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calchim.F90 @ 3026

Last change on this file since 3026 was 2368, checked in by jvatant, 5 years ago
Titan GCM:Fix missing MESOSCALE cpp key in calchim
File size: 22.8 KB

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1	SUBROUTINE calchim(ngrid,qy_c,declin,dtchim, &
2	ctemp,cpphi,cpphis,cplay,cplev,czlay,czlev,dqyc)
3
4	!---------------------------------------------------------------------------------------------------------
5	!
6	! Purpose : Interface subroutine to photochemical C model for Titan GCM.
7	! -------
8	! The subroutine computes the chemical processes for a single vertical column.
9	!
10	! - Only tendencies are returned.
11	! - With moyzon_ch=.true. and input vectors zonally averaged
12	! the calculation is done only once per lat. band
13	!
14	! Authors: + S. Lebonnois : 01/2000 \| 09/2003
15	! ------- adaptation for Titan 3D : 02/2009
16	! adaptation for // : 04/2013
17	! extension chemistry up to 1300km : 10/2013
18	!
19	! + J. Vatant d'Ollone
20	! + 02/17 - adaptation for the new generic-forked physics
21	! + 01/18 - 03/18 - Major transformations :
22	! - Upper chemistry fields are now stored in startfi
23	! and defined on a pressure grid from Vervack profile
24	! - These modifs enables to run chemistry with others resolution than 32x48x55 !
25	! - Only the actinic fluxes are still read in a 49-lat input but interp. on lat grid
26	! - Chemistry can still be done in 2D
27	! -> Calcul. once per band lat and put same tendency in all longi.
28	! Check for negs in physiq_mod.
29	! -> If procs sharing a lat band, no problem, the calcul will just be done twice.
30	! -> Will not work with Dynamico, where the chemistry will have to be done in 3D.
31	! ( and there'll be work to do to get rid of averaged fields )
32	!
33	! + 02/19 : To always have correct photodissociations rates, altitudes sent here by physiq are always
34	! calculated with effective g - and with reference to the body not the local surface -
35	! even if in physiq we keep altitudes coherent with dynamics !
36	!
37	! + STILL TO DO : + Replug the interaction with haze (cf titan.old) -> to see with JB.
38	! + Use iso_c_binding for the fortran-C exchanges.
39	!---------------------------------------------------------------------------------------------------------
40
41	! --------------------------------------------------------------------
42	! Structure :
