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co2condens_mod.F @ 2443

Last change on this file since 2443 was 2409, checked in by emillour, 5 years ago
Mars GCM: Code tidying : make a "dust_param_mod" module to store dust cycle relevant flags and variables (and remove them from callkeys.h) EM
File size: 36.4 KB

Rev	Line
[2009]	1	MODULE co2condens_mod
	2
	3	IMPLICIT NONE
	4
[2184]	5	logical, save :: scavco2cond = .false. ! flag for using scavenging_by_co2
	6
[2009]	7	CONTAINS
	8
	9	SUBROUTINE co2condens(ngrid,nlayer,nq,ptimestep,
[38]	10	$ pcapcal,pplay,pplev,ptsrf,pt,
	11	$ pphi,pdt,pdu,pdv,pdtsrf,pu,pv,pq,pdq,
[2184]	12	$ piceco2,psolaralb,pemisurf,rdust,
[38]	13	$ pdtc,pdtsrfc,pdpsrf,pduc,pdvc,pdqc,
[1996]	14	$ fluxsurf_sw,zls,
	15	$ zdqssed_co2,pcondicea_co2microp,
[2184]	16	$ zdtcloudco2,pdqsc)
[38]	17
[2332]	18	use tracer_mod, only: noms, igcm_h2o_ice, igcm_h2o_vap,
[2184]	19	& igcm_dust_mass, igcm_dust_number,
[2322]	20	& igcm_ccn_mass, igcm_ccn_number,
[2332]	21	& igcm_hdo_ice, igcm_hdo_vap,
	22	& nqperes,nqfils, ! MVals: variables isotopes
[2322]	23	& qperemin,masseqmin
[1047]	24	use surfdat_h, only: emissiv, phisfi
[2124]	25	use geometry_mod, only: latitude, ! grid point latitudes (rad)
	26	& longitude_deg, latitude_deg
[2009]	27	use planete_h, only: obliquit
	28	use comcstfi_h, only: cpp, g, r, pi
[2409]	29	use dust_param_mod, only: freedust
	30
[1432]	31	#ifndef MESOSCALE
[2124]	32	USE vertical_layers_mod, ONLY: ap, bp
[1432]	33	#endif
[38]	34	IMPLICIT NONE
	35	c=======================================================================
	36	c subject:
	37	c --------
	38	c Condensation/sublimation of CO2 ice on the ground and in the
	39	c atmosphere
	40	c (Scheme described in Forget et al., Icarus, 1998)
	41	c
[2009]	42	c author: Francois Forget 1994-1996 ; updated 1996 -- 2018
[38]	43	c ------
[1996]	44	c adapted to external CO2 ice clouds scheme by Deborah Bardet (2018) '
[38]	45	c
	46	c=======================================================================
	47	c
	48	c 0. Declarations :
	49	c ------------------
	50	c
[1528]	51	include "callkeys.h"
[38]	52
	53	c-----------------------------------------------------------------------
	54	c Arguments :
	55	c ---------
[890]	56	INTEGER,INTENT(IN) :: ngrid ! number of atmospheric columns
	57	INTEGER,INTENT(IN) :: nlayer ! number of vertical layers
	58	INTEGER,INTENT(IN) :: nq ! number of tracers
[38]	59
[890]	60	REAL,INTENT(IN) :: ptimestep ! physics timestep (s)
	61	REAL,INTENT(IN) :: pcapcal(ngrid)
	62	REAL,INTENT(IN) :: pplay(ngrid,nlayer) !mid-layer pressure (Pa)
	63	REAL,INTENT(IN) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
	64	REAL,INTENT(IN) :: ptsrf(ngrid) ! surface temperature (K)
	65	REAL,INTENT(IN) :: pt(ngrid,nlayer) ! atmospheric temperature (K)
	66	REAL,INTENT(IN) :: pphi(ngrid,nlayer) ! geopotential (m2.s-2)
	67	REAL,INTENT(IN) :: pdt(ngrid,nlayer) ! tendency on temperature from
	68	! previous physical processes (K/s)
	69	REAL,INTENT(IN) :: pdu(ngrid,nlayer) ! tendency on zonal wind (m/s2)
	70	! from previous physical processes
	71	REAL,INTENT(IN) :: pdv(ngrid,nlayer) ! tendency on meridional wind (m/s2)
	72	! from previous physical processes
	73	REAL,INTENT(IN) :: pdtsrf(ngrid) ! tendency on surface temperature from
	74	! previous physical processes (K/s)
	75	REAL,INTENT(IN) :: pu(ngrid,nlayer) ! zonal wind (m/s)
	76	REAL,INTENT(IN) :: pv(ngrid,nlayer) ! meridional wind (m/s)
	77	REAL,INTENT(IN) :: pq(ngrid,nlayer,nq) ! tracers (../kg_air)
	78	REAL,INTENT(IN) :: pdq(ngrid,nlayer,nq) ! tendency on tracers from
	79	! previous physical processes
[1996]	80
	81	REAL,INTENT(IN) :: zdqssed_co2(ngrid) ! CO2 flux at the surface (kg.m-2.s-1)
	82	REAL,INTENT(IN) :: pcondicea_co2microp(ngrid,nlayer)! tendency due to CO2 condensation (kg/kg.s-1)
	83	REAL,INTENT(IN) :: zdtcloudco2(ngrid,nlayer) ! tendency on temperature due to latent heat
	84
[890]	85	REAL,INTENT(INOUT) :: piceco2(ngrid) ! CO2 ice on the surface (kg.m-2)
	86	REAL,INTENT(INOUT) :: psolaralb(ngrid,2) ! albedo of the surface
	87	REAL,INTENT(INOUT) :: pemisurf(ngrid) ! emissivity of the surface
[2184]	88	REAL,INTENT(IN) :: rdust(ngrid,nlayer) ! dust effective radius
[890]	89
	90	! tendencies due to CO2 condensation/sublimation:
	91	REAL,INTENT(OUT) :: pdtc(ngrid,nlayer) ! tendency on temperature (K/s)
	92	REAL,INTENT(OUT) :: pdtsrfc(ngrid) ! tendency on surface temperature (K/s)
	93	REAL,INTENT(OUT) :: pdpsrf(ngrid) ! tendency on surface pressure (Pa/s)
	94	REAL,INTENT(OUT) :: pduc(ngrid,nlayer) ! tendency on zonal wind (m.s-2)
	95	REAL,INTENT(OUT) :: pdvc(ngrid,nlayer) ! tendency on meridional wind (m.s-2)
