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aeropacity.F90 @ 848

Last change on this file since 848 was 804, checked in by lkerber, 12 years ago

A bug was found in gfluxi.F. If co2_ice was the only aerosol, the single scattering albedo was occasionally equal to 1. This led to NaNs? in gfluxi.F because we divide by a (1-W0) statement. Now there is a test in gfluxi.F which puts any W0=1 to W0=99999. This change removed the necessity in aeropacity.F90 for aerosols which are supposed to be zero to be put at 1.E-9 (they are now set to zero). In the case of zero aerosols, a dummy co2 aerosol is created and set to zero abundance everywhere. An obsolete test was removed from inifis.F. Some extraneous print statements were removed from physiq.F90.

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1	Subroutine aeropacity(ngrid,nlayer,nq,pplay,pplev,pq, &
2	aerosol,reffrad,QREFvis3d,QREFir3d,tau_col,cloudfrac,totcloudfrac,clearsky)
3
4	use radinc_h, only : L_TAUMAX,naerkind
5	use aerosol_mod
6	USE comgeomfi_h
7	USE tracer_h
8
9	implicit none
10
11	!==================================================================
12	!
13	! Purpose
14	! -------
15	! Compute aerosol optical depth in each gridbox.
16	!
17	! Authors
18	! -------
19	! F. Forget
20	! F. Montmessin (water ice scheme)
21	! update J.-B. Madeleine (2008)
22	! dust removal, simplification by Robin Wordsworth (2009)
23	!
24	! Input
25	! -----
26	! ngrid Number of horizontal gridpoints
27	! nlayer Number of layers
28	! nq Number of tracers
29	! pplev Pressure (Pa) at each layer boundary
30	! pq Aerosol mixing ratio
31	! reffrad(ngrid,nlayer,naerkind) Aerosol effective radius
32	! QREFvis3d(ngrid,nlayermx,naerkind) \ 3d extinction coefficients
33	! QREFir3d(ngrid,nlayermx,naerkind) / at reference wavelengths
34	!
35	! Output
36	! ------
37	! aerosol Aerosol optical depth in layer l, grid point ig
38	! tau_col Total column optical depth at grid point ig
39	!
40	!=======================================================================
41
42	#include "dimensions.h"
43	#include "dimphys.h"
44	#include "callkeys.h"
45	#include "comcstfi.h"
46	#include "comvert.h"
47
48	INTEGER ngrid,nlayer,nq
49
50	REAL pplay(ngrid,nlayer)
51	REAL pplev(ngrid,nlayer+1)
52	REAL pq(ngrid,nlayer,nq)
53	REAL aerosol(ngrid,nlayer,naerkind)
54	REAL reffrad(ngrid,nlayer,naerkind)
55	REAL QREFvis3d(ngrid,nlayermx,naerkind)
56	REAL QREFir3d(ngrid,nlayermx,naerkind)
57
58	REAL tau_col(ngrid)
59	! REAL tauref(ngrid), tau_col(ngrid)
60
61	real cloudfrac(ngrid,nlayermx)
62	real aerosol0
63
64	INTEGER l,ig,iq,iaer
65
66	LOGICAL firstcall
67	DATA firstcall/.true./
68	SAVE firstcall
69
70	REAL CBRT
71	EXTERNAL CBRT
72
73	INTEGER,SAVE :: i_co2ice=0 ! co2 ice
74	INTEGER,SAVE :: i_h2oice=0 ! water ice
75	CHARACTER(LEN=20) :: tracername ! to temporarily store text
76
77	! for fixed dust profiles
78	real topdust, expfactor, zp
79	REAL taudusttmp(ngrid) ! Temporary dust opacity used before scaling
