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initracer.F @ 168

Last change on this file since 168 was 164, checked in by emillour, 14 years ago

Mars GCM:

Updates and corrections (to enable compiling/running in debug mode with

ifort)

removed option "-free-form" from makegcm_ifort and set mod_loc_dir="." so that module files (produced in local directory by ifort) are moved to LIBO
updated initracer.F, physdem1.F, physiq.F, inichim_newstart.F to avoid referencing out-of-bound array indexes (even if unused)
cosmetic updates on inwrite.F, datareadnc.F
updated newstart.F to initialize and use 'datadir' when looking for files
corrected bug on interpolation of sub-surface temperatures in lect_start_archive.F

File size: 24.1 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 "watercap.h"
46	#include "chimiedata.h"
47
48	#include "surfdat.h"
49
50	real qsurf(ngridmx,nqmx) ! tracer on surface (e.g. kg.m-2)
51	real co2ice(ngridmx) ! co2 ice mass on surface (e.g. kg.m-2)
52	integer iq,ig,count, yeyey
53	real r0_lift , reff_lift, nueff_lift
54	c Ratio of small over large dust particles (used when both
55	c doubleq and the submicron mode are active); In Montmessin
56	c et al. (2002), a value of 25 has been deduced;
57	real, parameter :: popratio = 25.
58	logical :: oldnames ! =.true. if old tracer naming convention (q01,...)
59	character(len=20) :: txt ! to store some text
60
61	c-----------------------------------------------------------------------
62	c radius(nqmx) ! aerosol particle radius (m)
63	c rho_q(nqmx) ! tracer densities (kg.m-3)
64	c alpha_lift(nqmx) ! saltation vertical flux/horiz flux ratio (m-1)
65	c alpha_devil(nqmx) ! lifting coeeficient by dust devil
66	c rho_dust ! Mars dust density
67	c rho_ice ! Water ice density
68	c nuice_ref ! Effective variance nueff of the
69	c ! water-ice size distributions
70	c doubleq ! if method with mass (iq=1) and number(iq=2) mixing ratio
71	c varian ! Characteristic variance of log-normal distribution
72	c-----------------------------------------------------------------------
73
74	integer :: nqchem_start
75
76	! Initialization: get tracer names from the dynamics and check if we are
77	! using 'old' tracer convention ('q01',q02',...)
78	! or new convention (full tracer names)
79	! check if tracers have 'old' names
80	oldnames=.false.
81	count=0
82	do iq=1,nqmx
83	txt=" "
84	write(txt,'(a1,i2.2)') 'q',iq
85	if (txt.eq.tnom(iq)) then
86	count=count+1
87	endif
88	enddo ! of do iq=1,nqmx
89
90	if (count.eq.nqmx) then
91	write(,) "initracer: tracers seem to follow old naming ",
92	& "convention (q01,q02,...)"
93	write(,) " => will work for now ... "
94	write(,) " but you should run newstart to rename them"
95	oldnames=.true.
96	endif
97
98	! copy/set tracer names
99	if (oldnames) then ! old names (derived from iq & option values)
100	! 1. dust:
101	if (dustbin.ne.0) then ! transported dust
102	do iq=1,dustbin
103	txt=" "
104	write(txt,'(a4,i2.2)') 'dust',iq
105	noms(iq)=txt
106	mmol(iq)=100.
107	enddo
108	! special case if doubleq
109	if (doubleq) then
110	if (dustbin.ne.2) then
111	write(,) 'initracer: error expected dustbin=2'
112	else
113	! noms(1)='dust_mass' ! dust mass mixing ratio
114	! noms(2)='dust_number' ! dust number mixing ratio
115	! same as above, but avoid explict possible out-of-bounds on array
116	noms(1)='dust_mass' ! dust mass mixing ratio
117	do iq=2,2
118	noms(iq)='dust_number' ! dust number mixing ratio
119	enddo
120	endif
121	endif
122	endif
123	! 2. water & ice
124	if (water) then
125	noms(nqmx)='h2o_vap'
126	mmol(nqmx)=18.
127	! noms(nqmx-1)='h2o_ice'
128	! mmol(nqmx-1)=18.
129	!"loop" to avoid potential out-of-bounds in array
130	do iq=nqmx-1,nqmx-1
131	noms(iq)='h2o_ice'
132	mmol(iq)=18.
