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initracer.F @ 1969

Last change on this file since 1969 was 1720, checked in by jaudouard, 7 years ago
Update on CO2 ice clouds scheme
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1	SUBROUTINE initracer(ngrid,nq,qsurf)
2
3	use tracer_mod
4	USE comcstfi_h
5	IMPLICIT NONE
6	c=======================================================================
7	c subject:
8	c --------
9	c Initialization related to tracer
10	c (transported dust, water, chemical species, ice...)
11	c
12	c Name of the tracer
13	c
14	c Test of dimension :
15	c Initialize tracer related data in tracer_mod, using tracer names provided
16	c by the dynamics in "infotrac"
17	c
18	c
19	c author: F.Forget
20	c ------
21	c Modifs: Franck Montmessin, Sebastien Lebonnois (june 2003)
22	c Ehouarn Millour (oct. 2008) identify tracers by their names
23	c=======================================================================
24
25
26	#include "callkeys.h"
27
28	integer,intent(in) :: ngrid ! number of atmospheric columns
29	integer,intent(in) :: nq ! number of tracers
30	real,intent(out) :: qsurf(ngrid,nq) ! tracer on surface (e.g. kg.m-2)
31
32	integer iq,ig,count
33	real r0_lift , reff_lift, nueff_lift
34	c Ratio of small over large dust particles (used when both
35	c doubleq and the submicron mode are active); In Montmessin
36	c et al. (2002), a value of 25 has been deduced;
37	real, parameter :: popratio = 25.
38	character(len=20) :: txt ! to store some text
39
40	c-----------------------------------------------------------------------
41	c radius(nq) ! aerosol particle radius (m)
42	c rho_q(nq) ! tracer densities (kg.m-3)
43	c alpha_lift(nq) ! saltation vertical flux/horiz flux ratio (m-1)
44	c alpha_devil(nq) ! lifting coeeficient by dust devil
45	c rho_dust ! Mars dust density
46	c rho_ice ! Water ice density
47	c nuice_ref ! Effective variance nueff of the
48	c ! water-ice size distributions
49	c doubleq ! if method with mass (iq=1) and number(iq=2) mixing ratio
50	c varian ! Characteristic variance of log-normal distribution
51	c-----------------------------------------------------------------------
52
53
54	c------------------------------------------------------------
55	c NAME and molar mass of the tracer
56	c------------------------------------------------------------
57
58	! Identify tracers by their names: (and set corresponding values of mmol)
59	! 0. initialize tracer indexes to zero:
60	igcm_dustbin(1:nq)=0
61	igcm_co2_ice=0
62	igcm_ccnco2_mass=0
63	igcm_ccnco2_number=0
64	igcm_dust_mass=0
65	igcm_dust_number=0
66	igcm_ccn_mass=0
67	igcm_ccn_number=0
68	igcm_dust_submicron=0
69	igcm_h2o_vap=0
70	igcm_h2o_ice=0
71	igcm_co2=0
72	igcm_co=0
73	igcm_o=0
74	igcm_o1d=0
75	igcm_o2=0
76	igcm_o3=0
77	igcm_h=0
78	igcm_h2=0
79	igcm_oh=0
80	igcm_ho2=0
81	igcm_h2o2=0
82	igcm_ch4=0
83	igcm_n2=0
84	igcm_ar=0
85	igcm_ar_n2=0
86	igcm_n=0
87	igcm_no=0
88	igcm_no2=0
89	igcm_n2d=0
90	igcm_he=0
91	igcm_co2plus=0
92	igcm_oplus=0
93	igcm_o2plus=0
94	igcm_coplus=0
95	igcm_cplus=0
96	igcm_nplus=0
97	igcm_noplus=0
98	igcm_n2plus=0
99	igcm_hplus=0
100	igcm_hco2plus=0
101	igcm_elec=0
102
103	! 1. find dust tracers
104	count=0
105	if (dustbin.gt.0) then
106	do iq=1,nq
107	txt=" "
108	write(txt,'(a4,i2.2)')'dust',count+1
109	if (noms(iq).eq.txt) then
110	count=count+1
111	igcm_dustbin(count)=iq
112	mmol(iq)=100.