80	REAL tauh2so4tmp(ngrid) ! Temporary h2so4 opacity used before scaling
81	! BENJAMIN MODIFS
82	real CLFtot
83	real totcloudfrac(ngrid)
84	logical clearsky
85
86	! identify tracers
87	IF (firstcall) THEN
88
89	write(,) "Tracers found in aeropacity:"
90	do iq=1,nq
91	tracername=noms(iq)
92	if (tracername.eq."co2_ice") then
93	i_co2ice=iq
94	write(,) "i_co2ice=",i_co2ice
95
96	endif
97	if (tracername.eq."h2o_ice") then
98	i_h2oice=iq
99	write(,) "i_h2oice=",i_h2oice
100	endif
101	enddo
102
103	if (noaero) then
104	print*, "No active aerosols found in aeropacity"
105	else
106	print*, "If you would like to use aerosols, make sure any old"
107	print*, "start files are updated in newstart using the option"
108	print*, "q=0"
109	write(,) "Active aerosols found in aeropacity:"
110	endif
111
112	if ((iaero_co2.ne.0).and.(.not.noaero)) then
113	print*, 'iaero_co2= ',iaero_co2
114	endif
115	if (iaero_h2o.ne.0) then
116	print*,'iaero_h2o= ',iaero_h2o
117	endif
118	if (iaero_dust.ne.0) then
119	print*,'iaero_dust= ',iaero_dust
120	endif
121	if (iaero_h2so4.ne.0) then
122	print*,'iaero_h2so4= ',iaero_h2so4
123	endif
124
125	firstcall=.false.
126	ENDIF ! of IF (firstcall)
127
128
129	! ---------------------------------------------------------
130	!==================================================================
131	! CO2 ice aerosols
132	!==================================================================
133
134	if (iaero_co2.ne.0) then
135	iaer=iaero_co2
136	! 1. Initialization
137	aerosol(1:ngrid,1:nlayermx,iaer)=0.0
138	! 2. Opacity calculation
139	if (noaero) then ! aerosol set to zero
140	aerosol(1:ngrid,1:nlayermx,iaer)=0.0
141	elseif (aerofixco2.or.(i_co2ice.eq.0)) then ! CO2 ice cloud prescribed
142	aerosol(1:ngrid,1:nlayermx,iaer)=1.e-9
143	!aerosol(1:ngrid,12,iaer)=4.0 ! single cloud layer option
144	else
145	DO ig=1, ngrid
146	DO l=1,nlayer-1 ! to stop the rad tran bug
147
148	aerosol0 = &
149	( 0.75 * QREFvis3d(ig,l,iaer) / &
150	( rho_co2 * reffrad(ig,l,iaer) ) ) * &
151	( pq(ig,l,i_co2ice) + 1.E-9 ) * &
152	( pplev(ig,l) - pplev(ig,l+1) ) / g
153	aerosol0 = max(aerosol0,1.e-9)
154	aerosol0 = min(aerosol0,L_TAUMAX)
155	aerosol(ig,l,iaer) = aerosol0
156	! aerosol(ig,l,iaer) = 0.0
157	! print*, aerosol(ig,l,iaer)
158	! using cloud fraction
159	! aerosol(ig,l,iaer) = -log(1 - CLF + CLF*exp(-aerosol0/CLF))
160	! aerosol(ig,l,iaer) = min(aerosol(ig,l,iaer),L_TAUMAX)
161
162
163	ENDDO
164	ENDDO
165	end if ! if fixed or varying
166	end if ! if CO2 aerosols
167	!==================================================================
168	! Water ice / liquid
169	!==================================================================
170
171	if (iaero_h2o.ne.0) then
172	iaer=iaero_h2o
173	! 1. Initialization
174	aerosol(1:ngrid,1:nlayermx,iaer)=0.0
175	! 2. Opacity calculation
176	if (aerofixh2o.or.(i_h2oice.eq.0).or.clearsky) then
177	aerosol(1:ngrid,1:nlayermx,iaer) =1.e-9
