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optcv.F90 @ 3090

Last change on this file since 3090 was 3090, checked in by slebonnois, 13 months ago
BdeBatz? : Cleans microphysics and makes few corrections for physics
Property svn:executable set to ``*
File size: 21.6 KB

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1	SUBROUTINE OPTCV(PQMO,NLAY,ZLEV,PLEV,TMID,PMID, &
2	DTAUV,TAUV,TAUCUMV,WBARV,COSBV,TAURAY,TAUGSURF,SEASHAZEFACT,&
3	POPT_HAZE,POPT_CLOUDS,CDCOLUMN)
4
5	use radinc_h
6	use radcommon_h, only: gasv,gasv_recomb,tlimit,Cmk,gzlat_ig, &
7	tgasref,pfgasref,wnov,scalep,indv
8	use gases_h
9	use datafile_mod, only: haze_opt_file
10	use comcstfi_mod, only: pi,r
11	use callkeys_mod, only: continuum,graybody,callgasvis,corrk_recombin, &
12	callclouds,callmufi,seashaze,uncoupl_optic_haze,&
13	opt4clouds,FHVIS, Fssa
14	use tracer_h, only: nmicro,nice,ices_indx
15
16	implicit none
17
18	!==================================================================
19	!
20	! Purpose
21	! -------
22	! Calculates shortwave optical constants at each level.
23	!
24	! Authors
25	! -------
26	! Adapted from the NASA Ames code by R. Wordsworth (2009)
27	!
28	! Modified
29	! --------
30	! J. Vatant d'Ollone (2016-17)
31	! --> Clean and adaptation to Titan
32	! B. de Batz de Trenquelléon (2022-2023)
33	! --> Clean and correction to Titan
34	! --> New optics added for Titan's clouds
35	!
36	!==================================================================
37	!
38	! THIS SUBROUTINE SETS THE OPTICAL CONSTANTS IN THE VISUAL
39	! IT CALCULATES FOR EACH LAYER, FOR EACH SPECTRAL INTERVAL IN THE VISUAL
40	! LAYER: WBAR, DTAU, COSBAR
41	! LEVEL: TAU
42	!
43	! TAUV(L,NW,NG) is the cumulative optical depth at the top of radiation code
44	! layer L. NW is spectral wavelength interval, ng the Gauss point index.
45	!
46	! TLEV(L) - Temperature at the layer boundary
47	! PLEV(L) - Pressure at the layer boundary (i.e. level)
48	! GASV(NT,NPS,NW,NG) - Visible k-coefficients
49	!
50	!-------------------------------------------------------------------
51
52
53	!==========================================================
54	! Input/Output
55	!==========================================================
56	REAL*8, INTENT(IN) :: PQMO(nlay,nmicro) ! Tracers for microphysics optics (X/m2).
57	INTEGER, INTENT(IN) :: NLAY ! Number of pressure layers (for pqmo)
58	REAL*8, INTENT(IN) :: ZLEV(NLAY+1)
59	REAL*8, INTENT(IN) :: PLEV(L_LEVELS)
60	REAL*8, INTENT(IN) :: TMID(L_LEVELS), PMID(L_LEVELS)
61	REAL*8, INTENT(IN) :: TAURAY(L_NSPECTV)
62	REAL*8, INTENT(IN) :: SEASHAZEFACT(L_LEVELS)
63	INTEGER, INTENT(IN) :: CDCOLUMN
64
65	REAL*8, INTENT(OUT) :: DTAUV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
66	REAL*8, INTENT(OUT) :: TAUV(L_NLEVRAD,L_NSPECTV,L_NGAUSS)
