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initracer.F @ 342

Last change on this file since 342 was 324, checked in by aslmd, 14 years ago

MESOSCALE : Preparatory commit for the ultimate option mars=42 which

would allow mesoscale modeling with photochemistry.

[see r76 method to add 'mars' options]
Modified module_lmd_driver.F and Registry.EM and runmeso
Modified readmeteo.F90 and introduced an option -DPHOTOCHEM
...
Transparent to the casual user
Option mars=42 not yet finished though -- so do not use!

File size: 23.5 KB

Line
1	SUBROUTINE initracer(qsurf,co2ice)
2
3	IMPLICIT NONE
4	c=======================================================================
5	c subject:
6	c --------
7	c Initialization related to tracer
8	c (transported dust, water, chemical species, ice...)
9	c
10	c Name of the tracer
11	c
12	c Test of dimension :
13	c Initialize COMMON tracer in tracer.h, using tracer names provided
14	c by the dynamics in "advtrac.h"
15	c
16	c Old conventions: (not used any more)
17	c
18	c If water=T : q(iq=nqmx) is the water mass mixing ratio
19	c and q(iq=nqmx-1) is the ice mass mixing ratio
20
21	c If there is transported dust, it uses iq=1 to iq=dustbin
22	c If there is no transported dust : dustbin=0
23	c If doubleq=T : q(iq=1) is the dust mass mixing ratio
24	c q(iq=2) is the dust number mixing ratio
25
26	c If (photochem.or.thermochem) there is "ncomp" chemical species (ncomp
27	c is set in aeronomars/chimiedata.h) using the ncomp iq values starting at
28	c iq=nqchem_min = dustbin+1 (nqchem_min is defined in inifis.F)
29	c
30	c
31	c author: F.Forget
32	c ------
33	c Modifs: Franck Montmessin, Sebastien Lebonnois (june 2003)
34	c Ehouarn Millour (oct. 2008) identify tracers by their names
35	c=======================================================================
36
37
38	#include "dimensions.h"
39	#include "dimphys.h"
40	#include "comcstfi.h"
41	#include "callkeys.h"
42	#include "tracer.h"
43	#include "advtrac.h"
44	#include "comgeomfi.h"
45	#include "chimiedata.h"
46
47	#include "surfdat.h"
48
49	real qsurf(ngridmx,nqmx) ! tracer on surface (e.g. kg.m-2)
50	real co2ice(ngridmx) ! co2 ice mass on surface (e.g. kg.m-2)
51	integer iq,ig,count
52	real r0_lift , reff_lift, nueff_lift
53	c Ratio of small over large dust particles (used when both
54	c doubleq and the submicron mode are active); In Montmessin
55	c et al. (2002), a value of 25 has been deduced;
56	real, parameter :: popratio = 25.
57	logical :: oldnames ! =.true. if old tracer naming convention (q01,...)
58	character(len=20) :: txt ! to store some text
59
60	c-----------------------------------------------------------------------
61	c radius(nqmx) ! aerosol particle radius (m)
62	c rho_q(nqmx) ! tracer densities (kg.m-3)
63	c alpha_lift(nqmx) ! saltation vertical flux/horiz flux ratio (m-1)
64	c alpha_devil(nqmx) ! lifting coeeficient by dust devil
65	c rho_dust ! Mars dust density
66	c rho_ice ! Water ice density
67	c nuice_ref ! Effective variance nueff of the
68	c ! water-ice size distributions
69	c doubleq ! if method with mass (iq=1) and number(iq=2) mixing ratio
70	c varian ! Characteristic variance of log-normal distribution
71	c-----------------------------------------------------------------------
72
73	integer :: nqchem_start
74
75	! Initialization: get tracer names from the dynamics and check if we are
76	! using 'old' tracer convention ('q01',q02',...)
77	! or new convention (full tracer names)
78	! check if tracers have 'old' names
79	oldnames=.false.
