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optcv.F90 @ 1826

Last change on this file since 1826 was 1826, checked in by jvatant, 7 years ago
Correct non-initialized variables in rcm1d causing NaN's with exigent compilers ! Also correct a small error in optcv --JVO
Property svn:executable set to ``*
File size: 11.8 KB

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1	SUBROUTINE OPTCV(PQ,PLEV,TMID,PMID, &
2	DTAUV,TAUV,TAUCUMV,WBARV,COSBV,TAURAY,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	! Clean and adaptation to Titan by J. Vatant d'Ollone (2016-17)
22	!
23	!==================================================================
24	!
25	! THIS SUBROUTINE SETS THE OPTICAL CONSTANTS IN THE VISUAL
26	! IT CALCULATES FOR EACH LAYER, FOR EACH SPECTRAL INTERVAL IN THE VISUAL
27	! LAYER: WBAR, DTAU, COSBAR
28	! LEVEL: TAU
29	!
30	! TAUV(L,NW,NG) is the cumulative optical depth at the top of radiation code
31	! layer L. NW is spectral wavelength interval, ng the Gauss point index.
32	!
33	! TLEV(L) - Temperature at the layer boundary
34	! PLEV(L) - Pressure at the layer boundary (i.e. level)
35	! GASV(NT,NPS,NW,NG) - Visible k-coefficients
36	!
37	!-------------------------------------------------------------------
38
39
40	!==========================================================
41	! Input/Output
42	!==========================================================
43	REAL*8, INTENT(IN) :: PQ ! Tracers (kg/kg_of_air).
44	REAL*8, INTENT(IN) :: PLEV(L_LEVELS)
45	REAL*8, INTENT(IN) :: TMID(L_LEVELS), PMID(L_LEVELS)
46	REAL*8, INTENT(IN) :: TAURAY(L_NSPECTV)
47
48	REAL*8, INTENT(OUT) :: DTAUV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
49	REAL*8, INTENT(OUT) :: TAUV(L_NLEVRAD,L_NSPECTV,L_NGAUSS)
50	REAL*8, INTENT(OUT) :: TAUCUMV(L_LEVELS,L_NSPECTV,L_NGAUSS)
51	REAL*8, INTENT(OUT) :: COSBV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
52	REAL*8, INTENT(OUT) :: WBARV(L_NLAYRAD,L_NSPECTV,L_NGAUSS)
53	REAL*8, INTENT(OUT) :: TAUGSURF(L_NSPECTV,L_NGAUSS-1)
54	! ==========================================================
55
56	real*8 DTAUKV(L_LEVELS,L_NSPECTV,L_NGAUSS)
57
58	! Titan customisation
59	! J. Vatant d'Ollone (2016)
60	real*8 DHAZE_T(L_LEVELS,L_NSPECTI)
61	real*8 DHAZES_T(L_LEVELS,L_NSPECTI)
62	real*8 SSA_T(L_LEVELS,L_NSPECTI)
63	real*8 ASF_T(L_LEVELS,L_NSPECTI)
64	real*8 INT_DTAU(L_NLAYRAD,L_NSPECTI)
65	real*8 K_HAZE(L_NLAYRAD,L_NSPECTI)
66
67	CHARACTER*2 str2
68	! ==========================
69
70	integer L, NW, NG, K, LK, IAER
71	integer MT(L_LEVELS), MP(L_LEVELS), NP(L_LEVELS)
72	real*8 ANS, TAUGAS
73	real*8 TRAY(L_LEVELS,L_NSPECTV)
74	real*8 DPR(L_LEVELS), U(L_LEVELS)
75	real*8 LCOEF(4), LKCOEF(L_LEVELS,4)
76
77	real*8 DCONT
78	real*8 DRAYAER
79	double precision wn_cont, p_cont, p_air, T_cont, dtemp, dtempc
80	double precision p_cross
81
82	real*8 KCOEF(4)
83
84	! temporary variable to reduce memory access time to gasv
85	real*8 tmpk(2,2)
86
87	! temporary variables for multiple aerosol calculation
88	real*8 atemp(L_NLAYRAD,L_NSPECTV)
89	real*8 btemp(L_NLAYRAD,L_NSPECTV)
90	real*8 ctemp(L_NLAYRAD,L_NSPECTV)
91
92	! variables for k in units m^-1
93	real*8 dz(L_LEVELS)
94
95	integer igas, jgas, ilay
96
97	integer interm
98
99	!! AS: to save time in computing continuum (see bilinearbig)
100	IF (.not.ALLOCATED(indv)) THEN
101	ALLOCATE(indv(L_NSPECTV,ngasmx,ngasmx))
102	indv = -9999 ! this initial value means "to be calculated"
103	ENDIF
104
105	! Some initialisation beacause there's a pb with disr_haze at the limits (nw=1)
106	! I should check this - For now we set vars to zero : better than nans - JVO 2017
107
108	dhaze_t(:,:) = 0.