67	REAL*8, INTENT(OUT) :: TAUCUMV(L_LEVELS,L_NSPECTV,L_NGAUSS)
68	REAL*8, INTENT(OUT) :: COSBV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
69	REAL*8, INTENT(OUT) :: WBARV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
70	REAL*8, INTENT(OUT) :: TAUGSURF(L_NSPECTV,L_NGAUSS-1)
71	REAL*8, INTENT(OUT) :: POPT_HAZE(L_LEVELS,L_NSPECTI,3)
72	REAL*8, INTENT(OUT) :: POPT_CLOUDS(L_LEVELS,L_NSPECTI,3)
73	! ==========================================================
74
75	real*8 DTAUKV(L_LEVELS,L_NSPECTV,L_NGAUSS)
76
77	! Titan customisation
78	! J. Vatant d'Ollone (2016)
79	real*8 DHAZE_T(L_LEVELS,L_NSPECTV)
80	real*8 DHAZES_T(L_LEVELS,L_NSPECTV)
81	real*8 SSA_T(L_LEVELS,L_NSPECTV)
82	real*8 ASF_T(L_LEVELS,L_NSPECTV)
83	! ==========================
84
85	integer L, NW, NG, K, LK, IAER
86	integer MT(L_LEVELS), MP(L_LEVELS), NP(L_LEVELS)
87	real*8 ANS, TAUGAS
88	real*8 TRAY(L_LEVELS,L_NSPECTV)
89	real*8 DPR(L_LEVELS), U(L_LEVELS)
90	real*8 LCOEF(4), LKCOEF(L_LEVELS,4)
91
92	real*8 DCONT
93	real*8 DRAYAER
94	double precision wn_cont, p_cont, p_air, T_cont, dtemp, dtempc
95	double precision p_cross
96
97	real*8 KCOEF(4)
98
99	! temporary variable to reduce memory access time to gasv
100	real*8 tmpk(2,2)
101
102	! temporary variables for multiple aerosol calculation
103	real*8 atemp(L_NLAYRAD,L_NSPECTV)
104	real*8 btemp(L_NLAYRAD,L_NSPECTV)
105	real*8 ctemp(L_NLAYRAD,L_NSPECTV)
106
107	! variables for k in units m^-1
108	real*8 dz(L_LEVELS)
109
110	integer igas, jgas, ilay
111
112	integer interm
113
114	! Variables for haze optics
115	character(len=200) file_path
116	logical file_ok
117	integer dumch
118	real*8 dumwvl
119
120	! Variables for new optics
121	integer iq, iw, FTYPE, CTYPE
122	real*8 m0as,m0af,m0ccn,m3as,m3af,m3ccn,m3cld
123	real*8 dtauaer_s,dtauaer_f,dtau_ccn,dtau_cld
124	real*8,save :: rhoaer_s(L_NSPECTV),ssa_s(L_NSPECTV),asf_s(L_NSPECTV)
125	real*8,save :: rhoaer_f(L_NSPECTV),ssa_f(L_NSPECTV),asf_f(L_NSPECTV)
126	real*8,save :: ssa_ccn(L_NSPECTI),asf_ccn(L_NSPECTI)
127	real*8,save :: ssa_cld(L_NSPECTV),asf_cld(L_NSPECTV)
128	!$OMP THREADPRIVATE(rhoaer_s,rhoaer_f,ssa_s,ssa_f,ssa_cld,asf_s,asf_f,asf_cld)
129
130	logical,save :: firstcall=.true.
131	!$OMP THREADPRIVATE(firstcall)
132
133
134	!! AS: to save time in computing continuum (see bilinearbig)
135	IF (.not.ALLOCATED(indv)) THEN
136	ALLOCATE(indv(L_NSPECTV,ngasmx,ngasmx))
137	indv = -9999 ! this initial value means "to be calculated"
138	ENDIF
139
140	! Some initialisation beacause there's a pb with disr_haze at the limits (nw=1)
141	! I should check this - For now we set vars to zero : better than nans - JVO 2017
142	DHAZE_T(:,:) = 0.0
143	SSA_T(:,:) = 0.0
144	ASF_T(:,:) = 0.0
145
146	! Load tabulated haze optical properties if needed.