43	! -----------
44	! 0. Declarations
45	! I. Init and firstcall
46	! 1. Read and store Vervack profile
47	! 2. Compute planetar averaged atm. properties
48	! 3. Init compound caracteristics
49	! 4. Init photodissociations rates from actinic fluxes
50	! 5. Init chemical reactions
51	! 6. Init eddy diffusion coeff
52	! II. Loop on latitudes/grid-points
53	! 0. Check on 2D chemistry
54	! 1. Compute atm. properties at grid points
55	! 2. Interpolate photodissociation rates at lat,alt,dec
56	! 3. Read composition
57	! 4. Call main solver gptitan C routine
58	! 5. Calculate output tendencies on advected tracers
59	! 6. Update upper chemistry fields
60	! 0bis. If 2D chemsitry, don't recalculate if needed
61	! -----------------------------------------------------------------
62
63	USE, INTRINSIC :: iso_c_binding
64	USE comchem_h
65	USE dimphy
66	USE datafile_mod, ONLY: datadir
67	USE comcstfi_mod, ONLY: g, rad, pi, r, kbol
68	USE geometry_mod, ONLY: latitude
69	#ifndef MESOSCALE
70	USE logic_mod, ONLY: moyzon_ch
71	USE moyzon_mod, ONLY: tmoy, playmoy
72	#endif
73
74	IMPLICIT NONE
75
76	! ------------------------------------------
77	! ********* 0. Declarations ***********
78	! ------------------------------------------
79
80	! Arguments
81	! ---------
82
83	INTEGER, INTENT(IN) :: ngrid ! Number of atmospheric columns.
84	REAL*8, DIMENSION(ngrid,klev,nkim), INTENT(IN) :: qy_c ! Chemical species on GCM layers after adv.+diss. (mol/mol).
85	REAL*8, INTENT(IN) :: declin ! Solar declination (rad).
86	REAL*8, INTENT(IN) :: dtchim ! Chemistry timsetep (s).
87	REAL*8, DIMENSION(ngrid,klev), INTENT(IN) :: ctemp ! Mid-layer temperature (K).
88	REAL*8, DIMENSION(ngrid,klev), INTENT(IN) :: cpphi ! Mid-layer geopotential (m2.s-2).
89	REAL*8, DIMENSION(ngrid), INTENT(IN) :: cpphis ! Surface geopotential (m2.s-2).
90	REAL*8, DIMENSION(ngrid,klev), INTENT(IN) :: cplay ! Mid-layer pressure (Pa).
91	REAL*8, DIMENSION(ngrid,klev+1), INTENT(IN) :: cplev ! Inter-layer pressure (Pa).
92	REAL*8, DIMENSION(ngrid,klev), INTENT(IN) :: czlay ! Mid-layer effective altitude (m) : ref = geoid.
93	REAL*8, DIMENSION(ngrid,klev+1), INTENT(IN) :: czlev ! Inter-layer effective altitude (m) ref = geoid.
94
95	REAL*8, DIMENSION(ngrid,klev,nkim), INTENT(OUT) :: dqyc ! Chemical species tendencies on GCM layers (mol/mol/s).
96
97	! Local variables :
98	! -----------------
99
100	INTEGER :: i , l, ic, ig, igm1
101
102	INTEGER :: dec, idec, ipres, ialt, klat
103
104	REAL*8 :: declin_c ! Declination (deg).
105	REAL*8 :: factp, factalt, factdec, factlat, krpddec, krpddecp1, krpddecm1
106	REAL*8 :: temp1, logp
107
108	! Variables sent into chemistry module (must be in double precision)
109	! ------------------------------------------------------------------
110
111	REAL*8, DIMENSION(nlaykim_tot) :: temp_c ! Temperature (K).
112	REAL*8, DIMENSION(nlaykim_tot) :: press_c ! Pressure (Pa).
113	REAL*8, DIMENSION(nlaykim_tot) :: phi_c ! Geopotential (m2.s-2) - actually not sent in chem. module but used to compute alts.
114	REAL*8, DIMENSION(nlaykim_tot) :: nb ! Density (cm-3).
115
116	REAL*8, DIMENSION(nlaykim_tot,nkim) :: cqy ! Chemical species in whole column (mol/mol) sent to chem. module.
117	REAL*8, DIMENSION(nlaykim_tot,nkim) :: cqy0 ! " " " " " " before modifs.
118
119	REAL*8 :: surfhaze(nlaykim_tot)
120	REAL*8 :: cprodaer(nlaykim_tot,4), cmaer(nlaykim_tot,4)
121	REAL*8 :: ccsn(nlaykim_tot,4), ccsh(nlaykim_tot,4)
122
123	REAL*8, DIMENSION(nlaykim_tot) :: rmil ! Mid-layer distance (km) to planetographic center.
124	REAL*8, DIMENSION(nlaykim_tot) :: rinter ! Inter-layer distance (km) to planetographic center (RA grid in chem. module).
125	! NB : rinter is on nlaykim_tot too, we don't care of the uppermost layer upper boundary altitude.