133	enddo
134	endif
135	! 3. Chemistry
136	if (photochem .or. callthermos) then
137	if (doubleq) then
138	nqchem_start=3
139	else
140	nqchem_start=dustbin+1
141	end if
142	do iq=nqchem_start,nqchem_start+ncomp-1
143	noms(iq)=nomchem(iq-nqchem_start+1)
144	mmol(iq)=mmolchem(iq-nqchem_start+1)
145	enddo
146	endif ! of if (photochem .or. callthermos)
147	! 4. Other tracers ????
148	if ((dustbin.eq.0).and.(.not.water)) then
149	noms(1)='co2'
150	mmol(1)=44
151	if (nqmx.eq.2) then
152	noms(nqmx)='Ar_N2'
153	mmol(nqmx)=30
154	endif
155	endif
156	else
157	! copy tracer names from dynamics
158	do iq=1,nqmx
159	noms(iq)=tnom(iq)
160	enddo
161	! mmol(:) array is initialized later (see below)
162	endif ! of if (oldnames)
163
164	! special modification when using 'old' tracers:
165	! qsurf(nqmx) was h2o ice whereas q(nqmx) was water vapour
166	! and (if iceparty) q(nqmx-1) was null whereas q(nqmx-1) was water ice
167	if (oldnames.and.water) then
168	write(,)'initracer: moving surface water ice to index ',nqmx-1
169	! "loop" to avoid potential out-of-bounds on arrays
170	do iq=nqmx-1,nqmx-1
171	qsurf(1:ngridmx,iq)=qsurf(1:ngridmx,iq+1)
172	enddo
173	qsurf(1:ngridmx,nqmx)=0
174	endif
175
176	c------------------------------------------------------------
177	c Test Dimensions tracers
178	c------------------------------------------------------------
179
180	! Ehouarn: testing number of tracers is obsolete...
181	! if(photochem.or.thermochem) then
182	! if (water) then
183	! if ((dustbin+ncomp+2).ne.nqmx) then
184	! print*,'initracer: tracer dimension problem:'
185	! print*,"(dustbin+ncomp+2).ne.nqmx"
186	! print*,"ncomp: ",ncomp
187	! print*,"dustbin: ",dustbin
188	! print*,"nqmx: ",nqmx
189	! print*,'Change ncomp in chimiedata.h'
190	! endif
191	! else
192	! if ((dustbin+ncomp+1).ne.nqmx) then
193	! print*,'initracer: tracer dimension problem:'
194	! print*,"(dustbin+ncomp+1).ne.nqmx"
195	! print*,"ncomp: ",ncomp
196	! print*,"dustbin: ",dustbin
197	! print*,"nqmx: ",nqmx
198	! print*,'Change ncomp in chimiedata.h'
199	! STOP
200	! endif
201	! endif
202	! endif
203
204	c------------------------------------------------------------
205	c NAME and molar mass of the tracer
206	c------------------------------------------------------------
207
208
209	! Identify tracers by their names: (and set corresponding values of mmol)
210	! 0. initialize tracer indexes to zero:
211	do iq=1,nqmx
212	igcm_dustbin(iq)=0
213	enddo
214	igcm_dust_mass=0
215	igcm_dust_number=0
216	igcm_dust_submicron=0
217	igcm_h2o_vap=0
218	igcm_h2o_ice=0
219	igcm_co2=0
220	igcm_co=0
221	igcm_o=0
222	igcm_o1d=0
223	igcm_o2=0
224	igcm_o3=0
225	igcm_h=0
226	igcm_h2=0
227	igcm_oh=0
228	igcm_ho2=0
229	igcm_h2o2=0
230	igcm_n2=0
231	igcm_ar=0
232	igcm_ar_n2=0
233
234	! 1. find dust tracers
235	count=0
236	if (dustbin.gt.0) then
237	do iq=1,nqmx
238	txt=" "
239	write(txt,'(a4,i2.2)')'dust',count+1
240	if (noms(iq).eq.txt) then
241	count=count+1
242	igcm_dustbin(count)=iq
243	mmol(iq)=100.
244	endif
245	enddo !do iq=1,nqmx
246	endif ! of if (dustbin.gt.0)
247	if (doubleq) then
248	do iq=1,nqmx
249	if (noms(iq).eq."dust_mass") then
250	igcm_dust_mass=iq
251	count=count+1
252	endif
253	if (noms(iq).eq."dust_number") then
254	igcm_dust_number=iq
255	count=count+1
256	endif
257	enddo
258	endif ! of if (doubleq)
259	if (submicron) then
260	do iq=1,nqmx
261	if (noms(iq).eq."dust_submicron") then
262	igcm_dust_submicron=iq
263	mmol(iq)=100.
