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optcv.F90 @ 3318

Last change on this file since 3318 was 3318, checked in by slebonnois, 7 months ago
Titan PCM update : optics + microphysics
Property svn:executable set to ``*
File size: 22.2 KB

Rev	Line
[3083]	1	SUBROUTINE OPTCV(PQMO,NLAY,ZLEV,PLEV,TMID,PMID, &
	2	DTAUV,TAUV,TAUCUMV,WBARV,COSBV,TAURAY,TAUGSURF,SEASHAZEFACT,&
[3318]	3	DIAG_OPTH,DIAG_OPTT,CDCOLUMN)
[253]	4
[716]	5	use radinc_h
[2050]	6	use radcommon_h, only: gasv,gasv_recomb,tlimit,Cmk,gzlat_ig, &
[2133]	7	tgasref,pfgasref,wnov,scalep,indv
[716]	8	use gases_h
[2242]	9	use datafile_mod, only: haze_opt_file
[3083]	10	use comcstfi_mod, only: pi,r
	11	use callkeys_mod, only: continuum,graybody,callgasvis,corrk_recombin, &
	12	callclouds,callmufi,seashaze,uncoupl_optic_haze,&
[3318]	13	opt4clouds,FHVIS,FCVIS
[3083]	14	use tracer_h, only: nmicro,nice,ices_indx
[253]	15
[716]	16	implicit none
[253]	17
[716]	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	!
[3090]	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	!
[716]	36	!==================================================================
	37	!
	38	! THIS SUBROUTINE SETS THE OPTICAL CONSTANTS IN THE VISUAL
[1722]	39	! IT CALCULATES FOR EACH LAYER, FOR EACH SPECTRAL INTERVAL IN THE VISUAL
[716]	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	!-------------------------------------------------------------------
[253]	51
	52
[1822]	53	!==========================================================
	54	! Input/Output
	55	!==========================================================
[2050]	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)
[3083]	58	REAL*8, INTENT(IN) :: ZLEV(NLAY+1)
[1822]	59	REAL*8, INTENT(IN) :: PLEV(L_LEVELS)
	60	REAL*8, INTENT(IN) :: TMID(L_LEVELS), PMID(L_LEVELS)
[1826]	61	REAL*8, INTENT(IN) :: TAURAY(L_NSPECTV)
[2046]	62	REAL*8, INTENT(IN) :: SEASHAZEFACT(L_LEVELS)
[3083]	63	INTEGER, INTENT(IN) :: CDCOLUMN
[1822]	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)
[1823]	70	REAL*8, INTENT(OUT) :: TAUGSURF(L_NSPECTV,L_NGAUSS-1)
[3318]	71	REAL*8, INTENT(OUT) :: DIAG_OPTH(L_LEVELS,L_NSPECTV,6)
	72	REAL*8, INTENT(OUT) :: DIAG_OPTT(L_LEVELS,L_NSPECTV,6)
[1822]	73	! ==========================================================
	74
[1722]	75	real*8 DTAUKV(L_LEVELS,L_NSPECTV,L_NGAUSS)
[253]	76
[1648]	77	! Titan customisation
	78	! J. Vatant d'Ollone (2016)
[3083]	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)
[1648]	83	! ==========================
	84
[873]	85	integer L, NW, NG, K, LK, IAER
[716]	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)
[253]	91
[1788]	92	real*8 DCONT
[1722]	93	real*8 DRAYAER
[873]	94	double precision wn_cont, p_cont, p_air, T_cont, dtemp, dtempc
	95	double precision p_cross
[253]	96
[873]	97	real*8 KCOEF(4)
[1725]	98
	99	! temporary variable to reduce memory access time to gasv
	100	real*8 tmpk(2,2)
[253]	101
[716]	102	! temporary variables for multiple aerosol calculation
[918]	103	real*8 atemp(L_NLAYRAD,L_NSPECTV)
	104	real*8 btemp(L_NLAYRAD,L_NSPECTV)
	105	real*8 ctemp(L_NLAYRAD,L_NSPECTV)
[253]	106
[716]	107	! variables for k in units m^-1
[873]	108	real*8 dz(L_LEVELS)
[253]	109
[1648]	110	integer igas, jgas, ilay
[253]	111
[873]	112	integer interm
	113
[2242]	114	! Variables for haze optics
	115	character(len=200) file_path
	116	logical file_ok
	117	integer dumch
	118	real*8 dumwvl
	119
[3083]	120	! Variables for new optics
	121	integer iq, iw, FTYPE, CTYPE
[3090]	122	real*8 m0as,m0af,m0ccn,m3as,m3af,m3ccn,m3cld
[3083]	123	real*8 dtauaer_s,dtauaer_f,dtau_ccn,dtau_cld
[2242]	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)
[3318]	126	real*8,save :: ssa_ccn(L_NSPECTV),asf_ccn(L_NSPECTV)
[3083]	127	real*8,save :: ssa_cld(L_NSPECTV),asf_cld(L_NSPECTV)
	128	!$OMP THREADPRIVATE(rhoaer_s,rhoaer_f,ssa_s,ssa_f,ssa_cld,asf_s,asf_f,asf_cld)
[2242]	129
[1897]	130	logical,save :: firstcall=.true.