126
127	! Saved variables initialized at firstcall
128	! ----------------------------------------
129
130	LOGICAL, SAVE :: firstcall = .TRUE.
131	!$OMP THREADPRIVATE(firstcall)
132
133	REAL*8, DIMENSION(:), ALLOCATABLE, SAVE :: kedd ! Eddy mixing coefficient for upper chemistry (cm^2.s-1)
134	!$OMP THREADPRIVATE(kedd)
135
136	REAL*8, DIMENSION(:,:), ALLOCATABLE, SAVE :: md ! Mean molecular diffusion coefficients (cm^2.s-1)
137	REAL*8, DIMENSION(:), ALLOCATABLE, SAVE :: mass ! Molar mass of the compounds (g.mol-1)
138	!$OMP THREADPRIVATE(mass,md)
139
140	REAL*8, DIMENSION(:), ALLOCATABLE, SAVE :: r1d, ct1d, p1d, t1d ! Vervack profile
141	! JVO 18 : No threadprivate for those as they'll be read in tcp.ver by master
142
143	REAL*8, DIMENSION(:,:,:,:), ALLOCATABLE, SAVE :: krpd ! Photodissociations rate table
144	REAL*8, DIMENSION(:,:) , ALLOCATABLE, SAVE :: krate ! Reactions rate ( photo + chem )
145	!$OMP THREADPRIVATE(krpd,krate)
146
147	INTEGER, DIMENSION(:), ALLOCATABLE, SAVE :: nom_prod, nom_perte
148	INTEGER, DIMENSION(:,:), ALLOCATABLE, SAVE :: reactif
149	INTEGER, DIMENSION(:,:), ALLOCATABLE, SAVE :: prod
150	INTEGER, DIMENSION(:,:,:), ALLOCATABLE, SAVE :: perte
151	!$OMP THREADPRIVATE(nom_prod,nom_perte,reactif,prod,perte)
152
153	! TEMPORARY : Dummy parameters without microphysics
154	! Here to keep the whole stuff running without modif chem. module
155	! ---------------------------------------------------------------
156
157	INTEGER :: utilaer(16)
158	INTEGER :: aerprod = 0
159	INTEGER :: htoh2 = 0
160
161	! -----------------------------------------------------------------------
162	! *************** I. Initialisations and Firstcall ******************
163	! -----------------------------------------------------------------------
164
165	IF (firstcall) THEN
166
167	PRINT*, 'CHIMIE, premier appel'
168
169	if (ngrid .eq. 1) then ! if 1D no dynamic mixing, we set the kedd in all column
170	call check(nlaykim_tot,0,nlrt_kim,nkim)
171	else
172	call check(nlaykim_tot,klev-15,nlrt_kim,nkim)
173	endif
174
175	ALLOCATE(r1d(131))
176	ALLOCATE(ct1d(131))
177	ALLOCATE(p1d(131))
178	ALLOCATE(t1d(131))
179
180	ALLOCATE(md(nlaykim_tot,nkim))
181	ALLOCATE(mass(nkim))
182
183	ALLOCATE(kedd(nlaykim_tot))
184
185	ALLOCATE(krate(nlaykim_tot,nr_kim))
186	ALLOCATE(krpd(nd_kim+1,nlrt_kim,15,nlat_actfluxes))
187
188	ALLOCATE(nom_prod(nkim))
189	ALLOCATE(nom_perte(nkim))
190	ALLOCATE(reactif(5,nr_kim))
191	ALLOCATE(prod(200,nkim))
192	ALLOCATE(perte(2,200,nkim))
193
194	! 0. Deal with characters for C-interoperability
195	! ----------------------------------------------
196	! NB ( JVO 19 ) : Using iso_c_binding would do things in an even cleaner way !
197	DO ic=1,nkim
198	nomqy_c(ic) = trim(cnames(ic))//char(0) ! Add the C null terminator
199	ENDDO
200	nomqy_c(nkim+1)="HV"//char(0) ! For photodissociations
201
202	! 1. Read Vervack profile "tcp.ver", once for all
203	! -----------------------------------------------
204
205	!$OMP MASTER
206	OPEN(11,FILE=TRIM(datadir)//'/tcp.ver',STATUS='old')
207	READ(11,*)
208	DO i=1,131
209	READ(11,*) r1d(i), t1d(i), ct1d(i), p1d(i)
210	! For debug :
211	! -----------
212	! PRINT*, "tcp.ver", r1d(i), t1d(i), ct1d(i), p1d(i)
213	ENDDO
214	CLOSE(11)
215	!$OMP END MASTER
216	!$OMP BARRIER
217
218	! 2. Calculation of temp_c, densities and altitudes in planetary average
219	! ----------------------------------------------------------------------
220
221	! JVO18 : altitudes are no more calculated in firstcall, as I set kedd in pressure grid
222
223	! a. For GCM layers we just copy-paste ( assuming that physiq always send correct altitudes ! )
224
225	PRINT*,'Init chemistry : pressure, density, temperature ... :'
226	PRINT*,'level, press_c (mbar), nb (cm-3), temp_c (K)'
227
228	#ifndef MESOSCALE
229	!! JVO 20 : I put this CPP key because mesoscale cannot access tmoy and playmoy,
230	! you should fix this when you will propeerly use chemistry !