	96	REAL,INTENT(OUT) :: pdqc(ngrid,nlayer,nq) ! tendency on tracers
[2184]	97	REAL,INTENT(OUT) :: pdqsc(ngrid,nq) ! tendency on surface tracers
[890]	98
	99	! added to calculate flux dependent albedo:
	100	REAL,intent(in) :: fluxsurf_sw(ngrid,2)
	101	real,intent(in) :: zls ! solar longitude (rad)
[38]	102
	103	c
	104	c Local variables :
	105	c -----------------
	106
	107	INTEGER i,j
[2009]	108	INTEGER l,ig,iq,icap
[890]	109	REAL zt(ngrid,nlayer)
[38]	110	REAL zcpi
[1114]	111	REAL ztcond (ngrid,nlayer+1) ! CO2 condensation temperature (atm)
	112	REAL ztcondsol(ngrid) ! CO2 condensation temperature (surface)
[890]	113	REAL zdiceco2(ngrid)
[2009]	114	REAL zcondicea(ngrid,nlayer) ! condensation rate in layer l (kg/m2/s)
	115	REAL zcondices(ngrid) ! condensation rate on the ground (kg/m2/s)
	116	REAL zfallice(ngrid,nlayer+1) ! amount of ice falling from layer l (kg/m2/s)
	117	REAL zfallheat
[890]	118	REAL zmflux(nlayer+1)
	119	REAL zu(nlayer),zv(nlayer)
[2184]	120	REAL zqc(nlayer,nq),zq1(nlayer)
[890]	121	REAL ztsrf(ngrid)
	122	REAL ztc(nlayer), ztm(nlayer+1)
	123	REAL zum(nlayer+1) , zvm(nlayer+1)
	124	REAL zqm(nlayer+1,nq),zqm1(nlayer+1)
	125	REAL masse(nlayer),w(nlayer+1)
	126	REAL Sm(nlayer),Smq(nlayer,nq),mixmas,qmix
[2124]	127	REAL availco2
[890]	128	LOGICAL condsub(ngrid)
[38]	129
[1224]	130	real :: emisref(ngrid)
[2184]	131
	132	REAL zdq_scav(ngrid,nlayer,nq) ! tendancy due to scavenging by co2
	133	REAL zq(ngrid,nlayer,nq)
[1224]	134
[38]	135	c variable speciale diagnostique
[890]	136	real tconda1(ngrid,nlayer)
	137	real tconda2(ngrid,nlayer)
	138	c REAL zdiceco2a(ngrid) ! for diagnostic only
	139	real zdtsig (ngrid,nlayer)
	140	real zdt (ngrid,nlayer)
	141	real vmr_co2(ngrid,nlayer) ! co2 volume mixing ratio
[38]	142	! improved_ztcond flag: If set to .true. (AND running with a 'co2' tracer)
	143	! then condensation temperature is computed using partial pressure of CO2
	144	logical,parameter :: improved_ztcond=.true.
	145
	146	c local saved variables
[890]	147	integer,save :: ico2 ! index of CO2 tracer
[2124]	148	real,save :: qco2,mmean
[890]	149	real,parameter :: latcond=5.9e5 ! (J/kg) Latent heat of solid CO2 ice
	150	real,parameter :: tcond1mb=136.27 ! condensation temperature (K) at 1 mbar
	151	real,parameter :: cpice=1000. ! (J.kg-1.K-1) specific heat of CO2 ice
	152	REAL,SAVE :: acond,bcond,ccond
	153	real,save :: m_co2, m_noco2, A , B
[38]	154
[890]	155	LOGICAL,SAVE :: firstcall = .true. !,firstcall2=.true.
[38]	156
[2124]	157	c D.BARDET: for debug
[1996]	158	real ztc3D(ngrid,nlayer)
	159	REAL ztm3D(ngrid,nlayer)
	160	REAL zmflux3D(ngrid,nlayer)
[2322]	161
	162	c MVals: variables isotopes
	163	REAL Ratio1(nlayer),Ratiom1(nlayer+1)
	164	REAL masseq(nlayer),wq(nlayer+1)
	165	INTEGER ifils,iq2
[38]	166	c----------------------------------------------------------------------
	167
	168	c Initialisation
	169	c --------------
	170	c
[1779]	171	! AS: firstcall OK absolute
[38]	172	IF (firstcall) THEN
[890]	173
[38]	174	bcond=1./tcond1mb
	175	ccond=cpp/(g*latcond)
	176	acond=r/latcond
	177
	178	firstcall=.false.
[2124]	179	write(,) 'CO2condens: improved_ztcond=',improved_ztcond
	180	PRINT*,'In co2condens:Tcond(P=1mb)=',tcond1mb,' Lcond=',latcond
[38]	181	PRINT*,'acond,bcond,ccond',acond,bcond,ccond
	182
	183	ico2=0
	184
	185	if (tracer) then
	186	c Prepare Special treatment if one of the tracer is CO2 gas
[1036]	187	do iq=1,nq
[38]	188	if (noms(iq).eq."co2") then
	189	ico2=iq
	190	m_co2 = 44.01E-3 ! CO2 molecular mass (kg/mol)
	191	m_noco2 = 33.37E-3 ! Non condensible mol mass (kg/mol)
	192	c Compute A and B coefficient use to compute
	193	c mean molecular mass Mair defined by
	194	c 1/Mair = q(ico2)/m_co2 + (1-q(ico2))/m_noco2
	195	c 1/Mair = A*q(ico2) + B
	196	A =(1/m_co2 - 1/m_noco2)
	197	B=1/m_noco2
	198	endif
	199	enddo
	200	end if
[890]	201	ENDIF ! of IF (firstcall)
[38]	202	zcpi=1./cpp
[1130]	203
[38]	204	c
	205	c======================================================================
	206	c Calcul of CO2 condensation sublimation
	207	c ============================================================
	208	c
	209	c Used variable :
	210	c piceco2(ngrid) : amount of co2 ice on the ground (kg/m2)
	211	c zcondicea(ngrid,l): condensation rate in layer l (kg/m2/s)
	212	c zcondices(ngrid): condensation rate on the ground (kg/m2/s)
	213	c zfallice(ngrid,l):amount of ice falling from layer l (kg/m2/s)
	214	c
[1047]	215	c pdtc(ngrid,nlayer) : dT/dt due to cond/sub
[38]	216	c
	217	c
[2184]	218	c Tendencies set to 0
[38]	219	c -------------------------------------
[2189]	220	zcondicea(1:ngrid,1:nlayer) = 0.