264	count=count+1
265	endif
266	enddo
267	endif ! of if (submicron)
268	! 2. find chemistry and water tracers
269	do iq=1,nqmx
270	if (noms(iq).eq."co2") then
271	igcm_co2=iq
272	mmol(igcm_co2)=44.
273	count=count+1
274	endif
275	if (noms(iq).eq."co") then
276	igcm_co=iq
277	mmol(igcm_co)=28.
278	count=count+1
279	endif
280	if (noms(iq).eq."o") then
281	igcm_o=iq
282	mmol(igcm_o)=16.
283	count=count+1
284	endif
285	if (noms(iq).eq."o1d") then
286	igcm_o1d=iq
287	mmol(igcm_o1d)=16.
288	count=count+1
289	endif
290	if (noms(iq).eq."o2") then
291	igcm_o2=iq
292	mmol(igcm_o2)=32.
293	count=count+1
294	endif
295	if (noms(iq).eq."o3") then
296	igcm_o3=iq
297	mmol(igcm_o3)=48.
298	count=count+1
299	endif
300	if (noms(iq).eq."h") then
301	igcm_h=iq
302	mmol(igcm_h)=1.
303	count=count+1
304	endif
305	if (noms(iq).eq."h2") then
306	igcm_h2=iq
307	mmol(igcm_h2)=2.
308	count=count+1
309	endif
310	if (noms(iq).eq."oh") then
311	igcm_oh=iq
312	mmol(igcm_oh)=17.
313	count=count+1
314	endif
315	if (noms(iq).eq."ho2") then
316	igcm_ho2=iq
317	mmol(igcm_ho2)=33.
318	count=count+1
319	endif
320	if (noms(iq).eq."h2o2") then
321	igcm_h2o2=iq
322	mmol(igcm_h2o2)=34.
323	count=count+1
324	endif
325	if (noms(iq).eq."n2") then
326	igcm_n2=iq
327	mmol(igcm_n2)=28.
328	count=count+1
329	endif
330	if (noms(iq).eq."ar") then
331	igcm_ar=iq
332	mmol(igcm_ar)=40.
333	count=count+1
334	endif
335	if (noms(iq).eq."h2o_vap") then
336	igcm_h2o_vap=iq
337	mmol(igcm_h2o_vap)=18.
338	count=count+1
339	endif
340	if (noms(iq).eq."h2o_ice") then
341	igcm_h2o_ice=iq
342	mmol(igcm_h2o_ice)=18.
343	count=count+1
344	endif
345	! Other stuff: e.g. for simulations using co2 + neutral gaz
346	if (noms(iq).eq."Ar_N2") then
347	igcm_ar_n2=iq
348	mmol(igcm_ar_n2)=30.
349	count=count+1
350	endif
351	enddo ! of do iq=1,nqmx
352	! count=count+nbqchem
353
354	! check that we identified all tracers:
355	if (count.ne.nqmx) then
356	write(,) "initracer: found only ",count," tracers"
357	write(,) " expected ",nqmx
358	do iq=1,count
359	write(,)' ',iq,' ',trim(noms(iq))
360	enddo
361	stop
362	else
363	write(,) "initracer: found all expected tracers, namely:"
364	do iq=1,nqmx
365	write(,)' ',iq,' ',trim(noms(iq))
366	enddo
367	endif
368
369	! if water cycle but iceparty=.false., there will nevertheless be
370	! water ice at the surface (iceparty is not used anymore, but this
371	! part is still relevant, as we want to stay compatible with the
372	! older versions).
373	if (water.and.(igcm_h2o_ice.eq.0)) then
374	igcm_h2o_ice=igcm_h2o_vap ! so that qsurf(i_h2o_ice) is identified
375	! even though there is no q(i_h2o_ice)
376	else
377	! surface ice qsurf(i_h2o_ice) was loaded twice by phyetat0,
378	! as qsurf(i_h2o_vap) & as qsurf(i_h2o_ice), so to be clean:
379	if (igcm_h2o_vap.ne.0) then
380	qsurf(1:ngridmx,igcm_h2o_vap)=0
381	endif
382	endif
383
384	c------------------------------------------------------------
385	c Initialisation tracers ....