231
232	IF (ngrid.NE.1) THEN
233	DO l=1,klev
234	temp_c(l) = tmoy(l) ! K
235	press_c(l) = playmoy(l)/100. ! mbar
236	nb(l) = 1.e-4press_c(l) / (kboltemp_c(l)) ! cm-3
237	PRINT*, l, press_c(l), nb(l), temp_c(l)
238	ENDDO
239	ELSE
240	#endif
241	DO l=1,klev
242	temp_c(l) = ctemp(1,l) ! K
243	press_c(l) = cplay(1,l)/100. ! mbar
244	nb(l) = 1.e-4press_c(l) / (kboltemp_c(l)) ! cm-3
245	PRINT*, l, press_c(l), nb(l), temp_c(l)
246	ENDDO
247	#ifndef MESOSCALE
248	ENDIF
249	#endif
250
251	! b. Extension in upper atmosphere with Vervack profile
252	! NB : Maybe the transition klev/klev+1 is harsh if T profile different from Vervack ...
253
254	ipres=1
255	DO l=klev+1,nlaykim_tot
256	press_c(l) = preskim(l-klev) / 100.0
257	DO i=ipres,130
258	IF ( (press_c(l).LE.p1d(i)) .AND. (press_c(l).GT.p1d(i+1)) ) THEN
259	ipres=i
260	ENDIF
261	ENDDO
262	factp = (press_c(l)-p1d(ipres)) / (p1d(ipres+1)-p1d(ipres))
263
264	nb(l) = exp( log(ct1d(ipres))(1-factp) + log(ct1d(ipres+1)) factp )
265	temp_c(l) = t1d(ipres)(1-factp) + t1d(ipres+1)factp
266	PRINT*, l , press_c(l), nb(l), temp_c(l)
267	ENDDO
268
269	! 3. Compounds caracteristics
270	! ---------------------------
271	mass(:) = 0.0
272	call comp(nomqy_c,nb,temp_c,mass,md)
273	PRINT*,' Mass'
274	DO ic=1,nkim
275	PRINT*, nomqy_c(ic), mass(ic)
276	ENDDO
277
278	! 4. Photodissociation rates
279	! --------------------------
280	call disso(krpd,nlat_actfluxes)
281
282	! 5. Init. chemical reactions with planetary average T prof.