109	ssa_t(:,:) = 0.
110	asf_t(:,:) = 0.
111
112
113	!=======================================================================
114	! Determine the total gas opacity throughout the column, for each
115	! spectral interval, NW, and each Gauss point, NG.
116	! Calculate the continuum opacities, i.e., those that do not depend on
117	! NG, the Gauss index.
118
119	taugsurf(:,:) = 0.0
120	dpr(:) = 0.0
121	lkcoef(:,:) = 0.0
122
123	do K=2,L_LEVELS
124	DPR(k) = PLEV(K)-PLEV(K-1)
125
126	! if we have continuum opacities, we need dz
127
128	dz(k) = dpr(k)RTMID(K)/(glat_ig*PMID(K))
129	U(k) = Cmk*DPR(k) ! only Cmk line in optcv.F
130
131	call tpindex(PMID(K),TMID(K),pfgasref,tgasref,LCOEF,MT(K),MP(K))
132
133	do LK=1,4
134	LKCOEF(K,LK) = LCOEF(LK)
135	end do
136	end do ! levels
137
138	! Rayleigh scattering
139	do NW=1,L_NSPECTV
140	do K=2,L_LEVELS
141	TRAY(K,NW) = TAURAY(NW) * DPR(K)
142	end do ! levels
143	end do
144
145	! we ignore K=1...
146	do K=2,L_LEVELS
147
148	ilay = k / 2 ! int. arithmetic => gives the gcm layer index
149
150	do NW=1,L_NSPECTV
151
152	!================= Titan customisation ========================================
153	call disr_haze(dz(k),plev(k),wnov(nw),dhaze_T(k,nw),SSA_T(k,nw),ASF_T(k,nw))
154	! =============================================================================
155
156	DRAYAER = TRAY(K,NW)
157	! DRAYAER is Tau RAYleigh scattering, plus AERosol opacity
158	DRAYAER = DRAYAER + DHAZE_T(K,NW) ! Titan's aerosol
159
160	DCONT = 0.0 ! continuum absorption
161
162	if(continuum.and.(.not.graybody).and.callgasvis)then
163	! include continua if necessary
164	wn_cont = dble(wnov(nw))
165	T_cont = dble(TMID(k))
166	do igas=1,ngasmx
167
168	p_cont = dble(PMID(k)scalepgfrac(igas,ilay))
169
170	dtemp=0.0
171	if(igas.eq.igas_N2)then
172
173	interm = indv(nw,igas,igas)
174	! call interpolateN2N2(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
175	indv(nw,igas,igas) = interm
176	! only goes to 500 cm^-1, so unless we're around a cold brown dwarf, this is irrelevant in the visible
177
178	elseif(igas.eq.igas_H2)then
179
180	! first do self-induced absorption
181	interm = indv(nw,igas,igas)
182	call interpolateH2H2(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
183	indv(nw,igas,igas) = interm
184
185	! then cross-interactions with other gases
186	do jgas=1,ngasmx
187	p_cross = dble(PMID(k)scalepgfrac(jgas,ilay))
188	dtempc = 0.0
189	if(jgas.eq.igas_N2)then
190	interm = indv(nw,igas,jgas)
191	call interpolateN2H2(wn_cont,T_cont,p_cross,p_cont,dtempc,.false.,interm)
192	indv(nw,igas,jgas) = interm
193	! should be irrelevant in the visible
194	endif
195	dtemp = dtemp + dtempc
196	enddo
197