80	count=0
81	do iq=1,nqmx
82	txt=" "
83	write(txt,'(a1,i2.2)') 'q',iq
84	if (txt.eq.tnom(iq)) then
85	count=count+1
86	endif
87	enddo ! of do iq=1,nqmx
88
89	if (count.eq.nqmx) then
90	write(,) "initracer: tracers seem to follow old naming ",
91	& "convention (q01,q02,...)"
92	write(,) " => will work for now ... "
93	write(,) " but you should run newstart to rename them"
94	oldnames=.true.
95	endif
96
97	! copy/set tracer names
98	if (oldnames) then ! old names (derived from iq & option values)
99	! 1. dust:
100	if (dustbin.ne.0) then ! transported dust
101	do iq=1,dustbin
102	txt=" "
103	write(txt,'(a4,i2.2)') 'dust',iq
104	noms(iq)=txt
105	mmol(iq)=100.
106	enddo
107	! special case if doubleq
108	if (doubleq) then
109	if (dustbin.ne.2) then
110	write(,) 'initracer: error expected dustbin=2'
111	else
112	! noms(1)='dust_mass' ! dust mass mixing ratio
113	! noms(2)='dust_number' ! dust number mixing ratio
114	! same as above, but avoid explict possible out-of-bounds on array
115	noms(1)='dust_mass' ! dust mass mixing ratio
116	do iq=2,2
117	noms(iq)='dust_number' ! dust number mixing ratio
118	enddo
119	endif
120	endif
121	endif
122	! 2. water & ice
123	if (water) then
124	noms(nqmx)='h2o_vap'
125	mmol(nqmx)=18.
126	! noms(nqmx-1)='h2o_ice'
127	! mmol(nqmx-1)=18.
128	!"loop" to avoid potential out-of-bounds in array
129	do iq=nqmx-1,nqmx-1
130	noms(iq)='h2o_ice'
131	mmol(iq)=18.
132	enddo
133	endif
134	! 3. Chemistry
135	if (photochem .or. callthermos) then
136	if (doubleq) then
137	nqchem_start=3
138	else
139	nqchem_start=dustbin+1
140	end if
141	do iq=nqchem_start,nqchem_start+ncomp-1
142	noms(iq)=nomchem(iq-nqchem_start+1)
143	mmol(iq)=mmolchem(iq-nqchem_start+1)
144	enddo
145	endif ! of if (photochem .or. callthermos)
146	! 4. Other tracers ????
147	if ((dustbin.eq.0).and.(.not.water)) then
148	noms(1)='co2'
149	mmol(1)=44
150	if (nqmx.eq.2) then
151	noms(nqmx)='Ar_N2'
152	mmol(nqmx)=30
153	endif
154	endif
155	else
156	! copy tracer names from dynamics
157	do iq=1,nqmx
158	noms(iq)=tnom(iq)
159	enddo
160	! mmol(:) array is initialized later (see below)
161	endif ! of if (oldnames)
162
163	! special modification when using 'old' tracers:
164	! qsurf(nqmx) was h2o ice whereas q(nqmx) was water vapour
165	! and (if iceparty) q(nqmx-1) was null whereas q(nqmx-1) was water ice
166	if (oldnames.and.water) then
167	write(,)'initracer: moving surface water ice to index ',nqmx-1
168	! "loop" to avoid potential out-of-bounds on arrays
169	do iq=nqmx-1,nqmx-1
170	qsurf(1:ngridmx,iq)=qsurf(1:ngridmx,iq+1)
171	enddo
172	qsurf(1:ngridmx,nqmx)=0
173	endif
174
175	c------------------------------------------------------------
176	c Test Dimensions tracers
177	c------------------------------------------------------------
178
179	! Ehouarn: testing number of tracers is obsolete...