283	! ----------------------------------------------------------
284
285	! NB : Chemical reactions rate are assumed to be constant within the T range of Titan's atm
286	! so we fill their krate once for all but krate for photodiss will be filled at each timestep
287
288	call chimie(nomqy_c,nb,temp_c,krate,reactif, &
289	nom_perte,nom_prod,perte,prod)
290
291	! 6. Eddy mixing coefficients (constant with time and space)
292	! ----------------------------------------------------------
293
294	kedd(:) = 1.e3 ! Default value =/= zero
295
296	! NB : Eddy coeffs (e.g. Lavvas et al 08, Yelle et al 08) in altitude but they're rather linked to pressure
297	! Below GCM top we have dynamic mixing and for levs < nld=klev-15 the chem. solver ignores diffusion
298
299	!! First calculate kedd for upper chemistry layers
300	!DO l=klev-4,nlaykim_tot
301	! logp=-log10(press_c(l))
302	!! 2E6 at 400 km ~ 10-2 mbar
303	! IF ( logp.ge.2.0 .and. logp.le.3.0 ) THEN
304	! kedd(l) = 2.e6 * 5.0**(logp-2.0)
305	!! 1E7 at 500 km ~ 10-3 mbar
306	! ELSE IF ( logp.ge.3.0 .and. logp.le.4.0 ) THEN
307	! kedd(l) = 1.e7 * 3.0**(logp-3.0)
308	!! 3E7 above 700 km ~ 10-4 mbar
309	! ELSEIF ( logp.gt.4.0 ) THEN
310	! kedd(l) = 3.e7
311	! ENDIF
312	!ENDDO
313
314	! Kedd from (E7) in Vuitton 2019
315	if (ngrid .eq. 1) then ! if 1D no dynamic mixing, we set the kedd in all column
316	DO l=1,nlaykim_tot
317	kedd(l) = 300.0 * ( 1.0E2 / press_c(l) )*1.5 3.0E7 / &
318	( 300.0 * ( 1.0E2 / press_c(l) )**1.5 + 3.0E7 )
319	ENDDO
320	else
321	DO l=klev-4,nlaykim_tot
322	! JVO 18 : We keep the nominal profile in the GCM 5 upper layers
323	! to have a correct vertical mixing in the sponge layer
324	kedd(l) = 300.0 * ( 1.0E2 / press_c(l) )*1.5 3.0E7 / &
325	( 300.0 * ( 1.0E2 / press_c(l) )**1.5 + 3.0E7 )
326	ENDDO
327	endif
328
329	if (ngrid .gt. 1) then ! not in 1D, no dynamic mixing
330	! Then adjust 10 layers profile fading to default value depending on kedd(ptop)
331	DO l=klev-15,klev-5
332	temp1 = ( log10(press_c(l)/press_c(klev-15)) ) / ( log10(press_c(klev-4)/press_c(klev-15)) )
333	kedd(l) = 10.*( 3.0 + log10(kedd(klev-4)/1.e3) temp1 )
334	ENDDO
335	endif
336
337	firstcall = .FALSE.
338	ENDIF ! firstcall
339
340	declin_c = declin*180./pi
341
342	! -----------------------------------------------------------------------
343	! ********************* II. Loop on latitudes ***********************
344	! -----------------------------------------------------------------------
345
346	DO ig=1,ngrid
347
348	IF (ig.eq.1) THEN
349	igm1=1
350	ELSE
351	igm1=ig-1
352	ENDIF
353
354	! If 2D chemistry, trick to do the calculation only once per latitude band within the chunk
355	! NB1 : Will be obsolete with DYNAMICO, the chemistry will necessarly be 3D
356	! NB2 : Test of same latitude with dlat=0.1 : I think that if you run sims better than 1/10th degree then
357	! either it's with Dynamico and doesn't apply OR it is more than enough in terms of "preco / calc time" !
358	! -------------------------------------------------------------------------------------------------------
359
360	#ifndef MESOSCALE
361	IF ( ( moyzon_ch .AND. ( ig.EQ.1 .OR. (ABS(latitude(ig)-latitude(igm1)).GT.0.1*pi/180.0)) ) .OR. (.NOT. moyzon_ch) ) THEN
362	#endif
363	! 1. Compute altitude for the grid point with hydrostat. equilib.
364	! ---------------------------------------------------------------
365
366	! a. For GCM layers we just copy-paste
367	! JVO 19 : Now physiq always sent correct altitudes with effective g for chemistry ( even if it's not the case in physiq )
368
369	DO l=1,klev
370	rinter(l) = (czlev(ig,l)+rad)/1000.0 ! km
371	rmil(l) = (czlay(ig,l)+rad)/1000.0 ! km
372	temp_c(l) = ctemp(ig,l) ! K
373	phi_c(l) = cpphi(ig,l) ! m2.s-2
374	press_c(l) = cplay(ig,l)/100. ! mbar
375	nb(l) = 1.e-4press_c(l) / (kboltemp_c(l)) ! cm-3
376	ENDDO
377	rinter(klev+1)=( (czlay(ig,klev) + ( czlay(ig,klev) - czlev(ig,klev))) +rad )/1000. ! You shall not use czlev(zlev+1) whose value is 1.e7 !