	221	zfallice(1:ngrid,1:nlayer+1) = 0.
	222	pduc(1:ngrid,1:nlayer) = 0
	223	pdvc(1:ngrid,1:nlayer) = 0
	224	pdtc(1:ngrid,1:nlayer) = 0.
	225	pdqsc(1:ngrid,1:nq) = 0
[38]	226
[2189]	227	pdqc(1:ngrid,1:nlayer,1:nq) = 0
[38]	228
[2189]	229	zcondices(1:ngrid) = 0.
	230	pdtsrfc(1:ngrid) = 0.
	231	pdpsrf(1:ngrid) = 0.
	232	condsub(1:ngrid) = .false.
	233	zdiceco2(1:ngrid) = 0.
	234
[38]	235	zfallheat=0
[2184]	236
	237	zdq_scav(:,:,:)=0.
[38]	238
[2184]	239	c Update tendencies from previous processes
	240	c -------------------------------------
	241	DO l=1,nlayer
	242	DO ig=1,ngrid
	243	zt(ig,l)=pt(ig,l)+ pdt(ig,l)*ptimestep
	244	do iq=1,nq
	245	zq(ig,l,iq)=pq(ig,l,iq)+pdq(ig,l,iq)*ptimestep
	246	enddo
	247	ENDDO
	248	ENDDO
	249
[38]	250	c *************************
	251	c ATMOSPHERIC CONDENSATION
	252	c *************************
	253
	254	c Compute CO2 Volume mixing ratio
	255	c -------------------------------
	256	if (improved_ztcond.and.(ico2.ne.0)) then
	257	DO l=1,nlayer
	258	DO ig=1,ngrid
	259	qco2=pq(ig,l,ico2)+pdq(ig,l,ico2)*ptimestep
	260	c Mean air molecular mass = 1/(q(ico2)/m_co2 + (1-q(ico2))/m_noco2)
	261	mmean=1/(A*qco2 +B)
	262	vmr_co2(ig,l) = qco2*mmean/m_co2
	263	ENDDO
	264	ENDDO
	265	else
	266	DO l=1,nlayer
	267	DO ig=1,ngrid
	268	vmr_co2(ig,l)=0.95
	269	ENDDO
	270	ENDDO
[2184]	271	endif
[38]	272
[1996]	273	IF (.NOT. co2clouds) then
[38]	274	c forecast of atmospheric temperature zt and frost temperature ztcond
	275	c --------------------------------------------------------------------
	276
	277	DO l=1,nlayer
	278	DO ig=1,ngrid
	279	! ztcond(ig,l)=1./(bcond-acondlog(.0095pplay(ig,l)))
[1263]	280	if (pplay(ig,l).ge.1e-4) then
	281	ztcond(ig,l)=
[38]	282	& 1./(bcond-acondlog(.01vmr_co2(ig,l)*pplay(ig,l)))
[1263]	283	else
	284	ztcond(ig,l)=0.0 !mars Monica
	285	endif
[38]	286	ENDDO
	287	ENDDO
[327]	288
[328]	289	ztcond(:,nlayer+1)=ztcond(:,nlayer)
[38]	290
	291	c Condensation/sublimation in the atmosphere
	292	c ------------------------------------------
	293	c (calcul of zcondicea , zfallice and pdtc)
	294	c
	295	DO l=nlayer , 1, -1
	296	DO ig=1,ngrid
	297	pdtc(ig,l)=0.
	298	IF((zt(ig,l).LT.ztcond(ig,l)).or.(zfallice(ig,l+1).gt.0))THEN
	299	condsub(ig)=.true.
	300	IF (zfallice(ig,l+1).gt.0) then
	301	zfallheat=zfallice(ig,l+1)*
	302	& (pphi(ig,l+1)-pphi(ig,l) +
	303	& cpice*(ztcond(ig,l+1)-ztcond(ig,l)))/latcond
	304	ELSE
	305	zfallheat=0.
	306	ENDIF
	307	pdtc(ig,l)=(ztcond(ig,l) - zt(ig,l))/ptimestep
	308	zcondicea(ig,l)=(pplev(ig,l)-pplev(ig,l+1))
	309	& ccondpdtc(ig,l)- zfallheat
	310	c Case when the ice from above sublimes entirely
	311	c """""""""""""""""""""""""""""""""""""""""""""""
	312	IF (zfallice(ig,l+1).lt.- zcondicea(ig,l)) then
	313	pdtc(ig,l)=(-zfallice(ig,l+1)+zfallheat)/
	314	& (ccond*(pplev(ig,l)-pplev(ig,l+1)))
	315	zcondicea(ig,l)= -zfallice(ig,l+1)
	316	END IF
	317
	318	zfallice(ig,l) = zcondicea(ig,l)+zfallice(ig,l+1)
	319	END IF
	320	ENDDO
	321	ENDDO
[1996]	322
[2184]	323	if (scavco2cond) then
	324	call scavenging_by_co2(ngrid,nlayer,nq,ptimestep,pplev,zq,
	325	& rdust,zcondicea,zfallice,zdq_scav,pdqsc)
	326	endif
	327
	328	ELSE ! if co2 clouds
[1996]	329	DO ig=1,ngrid
	330	zfallice(ig,1) = zdqssed_co2(ig)
	331	ENDDO
	332	DO l=nlayer , 1, -1
	333	DO ig=1,ngrid
	334	zcondicea(ig,l) = pcondicea_co2microp(ig,l)*
	335	& (pplev(ig,l) - pplev(ig,l+1))/g
	336	ENDDO
	337	ENDDO
[2184]	338
	339	ENDIF ! end of if co2clouds
[38]	340
[1996]	341	call WRITEdiagfi(ngrid,"pdtc_atm",
	342	& "temperature tendency due to CO2 condensation",
	343	& " ",3,pdtc)
	344
	345	call WRITEdiagfi(ngrid,"zcondicea",
	346	& "",
	347	& " ",3,zcondicea)
	348
	349	call WRITEdiagfi(ngrid,"zfallice",
	350	& "",
	351	& " ",2,zfallice(ngrid,1))
[2184]	352
[1996]	353
[38]	354	c *************************
	355	c SURFACE CONDENSATION
	356	c *************************
	357
	358	c forecast of ground temperature ztsrf and frost temperature ztcondsol
	359	c --------------------------------------------------------------------
	360	DO ig=1,ngrid
	361	ztcondsol(ig)=
	362	& 1./(bcond-acondlog(.01vmr_co2(ig,1)*pplev(ig,1)))
	363	ztsrf(ig) = ptsrf(ig) + pdtsrf(ig)*ptimestep
	364	ENDDO
	365
	366	c
	367	c Condensation/sublimation on the ground
	368	c --------------------------------------
[1114]	369	c (compute zcondices and pdtsrfc)
[38]	370	c
	371	DO ig=1,ngrid
[1541]	372	IF(latitude(ig).lt.0) THEN
[1114]	373	! Southern hemisphere
[38]	374	icap=2
	375	ELSE
[1114]	376	! Northern hemisphere
[38]	377	icap=1
	378	ENDIF
	379
	380	c
	381	c Loop on where we have condensation/ sublimation
	382	IF ((ztsrf(ig) .LT. ztcondsol(ig)) .OR. ! ground cond
	383	$ (zfallice(ig,1).NE.0.) .OR. ! falling snow
	384	$ ((ztsrf(ig) .GT. ztcondsol(ig)) .AND. ! ground sublim.