113	endif
114	enddo !do iq=1,nq
115	endif ! of if (dustbin.gt.0)
116	if (doubleq) then
117	do iq=1,nq
118	if (noms(iq).eq."dust_mass") then
119	igcm_dust_mass=iq
120	count=count+1
121	endif
122	if (noms(iq).eq."dust_number") then
123	igcm_dust_number=iq
124	count=count+1
125	endif
126	enddo
127	endif ! of if (doubleq)
128	if (microphys) then
129	do iq=1,nq
130	if (noms(iq).eq."ccn_mass") then
131	igcm_ccn_mass=iq
132	count=count+1
133	endif
134	if (noms(iq).eq."ccn_number") then
135	igcm_ccn_number=iq
136	count=count+1
137	endif
138	enddo
139	endif ! of if (microphys)
140	if (submicron) then
141	do iq=1,nq
142	if (noms(iq).eq."dust_submicron") then
143	igcm_dust_submicron=iq
144	mmol(iq)=100.
145	count=count+1
146	endif
147	enddo
148	endif ! of if (submicron)
149	! 2. find chemistry and water tracers
150	do iq=1,nq
151	if (noms(iq).eq."co2") then
152	igcm_co2=iq
153	mmol(igcm_co2)=44.
154	count=count+1
155	endif
156	if (noms(iq).eq."co") then
157	igcm_co=iq
158	mmol(igcm_co)=28.
159	count=count+1
160	endif
161	if (noms(iq).eq."o") then
162	igcm_o=iq
163	mmol(igcm_o)=16.
164	count=count+1
165	endif
166	if (noms(iq).eq."o1d") then
167	igcm_o1d=iq
168	mmol(igcm_o1d)=16.
169	count=count+1
170	endif
171	if (noms(iq).eq."o2") then
172	igcm_o2=iq
173	mmol(igcm_o2)=32.
174	count=count+1
175	endif
176	if (noms(iq).eq."o3") then
177	igcm_o3=iq
178	mmol(igcm_o3)=48.
179	count=count+1
180	endif
181	if (noms(iq).eq."h") then
182	igcm_h=iq
183	mmol(igcm_h)=1.
184	count=count+1
185	endif
186	if (noms(iq).eq."h2") then
187	igcm_h2=iq
188	mmol(igcm_h2)=2.
189	count=count+1
190	endif
191	if (noms(iq).eq."oh") then
192	igcm_oh=iq
193	mmol(igcm_oh)=17.
194	count=count+1
195	endif
196	if (noms(iq).eq."ho2") then
197	igcm_ho2=iq
198	mmol(igcm_ho2)=33.
199	count=count+1
200	endif
201	if (noms(iq).eq."h2o2") then
202	igcm_h2o2=iq
203	mmol(igcm_h2o2)=34.
204	count=count+1
205	endif
206	if (noms(iq).eq."n2") then
207	igcm_n2=iq
208	mmol(igcm_n2)=28.
209	count=count+1
210	endif
211	if (noms(iq).eq."ch4") then
212	igcm_ch4=iq
213	mmol(igcm_ch4)=16.
214	count=count+1
215	endif
216	if (noms(iq).eq."ar") then
217	igcm_ar=iq
218	mmol(igcm_ar)=40.
219	count=count+1
220	endif
221	if (noms(iq).eq."n") then
222	igcm_n=iq
223	mmol(igcm_n)=14.
224	count=count+1
225	endif
226	if (noms(iq).eq."no") then
227	igcm_no=iq
228	mmol(igcm_no)=30.
229	count=count+1
230	endif
231	if (noms(iq).eq."no2") then
232	igcm_no2=iq
233	mmol(igcm_no2)=46.