386	c------------------------------------------------------------
387	call zerophys(nqmx,rho_q)
388
389	rho_dust=2500. ! Mars dust density (kg.m-3)
390	rho_ice=920. ! Water ice density (kg.m-3)
391	nuice_ref=0.1 ! Effective variance nueff of the
392	! water-ice size distributions
393
394	if (doubleq) then
395	c "doubleq" technique
396	c -------------------
397	c (transport of mass and number mixing ratio)
398	c iq=1: Q mass mixing ratio, iq=2: N number mixing ratio
399
400	if( (nqmx.lt.2).or.(water.and.(nqmx.lt.4)) ) then
401	write(,)'initracer: nqmx is too low : nqmx=', nqmx
402	write(,)'water= ',water,' doubleq= ',doubleq
403	end if
404
405	nueff_lift = 0.5
406	varian=sqrt(log(1.+nueff_lift))
407
408	rho_q(igcm_dust_mass)=rho_dust
409	rho_q(igcm_dust_number)=rho_dust
410
411	c Intermediate calcul for computing geometric mean radius r0
412	c as a function of mass and number mixing ratio Q and N
413	c (r0 = (r3n_q * Q/ N)^(1/3))
414	r3n_q = exp(-4.5varian2)(3./4.)/(pi*rho_dust)
415
416	c Intermediate calcul for computing effective radius reff
417	c from geometric mean radius r0
418	c (reff = ref_r0 * r0)
419	ref_r0 = exp(2.5varian*2)
420
421	c lifted dust :
422	c '''''''''''
423	reff_lift = 3.0e-6 !3.e-6 !Effective radius of lifted dust (m)
424	alpha_devil(igcm_dust_mass)=9.e-9 ! dust devil lift mass coeff
425	c alpha_lift(igcm_dust_mass)=3.0e-15 ! Lifted mass coeff
426	alpha_lift(igcm_dust_mass)=1.e-6 !1.e-6 !Lifted mass coeff
427
428	r0_lift = reff_lift/ref_r0
429	alpha_devil(igcm_dust_number)=r3n_q*
430	& alpha_devil(igcm_dust_mass)/r0_lift**3
431	alpha_lift(igcm_dust_number)=r3n_q*
432	& alpha_lift(igcm_dust_mass)/r0_lift**3
433
434	radius(igcm_dust_mass) = reff_lift
435	radius(igcm_dust_number) = reff_lift
436
437	write(,) "initracer: doubleq_param reff_lift:", reff_lift
438	write(,) "initracer: doubleq_param nueff_lift:", nueff_lift
439	write(,) "initracer: doubleq_param alpha_lift:",
440	& alpha_lift(igcm_dust_mass)
441
442	else
443
444	if (dustbin.gt.1) then
445	print*,'initracer: STOP!',
446	$ ' properties of dust need to be set in initracer !!!'
447	stop
448
449	else if (dustbin.eq.1) then
450
451	c This will be used for 1 dust particle size:
452	c ------------------------------------------
453	radius(igcm_dustbin(1))=3.e-6
454	alpha_lift(igcm_dustbin(1))=0.0e-6
455	alpha_devil(igcm_dustbin(1))=7.65e-9
456	rho_q(igcm_dustbin(1))=rho_dust
457
458	endif
459	end if ! (doubleq)
460
461	c Submicron dust mode:
462	c --------------------
463
464	if (submicron) then
465	radius(igcm_dust_submicron)=0.1e-6
466	rho_q(igcm_dust_submicron)=rho_dust
467	if (doubleq) then
468	c If doubleq is also active, we use the population ratio:
469	alpha_lift(igcm_dust_submicron) =
470	& alpha_lift(igcm_dust_number)popratio
471	& rho_q(igcm_dust_submicron)4./3.pi*
472	& radius(igcm_dust_submicron)**3.
473	alpha_devil(igcm_dust_submicron)=1.e-30
474	else
475	alpha_lift(igcm_dust_submicron)=1e-6
476	alpha_devil(igcm_dust_submicron)=1.e-30
477	endif ! (doubleq)
478	end if ! (submicron)
479
480	c Initialization for photochemistry:
481	c ---------------------------------
482	if (photochem) then
483	! initialize chemistry+water (water will be correctly initialized below)
484	! by initializing everything which is not dust ...
485	do iq=1,nqmx
486	txt=noms(iq)
487	if (txt(1:4).ne."dust") then
488	radius(iq)=0.
489	alpha_lift(iq) =0.
490	alpha_devil(iq)=0.
491	endif
492	enddo ! do iq=1,nqmx
493	endif
494
495	c Initialization for water vapor
496	c ------------------------------
497	if(water) then
498	radius(igcm_h2o_vap)=0.
499	alpha_lift(igcm_h2o_vap) =0.