	385	$ ((piceco2(ig)+zfallice(ig,1)*ptimestep) .NE. 0.))) THEN
	386	condsub(ig) = .true.
	387
	388	IF (zfallice(ig,1).gt.0) then
	389	zfallheat=zfallice(ig,1)*
	390	& (pphi(ig,1)- phisfi(ig) +
[890]	391	& cpice*(ztcond(ig,1)-ztcondsol(ig)))/latcond
[38]	392	ELSE
	393	zfallheat=0.
	394	ENDIF
	395
	396	c condensation or partial sublimation of CO2 ice
	397	c """""""""""""""""""""""""""""""""""""""""""""""
	398	zcondices(ig)=pcapcal(ig)*(ztcondsol(ig)-ztsrf(ig))
	399	& /(latcond*ptimestep) - zfallheat
	400	pdtsrfc(ig) = (ztcondsol(ig) - ztsrf(ig))/ptimestep
[2124]	401	zdiceco2(ig) = zcondices(ig) + zfallice(ig,1)
	402
[2153]	403	#ifdef MESOSCALE
	404	print*, "not enough CO2 tracer in 1st layer to condense"
	405	print*, ">>> to be implemented in the mesoscale case"
	406	print*, "because this uses ap levels..."
	407	#else
[2124]	408	c If there is not enough CO2 tracer in 1st layer to condense
	409	c """"""""""""""""""""""""""""""""""""""""""""""""""""""
	410	IF(ico2.ne.0) then
	411	c Available CO2 tracer in layer 1 at end of timestep (kg/m2)
	412	availco2= pq(ig,1,ico2)*((ap(1)-ap(2))+
	413	& (bp(1)-bp(2))(pplev(ig,1)/g-zdiceco2(ig)ptimestep))
	414
	415	IF ((zcondices(ig) + zcondicea(ig,1))*ptimestep
	416	& .gt.availco2) then
	417	zcondices(ig) = availco2/ptimestep -zcondicea(ig,1)
	418	zdiceco2(ig) = zcondices(ig) + zfallice(ig,1)
	419	pdtsrfc(ig)=(latcond/pcapcal(ig))*
	420	& (zcondices(ig)+zfallheat)
	421	ENDIF
	422	ENDIF
[2153]	423	#endif
[2124]	424
[2184]	425	c If the entire CO2 ice layer sublimes
[38]	426	c """"""""""""""""""""""""""""""""""""""""""""""""""""
	427	c (including what has just condensed in the atmosphere)
	428
	429	IF((piceco2(ig)/ptimestep+zfallice(ig,1)).LE.
	430	& -zcondices(ig))THEN
	431	zcondices(ig) = -piceco2(ig)/ptimestep - zfallice(ig,1)
	432	pdtsrfc(ig)=(latcond/pcapcal(ig))*
	433	& (zcondices(ig)+zfallheat)
[2124]	434	zdiceco2(ig) = zcondices(ig) + zfallice(ig,1)
[38]	435	END IF
	436
	437	c Changing CO2 ice amount and pressure :
	438	c """"""""""""""""""""""""""""""""""""
	439
	440	piceco2(ig) = piceco2(ig) + zdiceco2(ig)*ptimestep
	441	pdpsrf(ig) = -zdiceco2(ig)*g
	442
	443	IF(ABS(pdpsrf(ig)*ptimestep).GT.pplev(ig,1)) THEN
	444	PRINT*,'STOP in condens'
	445	PRINT*,'condensing more than total mass'
	446	PRINT*,'Grid point ',ig
[2124]	447	PRINT*,'Longitude(degrees): ',longitude_deg(ig)
	448	PRINT*,'Latitude(degrees): ',latitude_deg(ig)
[38]	449	PRINT*,'Ps = ',pplev(ig,1)
	450	PRINT*,'d Ps = ',pdpsrf(ig)
[2399]	451	CALL abort_physic('co2condens',
	452	& 'condensing more than total mass', 1)
[38]	453	ENDIF
[2184]	454	END IF ! if there is condensation/sublimation
[38]	455	ENDDO ! of DO ig=1,ngrid
	456
	457	c ********************************************************************
	458	c Surface albedo and emissivity of the surface below the snow (emisref)
	459	c ********************************************************************
	460
	461	! Check that amont of CO2 ice is not problematic
	462	DO ig=1,ngrid
	463	if(.not.piceco2(ig).ge.0.) THEN
	464	if(piceco2(ig).le.-5.e-8) print*,
[2124]	465	$ 'WARNING co2condens piceco2(',ig,')=', piceco2(ig)
[38]	466	piceco2(ig)=0.
	467	endif
	468	ENDDO
	469
	470	! Set albedo and emissivity of the surface
	471	! ----------------------------------------
	472	CALL albedocaps(zls,ngrid,piceco2,psolaralb,emisref)
	473
	474	! set pemisurf() to emissiv when there is bare surface (needed for co2snow)
	475	DO ig=1,ngrid
	476	if (piceco2(ig).eq.0) then
	477	pemisurf(ig)=emissiv
	478	endif
	479	ENDDO
	480
	481	! firstcall2=.false.
