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optcv.F90 @ 1788

Last change on this file since 1788 was 1788, checked in by jvatant, 7 years ago
Get rid of all the old-generic dummy aerosol scheme ( just left scatterers_h for compilation ) as the new microphysics for Titan will be plugged in -> even removed sedimentation ( will be done in the microphysical model ) --JVO
Property svn:executable set to ``*
File size: 11.1 KB

Line
1	SUBROUTINE OPTCV(DTAUV,TAUV,TAUCUMV,PLEV, &
2	WBARV,COSBV,TAURAY,TMID,PMID,TAUGSURF)
3
4	use radinc_h
5	use radcommon_h, only: gasv, tlimit, Cmk, tgasref, pfgasref,wnov,scalep,indv,glat_ig,gweight
6	use gases_h
7	use comcstfi_mod, only: g, r
8	use callkeys_mod, only: continuum,graybody,callgasvis
9
10	implicit none
11
12	!==================================================================
13	!
14	! Purpose
15	! -------
16	! Calculates shortwave optical constants at each level.
17	!
18	! Authors
19	! -------
20	! Adapted from the NASA Ames code by R. Wordsworth (2009)
21	!
22	!==================================================================
23	!
24	! THIS SUBROUTINE SETS THE OPTICAL CONSTANTS IN THE VISUAL
25	! IT CALCULATES FOR EACH LAYER, FOR EACH SPECTRAL INTERVAL IN THE VISUAL
26	! LAYER: WBAR, DTAU, COSBAR
27	! LEVEL: TAU
28	!
29	! TAUV(L,NW,NG) is the cumulative optical depth at the top of radiation code
30	! layer L. NW is spectral wavelength interval, ng the Gauss point index.
31	!
32	! TLEV(L) - Temperature at the layer boundary
33	! PLEV(L) - Pressure at the layer boundary (i.e. level)
34	! GASV(NT,NPS,NW,NG) - Visible k-coefficients
35	!
36	!-------------------------------------------------------------------
37
38
39	real*8 DTAUV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
40	real*8 DTAUKV(L_LEVELS,L_NSPECTV,L_NGAUSS)
41	real*8 TAUV(L_NLEVRAD,L_NSPECTV,L_NGAUSS)
42	real*8 TAUCUMV(L_LEVELS,L_NSPECTV,L_NGAUSS)
43	real*8 PLEV(L_LEVELS)
44	real*8 TMID(L_LEVELS), PMID(L_LEVELS)
45	real*8 COSBV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
46	real*8 WBARV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
47
48	! Titan customisation
49	! J. Vatant d'Ollone (2016)
50	real*8 DHAZE_T(L_LEVELS,L_NSPECTI)
51	real*8 DHAZES_T(L_LEVELS,L_NSPECTI)
52	real*8 SSA_T(L_LEVELS,L_NSPECTI)
53	real*8 ASF_T(L_LEVELS,L_NSPECTI)
54	real*8 INT_DTAU(L_NLAYRAD,L_NSPECTI)
55	real*8 K_HAZE(L_NLAYRAD,L_NSPECTI)
56
57	CHARACTER*2 str2
58	! ==========================
59
60	integer L, NW, NG, K, LK, IAER
61	integer MT(L_LEVELS), MP(L_LEVELS), NP(L_LEVELS)
62	real*8 ANS, TAUGAS
63	real*8 TAURAY(L_NSPECTV)
64	real*8 TRAY(L_LEVELS,L_NSPECTV)
65	real*8 DPR(L_LEVELS), U(L_LEVELS)
66	real*8 LCOEF(4), LKCOEF(L_LEVELS,4)
67
68	real*8 taugsurf(L_NSPECTV,L_NGAUSS-1)
69	real*8 DCONT
70	real*8 DRAYAER
71	double precision wn_cont, p_cont, p_air, T_cont, dtemp, dtempc
72	double precision p_cross
73
74	real*8 KCOEF(4)
75
76	! temporary variable to reduce memory access time to gasv
77	real*8 tmpk(2,2)
78
79	! temporary variables for multiple aerosol calculation
80	real*8 atemp(L_NLAYRAD,L_NSPECTV)
81	real*8 btemp(L_NLAYRAD,L_NSPECTV)
82	real*8 ctemp(L_NLAYRAD,L_NSPECTV)
83
84	! variables for k in units m^-1
85	real*8 dz(L_LEVELS)
86
87	integer igas, jgas, ilay
88
89	integer interm
90
91	!! AS: to save time in computing continuum (see bilinearbig)
92	IF (.not.ALLOCATED(indv)) THEN
93	ALLOCATE(indv(L_NSPECTV,ngasmx,ngasmx))
94	indv = -9999 ! this initial value means "to be calculated"
95	ENDIF
96
97	!=======================================================================
98	! Determine the total gas opacity throughout the column, for each
99	! spectral interval, NW, and each Gauss point, NG.