147	! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
148	IF (firstcall .AND. callmufi .AND. (.NOT. uncoupl_optic_haze)) THEN
149	OPEN(12,file=TRIM(haze_opt_file),form='formatted') ! The file has been inquired in physiq_mod firstcall
150	READ(12,*) ! dummy header
151	DO NW=1,L_NSPECTI
152	READ(12,*) ! there's IR 1st
153	ENDDO
154	DO NW=1,L_NSPECTV
155	READ(12,*) dumch, dumwvl, rhoaer_f(nw), ssa_f(nw), asf_f(nw), rhoaer_s(nw), ssa_s(nw), asf_s(nw)
156	ENDDO
157	CLOSE(12)
158	ENDIF
159
160	!=======================================================================
161	! Determine the total gas opacity throughout the column, for each
162	! spectral interval, NW, and each Gauss point, NG.
163	! Calculate the continuum opacities, i.e., those that do not depend on
164	! NG, the Gauss index.
165
166	taugsurf(:,:) = 0.0
167	dpr(:) = 0.0
168	lkcoef(:,:) = 0.0
169
170	do K=2,L_LEVELS
171	ilay = L_NLAYRAD+1 - k/2 ! int. arithmetic => gives the gcm layer index (reversed)
172	DPR(k) = PLEV(K)-PLEV(K-1)
173
174	! if we have continuum opacities, we need dz
175	dz(k) = dpr(k)RTMID(K)/(gzlat_ig(ilay)*PMID(K))
176	U(k) = Cmk(ilay)*DPR(k) ! only Cmk line in optcv.F
177
178	call tpindex(PMID(K),TMID(K),pfgasref,tgasref,LCOEF,MT(K),MP(K))
179
180	do LK=1,4
181	LKCOEF(K,LK) = LCOEF(LK)
182	end do
183	end do ! L_LEVELS
184
185	! Rayleigh scattering
186	do NW=1,L_NSPECTV
187	TRAY(1:4,NW) = 1.d-30
188	do K=5,L_LEVELS
189	TRAY(K,NW) = TAURAY(NW) * DPR(K)
190	end do ! L_LEVELS
191	end do
192
193	do NW=1,L_NSPECTV
194	! We ignore K=1...
195	do K=2,L_LEVELS
196	! int. arithmetic => gives the gcm layer index (reversed)
197	ilay = L_NLAYRAD+1 - k/2
198
199	! Optics coupled with the microphysics :
200	IF (callmufi .AND. (.NOT. uncoupl_optic_haze)) THEN
201
202	!==========================================================================================
203	! Old optics (must have callclouds = .false.):
204	!==========================================================================================
205	IF (.NOT. opt4clouds) THEN
206	m3as = pqmo(ilay,2) / 2.0
207	m3af = pqmo(ilay,4) / 2.0
208	! Cut-off (here for p = 2.7e3Pa / alt = 70km)
209	IF (ilay .lt. 23) THEN
210	m3as = pqmo(23,2) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
211	m3af = pqmo(23,4) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
212	ENDIF
213
214	dtauaer_s = m3as*rhoaer_s(nw)
215	dtauaer_f = m3af*rhoaer_f(nw)
216
217	!==========================================================================================
218	! New optics :
219	!==========================================================================================
220	ELSE
221	iw = (L_NSPECTV + 1) - NW ! Visible first and return
222	!-----------------------------