	482	c ***************************************************************
	483	c Correction to account for redistribution between sigma or hybrid
	484	c layers when changing surface pressure (and warming/cooling
	485	c of the CO2 currently changing phase).
	486	c *************************************************************
	487
	488	DO ig=1,ngrid
	489	if (condsub(ig)) then
	490	do l=1,nlayer
	491	ztc(l) =zt(ig,l) +pdtc(ig,l) *ptimestep
	492	zu(l) =pu(ig,l) +pdu( ig,l) *ptimestep
	493	zv(l) =pv(ig,l) +pdv( ig,l) *ptimestep
[1036]	494	do iq=1,nq
[2184]	495	zqc(l,iq)=zq(ig,l,iq)+zdq_scav(ig,l,iq)*ptimestep ! zdq_scav=0 if watercloud=false
[38]	496	enddo
[2184]	497	enddo
[38]	498
	499	c Mass fluxes through the sigma levels (kg.m-2.s-1) (>0 when up)
	500	c """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
	501
	502	zmflux(1) = -zcondices(ig)
	503	DO l=1,nlayer
	504	zmflux(l+1) = zmflux(l) -zcondicea(ig,l)
[1438]	505	#ifndef MESOSCALE
[38]	506	& + (bp(l)-bp(l+1))*(zfallice(ig,1)-zmflux(1))
	507	c zmflux set to 0 if very low to avoid: top layer is disappearing in v1ld
	508	if (abs(zmflux(l+1)).lt.1E-13.OR.bp(l+1).eq.0.) zmflux(l+1)=0.
[1438]	509	#else
	510	if (abs(zmflux(l+1)).lt.1E-13) zmflux(l+1)=0.
	511	#endif
[38]	512	END DO
	513
[2155]	514	#ifdef MESOSCALE
	515	print*,"absurd mass set because bp not available"
	516	print*,"TO BE FIXED"
	517	#else
[2124]	518	c Mass of each layer at the end of timestep
	519	c -----------------------------------------
[38]	520	DO l=1,nlayer
[2124]	521	masse(l)=( pplev(ig,l) - pplev(ig,l+1) +
	522	& (bp(l)-bp(l+1))pdpsrf(ig)ptimestep)/g
[38]	523	END DO
[2155]	524	#endif
[38]	525
	526	c Corresponding fluxes for T,U,V,Q
	527	c """"""""""""""""""""""""""""""""
	528
	529	c averaging operator for TRANSPORT
	530	c """"""""""""""""""""""""""""""""
	531	c Value transfert at the surface interface when condensation
	532	c sublimation:
	533	ztm(1) = ztsrf(ig) + pdtsrfc(ig)*ptimestep
	534	zum(1) = 0
	535	zvm(1) = 0
[1036]	536	do iq=1,nq
[38]	537	zqm(1,iq)=0. ! most tracer do not condense !
	538	enddo
	539	c Special case if one of the tracer is CO2 gas
	540	if (ico2.ne.0) zqm(1,ico2)=1. ! flux is 100% CO2
	541
	542	c Van Leer scheme:
	543	DO l=1,nlayer+1
	544	w(l)=-zmflux(l)*ptimestep
	545	END DO
[1269]	546	call vl1d(nlayer,ztc,2.,masse,w,ztm)
	547	call vl1d(nlayer,zu ,2.,masse,w,zum)
	548	call vl1d(nlayer,zv ,2.,masse,w,zvm)
[2322]	549	! MVals: loop over the fathers ("peres")
	550	do iq=1,nqperes
[38]	551	do l=1,nlayer
[2184]	552	zq1(l)=zqc(l,iq)
[38]	553	enddo
	554	zqm1(1)=zqm(1,iq)
[1269]	555	call vl1d(nlayer,zq1,2.,masse,w,zqm1)
[38]	556	do l=2,nlayer
[2184]	557	zqc(l,iq)=zq1(l)
[38]	558	zqm(l,iq)=zqm1(l)
	559	enddo
[2322]	560	! MVals: loop over the sons ("fils")
	561	if (nqfils(iq).gt.0) then
[2332]	562	if (iq.eq.igcm_h2o_ice) then
	563	iq2=igcm_hdo_ice
	564	else if (iq.eq.igcm_h2o_vap) then
	565	iq2=igcm_hdo_vap
	566	else
	567	call abort_physic("co2condens_mod","invalid isotope",1)
	568	endif
[2322]	569	do l=1,nlayer
	570	if (zqc(l,iq).gt.qperemin) then
	571	Ratio1(l)=zqc(l,iq2)/zqc(l,iq)
	572	else
	573	Ratio1(l)=0.
	574	endif
	575	masseq(l)=max(masse(l)*zqc(l,iq),masseqmin)
	576	wq(l)=w(l)*zqm(l,iq)
	577	enddo
	578	Ratiom1(1)=zqm(1,iq2)
	579	call vl1d(nlayer,Ratio1,2.,masseq,wq,Ratiom1)
	580	zqm(1,iq2)=Ratiom1(1)*zqc(1,iq)
	581	do l=2,nlayer
	582	zqm(l,iq2)=Ratiom1(l)*zqm(l,iq)
	583	enddo
	584	endif !if (nqfils(iq).gt.0) then
	585	enddo !iq=1,nqperes
[38]	586
	587	c Surface condensation affects low winds
	588	if (zmflux(1).lt.0) then
	589	zum(1)= zu(1) * (w(1)/masse(1))
	590	zvm(1)= zv(1) * (w(1)/masse(1))
	591	if (w(1).gt.masse(1)) then ! ensure numerical stability
	592	zum(1)= (zu(1)-zum(2))*masse(1)/w(1) + zum(2)
	593	zvm(1)= (zv(1)-zvm(2))*masse(1)/w(1) + zvm(2)
	594	end if
	595	end if
	596
	597	ztm(nlayer+1)= ztc(nlayer) ! should not be used, but...
	598	zum(nlayer+1)= zu(nlayer) ! should not be used, but...
	599	zvm(nlayer+1)= zv(nlayer) ! should not be used, but...