[2242]	131	!$OMP THREADPRIVATE(firstcall)
[1897]	132
	133
[873]	134	!! AS: to save time in computing continuum (see bilinearbig)
	135	IF (.not.ALLOCATED(indv)) THEN
[878]	136	ALLOCATE(indv(L_NSPECTV,ngasmx,ngasmx))
[873]	137	indv = -9999 ! this initial value means "to be calculated"
	138	ENDIF
[1792]	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
[2242]	142	DHAZE_T(:,:) = 0.0
	143	SSA_T(:,:) = 0.0
	144	ASF_T(:,:) = 0.0
[1792]	145
[2242]	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
[873]	159
[3083]	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.
[253]	165
[3083]	166	taugsurf(:,:) = 0.0
	167	dpr(:) = 0.0
	168	lkcoef(:,:) = 0.0
[253]	169
[3083]	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)
[253]	173
[3083]	174	! if we have continuum opacities, we need dz
[1947]	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
[1647]	177
[3083]	178	call tpindex(PMID(K),TMID(K),pfgasref,tgasref,LCOEF,MT(K),MP(K))
[253]	179
[3083]	180	do LK=1,4
	181	LKCOEF(K,LK) = LCOEF(LK)
	182	end do
	183	end do ! L_LEVELS
[253]	184
[3083]	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
[1722]	192
[3318]	193	DIAG_OPTH(:,:,:) = 0.D0
	194	DIAG_OPTT(:,:,:) = 0.D0
	195
[3083]	196	do NW=1,L_NSPECTV
	197	! We ignore K=1...
	198	do K=2,L_LEVELS
	199	! int. arithmetic => gives the gcm layer index (reversed)
	200	ilay = L_NLAYRAD+1 - k/2
	201
	202	! Optics coupled with the microphysics :
	203	IF (callmufi .AND. (.NOT. uncoupl_optic_haze)) THEN
[873]	204
[3083]	205	!==========================================================================================
	206	! Old optics (must have callclouds = .false.):
	207	!==========================================================================================
	208	IF (.NOT. opt4clouds) THEN
	209	m3as = pqmo(ilay,2) / 2.0
	210	m3af = pqmo(ilay,4) / 2.0
[3090]	211	! Cut-off (here for p = 2.7e3Pa / alt = 70km)
	212	IF (ilay .lt. 23) THEN
	213	m3as = pqmo(23,2) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
	214	m3af = pqmo(23,4) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
[3083]	215	ENDIF
	216
	217	dtauaer_s = m3as*rhoaer_s(nw)
	218	dtauaer_f = m3af*rhoaer_f(nw)
[253]	219
[3083]	220	!==========================================================================================
	221	! New optics :
	222	!==========================================================================================
	223	ELSE
	224	iw = (L_NSPECTV + 1) - NW ! Visible first and return
	225	!-----------------------------
	226	! HAZE (Spherical + Fractal) :
	227	!-----------------------------
	228	FTYPE = 1
[2242]	229
[3083]	230	! Spherical aerosols :
	231	!---------------------
	232	CTYPE = 5
	233	m0as = pqmo(ilay,1) / 2.0
	234	m3as = pqmo(ilay,2) / 2.0
[3090]	235	! If not callclouds : must have a cut-off (here for p = 2.7e3Pa / alt = 70km)
[3083]	236	IF (.NOT. callclouds) THEN
[3090]	237	IF (ilay .lt. 23) THEN