234	count=count+1
235	endif
236	if (noms(iq).eq."n2d") then
237	igcm_n2d=iq
238	mmol(igcm_n2d)=28.
239	count=count+1
240	endif
241	if (noms(iq).eq."he") then
242	igcm_he=iq
243	mmol(igcm_he)=4.
244	count=count+1
245	endif
246	if (noms(iq).eq."co2plus") then
247	igcm_co2plus=iq
248	mmol(igcm_co2plus)=44.
249	count=count+1
250	endif
251	if (noms(iq).eq."oplus") then
252	igcm_oplus=iq
253	mmol(igcm_oplus)=16.
254	count=count+1
255	endif
256	if (noms(iq).eq."o2plus") then
257	igcm_o2plus=iq
258	mmol(igcm_o2plus)=32.
259	count=count+1
260	endif
261	if (noms(iq).eq."coplus") then
262	igcm_coplus=iq
263	mmol(igcm_coplus)=28.
264	count=count+1
265	endif
266	if (noms(iq).eq."cplus") then
267	igcm_cplus=iq
268	mmol(igcm_cplus)=12.
269	count=count+1
270	endif
271	if (noms(iq).eq."nplus") then
272	igcm_nplus=iq
273	mmol(igcm_nplus)=14.
274	count=count+1
275	endif
276	if (noms(iq).eq."noplus") then
277	igcm_noplus=iq
278	mmol(igcm_noplus)=30.
279	count=count+1
280	endif
281	if (noms(iq).eq."n2plus") then
282	igcm_n2plus=iq
283	mmol(igcm_n2plus)=28.
284	count=count+1
285	endif
286	if (noms(iq).eq."hplus") then
287	igcm_hplus=iq
288	mmol(igcm_hplus)=1.
289	count=count+1
290	endif
291	if (noms(iq).eq."hco2plus") then
292	igcm_hco2plus=iq
293	mmol(igcm_hco2plus)=45.
294	count=count+1
295	endif
296	if (noms(iq).eq."elec") then
297	igcm_elec=iq
298	mmol(igcm_elec)=1./1822.89
299	count=count+1
300	endif
301	if (noms(iq).eq."h2o_vap") then
302	igcm_h2o_vap=iq
303	mmol(igcm_h2o_vap)=18.
304	count=count+1
305	endif
306	if (noms(iq).eq."co2_ice") then
307	igcm_co2_ice=iq
308	mmol(igcm_co2_ice)=44.
309	count=count+1
310	endif
311	if (noms(iq).eq."h2o_ice") then
312	igcm_h2o_ice=iq
313	mmol(igcm_h2o_ice)=18.
314	count=count+1
315	endif
316	! Other stuff: e.g. for simulations using co2 + neutral gaz
317	if (noms(iq).eq."Ar_N2") then
318	igcm_ar_n2=iq
319	mmol(igcm_ar_n2)=30.
320	count=count+1
321	endif
322	if (co2clouds) then
323	if (noms(iq).eq."ccnco2_mass") then
324	igcm_ccnco2_mass=iq
325	count=count+1
326	endif
327	if (noms(iq).eq."ccnco2_number") then
328	igcm_ccnco2_number=iq
329	count=count+1
330	endif
331	endif
332	enddo ! of do iq=1,nq
333
334	! check that we identified all tracers:
335	if (count.ne.nq) then
336	write(,) "initracer: found only ",count," tracers"
337	write(,) " expected ",nq
338	do iq=1,count
339	write(,)' ',iq,' ',trim(noms(iq))
340	enddo
341	stop
342	else
343	write(,) "initracer: found all expected tracers, namely:"
344	do iq=1,nq
345	write(,)' ',iq,' ',trim(noms(iq))
346	enddo
347	endif
348
349	! if water cycle but iceparty=.false., there will nevertheless be
350	! water ice at the surface (iceparty is not used anymore, but this
351	! part is still relevant, as we want to stay compatible with the
352	! older versions).