198	elseif(igas.eq.igas_CH4)then
199
200	! first do self-induced absorption
201	interm = indv(nw,igas,igas)
202	call interpolateCH4CH4(wn_cont,T_cont,p_cont,dtemp,.false.,interm)
203	indv(nw,igas,igas) = interm
204
205	! then cross-interactions with other gases
206	do jgas=1,ngasmx
207	p_cross = dble(PMID(k)scalepgfrac(jgas,ilay))
208	dtempc = 0.0
209	if(jgas.eq.igas_N2)then
210	interm = indv(nw,igas,jgas)
211	call interpolateN2CH4(wn_cont,T_cont,p_cross,p_cont,dtempc,.false.,interm)
212	indv(nw,igas,jgas) = interm
213	endif
214	dtemp = dtemp + dtempc
215	enddo
216
217	endif
218
219	DCONT = DCONT + dtemp
220
221	enddo
222
223	DCONT = DCONT*dz(k)
224
225	endif
226
227	do ng=1,L_NGAUSS-1
228
229	! Now compute TAUGAS
230
231	! JVO 2017 : added tmpk because the repeated calls to gasi/v increased dramatically
232	! the execution time of optci/v -> ~ factor 2 on the whole radiative
233	! transfer on the tested simulations !
234
235	tmpk = GASV(MT(K):MT(K)+1,MP(K):MP(K)+1,1,NW,NG)
236
237	KCOEF(1) = tmpk(1,1) ! KCOEF(1) = GASV(MT(K),MP(K),1,NW,NG)
238	KCOEF(2) = tmpk(1,2) ! KCOEF(2) = GASV(MT(K),MP(K)+1,1,NW,NG)
239	KCOEF(3) = tmpk(2,2) ! KCOEF(3) = GASV(MT(K)+1,MP(K)+1,1,NW,NG)
240	KCOEF(4) = tmpk(2,1) ! KCOEF(4) = GASV(MT(K)+1,MP(K),1,NW,NG)
241
242	! Interpolate the gaseous k-coefficients to the requested T,P values
243
244	ANS = LKCOEF(K,1)KCOEF(1) + LKCOEF(K,2)KCOEF(2) + &
245	LKCOEF(K,3)KCOEF(3) + LKCOEF(K,4)KCOEF(4)
246
247
248	TAUGAS = U(k)*ANS
249
250	TAUGSURF(NW,NG) = TAUGSURF(NW,NG) + TAUGAS + DCONT
251	DTAUKV(K,nw,ng) = TAUGAS &
252	+ DRAYAER & ! DRAYAER includes all scattering contributions
253	+ DCONT ! For parameterized continuum aborption
254
255	end do
256
257	! Now fill in the "clear" part of the spectrum (NG = L_NGAUSS),
258	! which holds continuum opacity only
259
260	NG = L_NGAUSS
261	DTAUKV(K,nw,ng) = DRAYAER + DCONT ! Scattering + parameterized continuum absorption, including Titan's haze
262
263	end do
264	end do
265
266
267	!=======================================================================
268	! Now the full treatment for the layers, where besides the opacity
269	! we need to calculate the scattering albedo and asymmetry factors
270
271	! Haze scattering
272	DO NW=1,L_NSPECTV
273	DO K=2,L_LEVELS
274	DHAZES_T(K,NW) = DHAZE_T(K,NW) * SSA_T(K,NW) ! effect of scattering albedo on haze
275	ENDDO
276	ENDDO
277
278
279	DO NW=1,L_NSPECTV
280	DO L=1,L_NLAYRAD-1
281	K = 2*L+1
282	atemp(L,NW) = ASF_T(K,NW)DHAZES_T(K,NW) + ASF_T(K+1,NW)DHAZES_T(K+1,NW)
283	btemp(L,NW) = DHAZES_T(K,NW) + DHAZES_T(K+1,NW)
284	ctemp(L,NW) = btemp(L,NW) + 0.9999*(TRAY(K,NW) + TRAY(K+1,NW)) ! JVO 2017 : does this 0.999 is really meaningful ?