500	alpha_devil(igcm_h2o_vap)=0.
501
502	c "Dryness coefficient" controlling the evaporation and
503	c sublimation from the ground water ice (close to 1)
504	c HERE, the goal is to correct for the fact
505	c that the simulated permanent water ice polar caps
506	c is larger than the actual cap and the atmospheric
507	c opacity not always realistic.
508
509	do ig=1,ngridmx
510	if (ngridmx.ne.1) watercaptag(ig)=.false.
511	dryness(ig) = 1.
512	enddo
513
514	IF (caps) THEN
515	c Perennial H20 north cap defined by watercaptag=true (allows surface to be
516	c hollowed by sublimation in vdifc).
517	yeyey = 0
518	do ig=1,ngridmx
519	! !!! TESTS TESTS outliers
520	! !!! TESTS TESTS outliers
521	! if ( ( lati(ig)*180./pi .ge. 75 ) .and.
522	! . ( lati(ig)*180./pi .le. 77 ) .and.
523	! . ( ( ( long(ig)*180./pi .ge. 000. ) .and.
524	! . ( long(ig)*180./pi .le. 120. ) )
525	! . .or.
526	! . ( ( long(ig)*180./pi .ge. -130. ) .and.
527	! . ( long(ig)*180./pi .le. -115. ) ) ) ) then
528	! if (yeyey .eq. 0) then !!! 1/2 en 64x48 sinon trop large en lat
529	! write(,) "outliers ", lati(ig)180./pi, long(ig)180./pi
530	! if (ngridmx.ne.1) watercaptag(ig)=.true.
531	! dryness(ig) = 1.
532	! albedodat(ig) = 0.45 !! comme alb_surfice
533	! yeyey = 1
534	! else
535	! yeyey = 0
536	! endif
537	! endif
538	! !!! TESTS TESTS outliers
539	! !!! TESTS TESTS outliers
540	!
541	! !!! TESTS TESTS addcap
542	! !!! TESTS TESTS addcap
543	! if ( ( lati(ig)*180./pi .ge. 82 ) .and.
544	! . ( lati(ig)*180./pi .le. 84 ) .and.
545	! . ( ( long(ig)*180./pi .gt. -030. ) .and.
546	! . ( long(ig)*180./pi .lt. 090. ) ) ) then
547	! write(,) "capadd ", lati(ig)180./pi, long(ig)180./pi
548	! if (ngridmx.ne.1) watercaptag(ig)=.true.
549	! albedodat(ig) = 0.45 !! comme alb_surfice
550	! dryness(ig) = 1.
551	! endif
552	! !!! TESTS TESTS addcap
553	! !!! TESTS TESTS addcap
554
555	if (lati(ig)*180./pi.gt.84) then
556	if (ngridmx.ne.1) watercaptag(ig)=.true.
557	dryness(ig) = 1.
558	c Use the following cap definition for high spatial resolution (latitudinal bin <= 5 deg)
559	c if (lati(ig)*180./pi.lt.85.and.long(ig).ge.0) then
560	c if (ngridmx.ne.1) watercaptag(ig)=.true.
561	c dryness(ig) = 1.
562	c endif
563	c if (lati(ig)*180./pi.ge.85) then
564	c if (ngridmx.ne.1) watercaptag(ig)=.true.
565	c dryness(ig) = 1.
566	c endif
567	endif ! (lati>80 deg)
568	end do ! (ngridmx)
569	ENDIF ! (caps)
570
571	if(water.and.(nqmx.ge.2)) then
572	radius(igcm_h2o_ice)=3.e-6
573	rho_q(igcm_h2o_ice)=rho_ice
574	alpha_lift(igcm_h2o_ice) =0.
575	alpha_devil(igcm_h2o_ice)=0.
576	elseif(water.and.(nqmx.lt.2)) then
577	write(,) 'nqmx is too low : nqmx=', nqmx
578	write(,) 'water= ',water
579	endif
580
581	end if ! (water)
582
583	c Output for records:
584	c ~~~~~~~~~~~~~~~~~~
585	write(,)
586	Write(,) '******** initracer : dust transport parameters :'
587	write(,) 'alpha_lift = ', alpha_lift
588	write(,) 'alpha_devil = ', alpha_devil
589	write(,) 'radius = ', radius
590	if(doubleq) then
591	write(,) 'reff_lift (um) = ', reff_lift
592	write(,) 'size distribution variance = ', varian
593	write(,) 'r3n_q , ref_r0 : ', r3n_q , ref_r0
594	end if
595
596	!