378
379	! b. Extension in upper atmosphere with Vervack profile
380
381	ipres=1
382	DO l=klev+1,nlaykim_tot
383	press_c(l) = preskim(l-klev) / 100.0
384	DO i=ipres,130
385	IF ( (press_c(l).LE.p1d(i)) .AND. (press_c(l).GT.p1d(i+1)) ) THEN
386	ipres=i
387	ENDIF
388	ENDDO
389	factp = (press_c(l)-p1d(ipres)) / (p1d(ipres+1)-p1d(ipres))
390
391	nb(l) = exp( log(ct1d(ipres))(1-factp) + log(ct1d(ipres+1)) factp )
392	temp_c(l) = t1d(ipres)(1-factp) + t1d(ipres+1)factp
393	ENDDO
394
395	! We build altitude with hydrostatic equilibrium on preskim grid with Vervack profile
396	! ( keeping in mind that preskim is built based on Vervack profile with dz=10km )
397
398	DO l=klev+1,nlaykim_tot
399
400	! Compute geopotential on the upper grid with effective g to have correct altitudes
401	! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
402
403	temp1 = 0.5*(temp_c(l-1)+temp_c(l)) ! interlayer temp
404	phi_c(l) = phi_c(l-1) + rtemp1log(press_c(l-1)/press_c(l)) ! Geopotential assuming hydrostatic equilibrium
405
406	rmil(l) = ( gradrad / (g*rad - ( phi_c(l) + cpphis(ig) ) ) ) / 1000.0 ! z(phi) with g varying with altitude with reference to the geoid
407	ENDDO
408
409	DO l=klev+2,nlaykim_tot
410	rinter(l) = 0.5*(rmil(l-1) + rmil(l)) ! should be balanced with the intermediate pressure rather than 0.5
411	ENDDO
412
413	! 2. From krpd, compute krate for dissociations (declination-latitude-altitude interpolation)
414	! -------------------------------------------------------------------------------------------
415
416	! a. Calculate declination dependence
417
418	if ((declin_c*10+267).lt.14.) then
419	idec = 0
420	dec = 0
421	else
422	if ((declin_c*10+267).gt.520.) then
423	idec = 14
424	dec = 534
425	else
426	idec = 1
427	dec = 27
428	do while( (declin_c*10+267).ge.real(dec+20) )
429	dec = dec+40
430	idec = idec+1
431	enddo
432	endif
433	endif
434	if ((declin_c.ge.-24.).and.(declin_c.le.24.)) then
435	factdec = ( declin_c - (dec-267)/10. ) / 4.
436	else
437	factdec = ( declin_c - (dec-267)/10. ) / 2.7
438	endif
439
440	! b. Calculate klat for interpolation on fixed latitudes of actinic fluxes input
441
442	klat=1
443	DO i=1,nlat_actfluxes
444	IF (latitude(ig).LT.lat_actfluxes(i)) klat=i
445	ENDDO
446	IF (klat==nlat_actfluxes) THEN ! avoid rounding problems
447	klat = nlat_actfluxes-1
448	factlat = 1.0
449	ELSE
450	factlat = (latitude(ig)-lat_actfluxes(klat))/(lat_actfluxes(klat+1)-lat_actfluxes(klat))
451	ENDIF
452
453	! c. Altitude loop
454
455	DO l=1,nlaykim_tot
456
457	! Calculate ialt for interpolation in altitude (krpd every 2 km)
458	ialt = int((rmil(l)-rad/1000.)/2.)+1
459	factalt = (rmil(l)-rad/1000.)/2.-(ialt-1)
460
461	! Altitude can go above top limit of UV levels - in this case we keep the 1310km top fluxes
462	IF (ialt.GT.nlrt_kim-1) THEN
463	ialt = nlrt_kim-1 ! avoid out-of-bound array