[1036]	600	do iq=1,nq
[2184]	601	zqm(nlayer+1,iq)= zqc(nlayer,iq)
[38]	602	enddo
[86]	603
	604	#ifdef MESOSCALE
	605	!!!! AS: This part must be commented in the mesoscale model
	606	!!!! AS: ... to avoid instabilities.
	607	!!!! AS: you have to compile with -DMESOSCALE to do so
	608	#else
[38]	609	c Tendencies on T, U, V, Q
	610	c """"""""""""""""""""""""
	611	DO l=1,nlayer
[1996]	612	IF(.not. co2clouds) THEN
[38]	613	c Tendencies on T
	614	zdtsig(ig,l) = (1/masse(l)) *
	615	& ( zmflux(l)*(ztm(l) - ztc(l))
	616	& - zmflux(l+1)*(ztm(l+1) - ztc(l))
	617	& + zcondicea(ig,l)*(ztcond(ig,l)-ztc(l)) )
[1996]	618	ELSE
	619	zdtsig(ig,l) = (1/masse(l)) *
	620	& ( zmflux(l)*(ztm(l) - ztc(l))
	621	& - zmflux(l+1)*(ztm(l+1) - ztc(l)))
	622	ENDIF
	623	c D.BARDET: for diagnotics
	624	zmflux3D(ig,l)=zmflux(l)
	625	ztm3D(ig,l)=ztm(l)
	626	ztc3D(ig,l)=ztc(l)
	627
[38]	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
[1114]	642
[86]	643	#endif
[38]	644
	645	c Tendencies on Q
[1036]	646	do iq=1,nq
[38]	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)) *
[2184]	652	& ( zmflux(l)*(zqm(l,iq) - zqc(l,iq))
	653	& - zmflux(l+1)*(zqm(l+1,iq) - zqc(l,iq))
	654	& + zcondicea(ig,l)*(zqc(l,iq)-1.) )
[38]	655	END DO
	656	else
	657	DO l=1,nlayer
	658	pdqc(ig,l,iq)= (1/masse(l)) *
[2184]	659	& ( zmflux(l)*(zqm(l,iq) - zqc(l,iq))
	660	& - zmflux(l+1)*(zqm(l+1,iq) - zqc(l,iq))
	661	& + zcondicea(ig,l)*zqc(l,iq) )
	662
	663	pdqc(ig,l,iq)=pdqc(ig,l,iq)+zdq_scav(ig,l,iq) ! zdq_scav=0 if watercloud=false
[38]	664	END DO
	665	end if
	666	enddo
	667
	668	end if ! if (condsub)
	669	END DO ! loop on ig
	670
	671	c ***************************************************************
	672	c CO2 snow / clouds scheme
	673	c ***************************************************************
	674
	675	call co2snow(ngrid,nlayer,ptimestep,emisref,condsub,pplev,
	676	& zcondicea,zcondices,zfallice,pemisurf)
	677
	678	c ***************************************************************
	679	c Ecriture des diagnostiques
	680	c ***************************************************************
	681
	682	c DO l=1,nlayer
	683	c DO ig=1,ngrid
	684	c Taux de cond en kg.m-2.pa-1.s-1
	685	c tconda1(ig,l)=zcondicea(ig,l)/(pplev(ig,l)-pplev(ig,l+1))
	686	c Taux de cond en kg.m-3.s-1
	687	c tconda2(ig,l)=tconda1(ig,l)pplay(ig,l)g/(r*pt(ig,l))
	688	c END DO
	689	c END DO
[1047]	690	c call WRITEDIAGFI(ngrid,'tconda1',
[38]	691	c &'Taux de condensation CO2 atmospherique /Pa',
	692	c & 'kg.m-2.Pa-1.s-1',3,tconda1)
[1047]	693	c call WRITEDIAGFI(ngrid,'tconda2',
[38]	694	c &'Taux de condensation CO2 atmospherique /m',
	695	c & 'kg.m-3.s-1',3,tconda2)
	696
	697	! output falling co2 ice in 1st layer:
[1047]	698	! call WRITEDIAGFI(ngrid,'fallice',
[38]	699	! &'Precipitation of co2 ice',
	700	! & 'kg.m-2.s-1',2,zfallice(1,1))
	701
[1114]	702	#ifndef MESOSCALE
	703	! Extra special case for surface temperature tendency pdtsrfc:
	704	! we want to fix the south pole temperature to CO2 condensation temperature
	705	if (caps.and.(obliquit.lt.27.)) then
	706	! check if last grid point is the south pole
[1541]	707	if (abs(latitude(ngrid)-(-pi/2.)).lt.1.e-5) then
[1114]	708	! NB: Updated surface pressure, at grid point 'ngrid', is
	709	! ps(ngrid)=pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep
[2124]	710	! write(,) "co2condens: South pole: latitude(ngrid)=",
[1541]	711	! & latitude(ngrid)
[1114]	712	ztcondsol(ngrid)=
	713	& 1./(bcond-acondlog(.01vmr_co2(ngrid,1)*
	714	& (pplev(ngrid,1)+pdpsrf(ngrid)*ptimestep)))
	715	pdtsrfc(ngrid)=(ztcondsol(ngrid)-ztsrf(ngrid))/ptimestep
	716	endif
	717	endif
	718	#endif
	719
[2009]	720	END SUBROUTINE co2condens
[38]	721
	722
	723
	724	c *****************************************************************
[1269]	725	SUBROUTINE vl1d(nlayer,q,pente_max,masse,w,qm)
[38]	726	c
	727	c
	728	c Operateur de moyenne inter-couche pour calcul de transport type
	729	c Van-Leer " pseudo amont " dans la verticale
	730	c q,w sont des arguments d'entree pour le s-pg ....
	731	c masse : masse de la couche Dp/g
	732	c w : masse d'atm ``transferee'' a chaque pas de temps (kg.m-2)
	733	c pente_max = 2 conseillee
	734	c
	735	c
	736	c --------------------------------------------------------------------
	737	IMPLICIT NONE
	738
	739	c
	740	c
	741	c
	742	c Arguments:
	743	c ----------
[1270]	744	integer nlayer
[1269]	745	real masse(nlayer),pente_max
	746	REAL q(nlayer),qm(nlayer+1)
	747	REAL w(nlayer+1)
[38]	748	c
	749	c Local
	750	c ---------
	751	c
	752	INTEGER l
	753	c
[1269]	754	real dzq(nlayer),dzqw(nlayer),adzqw(nlayer),dzqmax
[38]	755	real sigw, Mtot, MQtot
	756	integer m
	757	c integer ismax,ismin
	758
	759
	760	c On oriente tout dans le sens de la pression
	761	c W > 0 WHEN DOWN !!!!!!!!!!!!!