353	if (water.and.(igcm_h2o_ice.eq.0)) then
354	igcm_h2o_ice=igcm_h2o_vap ! so that qsurf(i_h2o_ice) is identified
355	! even though there is no q(i_h2o_ice)
356	else
357	! surface ice qsurf(i_h2o_ice) was loaded twice by phyetat0,
358	! as qsurf(i_h2o_vap) & as qsurf(i_h2o_ice), so to be clean:
359	if (igcm_h2o_vap.ne.0) then
360	qsurf(1:ngrid,igcm_h2o_vap)=0
361	endif
362	endif
363
364	c------------------------------------------------------------
365	c Initialize tracers .... (in tracer_mod)
366	c------------------------------------------------------------
367	! start by setting everything to (default) zero
368	rho_q(1:nq)=0 ! tracer density (kg.m-3)
369	radius(1:nq)=0. ! tracer particle radius (m)
370	alpha_lift(1:nq) =0. ! tracer saltation vertical flux/horiz flux ratio (m-1)
371	alpha_devil(1:nq)=0. ! tracer lifting coefficient by dust devils
372
373
374	! some reference values
375	rho_dust=2500. ! Mars dust density (kg.m-3)
376	rho_ice=920. ! Water ice density (kg.m-3)
377	rho_ice_co2=1650.
378	!Mangan et al., Icarus 2017 :CO2 density = 1.72391-2.53×10−4T – 2.87×10−6T^2
379	nuice_ref=0.1 ! Effective variance nueff of the
380	! water-ice size distribution
381	!!!nuice_sed=0.45 ! Sedimentation effective variance
382	! of the water-ice size distribution
383
384	if (doubleq) then
385	c "doubleq" technique
386	c -------------------
387	c (transport of mass and number mixing ratio)
388	c iq=1: Q mass mixing ratio, iq=2: N number mixing ratio
389
390	if( (nq.lt.2).or.(water.and.(nq.lt.4)) ) then
391	write(,)'initracer: nq is too low : nq=', nq
392	write(,)'water= ',water,' doubleq= ',doubleq
393	end if
394
395	nueff_lift = 0.5
396	varian=sqrt(log(1.+nueff_lift))
397
398	rho_q(igcm_dust_mass)=rho_dust
399	rho_q(igcm_dust_number)=rho_dust
400
401	c Intermediate calcul for computing geometric mean radius r0
402	c as a function of mass and number mixing ratio Q and N
403	c (r0 = (r3n_q * Q/ N)^(1/3))
404	r3n_q = exp(-4.5varian2)(3./4.)/(pi*rho_dust)
405
406	c Intermediate calcul for computing effective radius reff
407	c from geometric mean radius r0
408	c (reff = ref_r0 * r0)
409	ref_r0 = exp(2.5varian*2)
410
411	c lifted dust :
412	c '''''''''''
413	reff_lift = 3.0e-6 !3.e-6 !Effective radius of lifted dust (m)
414	alpha_devil(igcm_dust_mass)=9.e-9 ! dust devil lift mass coeff
415	c alpha_lift(igcm_dust_mass)=3.0e-15 ! Lifted mass coeff
416
417	!! default lifting settings
418	!! -- GCM: alpha_lift not zero because large-scale lifting by default
419	!! -- MESOSCALE: alpha_lift zero because no lifting at all in mesoscale by default
420	#ifdef MESOSCALE
421	alpha_lift(igcm_dust_mass)=0.0
422	#else
423	alpha_lift(igcm_dust_mass)=1.e-6 !1.e-6 !Lifted mass coeff
424	#endif
425
426	r0_lift = reff_lift/ref_r0
427	alpha_devil(igcm_dust_number)=r3n_q*
428	& alpha_devil(igcm_dust_mass)/r0_lift**3
429	alpha_lift(igcm_dust_number)=r3n_q*
430	& alpha_lift(igcm_dust_mass)/r0_lift**3
431
432	radius(igcm_dust_mass) = reff_lift
433	radius(igcm_dust_number) = reff_lift
434
435	write(,) "initracer: doubleq_param reff_lift:", reff_lift
436	write(,) "initracer: doubleq_param nueff_lift:", nueff_lift
437	write(,) "initracer: doubleq_param alpha_lift:",
438	& alpha_lift(igcm_dust_mass)
439	else
440
441	! initialize varian, which may be used (e.g. by surfacearea)
442	! even with conrath dust
443	nueff_lift = 0.5
444	varian=sqrt(log(1.+nueff_lift))
445
446	if (dustbin.gt.1) then
447	print*,'initracer: STOP!',
448	$ ' properties of dust need to be set in initracer !!!'