464	factalt = 1.0
465	ENDIF
466
467	DO i=1,nd_kim+1 ! nd_kim+1 is dissociation of N2 by GCR
468
469	krpddec = ( krpd(i,ialt ,idec+1,klat) * (1.0-factalt) &
470	+ krpd(i,ialt+1,idec+1,klat) * factalt ) * (1.0-factlat) &
471	+ ( krpd(i,ialt ,idec+1,klat+1) * (1.0-factalt) &
472	+ krpd(i,ialt+1,idec+1,klat+1) * factalt ) * factlat
473
474	if ( factdec.lt.0. ) then
475	krpddecm1 = ( krpd(i,ialt ,idec ,klat) * (1.0-factalt) &
476	+ krpd(i,ialt+1,idec ,klat) * factalt ) * (1.0-factlat) &
477	+ ( krpd(i,ialt ,idec ,klat+1) * (1.0-factalt) &
478	+ krpd(i,ialt+1,idec ,klat+1) * factalt ) * factlat
479	krate(l,i) = krpddecm1 * abs(factdec) + krpddec * ( 1.0 + factdec)
480	else if ( factdec.gt.0. ) then
481	krpddecp1 = ( krpd(i,ialt ,idec+2,klat) * (1.0-factalt) &
482	+ krpd(i,ialt+1,idec+2,klat) * factalt ) * (1.0-factlat) &
483	+ ( krpd(i,ialt ,idec+2,klat+1) * (1.0-factalt) &
484	+ krpd(i,ialt+1,idec+2,klat+1) * factalt ) * factlat
485	krate(l,i) = krpddecp1 * factdec + krpddec * ( 1.0 - factdec)
486	else if ( factdec.eq.0. ) then
487	krate(l,i) = krpddec
488	endif
489
490	ENDDO ! i=1,nd_kim+1
491	ENDDO ! l=1,nlaykim_tot
492
493	! 3. Read composition
494	! -------------------
495
496	DO ic=1,nkim
497	DO l=1,klev
498	cqy(l,ic) = qy_c(ig,l,ic) ! advected tracers for the GCM part converted to molar frac.
499	ENDDO
500
501	DO l=1,nlaykim_up
502	cqy(klev+l,ic) = ykim_up(ic,ig,l) ! ykim_up for the upper atm.
503	ENDDO
504	ENDDO
505
506	cqy0(:,:) = cqy(:,:) ! Stores compo. before modifs
507
508	! 4. Call main Titan chemistry C routine
509	! --------------------------------------
510
511	call gptitan(rinter,temp_c,nb, &
512	nomqy_c,cqy, &
513	dtchim,latitude(ig)*180./pi,mass,md, &
514	kedd,krate,reactif, &
515	nom_prod,nom_perte,prod,perte, &
516	aerprod,utilaer,cmaer,cprodaer,ccsn,ccsh, &
517	htoh2,surfhaze)
518
519	! 5. Calculates tendencies on composition for advected tracers
520	! ------------------------------------------------------------
521	DO ic=1,nkim
522	DO l=1,klev
523	dqyc(ig,l,ic) = (cqy(l,ic) - cqy0(l,ic))/dtchim ! (mol/mol/s)
524	ENDDO
525	ENDDO
526
527	! 6. Update ykim_up
528	! -----------------
529	DO ic=1,nkim
530	DO l=1,nlaykim_up
531	ykim_up(ic,ig,l) = cqy(klev+l,ic)
532	ENDDO
533	ENDDO
534	! NB: The full vertical composition grid will be created only for the outputs
535
536	#ifndef MESOSCALE
537	ELSE ! In 2D chemistry, if following grid point at same latitude, same zonal mean so don't do calculations again !
538	dqyc(ig,:,:) = dqyc(igm1,:,:) ! will be put back in 3D with longitudinal variations assuming same relative tendencies within a lat band
539	ykim_up(:,ig,:) = ykim_up(:,igm1,:) ! no horizontal mixing in upper layers -> no longitudinal variations
540	ENDIF
541	#endif
542
543	ENDDO
544
545	END SUBROUTINE calchim

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