223	! HAZE (Spherical + Fractal) :
224	!-----------------------------
225	FTYPE = 1
226
227	! Spherical aerosols :
228	!---------------------
229	CTYPE = 5
230	m0as = pqmo(ilay,1) / 2.0
231	m3as = pqmo(ilay,2) / 2.0
232	! If not callclouds : must have a cut-off (here for p = 2.7e3Pa / alt = 70km)
233	IF (.NOT. callclouds) THEN
234	IF (ilay .lt. 23) THEN
235	m0as = pqmo(23,1) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
236	m3as = pqmo(23,2) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
237	ENDIF
238	ENDIF
239	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0as,m3as,iw,dtauaer_s,ssa_s(nw),asf_s(nw))
240
241	! Fractal aerosols :
242	!-------------------
243	CTYPE = FTYPE
244	m0af = pqmo(ilay,3) / 2.0
245	m3af = pqmo(ilay,4) / 2.0
246	! If not callclouds : must have a cut-off (here for p = 2.7e3Pa / alt = 70km)
247	IF (.NOT. callclouds) THEN
248	IF (ilay .lt. 23) THEN
249	m0af = pqmo(23,3) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
250	m3af = pqmo(23,4) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
251	ENDIF
252	ENDIF
253	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0af,m3af,iw,dtauaer_f,ssa_f(nw),asf_f(nw))
254	ENDIF
255
256	! Total of Haze opacity (dtau), SSA (w) and ASF (COS) :
257	DHAZE_T(k,nw) = dtauaer_s + dtauaer_f
258	IF (dtauaer_s + dtauaer_f .GT. 1.D-30) THEN
259	SSA_T(k,nw) = ( dtauaer_sssa_s(nw) + dtauaer_fssa_f(nw) ) / ( dtauaer_s+dtauaer_f )
260	ASF_T(k,nw) = ( dtauaer_sssa_s(nw)asf_s(nw) + dtauaer_fssa_f(nw)asf_f(nw) ) &
261	/ ( ssa_s(nw)dtauaer_s + ssa_f(nw)dtauaer_f )
262	ELSE
263	DHAZE_T(k,nw) = 0.D0
264	SSA_T(k,nw) = 1.0
265	ASF_T(k,nw) = 1.0
266	ENDIF
267	! Diagnostics for the haze :
268	POPT_HAZE(k,nw,1) = DHAZE_T(k,nw) ! dtau
269	POPT_HAZE(k,nw,2) = SSA_T(k,nw) ! wbar
270	POPT_HAZE(k,nw,3) = ASF_T(k,nw) ! gbar
271
272	!---------------------
273	! CLOUDS (Spherical) :
274	!---------------------
275	IF (callclouds) THEN
276	CTYPE = 0
277	m0ccn = pqmo(ilay,5) / 2.0
278	m3ccn = pqmo(ilay,6) / 2.0
279	m3cld = 0.0d0
280
281	! Clear / Dark column method :
282	!-----------------------------
283
284	! CCN's SSA :
285	call get_haze_and_cloud_opacity(FTYPE,FTYPE,m0ccn,m3ccn,iw,dtau_ccn,ssa_ccn(nw),asf_ccn(nw))
286
287	! Clear column (CCN, C2H2, C2H6, HCN) :
288	IF (CDCOLUMN == 0) THEN
289	DO iq = 2, nice
290	m3cld = m3cld + (pqmo(ilay,ices_indx(iq)) / 2.0)
291	ENDDO
292	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0ccn,m3cld,iw,dtau_cld,ssa_cld(nw),asf_cld(nw))
293
294	! Dark column (CCN, CH4, C2H2, C2H6, HCN) :
295	ELSEIF (CDCOLUMN == 1) THEN
296	DO iq = 1, nice
297	m3cld = m3cld + (pqmo(ilay,ices_indx(iq)) / 2.0)
298	ENDDO
299	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0ccn,m3cld,iw,dtau_cld,ssa_cld(nw),asf_cld(nw))