449	stop
450
451	else if (dustbin.eq.1) then
452
453	c This will be used for 1 dust particle size:
454	c ------------------------------------------
455	radius(igcm_dustbin(1))=3.e-6
456	alpha_lift(igcm_dustbin(1))=0.0e-6
457	alpha_devil(igcm_dustbin(1))=7.65e-9
458	rho_q(igcm_dustbin(1))=rho_dust
459
460	endif
461	end if ! (doubleq)
462
463
464	c Scavenging of dust particles by H2O clouds:
465	c ------------------------------------------
466	c Initialize the two tracers used for the CCNs
467	if (water.AND.doubleq.AND.scavenging) then
468	radius(igcm_ccn_mass) = radius(igcm_dust_mass)
469	alpha_lift(igcm_ccn_mass) = 1e-30
470	alpha_devil(igcm_ccn_mass) = 1e-30
471	rho_q(igcm_ccn_mass) = rho_dust
472
473	radius(igcm_ccn_number) = radius(igcm_ccn_mass)
474	alpha_lift(igcm_ccn_number) = alpha_lift(igcm_ccn_mass)
475	alpha_devil(igcm_ccn_number) = alpha_devil(igcm_ccn_mass)
476	rho_q(igcm_ccn_number) = rho_q(igcm_ccn_mass)
477	endif ! of if (water.AND.doubleq.AND.scavenging)
478
479	c Submicron dust mode:
480	c --------------------
481
482	if (submicron) then
483	radius(igcm_dust_submicron)=0.1e-6
484	rho_q(igcm_dust_submicron)=rho_dust
485	if (doubleq) then
486	c If doubleq is also active, we use the population ratio:
487	alpha_lift(igcm_dust_submicron) =
488	& alpha_lift(igcm_dust_number)popratio
489	& rho_q(igcm_dust_submicron)4./3.pi*
490	& radius(igcm_dust_submicron)**3.
491	alpha_devil(igcm_dust_submicron)=1.e-30
492	else
493	alpha_lift(igcm_dust_submicron)=1e-6
494	alpha_devil(igcm_dust_submicron)=1.e-30
495	endif ! (doubleq)
496	end if ! (submicron)
497
498	c Initialization for water vapor
499	c ------------------------------
500	if(water) then
501	radius(igcm_h2o_vap)=0.
502	alpha_lift(igcm_h2o_vap) =0.
503	alpha_devil(igcm_h2o_vap)=0.
504	if(water.and.(nq.ge.2)) then
505	radius(igcm_h2o_ice)=3.e-6
506	rho_q(igcm_h2o_ice)=rho_ice
507	alpha_lift(igcm_h2o_ice) =0.
508	alpha_devil(igcm_h2o_ice)=0.
509	elseif(water.and.(nq.lt.2)) then
510	write(,) 'nq is too low : nq=', nq
511	write(,) 'water= ',water
512	endif
513
514	end if ! (water)
515
516	! Initialisation for CO2 clouds
517	if (co2clouds ) then
518	radius(igcm_ccnco2_mass) = radius(igcm_dust_mass)
519	alpha_lift(igcm_ccnco2_mass) = 1e-30
520	alpha_devil(igcm_ccnco2_mass) = 1e-30
521	rho_q(igcm_ccnco2_mass) = rho_dust
522	radius(igcm_ccnco2_number) = radius(igcm_ccnco2_mass)
523	alpha_lift(igcm_ccnco2_number) = alpha_lift(igcm_ccnco2_mass)
524	alpha_devil(igcm_ccnco2_number) = alpha_devil(igcm_ccnco2_mass)
525	rho_q(igcm_ccnco2_number) = rho_q(igcm_ccnco2_mass)
526
527	radius(igcm_co2)=0.