	762
[1269]	763	do l=2,nlayer
[38]	764	dzqw(l)=q(l-1)-q(l)
	765	adzqw(l)=abs(dzqw(l))
	766	enddo
	767
[1269]	768	do l=2,nlayer-1
[38]	769	if(dzqw(l)*dzqw(l+1).gt.0.) then
	770	dzq(l)=0.5*(dzqw(l)+dzqw(l+1))
	771	else
	772	dzq(l)=0.
	773	endif
	774	dzqmax=pente_max*min(adzqw(l),adzqw(l+1))
	775	dzq(l)=sign(min(abs(dzq(l)),dzqmax),dzq(l))
	776	enddo
	777
	778	dzq(1)=0.
[1269]	779	dzq(nlayer)=0.
[38]	780
[1269]	781	do l = 1,nlayer-1
[38]	782
	783	c Regular scheme (transfered mass < layer mass)
	784	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	785	if(w(l+1).gt.0. .and. w(l+1).le.masse(l+1)) then
	786	sigw=w(l+1)/masse(l+1)
	787	qm(l+1)=(q(l+1)+0.5(1.-sigw)dzq(l+1))
	788	else if(w(l+1).le.0. .and. -w(l+1).le.masse(l)) then
	789	sigw=w(l+1)/masse(l)
	790	qm(l+1)=(q(l)-0.5(1.+sigw)dzq(l))
	791
	792	c Extended scheme (transfered mass > layer mass)
	793	c ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	794	else if(w(l+1).gt.0.) then
	795	m=l+1
	796	Mtot = masse(m)
	797	MQtot = masse(m)*q(m)
[1269]	798	do while ((m.lt.nlayer).and.(w(l+1).gt.(Mtot+masse(m+1))))
[38]	799	m=m+1
	800	Mtot = Mtot + masse(m)
	801	MQtot = MQtot + masse(m)*q(m)
	802	end do
[1269]	803	if (m.lt.nlayer) then
[38]	804	sigw=(w(l+1)-Mtot)/masse(m+1)
	805	qm(l+1)= (1/w(l+1))(MQtot + (w(l+1)-Mtot)
	806	& (q(m+1)+0.5(1.-sigw)dzq(m+1)) )
	807	else
	808	w(l+1) = Mtot
	809	qm(l+1) = Mqtot / Mtot
[2399]	810	CALL abort_physic('co2condens',
	811	& 'top layer is disapearing !', 1)
[38]	812	end if
	813	else ! if(w(l+1).lt.0)
	814	m = l-1
	815	Mtot = masse(m+1)
	816	MQtot = masse(m+1)*q(m+1)
[120]	817	if (m.gt.0) then ! because some compilers will have problems
	818	! evaluating masse(0)
	819	do while ((m.gt.0).and.(-w(l+1).gt.(Mtot+masse(m))))
[38]	820	m=m-1
	821	Mtot = Mtot + masse(m+1)
	822	MQtot = MQtot + masse(m+1)*q(m+1)
[120]	823	if (m.eq.0) exit
	824	end do
	825	endif
[38]	826	if (m.gt.0) then
	827	sigw=(w(l+1)+Mtot)/masse(m)
	828	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)
	829	& (q(m)-0.5(1.+sigw)dzq(m)) )
	830	else
	831	qm(l+1)= (-1/w(l+1))(MQtot + (-w(l+1)-Mtot)qm(1))
	832	end if
	833	end if
	834	enddo
	835
[2124]	836	c boundary conditions (not used in co2condens !!)
[1269]	837	c qm(nlayer+1)=0.
[38]	838	c if(w(1).gt.0.) then
	839	c qm(1)=q(1)
	840	c else
	841	c qm(1)=0.
	842	c end if
	843
[2009]	844	END SUBROUTINE vl1d
[2184]	845
	846	c *****************************************************************
	847	SUBROUTINE scavenging_by_co2(ngrid,nlayer,nq,ptimestep,pplev,pq,
	848	& rdust,pcondicea,pfallice,pdq_scav,pdqsc)
	849
	850	c
	851	c
	852	c Calcul de la quantite de poussiere lessivee par les nuages de CO2
	853	c
	854	c --------------------------------------------------------------------
	855	use tracer_mod, only: nqmx, igcm_h2o_vap, igcm_h2o_ice,
	856	& igcm_dust_mass, igcm_dust_number,
	857	& igcm_ccn_mass, igcm_ccn_number,
	858	& rho_dust, nuice_sed, nuice_ref,r3n_q
	859	use comcstfi_h, only: g
[2409]	860	use dust_param_mod, only: freedust
[2184]	861	IMPLICIT NONE
[2409]	862	include "callkeys.h" ! for the flags water and microphys
[2184]	863	c
	864	c
	865	c Arguments:
	866	INTEGER,INTENT(IN) :: ngrid ! number of atmospheric columns
	867	INTEGER,INTENT(IN) :: nlayer ! number of vertical layers
	868	INTEGER,INTENT(IN) :: nq ! number of tracers
	869	REAL,INTENT(IN) :: ptimestep ! physics timestep (s)
	870	REAL,INTENT(IN) :: pplev(ngrid,nlayer+1) ! inter-layer pressure (Pa)
	871	REAL,INTENT(IN) :: pq(ngrid,nlayer,nq)
	872	REAL,INTENT(IN) :: rdust(ngrid,nlayer) ! dust effective radius
	873	REAL,INTENT(IN) :: pcondicea(ngrid,nlayer) ! condensation rate in layer l (kg/m2/s)
	874	REAL,INTENT(IN) :: pfallice(ngrid,nlayer+1) ! amount of ice falling from layer l (kg/m2/s)
	875
	876	REAL,INTENT(OUT) :: pdq_scav(ngrid,nlayer,nq) ! tendancy due to scavenging by co2
	877	REAL,INTENT(OUT) :: pdqsc(ngrid,nq) ! tendency on surface tracers
	878
	879	c Locals:
	880	INTEGER l,ig
	881	REAL scav_ratio_dust, scav_ratio_wice ! ratio of the dust/water ice mass mixing ratios in condensing CO2 ice and in air
	882	REAL scav_dust_mass(nlayer+1) ! dust flux (mass) scavenged towards the lower layer (kg/m2/s) (POSITIVE WHEN DOWNWARD)
	883	REAL scav_dust_number(nlayer+1) ! dust flux (number) scavenged towards the lower layer (kg/m2/s) (POSITIVE WHEN DOWNWARD)
	884	REAL scav_ccn_mass(nlayer+1) ! ccn flux (mass) scavenged towards the lower layer
	885	REAL scav_ccn_number(nlayer+1) ! ccn flux (number) scavenged towards the lower layer
	886	REAL scav_h2o_ice(nlayer+1) ! water ice flux (mass) scavenged towards the lower layer
	887	REAL massl ! mass of the layer l at point ig (kg/m2)
	888
	889	c Initialization:
	890	scav_ratio_dust = 100 !1 !10 !100 !1000
	891	scav_ratio_wice = scav_ratio_dust
	892	pdq_scav(:,:,:)=0.