100	! Calculate the continuum opacities, i.e., those that do not depend on
101	! NG, the Gauss index.
102
103	taugsurf(:,:) = 0.0
104	dpr(:) = 0.0
105	lkcoef(:,:) = 0.0
106
107	do K=2,L_LEVELS
108	DPR(k) = PLEV(K)-PLEV(K-1)
109
110	! if we have continuum opacities, we need dz
111
112	dz(k) = dpr(k)RTMID(K)/(glat_ig*PMID(K))
113	U(k) = Cmk*DPR(k) ! only Cmk line in optcv.F
114
115	call tpindex(PMID(K),TMID(K),pfgasref,tgasref,LCOEF,MT(K),MP(K))
116
117	do LK=1,4
118	LKCOEF(K,LK) = LCOEF(LK)
119	end do
120	end do ! levels
121
122	! Rayleigh scattering
123	do NW=1,L_NSPECTV
124	do K=2,L_LEVELS
125	TRAY(K,NW) = TAURAY(NW) * DPR(K)
126	end do ! levels
127	end do
128
129	! we ignore K=1...
130	do K=2,L_LEVELS
131
132	ilay = k / 2 ! int. arithmetic => gives the gcm layer index
133
134	do NW=1,L_NSPECTV
135
136	!================= Titan customisation ========================================
137	call disr_haze(dz(k),plev(k),wnov(nw),dhaze_T(k,nw),SSA_T(k,nw),ASF_T(k,nw))
138	! =============================================================================
139
140	DRAYAER = TRAY(K,NW)
141	! DRAYAER is Tau RAYleigh scattering, plus AERosol opacity
142	DRAYAER = DRAYAER + DHAZE_T(K,NW) ! Titan's aerosol
143
144	DCONT = 0.0 ! continuum absorption
145
146	if(continuum.and.(.not.graybody).and.callgasvis)then
147	! include continua if necessary
148	wn_cont = dble(wnov(nw))
149	T_cont = dble(TMID(k))
150	do igas=1,ngasmx
151
152	p_cont = dble(PMID(k)scalepgfrac(igas,ilay))
153
154	dtemp=0.0
155	if(igas.eq.igas_N2)then
156
157	interm = indv(nw,igas,igas)
158	! call interpolateN2N2(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
159	indv(nw,igas,igas) = interm
160	! only goes to 500 cm^-1, so unless we're around a cold brown dwarf, this is irrelevant in the visible
161
162	elseif(igas.eq.igas_H2)then
163
164	! first do self-induced absorption
165	interm = indv(nw,igas,igas)
166	call interpolateH2H2(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
167	indv(nw,igas,igas) = interm
168
169	! then cross-interactions with other gases
170	do jgas=1,ngasmx
171	p_cross = dble(PMID(k)scalepgfrac(jgas,ilay))
172	dtempc = 0.0
173	if(jgas.eq.igas_N2)then
174	interm = indv(nw,igas,jgas)
175	call interpolateN2H2(wn_cont,T_cont,p_cross,p_cont,dtempc,.false.,interm)
176	indv(nw,igas,jgas) = interm
177	! should be irrelevant in the visible
178	endif
179	dtemp = dtemp + dtempc
180	enddo
181
182	elseif(igas.eq.igas_CH4)then
183
184	! first do self-induced absorption
185	interm = indv(nw,igas,igas)