528	alpha_lift(igcm_co2) =0.
529	alpha_devil(igcm_co2)=0.
530	radius(igcm_co2_ice)=1.e-8
531	rho_q(igcm_co2_ice)=rho_ice_co2
532	alpha_lift(igcm_co2_ice) =0.
533	alpha_devil(igcm_co2_ice)=0.
534
535	endif
536
537	c Output for records:
538	c ~~~~~~~~~~~~~~~~~~
539	write(,)
540	Write(,) '******** initracer : dust transport parameters :'
541	write(,) 'alpha_lift = ', alpha_lift
542	write(,) 'alpha_devil = ', alpha_devil
543	write(,) 'radius = ', radius
544	if(doubleq) then
545	write(,) 'reff_lift (um) = ', reff_lift
546	write(,) 'size distribution variance = ', varian
547	write(,) 'r3n_q , ref_r0 : ', r3n_q , ref_r0
548	end if
549
550	!
551	! some extra (possibly redundant) sanity checks for tracers:
552	! ---------------------------------------------------------
553
554	if (doubleq) then
555	! verify that we indeed have dust_mass and dust_number tracers
556	if (igcm_dust_mass.eq.0) then
557	write(,) "initracer: error !!"
558	write(,) " cannot use doubleq option without ",
559	& "a dust_mass tracer !"
560	stop
561	endif
562	if (igcm_dust_number.eq.0) then
563	write(,) "initracer: error !!"
564	write(,) " cannot use doubleq option without ",
565	& "a dust_number tracer !"
566	stop
567	endif
568	endif
569
570	if ((.not.doubleq).and.(dustbin.gt.0)) then
571	! verify that we indeed have 'dustbin' dust tracers
572	count=0
573	do iq=1,dustbin
574	if (igcm_dustbin(iq).ne.0) then
575	count=count+1
576	endif
577	enddo
578	if (count.ne.dustbin) then
579	write(,) "initracer: error !!"
580	write(,) " dusbin is set to ",dustbin,
581	& " but we only have the following dust tracers:"
582	do iq=1,count
583	write(,)" ",trim(noms(igcm_dustbin(iq)))
584	enddo
585	stop
586	endif
587	endif
588
589	if (water) then
590	! verify that we indeed have h2o_vap and h2o_ice tracers
591	if (igcm_h2o_vap.eq.0) then
592	write(,) "initracer: error !!"
593	write(,) " cannot use water option without ",
594	& "an h2o_vap tracer !"
595	stop
596	endif
597	if (igcm_h2o_ice.eq.0) then
598	write(,) "initracer: error !!"
599	write(,) " cannot use water option without ",
600	& "an h2o_ice tracer !"
601	stop
602	endif
603	endif
604
605	if (co2clouds) then
606	!verify that we have co2_ice and co2 tracers
607	if (igcm_co2 .eq. 0) then
608	write(,) "initracer: error !!"
609	write(,) " cannot use co2 clouds option without ",
610	& "a co2 tracer !"
611	stop
612	endif
613	if (igcm_co2_ice .eq. 0) then
614	write(,) "initracer: error !!"
615	write(,) " cannot use co2 clouds option without ",
616	& "a co2_ice tracer !"
617	stop
618	endif
619	endif
620
621	if (callnlte) then ! NLTE requirements
622	if (nltemodel.ge.1) then
623	! check that co2, co, o and n2 tracers are available
624	if (igcm_co2.eq.0) then
625	write(,) "initracer: error !!"
626	write(,) " with nltemodel>0, we need the co2 tracer!"