300
301	ELSE
302	WRITE(,) 'WARNING OPTCV.F90 : CDCOLUMN MUST BE 0 OR 1'
303	WRITE(,) 'WE USE DARK COLUMN ...'
304	DO iq = 1, nice
305	m3cld = m3cld + (pqmo(ilay,ices_indx(iq)) / 2.0)
306	ENDDO
307	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0ccn,m3cld,iw,dtau_cld,ssa_cld(nw),asf_cld(nw))
308	ENDIF
309
310	! For small dropplets, opacity of nucleus dominates
311	ssa_cld(nw) = (ssa_ccn(nw)m3ccn + ssa_cld(nw)m3cld) / (m3ccn + m3cld)
312	ssa_cld(nw) = ssa_cld(nw) * Fssa
313
314	! Total of Haze + Clouds opacity (dtau), SSA (w) and ASF (COS) :
315	DHAZE_T(k,nw) = dtauaer_s + dtauaer_f + dtau_cld
316	IF (DHAZE_T(k,nw) .GT. 1.D-30) THEN
317	SSA_T(k,nw) = ( dtauaer_sssa_s(nw) + dtauaer_fssa_f(nw) + dtau_cld*ssa_cld(nw) ) / ( dtauaer_s+dtauaer_f+dtau_cld )
318	ASF_T(k,nw) = ( dtauaer_sssa_s(nw)asf_s(nw) + dtauaer_fssa_f(nw)asf_f(nw) + dtau_cldssa_cld(nw)asf_cld(nw) ) &
319	/ ( ssa_s(nw)dtauaer_s + ssa_f(nw)dtauaer_f + ssa_cld(nw)*dtau_cld )
320	ELSE
321	DHAZE_T(k,nw) = 0.D0
322	SSA_T(k,nw) = 1.0
323	ASF_T(k,nw) = 1.0
324	ENDIF
325
326	! Tuning of optical properties (now useless...) :
327	DHAZE_T(k,nw) = DHAZE_T(k,nw) * (FHVIS * (1-SSA_T(k,nw)) + SSA_T(k,nw))
328	SSA_T(k,nw) = SSA_T(k,nw) / (FHVIS * (1-SSA_T(k,nw)) + SSA_T(k,nw))
329
330	! Diagnostics for clouds :
331	POPT_CLOUDS(k,nw,1) = DHAZE_T(k,nw) ! dtau
332	POPT_CLOUDS(k,nw,2) = SSA_T(k,nw) ! wbar
333	POPT_CLOUDS(k,nw,3) = ASF_T(k,nw) ! gbar
334
335	ELSE
336	! Diagnostics for clouds :
337	POPT_CLOUDS(k,nw,1) = 0.D0 ! dtau
338	POPT_CLOUDS(k,nw,2) = 1.0 ! wbar
339	POPT_CLOUDS(k,nw,3) = 1.0 ! gbar
340	ENDIF
341
342	! Optics and microphysics no coupled :
343	ELSE
344	! Call fixed vertical haze profile of extinction - same for all columns
345	call disr_haze(dz(k),plev(k),wnov(nw),DHAZE_T(k,nw),SSA_T(k,nw),ASF_T(k,nw))
346	if (seashaze) DHAZE_T(k,nw) = DHAZE_T(k,nw)*seashazefact(k)
347	! Diagnostics for the haze :
348	POPT_HAZE(k,nw,1) = DHAZE_T(k,nw) ! dtau
349	POPT_HAZE(k,nw,2) = SSA_T(k,nw) ! wbar
350	POPT_HAZE(k,nw,3) = ASF_T(k,nw) ! gbar
351	! Diagnostics for clouds :
352	POPT_CLOUDS(k,nw,1) = 0.D0 ! dtau
353	POPT_CLOUDS(k,nw,2) = 1.0 ! wbar
354	POPT_CLOUDS(k,nw,3) = 1.0 ! gbar
355	ENDIF ! ENDIF callmufi
356
357	!JL18 It seems to be good to have aerosols in the first "radiative layer" of the gcm in the IR
358	! but visible does not handle very well diffusion in first layer.
359	! The tauaero and tauray are thus set to 0 (a small value for rayleigh because the code crashes otherwise)
360	! in the 4 first semilayers in optcv, but not optci.
361	! This solves random variations of the sw heating at the model top.