	238	m0as = pqmo(23,1) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
	239	m3as = pqmo(23,2) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
[3083]	240	ENDIF
	241	ENDIF
	242	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0as,m3as,iw,dtauaer_s,ssa_s(nw),asf_s(nw))
[1722]	243
[3083]	244	! Fractal aerosols :
	245	!-------------------
	246	CTYPE = FTYPE
	247	m0af = pqmo(ilay,3) / 2.0
	248	m3af = pqmo(ilay,4) / 2.0
[3090]	249	! If not callclouds : must have a cut-off (here for p = 2.7e3Pa / alt = 70km)
[3083]	250	IF (.NOT. callclouds) THEN
[3090]	251	IF (ilay .lt. 23) THEN
	252	m0af = pqmo(23,3) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
	253	m3af = pqmo(23,4) / 2.0 * (zlev(ilay+1)-zlev(ilay)) / (zlev(24)-zlev(23))
[3083]	254	ENDIF
	255	ENDIF
	256	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0af,m3af,iw,dtauaer_f,ssa_f(nw),asf_f(nw))
	257	ENDIF
[253]	258
[3318]	259	! Tuning of optical properties for haze :
	260	!dtauaer_s = dtauaer_s * (FHVIS * (1-ssa_s(nw)) + ssa_s(nw))
	261	!ssa_s(nw) = ssa_s(nw) / (FHVIS * (1-ssa_s(nw)) + ssa_s(nw))
	262	dtauaer_f = dtauaer_f * (FHVIS * (1-ssa_f(nw)) + ssa_f(nw))
	263	ssa_f(nw) = ssa_f(nw) / (FHVIS * (1-ssa_f(nw)) + ssa_f(nw))
	264
[3083]	265	! Total of Haze opacity (dtau), SSA (w) and ASF (COS) :
	266	DHAZE_T(k,nw) = dtauaer_s + dtauaer_f
	267	IF (dtauaer_s + dtauaer_f .GT. 1.D-30) THEN
	268	SSA_T(k,nw) = ( dtauaer_sssa_s(nw) + dtauaer_fssa_f(nw) ) / ( dtauaer_s+dtauaer_f )
	269	ASF_T(k,nw) = ( dtauaer_sssa_s(nw)asf_s(nw) + dtauaer_fssa_f(nw)asf_f(nw) ) &
	270	/ ( ssa_s(nw)dtauaer_s + ssa_f(nw)dtauaer_f )
	271	ELSE
	272	DHAZE_T(k,nw) = 0.D0
	273	SSA_T(k,nw) = 1.0
	274	ASF_T(k,nw) = 1.0
	275	ENDIF
[3318]	276
[3083]	277	! Diagnostics for the haze :
[3318]	278	DIAG_OPTH(k,nw,1) = DHAZE_T(k,nw) ! dtau
	279	DIAG_OPTH(k,nw,2) = SSA_T(k,nw) ! wbar
	280	DIAG_OPTH(k,nw,3) = ASF_T(k,nw) ! gbar
[305]	281
[3083]	282	!---------------------
	283	! CLOUDS (Spherical) :
	284	!---------------------
	285	IF (callclouds) THEN
	286	CTYPE = 0
	287	m0ccn = pqmo(ilay,5) / 2.0
	288	m3ccn = pqmo(ilay,6) / 2.0
[3318]	289	m3cld = pqmo(ilay,6) / 2.0
[3083]	290
	291	! Clear / Dark column method :
	292	!-----------------------------
[305]	293
[3083]	294	! CCN's SSA :
	295	call get_haze_and_cloud_opacity(FTYPE,FTYPE,m0ccn,m3ccn,iw,dtau_ccn,ssa_ccn(nw),asf_ccn(nw))
[253]	296
[3083]	297	! Clear column (CCN, C2H2, C2H6, HCN) :
	298	IF (CDCOLUMN == 0) THEN
	299	DO iq = 2, nice
	300	m3cld = m3cld + (pqmo(ilay,ices_indx(iq)) / 2.0)
	301	ENDDO
	302	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0ccn,m3cld,iw,dtau_cld,ssa_cld(nw),asf_cld(nw))
	303
	304	! Dark column (CCN, CH4, C2H2, C2H6, HCN) :
	305	ELSEIF (CDCOLUMN == 1) THEN
	306	DO iq = 1, nice
	307	m3cld = m3cld + (pqmo(ilay,ices_indx(iq)) / 2.0)
	308	ENDDO
	309	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0ccn,m3cld,iw,dtau_cld,ssa_cld(nw),asf_cld(nw))