285	btemp(L,NW) = btemp(L,NW) + TRAY(K,NW) + TRAY(K+1,NW)
286	COSBV(L,NW,1:L_NGAUSS) = atemp(L,NW)/btemp(L,NW)
287	END DO ! L vertical loop
288
289	! Last level
290	L = L_NLAYRAD
291	K = 2*L+1
292	atemp(L,NW) = ASF_T(K,NW)*DHAZES_T(K,NW)
293	btemp(L,NW) = DHAZES_T(K,NW)
294	ctemp(L,NW) = btemp(L,NW) + 0.9999*TRAY(K,NW) ! JVO 2017 : does this 0.999 is really meaningful ?
295	btemp(L,NW) = btemp(L,NW) + TRAY(K,NW)
296	COSBV(L,NW,1:L_NGAUSS) = atemp(L,NW)/btemp(L,NW)
297
298
299	END DO ! NW spectral loop
300
301	DO NG=1,L_NGAUSS
302	DO NW=1,L_NSPECTV
303	DO L=1,L_NLAYRAD-1
304
305	K = 2*L+1
306	DTAUV(L,nw,ng) = DTAUKV(K,NW,NG) + DTAUKV(K+1,NW,NG)
307	WBARV(L,nw,ng) = ctemp(L,NW) / DTAUV(L,nw,ng)
308
309	END DO ! L vertical loop
310
311	! Last level
312
313	L = L_NLAYRAD
314	K = 2*L+1
315	DTAUV(L,nw,ng) = DTAUKV(K,NW,NG)
316
317	WBARV(L,NW,NG) = ctemp(L,NW) / DTAUV(L,NW,NG)
318
319	END DO ! NW spectral loop
320	END DO ! NG Gauss loop
321
322	! Total extinction optical depths
323
324	DO NG=1,L_NGAUSS ! full gauss loop
325	DO NW=1,L_NSPECTV
326	TAUV(1,NW,NG)=0.0D0
327	DO L=1,L_NLAYRAD
328	TAUV(L+1,NW,NG)=TAUV(L,NW,NG)+DTAUV(L,NW,NG)
329	END DO
330
331	TAUCUMV(1,NW,NG)=0.0D0
332	DO K=2,L_LEVELS
333	TAUCUMV(K,NW,NG)=TAUCUMV(K-1,NW,NG)+DTAUKV(K,NW,NG)
334	END DO
335	END DO
336	END DO ! end full gauss loop
337
338
339	! Titan's outputs (JVO, 2016)===============================================
340	! do l=1,L_NLAYRAD
341	! do nw=1,L_NSPECTV
342	! INT_DTAU(L,NW) = 0.0d+0
343	! DO NG=1,L_NGAUSS
344	! INT_DTAU(L,NW)= INT_DTAU(L,NW) + dtauv(L,nw,ng)*gweight(NG)
345	! enddo
346	! enddo
347	! enddo
348
349	! do nw=1,L_NSPECTV
350	! write(str2,'(i2.2)') nw
351	! 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))
352	! 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))
353	! enddo
354
355	! ==============================================================================
356
357
358	return
359
360
361	end subroutine optcv

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