180	! if(photochem.or.thermochem) then
181	! if (water) then
182	! if ((dustbin+ncomp+2).ne.nqmx) then
183	! print*,'initracer: tracer dimension problem:'
184	! print*,"(dustbin+ncomp+2).ne.nqmx"
185	! print*,"ncomp: ",ncomp
186	! print*,"dustbin: ",dustbin
187	! print*,"nqmx: ",nqmx
188	! print*,'Change ncomp in chimiedata.h'
189	! endif
190	! else
191	! if ((dustbin+ncomp+1).ne.nqmx) then
192	! print*,'initracer: tracer dimension problem:'
193	! print*,"(dustbin+ncomp+1).ne.nqmx"
194	! print*,"ncomp: ",ncomp
195	! print*,"dustbin: ",dustbin
196	! print*,"nqmx: ",nqmx
197	! print*,'Change ncomp in chimiedata.h'
198	! STOP
199	! endif
200	! endif
201	! endif
202
203	c------------------------------------------------------------
204	c NAME and molar mass of the tracer
205	c------------------------------------------------------------
206
207
208	! Identify tracers by their names: (and set corresponding values of mmol)
209	! 0. initialize tracer indexes to zero:
210	do iq=1,nqmx
211	igcm_dustbin(iq)=0
212	enddo
213	igcm_dust_mass=0
214	igcm_dust_number=0
215	igcm_dust_submicron=0
216	igcm_h2o_vap=0
217	igcm_h2o_ice=0
218	igcm_co2=0
219	igcm_co=0
220	igcm_o=0
221	igcm_o1d=0
222	igcm_o2=0
223	igcm_o3=0
224	igcm_h=0
225	igcm_h2=0
226	igcm_oh=0
227	igcm_ho2=0
228	igcm_h2o2=0
229	igcm_n2=0
230	igcm_ar=0
231	igcm_ar_n2=0
232	igcm_n=0
233	igcm_no=0
234	igcm_no2=0
235	igcm_n2d=0
236	igcm_co2plus=0
237	igcm_oplus=0
238	igcm_o2plus=0
239	igcm_coplus=0
240	igcm_cplus=0
241	igcm_nplus=0
242	igcm_noplus=0
243	igcm_n2plus=0
244	igcm_hplus=0
245	igcm_elec=0
246
247
248	! 1. find dust tracers
249	count=0
250	if (dustbin.gt.0) then
251	do iq=1,nqmx
252	txt=" "
253	write(txt,'(a4,i2.2)')'dust',count+1
254	if (noms(iq).eq.txt) then
255	count=count+1
256	igcm_dustbin(count)=iq
257	mmol(iq)=100.
258	endif
259	enddo !do iq=1,nqmx
260	endif ! of if (dustbin.gt.0)
261	if (doubleq) then
262	do iq=1,nqmx
263	if (noms(iq).eq."dust_mass") then
264	igcm_dust_mass=iq
265	count=count+1
266	endif
267	if (noms(iq).eq."dust_number") then
268	igcm_dust_number=iq
269	count=count+1
270	endif
271	enddo
272	endif ! of if (doubleq)
273	if (submicron) then
274	do iq=1,nqmx
275	if (noms(iq).eq."dust_submicron") then
276	igcm_dust_submicron=iq
277	mmol(iq)=100.
278	count=count+1
279	endif
280	enddo
281	endif ! of if (submicron)
282	! 2. find chemistry and water tracers
283	do iq=1,nqmx
284	if (noms(iq).eq."co2") then
285	igcm_co2=iq
286	mmol(igcm_co2)=44.
287	count=count+1
288	endif
289	if (noms(iq).eq."co") then
290	igcm_co=iq
291	mmol(igcm_co)=28.
292	count=count+1
293	endif
294	if (noms(iq).eq."o") then
295	igcm_o=iq
296	mmol(igcm_o)=16.
297	count=count+1
298	endif
299	if (noms(iq).eq."o1d") then
300	igcm_o1d=iq
301	mmol(igcm_o1d)=16.
302	count=count+1
303	endif
304	if (noms(iq).eq."o2") then
305	igcm_o2=iq
306	mmol(igcm_o2)=32.
307	count=count+1
308	endif
309	if (noms(iq).eq."o3") then
310	igcm_o3=iq
311	mmol(igcm_o3)=48.