362	if (k<5) DHAZE_T(K,:) = 0.0
363
364	DRAYAER = TRAY(K,NW)
365	! DRAYAER is Tau RAYleigh scattering, plus AERosol opacity
366	DRAYAER = DRAYAER + DHAZE_T(K,NW) ! Titan's aerosol
367
368	DCONT = 0.0 ! continuum absorption
369
370	if(continuum.and.(.not.graybody).and.callgasvis)then
371	! include continua if necessary
372	wn_cont = dble(wnov(nw))
373	T_cont = dble(TMID(k))
374	do igas=1,ngasmx
375
376	p_cont = dble(PMID(k)scalepgfrac(igas,ilay))
377
378	dtemp=0.0
379	if(igas.eq.igas_N2)then
380
381	interm = indv(nw,igas,igas)
382	! call interpolateN2N2(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
383	indv(nw,igas,igas) = interm
384	! only goes to 500 cm^-1, so unless we're around a cold brown dwarf, this is irrelevant in the visible
385
386	elseif(igas.eq.igas_H2)then
387
388	! first do self-induced absorption
389	interm = indv(nw,igas,igas)
390	call interpolateH2H2(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
391	indv(nw,igas,igas) = interm
392
393	! then cross-interactions with other gases
394	do jgas=1,ngasmx
395	p_cross = dble(PMID(k)scalepgfrac(jgas,ilay))
396	dtempc = 0.0
397	if(jgas.eq.igas_N2)then
398	interm = indv(nw,igas,jgas)
399	call interpolateN2H2(wn_cont,T_cont,p_cross,p_cont,dtempc,.false.,interm)
400	indv(nw,igas,jgas) = interm
401	! should be irrelevant in the visible
402	endif
403	dtemp = dtemp + dtempc
404	enddo
405
406	elseif(igas.eq.igas_CH4)then
407
408	! first do self-induced absorption
409	interm = indv(nw,igas,igas)
410	call interpolateCH4CH4(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
411	indv(nw,igas,igas) = interm
412
413	! then cross-interactions with other gases
414	do jgas=1,ngasmx
415	p_cross = dble(PMID(k)scalepgfrac(jgas,ilay))
416	dtempc = 0.0
417	if(jgas.eq.igas_N2)then
418	interm = indv(nw,igas,jgas)
419	call interpolateN2CH4(wn_cont,T_cont,p_cross,p_cont,dtempc,.false.,interm)
420	indv(nw,igas,jgas) = interm
421	endif
422	dtemp = dtemp + dtempc
423	enddo
424
425	endif
426
427	DCONT = DCONT + dtemp
428
429	enddo
430
431	DCONT = DCONT*dz(k)
432
433	endif
434
435	do ng=1,L_NGAUSS-1
436
437	! Now compute TAUGAS
438
439	! JVO 2017 : added tmpk because the repeated calls to gasi/v increased dramatically
440	! the execution time of optci/v -> ~ factor 2 on the whole radiative
441	! transfer on the tested simulations !
442
443	if (corrk_recombin) then
444	tmpk = GASV_RECOMB(MT(K):MT(K)+1,MP(K):MP(K)+1,NW,NG)
445	else
446	tmpk = GASV(MT(K):MT(K)+1,MP(K):MP(K)+1,1,NW,NG)
447	endif
448
449	KCOEF(1) = tmpk(1,1) ! KCOEF(1) = GASV(MT(K),MP(K),1,NW,NG)
450	KCOEF(2) = tmpk(1,2) ! KCOEF(2) = GASV(MT(K),MP(K)+1,1,NW,NG)
451	KCOEF(3) = tmpk(2,2) ! KCOEF(3) = GASV(MT(K)+1,MP(K)+1,1,NW,NG)
452	KCOEF(4) = tmpk(2,1) ! KCOEF(4) = GASV(MT(K)+1,MP(K),1,NW,NG)
453
454	! Interpolate the gaseous k-coefficients to the requested T,P values
455
456	ANS = LKCOEF(K,1)KCOEF(1) + LKCOEF(K,2)KCOEF(2) + &
457	LKCOEF(K,3)KCOEF(3) + LKCOEF(K,4)KCOEF(4)
458
459
460	TAUGAS = U(k)*ANS
461
462	TAUGSURF(NW,NG) = TAUGSURF(NW,NG) + TAUGAS + DCONT
463	DTAUKV(K,nw,ng) = TAUGAS &
464	+ DRAYAER & ! DRAYAER includes all scattering contributions
465	+ DCONT ! For parameterized continuum aborption
466	end do
467
468	! Now fill in the "clear" part of the spectrum (NG = L_NGAUSS),
469	! which holds continuum opacity only
470
471	NG = L_NGAUSS
472	DTAUKV(K,nw,ng) = DRAYAER + DCONT ! Scattering + parameterized continuum absorption, including Titan's haze
473
474	end do ! k = L_LEVELS
475	end do ! nw = L_NSPECTI
476
477	!=======================================================================
478	! Now the full treatment for the layers, where besides the opacity
479	! we need to calculate the scattering albedo and asymmetry factors
480	! ======================================================================
481
482	! Haze scattering
483	!JL18 It seems to be good to have aerosols in the first "radiative layer" of the gcm in the IR
484	! but not in the visible
485	! The dhaze_s is thus set to 0 in the 4 first semilayers in optcv, but not optci.