178
179	! put cloud at cloudlvl
180	if(kastprof.and.(cloudlvl.ne.0.0))then
181	ig=1
182	do l=1,nlayer
183	if(int(cloudlvl).eq.l)then
184	!if(cloudlvl.gt.(pplay(ig,l)/pplev(ig,1)))then
185	print*,'Inserting cloud at level ',l
186	!aerosol(ig,l,iaer)=10.0
187
188	rho_ice=920.0
189
190	! the Kasting approximation
191	aerosol(ig,l,iaer) = &
192	( 0.75 * QREFvis3d(ig,l,iaer) / &
193	( rho_ice * reffrad(ig,l,iaer) ) ) * &
194	!( pq(ig,l,i_h2oice) + 1.E-9 ) * &
195	( 4.0e-4 + 1.E-9 ) * &
196	( pplev(ig,l) - pplev(ig,l+1) ) / g
197
198
199	open(115,file='clouds.out',form='formatted')
200	write(115,*) l,aerosol(ig,l,iaer)
201	close(115)
202
203	return
204	endif
205	end do
206
207	call abort
208	endif
209
210	else
211
212	do ig=1, ngrid
213	do l=1,nlayer-1 ! to stop the rad tran bug
214
215	aerosol(ig,l,iaer) = & !modification by BC
216	( 0.75 * QREFvis3d(ig,l,iaer) / &
217	( rho_ice * reffrad(ig,l,iaer) ) ) * &
218	! pq(ig,l,i_h2oice) * & !JL I dropped the +1e-9 here to have the same
219	!( pplev(ig,l) - pplev(ig,l+1) ) / g ! opacity in the clearsky=true and the
220	! clear=false/pq=0 case
221	( pq(ig,l,i_h2oice) + 1.E-9 ) * & ! Doing this makes the code unstable, so I have restored it (RW)
222	( pplev(ig,l) - pplev(ig,l+1) ) / g
223
224	enddo
225	enddo
226
227	if(CLFvarying)then
228	call totalcloudfrac(ngrid,nq,cloudfrac,totcloudfrac,pplev,pq,aerosol(1:ngrid,1:nlayermx,iaer))
229	do ig=1, ngrid
230	do l=1,nlayer-1 ! to stop the rad tran bug
231	CLFtot = max(totcloudfrac(ig),0.01)
232	aerosol(ig,l,iaer)=aerosol(ig,l,iaer)/CLFtot
233	aerosol(ig,l,iaer) = max(aerosol(ig,l,iaer),1.e-9)
234	enddo
235	enddo
236	else
237	do ig=1, ngrid
238	do l=1,nlayer-1 ! to stop the rad tran bug
239	CLFtot = CLFfixval
240	aerosol(ig,l,iaer)=aerosol(ig,l,iaer)/CLFtot
241	aerosol(ig,l,iaer) = max(aerosol(ig,l,iaer),1.e-9)
242	enddo
243	enddo
244	end if!(CLFvarying)
245	endif !(aerofixed.or.(i_h2oice.eq.0).or.clearsky)
246
247	end if ! End if h2o aerosol
248
249	!==================================================================
250	! Dust
251	!==================================================================
252	if (iaero_dust.ne.0) then
253	iaer=iaero_dust
254	! 1. Initialization
255	aerosol(1:ngrid,1:nlayermx,iaer)=0.0
256
257	topdust=30.0 ! km (used to be 10.0 km) LK
258
259	! 2. Opacity calculation
260
261	! expfactor=0.
262	DO l=1,nlayer-1
263	DO ig=1,ngrid
264	! Typical mixing ratio profile
265
266	zp=(preff/pplay(ig,l))**(70./topdust)
267	expfactor=max(exp(0.007*(1.-max(zp,1.))),1.e-3)
268
269	! Vertical scaling function
270	aerosol(ig,l,iaer)= (pplev(ig,l)-pplev(ig,l+1)) &
271	*expfactor
272
273
274	ENDDO
275	ENDDO
276
277	! Rescaling each layer to reproduce the choosen (or assimilated)
278	! dust extinction opacity at visible reference wavelength, which
279	! is scaled to the "preff" reference surface pressure available in comvert.h
280	! and stored in startfi.nc
281
282	taudusttmp(1:ngrid)=0.