	310
	311	ELSE
	312	WRITE(,) 'WARNING OPTCV.F90 : CDCOLUMN MUST BE 0 OR 1'
	313	WRITE(,) 'WE USE DARK COLUMN ...'
	314	DO iq = 1, nice
	315	m3cld = m3cld + (pqmo(ilay,ices_indx(iq)) / 2.0)
	316	ENDDO
	317	call get_haze_and_cloud_opacity(FTYPE,CTYPE,m0ccn,m3cld,iw,dtau_cld,ssa_cld(nw),asf_cld(nw))
	318	ENDIF
[253]	319
[3083]	320	! For small dropplets, opacity of nucleus dominates
[3318]	321	dtau_cld = (dtau_cldm3ccn + dtau_cldm3cld) / (m3ccn + m3cld)
[3083]	322	ssa_cld(nw) = (ssa_ccn(nw)m3ccn + ssa_cld(nw)m3cld) / (m3ccn + m3cld)
[253]	323
[3318]	324	! Tuning of optical properties for clouds :
	325	dtau_cld = dtau_cld * (FCVIS * (1-ssa_cld(nw)) + ssa_cld(nw))
	326	ssa_cld(nw) = ssa_cld(nw) / (FCVIS * (1-ssa_cld(nw)) + ssa_cld(nw))
	327
[3083]	328	! Total of Haze + Clouds opacity (dtau), SSA (w) and ASF (COS) :
	329	DHAZE_T(k,nw) = dtauaer_s + dtauaer_f + dtau_cld
	330	IF (DHAZE_T(k,nw) .GT. 1.D-30) THEN
	331	SSA_T(k,nw) = ( dtauaer_sssa_s(nw) + dtauaer_fssa_f(nw) + dtau_cld*ssa_cld(nw) ) / ( dtauaer_s+dtauaer_f+dtau_cld )
	332	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) ) &
	333	/ ( ssa_s(nw)dtauaer_s + ssa_f(nw)dtauaer_f + ssa_cld(nw)*dtau_cld )
	334	ELSE
	335	DHAZE_T(k,nw) = 0.D0
	336	SSA_T(k,nw) = 1.0
	337	ASF_T(k,nw) = 1.0
	338	ENDIF
	339
	340	! Diagnostics for clouds :
[3318]	341	DIAG_OPTT(k,nw,1) = DHAZE_T(k,nw) ! dtau
	342	DIAG_OPTT(k,nw,2) = SSA_T(k,nw) ! wbar
	343	DIAG_OPTT(k,nw,3) = ASF_T(k,nw) ! gbar
[3083]	344
	345	ELSE
	346	! Diagnostics for clouds :
[3318]	347	DIAG_OPTT(k,nw,1) = 0.D0 ! dtau
	348	DIAG_OPTT(k,nw,2) = 1.0 ! wbar
	349	DIAG_OPTT(k,nw,3) = 1.0 ! gbar
[3083]	350	ENDIF
	351
	352	! Optics and microphysics no coupled :
	353	ELSE
	354	! Call fixed vertical haze profile of extinction - same for all columns
	355	call disr_haze(dz(k),plev(k),wnov(nw),DHAZE_T(k,nw),SSA_T(k,nw),ASF_T(k,nw))
	356	if (seashaze) DHAZE_T(k,nw) = DHAZE_T(k,nw)*seashazefact(k)
	357	! Diagnostics for the haze :
[3318]	358	DIAG_OPTH(k,nw,1) = DHAZE_T(k,nw) ! dtau
	359	DIAG_OPTH(k,nw,2) = SSA_T(k,nw) ! wbar
	360	DIAG_OPTH(k,nw,3) = ASF_T(k,nw) ! gbar
[3083]	361	! Diagnostics for clouds :
[3318]	362	DIAG_OPTT(k,nw,1) = 0.D0 ! dtau
	363	DIAG_OPTT(k,nw,2) = 1.0 ! wbar
	364	DIAG_OPTT(k,nw,3) = 1.0 ! gbar
[3083]	365	ENDIF ! ENDIF callmufi
	366
	367	!JL18 It seems to be good to have aerosols in the first "radiative layer" of the gcm in the IR
	368	! but visible does not handle very well diffusion in first layer.