186	call interpolateCH4CH4(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
187	indv(nw,igas,igas) = interm
188
189	! then cross-interactions with other gases
190	do jgas=1,ngasmx
191	p_cross = dble(PMID(k)scalepgfrac(jgas,ilay))
192	dtempc = 0.0
193	if(jgas.eq.igas_N2)then
194	interm = indv(nw,igas,jgas)
195	call interpolateN2CH4(wn_cont,T_cont,p_cross,p_cont,dtempc,.false.,interm)
196	indv(nw,igas,jgas) = interm
197	endif
198	dtemp = dtemp + dtempc
199	enddo
200
201	endif
202
203	DCONT = DCONT + dtemp
204
205	enddo
206
207	DCONT = DCONT*dz(k)
208
209	endif
210
211	do ng=1,L_NGAUSS-1
212
213	! Now compute TAUGAS
214
215	! JVO 2017 : added tmpk because the repeated calls to gasi/v increased dramatically
216	! the execution time of optci/v -> ~ factor 2 on the whole radiative
217	! transfer on the tested simulations !
218
219	tmpk = GASV(MT(K):MT(K)+1,MP(K):MP(K)+1,1,NW,NG)
220
221	KCOEF(1) = tmpk(1,1) ! KCOEF(1) = GASV(MT(K),MP(K),1,NW,NG)
222	KCOEF(2) = tmpk(1,2) ! KCOEF(2) = GASV(MT(K),MP(K)+1,1,NW,NG)
223	KCOEF(3) = tmpk(2,2) ! KCOEF(3) = GASV(MT(K)+1,MP(K)+1,1,NW,NG)
224	KCOEF(4) = tmpk(2,1) ! KCOEF(4) = GASV(MT(K)+1,MP(K),1,NW,NG)
225
226	! Interpolate the gaseous k-coefficients to the requested T,P values
227
228	ANS = LKCOEF(K,1)KCOEF(1) + LKCOEF(K,2)KCOEF(2) + &
229	LKCOEF(K,3)KCOEF(3) + LKCOEF(K,4)KCOEF(4)
230
231
232	TAUGAS = U(k)*ANS
233
234	TAUGSURF(NW,NG) = TAUGSURF(NW,NG) + TAUGAS + DCONT
235	DTAUKV(K,nw,ng) = TAUGAS &
236	+ DRAYAER & ! DRAYAER includes all scattering contributions
237	+ DCONT ! For parameterized continuum aborption
238
239	end do
240
241	! Now fill in the "clear" part of the spectrum (NG = L_NGAUSS),
242	! which holds continuum opacity only
243
244	NG = L_NGAUSS
245	DTAUKV(K,nw,ng) = DRAYAER + DCONT ! Scattering + parameterized continuum absorption, including Titan's haze
246
247	end do
248	end do
249
250
251	!=======================================================================
252	! Now the full treatment for the layers, where besides the opacity
253	! we need to calculate the scattering albedo and asymmetry factors
254
255	! Haze scattering
256	DO NW=1,L_NSPECTV
257	DO K=2,L_LEVELS
258	DHAZES_T(K,NW) = DHAZE_T(K,NW) * SSA_T(K,NW) ! effect of scattering albedo on haze
259	ENDDO
260	ENDDO
261
262
263	DO NW=1,L_NSPECTV
264	DO L=1,L_NLAYRAD-1
265	K = 2*L+1
266	atemp(L,NW) = ASF_T(K,NW)DHAZES_T(K,NW) + ASF_T(K+1,NW)DHAZES_T(K+1,NW)
267	btemp(L,NW) = DHAZES_T(K,NW) + DHAZES_T(K+1,NW)
268	ctemp(L,NW) = btemp(L,NW) + 0.9999*(TRAY(K,NW) + TRAY(K+1,NW)) ! JVO 2017 : does this 0.999 is really meaningful ?