283	DO l=1,nlayer
284	DO ig=1,ngrid
285	taudusttmp(ig) = taudusttmp(ig) &
286	+ aerosol(ig,l,iaer)
287	ENDDO
288	ENDDO
289	DO l=1,nlayer-1
290	DO ig=1,ngrid
291	aerosol(ig,l,iaer) = max(1E-20, &
292	dusttau &
293	* pplev(ig,1) / preff &
294	* aerosol(ig,l,iaer) &
295	/ taudusttmp(ig))
296
297	ENDDO
298	ENDDO
299	end if ! If dust aerosol
300
301	!==================================================================
302	! H2SO4
303	!==================================================================
304	! added by LK
305	if (iaero_h2so4.ne.0) then
306	iaer=iaero_h2so4
307
308	! 1. Initialization
309	aerosol(1:ngrid,1:nlayermx,iaer)=0.0
310
311
312	! 2. Opacity calculation
313
314	! expfactor=0.
315	DO l=1,nlayer-1
316	DO ig=1,ngrid
317	! Typical mixing ratio profile
318
319	zp=(preff/pplay(ig,l))**(70./30) !emulating topdust
320	expfactor=max(exp(0.007*(1.-max(zp,1.))),1.e-3)
321
322	! Vertical scaling function
323	aerosol(ig,l,iaer)= (pplev(ig,l)-pplev(ig,l+1))*expfactor
324
325	ENDDO
326	ENDDO
327	tauh2so4tmp(1:ngrid)=0.
328	DO l=1,nlayer
329	DO ig=1,ngrid
330	tauh2so4tmp(ig) = tauh2so4tmp(ig) + aerosol(ig,l,iaer)
331	ENDDO
332	ENDDO
333	DO l=1,nlayer-1
334	DO ig=1,ngrid
335	aerosol(ig,l,iaer) = max(1E-20, &
336	1 &
337	* pplev(ig,1) / preff &
338	* aerosol(ig,l,iaer) &
339	/ tauh2so4tmp(ig))
340
341	ENDDO
342	ENDDO
343
344	! 1/700. is assuming a "sulfurtau" of 1
345	! Sulfur aerosol routine to be improved.
346	! aerosol0 = &
347	! ( 0.75 * QREFvis3d(ig,l,iaer) / &
348	! ( rho_h2so4 * reffrad(ig,l,iaer) ) ) * &
349	! ( pq(ig,l,i_h2so4) + 1.E-9 ) * &
350	! ( pplev(ig,l) - pplev(ig,l+1) ) / g
351	! aerosol0 = max(aerosol0,1.e-9)
352	! aerosol0 = min(aerosol0,L_TAUMAX)
353	! aerosol(ig,l,iaer) = aerosol0
354
355	! ENDDO
356	! ENDDO
357	end if
358
359
360
361	! --------------------------------------------------------------------------
362	! Column integrated visible optical depth in each point (used for diagnostic)
363
364	tau_col(:)=0.0
365	do iaer = 1, naerkind
366	do l=1,nlayer
367	do ig=1,ngrid
368	tau_col(ig) = tau_col(ig) + aerosol(ig,l,iaer)
369	end do
370	end do
371	end do
372
373	do ig=1,ngrid
374	do l=1,nlayer
375	do iaer = 1, naerkind
376	if(aerosol(ig,l,iaer).gt.1.e3)then
377	print*,'WARNING: aerosol=',aerosol(ig,l,iaer)
378	print*,'at ig=',ig,', l=',l,', iaer=',iaer
379	print*,'QREFvis3d=',QREFvis3d(ig,l,iaer)
380	print*,'reffrad=',reffrad(ig,l,iaer)
381	endif
382	end do
383	end do
384	end do
385
386	do ig=1,ngrid
387	if(tau_col(ig).gt.1.e3)then
388	print*,'WARNING: tau_col=',tau_col(ig)
389	print*,'at ig=',ig
390	print*,'aerosol=',aerosol(ig,:,:)
391	print*,'QREFvis3d=',QREFvis3d(ig,:,:)
392	print*,'reffrad=',reffrad(ig,:,:)
393	endif
394	end do
395	return
396	end subroutine aeropacity
397

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