	369	! The tauaero and tauray are thus set to 0 (a small value for rayleigh because the code crashes otherwise)
	370	! in the 4 first semilayers in optcv, but not optci.
	371	! This solves random variations of the sw heating at the model top.
	372	if (k<5) DHAZE_T(K,:) = 0.0
	373
	374	DRAYAER = TRAY(K,NW)
	375	! DRAYAER is Tau RAYleigh scattering, plus AERosol opacity
	376	DRAYAER = DRAYAER + DHAZE_T(K,NW) ! Titan's aerosol
[253]	377
[3083]	378	DCONT = 0.0 ! continuum absorption
[1648]	379
[3083]	380	if(continuum.and.(.not.graybody).and.callgasvis)then
	381	! include continua if necessary
	382	wn_cont = dble(wnov(nw))
	383	T_cont = dble(TMID(k))
	384	do igas=1,ngasmx
[1648]	385
[3083]	386	p_cont = dble(PMID(k)scalepgfrac(igas,ilay))
[1648]	387
[3083]	388	dtemp=0.0
	389	if(igas.eq.igas_N2)then
[253]	390
[3083]	391	interm = indv(nw,igas,igas)
	392	! call interpolateN2N2(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
	393	indv(nw,igas,igas) = interm
	394	! only goes to 500 cm^-1, so unless we're around a cold brown dwarf, this is irrelevant in the visible
[253]	395
[3083]	396	elseif(igas.eq.igas_H2)then
[253]	397
[3083]	398	! first do self-induced absorption
	399	interm = indv(nw,igas,igas)
	400	call interpolateH2H2(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
	401	indv(nw,igas,igas) = interm
[873]	402
[3083]	403	! then cross-interactions with other gases
	404	do jgas=1,ngasmx
	405	p_cross = dble(PMID(k)scalepgfrac(jgas,ilay))
	406	dtempc = 0.0
	407	if(jgas.eq.igas_N2)then
	408	interm = indv(nw,igas,jgas)
	409	call interpolateN2H2(wn_cont,T_cont,p_cross,p_cont,dtempc,.false.,interm)
	410	indv(nw,igas,jgas) = interm
	411	! should be irrelevant in the visible
	412	endif
	413	dtemp = dtemp + dtempc
	414	enddo
[253]	415
[3083]	416	elseif(igas.eq.igas_CH4)then
[305]	417
[3083]	418	! first do self-induced absorption
	419	interm = indv(nw,igas,igas)
	420	call interpolateCH4CH4(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
	421	indv(nw,igas,igas) = interm
[253]	422
[3083]	423	! then cross-interactions with other gases
	424	do jgas=1,ngasmx
	425	p_cross = dble(PMID(k)scalepgfrac(jgas,ilay))
	426	dtempc = 0.0
	427	if(jgas.eq.igas_N2)then
	428	interm = indv(nw,igas,jgas)
	429	call interpolateN2CH4(wn_cont,T_cont,p_cross,p_cont,dtempc,.false.,interm)
	430	indv(nw,igas,jgas) = interm
	431	endif
	432	dtemp = dtemp + dtempc
	433	enddo
[873]	434
[3083]	435	endif
[1725]	436
[3083]	437	DCONT = DCONT + dtemp
[253]	438
[3083]	439	enddo
[253]	440
[3083]	441	DCONT = DCONT*dz(k)
[1722]	442
[3083]	443	endif
[253]	444
[3083]	445	do ng=1,L_NGAUSS-1
[253]	446
[3083]	447	! Now compute TAUGAS
[253]	448
[3083]	449	! JVO 2017 : added tmpk because the repeated calls to gasi/v increased dramatically
	450	! the execution time of optci/v -> ~ factor 2 on the whole radiative
	451	! transfer on the tested simulations !
