1,ngrid
756	do l=1,nlayer
757	zqco2=pq(ig,l,ico2)
758	& +(pdq(ig,l,ico2)+pdqc(ig,l,ico2))*ptimestep
759	if (zqco2.gt.qco2max) then
760	! correct pdqc:
761	pdqc(ig,l,ico2)=((qco2max-pq(ig,l,ico2))/ptimestep)
762	& -pdq(ig,l,ico2)
763	write(,) "newcondens: adapting pdqc(ig,l,ico2)",
764	& " so that co2 conc. does not exceed",qco2max
765	write(,) " ig:",ig," l:",l
766	endif ! of if (zqco2.gt.qco2max)
767	if (zqco2.lt.qco2mini) then
768	! correct pdqc:
769	pdqc(ig,l,ico2)=((qco2mini-pq(ig,l,ico2))/ptimestep)
770	& -pdq(ig,l,ico2)
771	write(,) "newcondens: adapting pdqc(ig,l,ico2)",
772	& " so that co2 conc. is not less than",qco2mini
773	write(,) " ig:",ig," l:",l
774	endif ! of if (zqco2.lt.qco2mini)
775	end do
776	enddo
777	endif ! of if (bound_qco2.and.(ico2.ne.0)) then
778
779	#ifndef MESOSCALE
780	! Extra special case for surface temperature tendency pdtsrfc:
781	! we want to fix the south pole temperature to CO2 condensation temperature
782	if (caps.and.(obliquit.lt.27.)) then
783	! check if last grid point is the south pole
784	if (abs(lati(ngrid)-(-pi/2.)).lt.1.e-5) then
785	! NB: Updated surface pressure, at grid point 'ngrid', is
786	! ps(ngrid)=pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep
787	! write(,) "newcondens: South pole: lati(ngrid)=",
788	! & lati(ngrid)
789	ztcondsol(ngrid)=
790	& 1./(bcond-acondlog(.01vmr_co2(ngrid,1)*
791	& (pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep)))
792	pdtsrfc(ngrid)=(ztcondsol(ngrid)-ztsrf(ngrid))/ptimestep
793	endif
794	endif
795	#endif
796
797	return
798	end
799
800
801
802	c *****************************************************************
803	SUBROUTINE vl1d(q,pente_max,masse,w,qm)
804	c
805	c
806	c Operateur de moyenne inter-couche pour calcul de transport type
807	c Van-Leer " pseudo amont " dans la verticale
808	c q,w sont des arguments d'entree pour le s-pg ....
809	c masse : masse de la couche Dp/g
810	c w : masse d'atm ``transferee'' a chaque pas de temps (kg.m-2)
811	c pente_max = 2 conseillee
812	c
813	c
814	c --------------------------------------------------------------------
815	IMPLICIT NONE
816
817	#include "dimensions.h"
818
819	c
820	c
821	c
822	c Arguments:
823	c ----------
824	real masse(llm),pente_max
825	REAL q(llm),qm(llm+1)
826	REAL w(llm+1)
827	c
828	c Local
829	c ---------
830	c
831	INTEGER l
832	c
833	real dzq(llm),dzqw(llm),adzqw(llm),dzqmax
834	real sigw, Mtot, MQtot
835	integer m
836	c integer ismax,ismin
837
838
839	c On oriente tout dans le sens de la pression
840	c W > 0 WHEN DOWN !!!!!!!!!!!!!
841
842	do l=2,llm
843	dzqw(l)=q(l-1)-q(l)
844	adzqw(l)=abs(dzqw(l))
845	enddo
846
847	do l=2,llm-1
848	if(dzqw(l)*dzqw(l+1).gt.0.) then
849	dzq(l)=0.5*(dzqw(l)+dzqw(l+1))
850	else
851	dzq(l)=0.
852	endif
853	dzqmax=pente_max*min(adzqw(l),adzqw(l+1))
854	dzq(l)=sign(min(abs(dzq(l)),dzqmax),dzq(l))
855	enddo
856
857	dzq(1)=0.
858	dzq(llm)=0.
859
860	do l = 1,llm-1
861
862	c Regular scheme (transfered mass < layer mass)
863	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
864	if(w(l+1).gt.0. .and. w(l+1).le.masse(l+1)) then
865	sigw=w(l+1)/masse(l+1)
866	qm(l+1)=(q(l+1)+0.5(1.-sigw)dzq(l+1))
867	else if(w(l+1).le.0. .and. -w(l+1).le.masse(l)) then
868	sigw=w(l+1)/masse(l)
869	qm(l+1)=(q(l)-0.5(1.+sigw)dzq(l))
870
871	c Extended scheme (transfered mass > layer mass)
872	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
873	else if(w(l+1).gt.0.) then
874	m=l+1
875	Mtot = masse(m)
876	MQtot = masse(m)*q(m)
877	do while ((m.lt.llm).and.(w(l+1).gt.(Mtot+masse(m+1))))
878	m=m+1
879	Mtot = Mtot + masse(m)
880	MQtot = MQtot + masse(m)*q(m)
881	end do
882	if (m.lt.llm) then
883	sigw=(w(l+1)-Mtot)/masse(m+1)
884	qm(l+1)= (1/w(l+1))(MQtot + (w(l+1)-Mtot)
885	& (q(m+1)+0.5(1.-sigw)dzq(m+1)) )
886	else
887	w(l+1) = Mtot
888	qm(l+1) = Mqtot / Mtot
889	write(,) 'top layer is disapearing !'
890	stop
891	end if
892	else ! if(w(l+1).lt.0)
893	m = l-1
894	Mtot = masse(m+1)
895	MQtot = masse(m+1)*q(m+1)
896	if (m.gt.0) then ! because some compilers will have problems
897	! evaluating masse(0)
898	do while ((m.gt.0).and.(-w(l+1).gt.(Mtot+masse(m))))
899	m=m-1
900	Mtot = Mtot + masse(m+1)
901	MQtot = MQtot + masse(m+1)*q(m+1)
902	if (m.eq.0) exit
903	end do
904	endif
905	if (m.gt.0) then
906	sigw=(w(l+1)+Mtot)/masse(m)
907	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)
908	& (q(m)-0.5(1.+sigw)dzq(m)) )
909	else
910	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)qm(1))
911	end if
912	end if
913	enddo
914
915	c boundary conditions (not used in newcondens !!)
916	c qm(llm+1)=0.
917	c if(w(1).gt.0.) then
918	c qm(1)=q(1)
919	c else
920	c qm(1)=0.
921	c end if
922
923	return
924	end

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