597	! some extra (possibly redundant) sanity checks for tracers:
598	! ---------------------------------------------------------
599
600	if (doubleq) then
601	! verify that we indeed have dust_mass and dust_number tracers
602	if (igcm_dust_mass.eq.0) then
603	write(,) "initracer: error !!"
604	write(,) " cannot use doubleq option without ",
605	& "a dust_mass tracer !"
606	stop
607	endif
608	if (igcm_dust_number.eq.0) then
609	write(,) "initracer: error !!"
610	write(,) " cannot use doubleq option without ",
611	& "a dust_number tracer !"
612	stop
613	endif
614	endif
615
616	if ((.not.doubleq).and.(dustbin.gt.0)) then
617	! verify that we indeed have 'dustbin' dust tracers
618	count=0
619	do iq=1,dustbin
620	if (igcm_dustbin(iq).ne.0) then
621	count=count+1
622	endif
623	enddo
624	if (count.ne.dustbin) then
625	write(,) "initracer: error !!"
626	write(,) " dusbin is set to ",dustbin,
627	& " but we only have the following dust tracers:"
628	do iq=1,count
629	write(,)" ",trim(noms(igcm_dustbin(iq)))
630	enddo
631	stop
632	endif
633	endif
634
635	if (water) then
636	! verify that we indeed have h2o_vap and h2o_ice tracers
637	if (igcm_h2o_vap.eq.0) then
638	write(,) "initracer: error !!"
639	write(,) " cannot use water option without ",
640	& "an h2o_vap tracer !"
641	stop
642	endif
643	if (igcm_h2o_ice.eq.0) then
644	write(,) "initracer: error !!"
645	write(,) " cannot use water option without ",
646	& "an h2o_ice tracer !"
647	stop
648	endif
649	endif
650
651	if (photochem .or. callthermos) then
652	! verify that we indeed have the chemistry tracers
653	if (igcm_co2.eq.0) then
654	write(,) "initracer: error !!"
655	write(,) " cannot use chemistry option without ",
656	& "a co2 tracer !"
657	stop
658	endif
659	if (igcm_co.eq.0) then
660	write(,) "initracer: error !!"
661	write(,) " cannot use chemistry option without ",
662	& "a co tracer !"
663	stop
664	endif
665	if (igcm_o.eq.0) then
666	write(,) "initracer: error !!"
667	write(,) " cannot use chemistry option without ",
668	& "a o tracer !"
669	stop
670	endif
671	if (igcm_o1d.eq.0) then
672	write(,) "initracer: error !!"
673	write(,) " cannot use chemistry option without ",
674	& "a o1d tracer !"
675	stop
676	endif
677	if (igcm_o2.eq.0) then
678	write(,) "initracer: error !!"
679	write(,) " cannot use chemistry option without ",
680	& "an o2 tracer !"
681	stop
682	endif
683	if (igcm_o3.eq.0) then
684	write(,) "initracer: error !!"
685	write(,) " cannot use chemistry option without ",
686	& "an o3 tracer !"
687	stop
688	endif
689	if (igcm_h.eq.0) then
690	write(,) "initracer: error !!"
691	write(,) " cannot use chemistry option without ",
692	& "a h tracer !"
693	stop
694	endif
695	if (igcm_h2.eq.0) then
696	write(,) "initracer: error !!"
697	write(,) " cannot use chemistry option without ",
698	& "a h2 tracer !"
699	stop
700	endif
701	if (igcm_oh.eq.0) then
702	write(,) "initracer: error !!"
703	write(,) " cannot use chemistry option without ",
704	& "an oh tracer !"
705	stop
706	endif
707	if (igcm_ho2.eq.0) then
708	write(,) "initracer: error !!"
709	write(,) " cannot use chemistry option without ",
710	& "a ho2 tracer !"
711	stop
712	endif
713	if (igcm_h2o2.eq.0) then
714	write(,) "initracer: error !!"
715	write(,) " cannot use chemistry option without ",
716	& "a h2o2 tracer !"
717	stop
718	endif
719	if (igcm_n2.eq.0) then
720	write(,) "initracer: error !!"
721	write(,) " cannot use chemistry option without ",
722	& "a n2 tracer !"
723	stop
724	endif
725	if (igcm_ar.eq.0) then
726	write(,) "initracer: error !!"
727	write(,) " cannot use chemistry option without ",
728	& "an ar tracer !"
729	stop
730	endif
731	endif ! of if (photochem .or. callthermos)
732
733	end

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