[253]	452
[3083]	453	if (corrk_recombin) then
	454	tmpk = GASV_RECOMB(MT(K):MT(K)+1,MP(K):MP(K)+1,NW,NG)
	455	else
	456	tmpk = GASV(MT(K):MT(K)+1,MP(K):MP(K)+1,1,NW,NG)
	457	endif
	458
	459	KCOEF(1) = tmpk(1,1) ! KCOEF(1) = GASV(MT(K),MP(K),1,NW,NG)
	460	KCOEF(2) = tmpk(1,2) ! KCOEF(2) = GASV(MT(K),MP(K)+1,1,NW,NG)
	461	KCOEF(3) = tmpk(2,2) ! KCOEF(3) = GASV(MT(K)+1,MP(K)+1,1,NW,NG)
	462	KCOEF(4) = tmpk(2,1) ! KCOEF(4) = GASV(MT(K)+1,MP(K),1,NW,NG)
[253]	463
[3083]	464	! Interpolate the gaseous k-coefficients to the requested T,P values
[253]	465
[3083]	466	ANS = LKCOEF(K,1)KCOEF(1) + LKCOEF(K,2)KCOEF(2) + &
	467	LKCOEF(K,3)KCOEF(3) + LKCOEF(K,4)KCOEF(4)
[253]	468
[3083]	469
	470	TAUGAS = U(k)*ANS
	471
	472	TAUGSURF(NW,NG) = TAUGSURF(NW,NG) + TAUGAS + DCONT
	473	DTAUKV(K,nw,ng) = TAUGAS &
	474	+ DRAYAER & ! DRAYAER includes all scattering contributions
	475	+ DCONT ! For parameterized continuum aborption
	476	end do
	477
	478	! Now fill in the "clear" part of the spectrum (NG = L_NGAUSS),
	479	! which holds continuum opacity only
	480
	481	NG = L_NGAUSS
	482	DTAUKV(K,nw,ng) = DRAYAER + DCONT ! Scattering + parameterized continuum absorption, including Titan's haze
	483
[3318]	484	DIAG_OPTH(K,nw,4) = DRAYAER
	485	DIAG_OPTH(K,nw,5) = TAUGAS
	486	DIAG_OPTH(K,nw,6) = DCONT
	487	DIAG_OPTT(K,nw,4) = DRAYAER
	488	DIAG_OPTT(K,nw,5) = TAUGAS
	489	DIAG_OPTT(K,nw,6) = DCONT
[3083]	490
[3318]	491	end do ! K = L_LEVELS
	492	end do ! nw = L_NSPECTV
	493
[716]	494	!=======================================================================
	495	! Now the full treatment for the layers, where besides the opacity
	496	! we need to calculate the scattering albedo and asymmetry factors
[2050]	497	! ======================================================================
[1722]	498
[1648]	499	! Haze scattering
[2095]	500	!JL18 It seems to be good to have aerosols in the first "radiative layer" of the gcm in the IR
[2242]	501	! but not in the visible
	502	! The dhaze_s is thus set to 0 in the 4 first semilayers in optcv, but not optci.
	503	! This solves random variations of the sw heating at the model top.