	893
	894	DO ig=1,ngrid
	895	scav_dust_mass(nlayer+1)=0.
	896	scav_dust_number(nlayer+1)=0.
	897	scav_ccn_mass(nlayer+1)=0.
	898	scav_ccn_number(nlayer+1)=0.
	899	scav_h2o_ice(nlayer+1)=0.
	900
	901	DO l=nlayer , 1, -1
	902	massl=(pplev(ig,l)-pplev(ig,l+1))/g
	903	IF(pcondicea(ig,l).GT.0.)THEN ! if CO2 condenses and traps dust/water ice
	904	! Calculation of the tendencies
	905	if (freedust) then
	906	pdq_scav(ig,l,igcm_dust_mass)=-pq(ig,l,igcm_dust_mass)
	907	& /ptimestep*(1-exp(
	908	& -scav_ratio_dustpcondicea(ig,l)ptimestep/massl))
	909
	910	pdq_scav(ig,l,igcm_dust_number)=pdq_scav(ig,l,igcm_dust_mass)
	911	& *r3n_q/rdust(ig,l)
	912	endif
	913	if (freedust.AND.microphys) then
	914	pdq_scav(ig,l,igcm_ccn_mass)=-pq(ig,l,igcm_ccn_mass)
	915	& /ptimestep*(1-exp(
	916	& -scav_ratio_wicepcondicea(ig,l)ptimestep/massl))
	917	pdq_scav(ig,l,igcm_ccn_number)=pdq_scav(ig,l,igcm_ccn_mass)
	918	& *r3n_q/rdust(ig,l)
	919	endif
	920	if (water) then
	921	pdq_scav(ig,l,igcm_h2o_ice)=-pq(ig,l,igcm_h2o_ice)
	922	& /ptimestep*(1-exp(
	923	& -scav_ratio_wicepcondicea(ig,l)ptimestep/massl))
	924	endif
	925
	926	ELSE IF(pcondicea(ig,l).LT.0.)THEN ! if CO2 sublimates and releases dust/water ice
	927	! Calculation of the tendencies
	928	if (freedust) then
	929	pdq_scav(ig,l,igcm_dust_mass)=-pcondicea(ig,l)/massl*
	930	& scav_dust_mass(l+1)/pfallice(ig,l+1)
	931
	932	pdq_scav(ig,l,igcm_dust_number)=-pcondicea(ig,l)/massl*
	933	& scav_dust_number(l+1)/pfallice(ig,l+1)
	934	endif
	935	if (freedust.AND.microphys) then
	936	pdq_scav(ig,l,igcm_ccn_mass)=-pcondicea(ig,l)/massl*
	937	& scav_ccn_mass(l+1)/pfallice(ig,l+1)
	938
	939	pdq_scav(ig,l,igcm_ccn_number)=-pcondicea(ig,l)/massl*
	940	& scav_ccn_number(l+1)/pfallice(ig,l+1)
	941	endif
	942	if (water) then
	943	pdq_scav(ig,l,igcm_h2o_ice)=-pcondicea(ig,l)/massl*
	944	& scav_h2o_ice(l+1)/pfallice(ig,l+1)
	945	endif
	946
	947	END IF
	948	! Calculation of the scavenged dust/wice flux towards the lower layers
	949	if (freedust) then
	950	scav_dust_mass(l)=-pdq_scav(ig,l,igcm_dust_mass)*massl
	951	& +scav_dust_mass(l+1)
	952
	953	scav_dust_number(l)=-pdq_scav(ig,l,igcm_dust_number)*massl
	954	& +scav_dust_number(l+1)
	955	endif
	956	if (freedust.AND.microphys) then
	957	scav_ccn_mass(l)=-pdq_scav(ig,l,igcm_ccn_mass)*massl
	958	& +scav_ccn_mass(l+1)
	959
	960	scav_ccn_number(l)=-pdq_scav(ig,l,igcm_ccn_number)*massl
	961	& +scav_dust_number(l+1)
	962	endif
	963	if (water) then
	964	scav_h2o_ice(l)=-pdq_scav(ig,l,igcm_h2o_ice)*massl
	965	& +scav_h2o_ice(l+1)
	966	endif
	967
	968	ENDDO
	969	! Calculation of the surface tendencies
	970	pdqsc(ig,igcm_dust_mass)=0.
	971	pdqsc(ig,igcm_dust_number)=0.
	972
	973	if (freedust) then
	974	pdqsc(ig,igcm_dust_mass)=pdqsc(ig,igcm_dust_mass)
	975	& +scav_dust_mass(1)
	976	pdqsc(ig,igcm_dust_number)=pdqsc(ig,igcm_dust_number)
	977	& +scav_dust_number(1)
	978	endif
	979	if (freedust.AND.microphys) then
	980	pdqsc(ig,igcm_dust_mass)=pdqsc(ig,igcm_dust_mass)
	981	& +scav_ccn_mass(1)
	982	pdqsc(ig,igcm_dust_number)=pdqsc(ig,igcm_dust_number)
	983	& +scav_ccn_number(1)
	984	endif
	985	if (water) then
	986	pdqsc(ig,igcm_h2o_ice)=scav_h2o_ice(1)
	987	endif
	988	ENDDO
	989
	990	END SUBROUTINE scavenging_by_co2
	991
[2009]	992	END MODULE co2condens_mod

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