486	! This solves random variations of the sw heating at the model top.
487	DO NW=1,L_NSPECTV
488	DHAZES_T(1:4,NW) = 0.d0
489	DO K=5,L_LEVELS
490	DHAZES_T(K,NW) = DHAZE_T(K,NW) * SSA_T(K,NW) ! effect of scattering albedo on haze
491	ENDDO
492	ENDDO
493
494	! NW spectral loop
495	DO NW=1,L_NSPECTV
496	! L vertical loop
497	DO L=1,L_NLAYRAD-1
498	K = 2*L+1
499	atemp(L,NW) = ASF_T(K,NW)DHAZES_T(K,NW) + ASF_T(K+1,NW)DHAZES_T(K+1,NW)
500	btemp(L,NW) = DHAZES_T(K,NW) + DHAZES_T(K+1,NW)
501	ctemp(L,NW) = btemp(L,NW) + 0.9999*(TRAY(K,NW) + TRAY(K+1,NW)) ! JVO 2017 : does this 0.999 is really meaningful ?
502	btemp(L,NW) = btemp(L,NW) + TRAY(K,NW) + TRAY(K+1,NW)
503	COSBV(L,NW,1:L_NGAUSS) = atemp(L,NW)/btemp(L,NW)
504	END DO
505
506	! Last level
507	L = L_NLAYRAD
508	K = 2*L+1
509	atemp(L,NW) = ASF_T(K,NW)*DHAZES_T(K,NW)
510	btemp(L,NW) = DHAZES_T(K,NW)
511	ctemp(L,NW) = btemp(L,NW) + 0.9999*TRAY(K,NW) ! JVO 2017 : does this 0.999 is really meaningful ?
512	btemp(L,NW) = btemp(L,NW) + TRAY(K,NW)
513	COSBV(L,NW,1:L_NGAUSS) = atemp(L,NW)/btemp(L,NW)
514	END DO
515
516	! NG Gauss loop
517	DO NG=1,L_NGAUSS
518	! NW spectral loop
519	DO NW=1,L_NSPECTV
520	! L vertical loop
521	DO L=1,L_NLAYRAD-1
522	K = 2*L+1
523	DTAUV(L,nw,ng) = DTAUKV(K,NW,NG) + DTAUKV(K+1,NW,NG)
524	WBARV(L,nw,ng) = ctemp(L,NW) / DTAUV(L,nw,ng)
525	END DO
526
527	! Last level
528	L = L_NLAYRAD
529	K = 2*L+1
530	DTAUV(L,nw,ng) = DTAUKV(K,NW,NG)
531	WBARV(L,NW,NG) = ctemp(L,NW) / DTAUV(L,NW,NG)
532	END DO
533	END DO
534
535	! Total extinction optical depths
536	!DO NG=1,L_NGAUSS ! full gauss loop
537	! DO NW=1,L_NSPECTV
538	! TAUCUMV(1,NW,NG)=0.0D0
539	! DO K=2,L_LEVELS
540	! TAUCUMV(K,NW,NG)=TAUCUMV(K-1,NW,NG)+DTAUKV(K,NW,NG)
541	! END DO
542	! DO L=1,L_NLAYRAD
543	! TAUV(L,NW,NG)=TAUCUMV(2*L,NW,NG)
544	! END DO
545	! TAUV(L,NW,NG)=TAUCUMV(2*L_NLAYRAD+1,NW,NG)
546	! END DO
547	!END DO ! end full gauss loop
548
549	TAUCUMV(:,:,:) = DTAUKV(:,:,:)
550	DO L=1,L_NLAYRAD
551	TAUV(L,:,:)=TAUCUMV(2*L,:,:)
552	END DO
553	TAUV(L,:,:)=TAUCUMV(2*L_NLAYRAD+1,:,:)
554
555	if(firstcall) firstcall = .false.
556
557	return
558
559
560	end subroutine optcv

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