312	count=count+1
313	endif
314	if (noms(iq).eq."h") then
315	igcm_h=iq
316	mmol(igcm_h)=1.
317	count=count+1
318	endif
319	if (noms(iq).eq."h2") then
320	igcm_h2=iq
321	mmol(igcm_h2)=2.
322	count=count+1
323	endif
324	if (noms(iq).eq."oh") then
325	igcm_oh=iq
326	mmol(igcm_oh)=17.
327	count=count+1
328	endif
329	if (noms(iq).eq."ho2") then
330	igcm_ho2=iq
331	mmol(igcm_ho2)=33.
332	count=count+1
333	endif
334	if (noms(iq).eq."h2o2") then
335	igcm_h2o2=iq
336	mmol(igcm_h2o2)=34.
337	count=count+1
338	endif
339	if (noms(iq).eq."n2") then
340	igcm_n2=iq
341	mmol(igcm_n2)=28.
342	count=count+1
343	endif
344	if (noms(iq).eq."ch4") then
345	igcm_ch4=iq
346	mmol(igcm_ch4)=16.
347	count=count+1
348	endif
349	if (noms(iq).eq."ar") then
350	igcm_ar=iq
351	mmol(igcm_ar)=40.
352	count=count+1
353	endif
354	if (noms(iq).eq."n") then
355	igcm_n=iq
356	mmol(igcm_n)=14.
357	count=count+1
358	endif
359	if (noms(iq).eq."no") then
360	igcm_no=iq
361	mmol(igcm_no)=30.
362	count=count+1
363	endif
364	if (noms(iq).eq."no2") then
365	igcm_no2=iq
366	mmol(igcm_no2)=46.
367	count=count+1
368	endif
369	if (noms(iq).eq."n2d") then
370	igcm_n2d=iq
371	mmol(igcm_n2d)=28.
372	count=count+1
373	endif
374	if (noms(iq).eq."co2plus") then
375	igcm_co2plus=iq
376	mmol(igcm_co2plus)=44.
377	count=count+1
378	endif
379	if (noms(iq).eq."oplus") then
380	igcm_oplus=iq
381	mmol(igcm_oplus)=16.
382	count=count+1
383	endif
384	if (noms(iq).eq."o2plus") then
385	igcm_o2plus=iq
386	mmol(igcm_o2plus)=32.
387	count=count+1
388	endif
389	if (noms(iq).eq."coplus") then
390	igcm_coplus=iq
391	mmol(igcm_coplus)=28.
392	count=count+1
393	endif
394	if (noms(iq).eq."cplus") then
395	igcm_cplus=iq
396	mmol(igcm_cplus)=12.
397	count=count+1
398	endif
399	if (noms(iq).eq."nplus") then
400	igcm_nplus=iq
401	mmol(igcm_nplus)=14.
402	count=count+1
403	endif
404	if (noms(iq).eq."noplus") then
405	igcm_noplus=iq
406	mmol(igcm_noplus)=30.
407	count=count+1
408	endif
409	if (noms(iq).eq."n2plus") then
410	igcm_n2plus=iq
411	mmol(igcm_n2plus)=28.
412	count=count+1
413	endif
414	if (noms(iq).eq."hplus") then
415	igcm_hplus=iq
416	mmol(igcm_hplus)=1.
417	count=count+1
418	endif
419	if (noms(iq).eq."elec") then
420	igcm_elec=iq
421	mmol(igcm_elec)=1./1822.89
422	count=count+1
423	endif
424	if (noms(iq).eq."h2o_vap") then
425	igcm_h2o_vap=iq
426	mmol(igcm_h2o_vap)=18.
427	count=count+1
428	endif
429	if (noms(iq).eq."h2o_ice") then
430	igcm_h2o_ice=iq
431	mmol(igcm_h2o_ice)=18.
432	count=count+1
433	endif
434	! Other stuff: e.g. for simulations using co2 + neutral gaz
435	if (noms(iq).eq."Ar_N2") then
436	igcm_ar_n2=iq
437	mmol(igcm_ar_n2)=30.