269	btemp(L,NW) = btemp(L,NW) + TRAY(K,NW) + TRAY(K+1,NW)
270	COSBV(L,NW,1:L_NGAUSS) = atemp(L,NW)/btemp(L,NW)
271	END DO ! L vertical loop
272
273	! Last level
274	L = L_NLAYRAD
275	K = 2*L+1
276	atemp(L,NW) = ASF_T(K,NW)*DHAZES_T(K,NW)
277	btemp(L,NW) = DHAZES_T(K,NW)
278	ctemp(L,NW) = btemp(L,NW) + 0.9999*TRAY(K,NW) ! JVO 2017 : does this 0.999 is really meaningful ?
279	btemp(L,NW) = btemp(L,NW) + TRAY(K,NW)
280	COSBV(L,NW,1:L_NGAUSS) = atemp(L,NW)/btemp(L,NW)
281
282
283	END DO ! NW spectral loop
284
285	DO NG=1,L_NGAUSS
286	DO NW=1,L_NSPECTV
287	DO L=1,L_NLAYRAD-1
288
289	K = 2*L+1
290	DTAUV(L,nw,ng) = DTAUKV(K,NW,NG) + DTAUKV(K+1,NW,NG)
291	WBARV(L,nw,ng) = ctemp(L,NW) / DTAUV(L,nw,ng)
292
293	END DO ! L vertical loop
294
295	! Last level
296
297	L = L_NLAYRAD
298	K = 2*L+1
299	DTAUV(L,nw,ng) = DTAUKV(K,NW,NG)
300
301	WBARV(L,NW,NG) = ctemp(L,NW) / DTAUV(L,NW,NG)
302
303	END DO ! NW spectral loop
304	END DO ! NG Gauss loop
305
306	! Total extinction optical depths
307
308	DO NG=1,L_NGAUSS ! full gauss loop
309	DO NW=1,L_NSPECTV
310	TAUV(1,NW,NG)=0.0D0
311	DO L=1,L_NLAYRAD
312	TAUV(L+1,NW,NG)=TAUV(L,NW,NG)+DTAUV(L,NW,NG)
313	END DO
314
315	TAUCUMV(1,NW,NG)=0.0D0
316	DO K=2,L_LEVELS
317	TAUCUMV(K,NW,NG)=TAUCUMV(K-1,NW,NG)+DTAUKV(K,NW,NG)
318	END DO
319	END DO
320	END DO ! end full gauss loop
321
322
323	! Titan's outputs (JVO, 2016)===============================================
324	! do l=1,L_NLAYRAD
325	! do nw=1,L_NSPECTV
326	! INT_DTAU(L,NW) = 0.0d+0
327	! DO NG=1,L_NGAUSS
328	! INT_DTAU(L,NW)= INT_DTAU(L,NW) + dtauv(L,nw,ng)*gweight(NG)
329	! enddo
330	! enddo
331	! enddo
332
333	! do nw=1,L_NSPECTV
334	! write(str2,'(i2.2)') nw
335	! call writediagfi(1,'kgv'//str2,'Gaz extinction coefficient VI band '//str2,'m-1',1,int_dtau(L_NLAYRAD:1:-1,nw)/dz_lay(L_NLAYRAD:1:-1))
336	! call writediagfi(1,'khv'//str2,'Haze extinction coefficient VI band '//str2,'m-1',1,k_haze(L_NLAYRAD:1:-1,nw)/dz_lay(L_NLAYRAD:1:-1))
337	! enddo
338
339	! ==============================================================================
340
341
342	return
343
344
345	end subroutine optcv

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