627	stop
628	endif
629	if (igcm_co.eq.0) then
630	write(,) "initracer: error !!"
631	write(,) " with nltemodel>0, we need the co tracer!"
632	stop
633	endif
634	if (igcm_o.eq.0) then
635	write(,) "initracer: error !!"
636	write(,) " with nltemodel>0, we need the o tracer!"
637	stop
638	endif
639	if (igcm_n2.eq.0) then
640	write(,) "initracer: error !!"
641	write(,) " with nltemodel>0, we need the n2 tracer!"
642	stop
643	endif
644	endif
645	endif
646
647	if (scavenging) then
648	! verify that we indeed have ccn_mass and ccn_number tracers
649	if (igcm_ccn_mass.eq.0 .and. igcm_ccnco2_mass.eq.0) then
650	write(,) "initracer: error !!"
651	write(,) " cannot use scavenging option without ",
652	& "a ccn_mass or ccnco2_mass tracer !"
653	stop
654	endif
655	if (igcm_ccn_number.eq.0 .and. igcm_ccnco2_number.eq.0 ) then
656	write(,) "initracer: error !!"
657	write(,) " cannot use scavenging option without ",
658	& "a ccn_number or ccnco2_number tracer !"
659	stop
660	endif
661	endif ! of if (scavenging)
662
663	if (photochem .or. callthermos) then
664	! verify that we indeed have the chemistry tracers
665	if (igcm_co2.eq.0) then
666	write(,) "initracer: error !!"
667	write(,) " cannot use chemistry option without ",
668	& "a co2 tracer !"
669	stop
670	endif
671	if (igcm_co.eq.0) then
672	write(,) "initracer: error !!"
673	write(,) " cannot use chemistry option without ",
674	& "a co tracer !"
675	stop
676	endif
677	if (igcm_o.eq.0) then
678	write(,) "initracer: error !!"
679	write(,) " cannot use chemistry option without ",
680	& "a o tracer !"
681	stop
682	endif
683	if (igcm_o1d.eq.0) then
684	write(,) "initracer: error !!"
685	write(,) " cannot use chemistry option without ",
686	& "a o1d tracer !"
687	stop
688	endif
689	if (igcm_o2.eq.0) then
690	write(,) "initracer: error !!"
691	write(,) " cannot use chemistry option without ",
692	& "an o2 tracer !"
693	stop
694	endif
695	if (igcm_o3.eq.0) then
696	write(,) "initracer: error !!"
697	write(,) " cannot use chemistry option without ",
698	& "an o3 tracer !"
699	stop
700	endif
701	if (igcm_h.eq.0) then
702	write(,) "initracer: error !!"
703	write(,) " cannot use chemistry option without ",
704	& "a h tracer !"
705	stop
706	endif
707	if (igcm_h2.eq.0) then
708	write(,) "initracer: error !!"
709	write(,) " cannot use chemistry option without ",
710	& "a h2 tracer !"
711	stop
712	endif
713	if (igcm_oh.eq.0) then
714	write(,) "initracer: error !!"
715	write(,) " cannot use chemistry option without ",
716	& "an oh tracer !"
717	stop
718	endif
719	if (igcm_ho2.eq.0) then
720	write(,) "initracer: error !!"
721	write(,) " cannot use chemistry option without ",
722	& "a ho2 tracer !"
723	stop
724	endif
725	if (igcm_h2o2.eq.0) then
726	write(,) "initracer: error !!"
727	write(,) " cannot use chemistry option without ",
728	& "a h2o2 tracer !"
729	stop
730	endif
731	if (igcm_n2.eq.0) then
732	write(,) "initracer: error !!"
733	write(,) " cannot use chemistry option without ",
734	& "a n2 tracer !"
735	stop
736	endif
737	if (igcm_ar.eq.0) then
738	write(,) "initracer: error !!"
739	write(,) " cannot use chemistry option without ",
740	& "an ar tracer !"
741	stop
742	endif
743	endif ! of if (photochem .or. callthermos)
744
745	end

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