438	count=count+1
439	endif
440
441
442	enddo ! of do iq=1,nqmx
443	! count=count+nbqchem
444
445	! check that we identified all tracers:
446	if (count.ne.nqmx) then
447	write(,) "initracer: found only ",count," tracers"
448	write(,) " expected ",nqmx
449	do iq=1,count
450	write(,)' ',iq,' ',trim(noms(iq))
451	enddo
452	stop
453	else
454	write(,) "initracer: found all expected tracers, namely:"
455	do iq=1,nqmx
456	write(,)' ',iq,' ',trim(noms(iq))
457	enddo
458	endif
459
460	! if water cycle but iceparty=.false., there will nevertheless be
461	! water ice at the surface (iceparty is not used anymore, but this
462	! part is still relevant, as we want to stay compatible with the
463	! older versions).
464	if (water.and.(igcm_h2o_ice.eq.0)) then
465	igcm_h2o_ice=igcm_h2o_vap ! so that qsurf(i_h2o_ice) is identified
466	! even though there is no q(i_h2o_ice)
467	else
468	! surface ice qsurf(i_h2o_ice) was loaded twice by phyetat0,
469	! as qsurf(i_h2o_vap) & as qsurf(i_h2o_ice), so to be clean:
470	if (igcm_h2o_vap.ne.0) then
471	qsurf(1:ngridmx,igcm_h2o_vap)=0
472	endif
473	endif
474
475	c------------------------------------------------------------
476	c Initialisation tracers ....
477	c------------------------------------------------------------
478	call zerophys(nqmx,rho_q)
479
480	rho_dust=2500. ! Mars dust density (kg.m-3)
481	rho_ice=920. ! Water ice density (kg.m-3)
482	nuice_ref=0.1 ! Effective variance nueff of the
483	! water-ice size distributions
484
485	if (doubleq) then
486	c "doubleq" technique
487	c -------------------
488	c (transport of mass and number mixing ratio)
489	c iq=1: Q mass mixing ratio, iq=2: N number mixing ratio
490
491	if( (nqmx.lt.2).or.(water.and.(nqmx.lt.4)) ) then
492	write(,)'initracer: nqmx is too low : nqmx=', nqmx
493	write(,)'water= ',water,' doubleq= ',doubleq
494	end if
495
496	nueff_lift = 0.5
497	varian=sqrt(log(1.+nueff_lift))
498
499	rho_q(igcm_dust_mass)=rho_dust
500	rho_q(igcm_dust_number)=rho_dust
501
502	c Intermediate calcul for computing geometric mean radius r0
503	c as a function of mass and number mixing ratio Q and N
504	c (r0 = (r3n_q * Q/ N)^(1/3))
505	r3n_q = exp(-4.5varian2)(3./4.)/(pi*rho_dust)
506
507	c Intermediate calcul for computing effective radius reff
508	c from geometric mean radius r0
509	c (reff = ref_r0 * r0)
510	ref_r0 = exp(2.5varian*2)
511
512	c lifted dust :
513	c '''''''''''
514	reff_lift = 3.0e-6 !3.e-6 !Effective radius of lifted dust (m)
515	alpha_devil(igcm_dust_mass)=9.e-9 ! dust devil lift mass coeff
516	c alpha_lift(igcm_dust_mass)=3.0e-15 ! Lifted mass coeff
517	alpha_lift(igcm_dust_mass)=1.e-6 !1.e-6 !Lifted mass coeff
518
519	r0_lift = reff_lift/ref_r0
520	alpha_devil(igcm_dust_number)=r3n_q*
521	& alpha_devil(igcm_dust_mass)/r0_lift**3
522	alpha_lift(igcm_dust_number)=r3n_q*
523	& alpha_lift(igcm_dust_mass)/r0_lift**3
524
525	radius(igcm_dust_mass) = reff_lift
526	radius(igcm_dust_number) = reff_lift
527
528	write(,) "initracer: doubleq_param reff_lift:", reff_lift
529	write(,) "initracer: doubleq_param nueff_lift:", nueff_lift
530	write(,) "initracer: doubleq_param alpha_lift:",
531	& alpha_lift(igcm_dust_mass)
532
533	else
534
535	if (dustbin.gt.1) then
536	print*,'initracer: STOP!',
537	$ ' properties of dust need to be set in initracer !!!'