[1648]	504	DO NW=1,L_NSPECTV
[2242]	505	DHAZES_T(1:4,NW) = 0.d0
[2095]	506	DO K=5,L_LEVELS
[1722]	507	DHAZES_T(K,NW) = DHAZE_T(K,NW) * SSA_T(K,NW) ! effect of scattering albedo on haze
[1648]	508	ENDDO
	509	ENDDO
[253]	510
[3083]	511	! NW spectral loop
[716]	512	DO NW=1,L_NSPECTV
[3083]	513	! L vertical loop
	514	DO L=1,L_NLAYRAD-1
	515	K = 2*L+1
	516	atemp(L,NW) = ASF_T(K,NW)DHAZES_T(K,NW) + ASF_T(K+1,NW)DHAZES_T(K+1,NW)
	517	btemp(L,NW) = DHAZES_T(K,NW) + DHAZES_T(K+1,NW)
	518	ctemp(L,NW) = btemp(L,NW) + 0.9999*(TRAY(K,NW) + TRAY(K+1,NW)) ! JVO 2017 : does this 0.999 is really meaningful ?
	519	btemp(L,NW) = btemp(L,NW) + TRAY(K,NW) + TRAY(K+1,NW)
	520	COSBV(L,NW,1:L_NGAUSS) = atemp(L,NW)/btemp(L,NW)
	521	END DO
[919]	522
[3083]	523	! Last level
	524	L = L_NLAYRAD
	525	K = 2*L+1
	526	atemp(L,NW) = ASF_T(K,NW)*DHAZES_T(K,NW)
	527	btemp(L,NW) = DHAZES_T(K,NW)
	528	ctemp(L,NW) = btemp(L,NW) + 0.9999*TRAY(K,NW) ! JVO 2017 : does this 0.999 is really meaningful ?
	529	btemp(L,NW) = btemp(L,NW) + TRAY(K,NW)
	530	COSBV(L,NW,1:L_NGAUSS) = atemp(L,NW)/btemp(L,NW)
	531	END DO
[918]	532
[3083]	533	! NG Gauss loop
[918]	534	DO NG=1,L_NGAUSS
[3083]	535	! NW spectral loop
	536	DO NW=1,L_NSPECTV
	537	! L vertical loop
	538	DO L=1,L_NLAYRAD-1
	539	K = 2*L+1
	540	DTAUV(L,nw,ng) = DTAUKV(K,NW,NG) + DTAUKV(K+1,NW,NG)
	541	WBARV(L,nw,ng) = ctemp(L,NW) / DTAUV(L,nw,ng)
	542	END DO
[253]	543
[3083]	544	! Last level
	545	L = L_NLAYRAD
	546	K = 2*L+1
	547	DTAUV(L,nw,ng) = DTAUKV(K,NW,NG)
	548	WBARV(L,NW,NG) = ctemp(L,NW) / DTAUV(L,NW,NG)
	549	END DO
	550	END DO
[253]	551
[716]	552	! Total extinction optical depths
[3083]	553	!DO NG=1,L_NGAUSS ! full gauss loop
	554	! DO NW=1,L_NSPECTV
	555	! TAUCUMV(1,NW,NG)=0.0D0
	556	! DO K=2,L_LEVELS
	557	! TAUCUMV(K,NW,NG)=TAUCUMV(K-1,NW,NG)+DTAUKV(K,NW,NG)
	558	! END DO
	559	! DO L=1,L_NLAYRAD
	560	! TAUV(L,NW,NG)=TAUCUMV(2*L,NW,NG)
	561	! END DO
	562	! TAUV(L,NW,NG)=TAUCUMV(2*L_NLAYRAD+1,NW,NG)
	563	! END DO
	564	!END DO ! end full gauss loop
	565
	566	TAUCUMV(:,:,:) = DTAUKV(:,:,:)
	567	DO L=1,L_NLAYRAD
	568	TAUV(L,:,:)=TAUCUMV(2*L,:,:)
	569	END DO
	570	TAUV(L,:,:)=TAUCUMV(2*L_NLAYRAD+1,:,:)
[716]	571
[1897]	572	if(firstcall) firstcall = .false.
[1648]	573
[873]	574	return
	575
	576
	577	end subroutine optcv

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