538	stop
539
540	else if (dustbin.eq.1) then
541
542	c This will be used for 1 dust particle size:
543	c ------------------------------------------
544	radius(igcm_dustbin(1))=3.e-6
545	alpha_lift(igcm_dustbin(1))=0.0e-6
546	alpha_devil(igcm_dustbin(1))=7.65e-9
547	rho_q(igcm_dustbin(1))=rho_dust
548
549	endif
550	end if ! (doubleq)
551
552	c Submicron dust mode:
553	c --------------------
554
555	if (submicron) then
556	radius(igcm_dust_submicron)=0.1e-6
557	rho_q(igcm_dust_submicron)=rho_dust
558	if (doubleq) then
559	c If doubleq is also active, we use the population ratio:
560	alpha_lift(igcm_dust_submicron) =
561	& alpha_lift(igcm_dust_number)popratio
562	& rho_q(igcm_dust_submicron)4./3.pi*
563	& radius(igcm_dust_submicron)**3.
564	alpha_devil(igcm_dust_submicron)=1.e-30
565	else
566	alpha_lift(igcm_dust_submicron)=1e-6
567	alpha_devil(igcm_dust_submicron)=1.e-30
568	endif ! (doubleq)
569	end if ! (submicron)
570
571	c Initialization for photochemistry:
572	c ---------------------------------
573	if (photochem) then
574	! initialize chemistry+water (water will be correctly initialized below)
575	! by initializing everything which is not dust ...
576	do iq=1,nqmx
577	txt=noms(iq)
578	if (txt(1:4).ne."dust") then
579	radius(iq)=0.
580	alpha_lift(iq) =0.
581	alpha_devil(iq)=0.
582	endif
583	enddo ! do iq=1,nqmx
584	endif
585
586	c Initialization for water vapor
587	c ------------------------------
588	if(water) then
589	radius(igcm_h2o_vap)=0.
590	alpha_lift(igcm_h2o_vap) =0.
591	alpha_devil(igcm_h2o_vap)=0.
592	if(water.and.(nqmx.ge.2)) then
593	radius(igcm_h2o_ice)=3.e-6
594	rho_q(igcm_h2o_ice)=rho_ice
595	alpha_lift(igcm_h2o_ice) =0.
596	alpha_devil(igcm_h2o_ice)=0.
597	elseif(water.and.(nqmx.lt.2)) then
598	write(,) 'nqmx is too low : nqmx=', nqmx
599	write(,) 'water= ',water
600	endif
601
602	end if ! (water)
603
604	c Output for records:
605	c ~~~~~~~~~~~~~~~~~~
606	write(,)
607	Write(,) '******** initracer : dust transport parameters :'
608	write(,) 'alpha_lift = ', alpha_lift
609	write(,) 'alpha_devil = ', alpha_devil
610	write(,) 'radius = ', radius
611	if(doubleq) then
612	write(,) 'reff_lift (um) = ', reff_lift
613	write(,) 'size distribution variance = ', varian
614	write(,) 'r3n_q , ref_r0 : ', r3n_q , ref_r0
615	end if
616
617	!
618	! some extra (possibly redundant) sanity checks for tracers:
619	! ---------------------------------------------------------
620
621	if (doubleq) then
622	! verify that we indeed have dust_mass and dust_number tracers
623	if (igcm_dust_mass.eq.0) then
624	write(,) "initracer: error !!"
625	write(,) " cannot use doubleq option without ",
626	& "a dust_mass tracer !"
627	stop
628	endif
629	if (igcm_dust_number.eq.0) then
630	write(,) "initracer: error !!"
631	write(,) " cannot use doubleq option without ",
632	& "a dust_number tracer !"
633	stop
634	endif
635	endif
636
637	if ((.not.doubleq).and.(dustbin.gt.0)) then
638	! verify that we indeed have 'dustbin' dust tracers
639	count=0
640	do iq=1,dustbin
641	if (igcm_dustbin(iq).ne.0) then
642	count=count+1
643	endif
644	enddo
645	if (count.ne.dustbin) then
646	write(,) "initracer: error !!"
647	write(,) " dusbin is set to ",dustbin,
648	& " but we only have the following dust tracers:"
649	do iq=1,count
650	write(,)" ",trim(noms(igcm_dustbin(iq)))
651	enddo
652	stop
653	endif
654	endif
655
656	if (water) then
657	! verify that we indeed have h2o_vap and h2o_ice tracers
658	if (igcm_h2o_vap.eq.0) then
659	write(,) "initracer: error !!"
660	write(,) " cannot use water option without ",
661	& "an h2o_vap tracer !"
662	stop
663	endif
664	if (igcm_h2o_ice.eq.0) then
665	write(,) "initracer: error !!"
666	write(,) " cannot use water option without ",
667	& "an h2o_ice tracer !"
668	stop
669	endif
670	endif
671
672	if (photochem .or. callthermos) then
673	! verify that we indeed have the chemistry tracers
674	if (igcm_co2.eq.0) then
675	write(,) "initracer: error !!"
676	write(,) " cannot use chemistry option without ",
677	& "a co2 tracer !"
678	stop
679	endif
680	if (igcm_co.eq.0) then
681	write(,) "initracer: error !!"
682	write(,) " cannot use chemistry option without ",
683	& "a co tracer !"
684	stop
685	endif
686	if (igcm_o.eq.0) then
687	write(,) "initracer: error !!"
688	write(,) " cannot use chemistry option without ",
689	& "a o tracer !"
690	stop
691	endif
692	if (igcm_o1d.eq.0) then
693	write(,) "initracer: error !!"
694	write(,) " cannot use chemistry option without ",
695	& "a o1d tracer !"
696	stop
697	endif
698	if (igcm_o2.eq.0) then
699	write(,) "initracer: error !!"
700	write(,) " cannot use chemistry option without ",
701	& "an o2 tracer !"
702	stop
703	endif
704	if (igcm_o3.eq.0) then
705	write(,) "initracer: error !!"
706	write(,) " cannot use chemistry option without ",
707	& "an o3 tracer !"
708	stop
709	endif
710	if (igcm_h.eq.0) then
711	write(,) "initracer: error !!"
712	write(,) " cannot use chemistry option without ",
713	& "a h tracer !"
714	stop
715	endif
716	if (igcm_h2.eq.0) then
717	write(,) "initracer: error !!"
718	write(,) " cannot use chemistry option without ",
719	& "a h2 tracer !"
720	stop
721	endif
722	if (igcm_oh.eq.0) then
723	write(,) "initracer: error !!"
724	write(,) " cannot use chemistry option without ",
725	& "an oh tracer !"
726	stop
727	endif
728	if (igcm_ho2.eq.0) then
729	write(,) "initracer: error !!"
730	write(,) " cannot use chemistry option without ",
731	& "a ho2 tracer !"
732	stop
733	endif
734	if (igcm_h2o2.eq.0) then
735	write(,) "initracer: error !!"
736	write(,) " cannot use chemistry option without ",
737	& "a h2o2 tracer !"
738	stop
739	endif
740	if (igcm_n2.eq.0) then
741	write(,) "initracer: error !!"
742	write(,) " cannot use chemistry option without ",
743	& "a n2 tracer !"
744	stop
745	endif
746	if (igcm_ar.eq.0) then
747	write(,) "initracer: error !!"
748	write(,) " cannot use chemistry option without ",
749	& "an ar tracer !"
750	stop
751	endif
752	endif ! of if (photochem .or. callthermos)
753
754	end

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