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cosp_optics.f90 @ 5444

Last change on this file since 5444 was 5268, checked in by abarral, 2 months ago
.f90 <-> .F90 depending on cpp key use
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1	! %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2	! Copyright (c) 2015, Regents of the University of Colorado
3	! All rights reserved.
4	!
5	! Redistribution and use in source and binary forms, with or without modification, are
6	! permitted provided that the following conditions are met:
7	!
8	! 1. Redistributions of source code must retain the above copyright notice, this list of
9	! conditions and the following disclaimer.
10	!
11	! 2. Redistributions in binary form must reproduce the above copyright notice, this list
12	! of conditions and the following disclaimer in the documentation and/or other
13	! materials provided with the distribution.
14	!
15	! 3. Neither the name of the copyright holder nor the names of its contributors may be
16	! used to endorse or promote products derived from this software without specific prior
17	! written permission.
18	!
19	! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
20	! EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21	! MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
22	! THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23	! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
24	! OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25	! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26	! LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27	! OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	!
29	! History:
30	! 05/01/15 Dustin Swales - Original version
31	! 04/04/18 Rodrigo Guzman- Added CALIOP-like Ground LIDar routines (GLID)
32	! 10/04/18 Rodrigo Guzman- Added ATLID-like (EarthCare) lidar routines (ATLID)
33	!
34	! %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
35	module cosp_optics
36	USE COSP_KINDS, ONLY: wp,dp
37	USE COSP_MATH_CONSTANTS, ONLY: pi
38	USE COSP_PHYS_CONSTANTS, ONLY: rholiq,km,rd,grav
39	USE MOD_MODIS_SIM, ONLY: get_g_nir,get_ssa_nir,phaseIsLiquid,phaseIsIce
40	implicit none
41
42	real(wp),parameter :: & !
43	ice_density = 0.93_wp ! Ice density used in MODIS phase partitioning
44
45	interface cosp_simulator_optics
46	module procedure cosp_simulator_optics2D, cosp_simulator_optics3D
47	end interface cosp_simulator_optics
48
49	contains
50	! ##########################################################################
51	! COSP_SIMULATOR_OPTICS
52	!
53	! Used by: ISCCP, MISR and MODIS simulators
54	! ##########################################################################
55	subroutine cosp_simulator_optics2D(dim1,dim2,dim3,flag,varIN1,varIN2,varOUT)
56	! INPUTS
57	integer,intent(in) :: &
58	dim1, & ! Dimension 1 extent (Horizontal)
59	dim2, & ! Dimension 2 extent (Subcolumn)
60	dim3 ! Dimension 3 extent (Vertical)
61	real(wp),intent(in),dimension(dim1,dim2,dim3) :: &
62	flag ! Logical to determine the of merge var1IN and var2IN
63	real(wp),intent(in),dimension(dim1, dim3) :: &
64	varIN1, & ! Input field 1
65	varIN2 ! Input field 2
66	! OUTPUTS
67	real(wp),intent(out),dimension(dim1,dim2,dim3) :: &
68	varOUT ! Merged output field
69	! LOCAL VARIABLES
70	integer :: j
71
72	varOUT(1:dim1,1:dim2,1:dim3) = 0._wp
73	do j=1,dim2
74	where(flag(:,j,:) .eq. 1)
75	varOUT(:,j,:) = varIN2
76	endwhere
77	where(flag(:,j,:) .eq. 2)
78	varOUT(:,j,:) = varIN1
79	endwhere
80	enddo
81	end subroutine cosp_simulator_optics2D
82	subroutine cosp_simulator_optics3D(dim1,dim2,dim3,flag,varIN1,varIN2,varOUT)
83	! INPUTS
84	integer,intent(in) :: &
85	dim1, & ! Dimension 1 extent (Horizontal)
86	dim2, & ! Dimension 2 extent (Subcolumn)
87	dim3 ! Dimension 3 extent (Vertical)
88	real(wp),intent(in),dimension(dim1,dim2,dim3) :: &
89	flag ! Logical to determine the of merge var1IN and var2IN
90	real(wp),intent(in),dimension(dim1,dim2,dim3) :: &
91	varIN1, & ! Input field 1
92	varIN2 ! Input field 2
93	! OUTPUTS
94	real(wp),intent(out),dimension(dim1,dim2,dim3) :: &
95	varOUT ! Merged output field
96
97	varOUT(1:dim1,1:dim2,1:dim3) = 0._wp
98	where(flag(:,:,:) .eq. 1)
99	varOUT(:,:,:) = varIN2
100	endwhere
101	where(flag(:,:,:) .eq. 2)
102	varOUT(:,:,:) = varIN1
103	endwhere
104
105	end subroutine cosp_simulator_optics3D
106
107	! ##############################################################################
108	! MODIS_OPTICS_PARTITION
109	!
110	! For the MODIS simulator, there are times when only a sinlge optical depth
111	! profile, cloud-ice and cloud-water are provided. In this case, the optical
112	! depth is partitioned by phase.
113	! ##############################################################################
114	subroutine MODIS_OPTICS_PARTITION(npoints,nlev,ncolumns,cloudWater,cloudIce,waterSize, &
115	iceSize,tau,tauL,tauI)
116	! INPUTS
117	INTEGER,intent(in) :: &
118	npoints, & ! Number of horizontal gridpoints
119	nlev, & ! Number of levels
120	ncolumns ! Number of subcolumns
121	REAL(wp),intent(in),dimension(npoints,nlev,ncolumns) :: &
122	cloudWater, & ! Subcolumn cloud water content
123	cloudIce, & ! Subcolumn cloud ice content
124	waterSize, & ! Subcolumn cloud water effective radius
125	iceSize, & ! Subcolumn cloud ice effective radius
126	tau ! Optical thickness
127
128	! OUTPUTS
129	real(wp),intent(out),dimension(npoints,nlev,ncolumns) :: &
130	tauL, & ! Partitioned liquid optical thickness.
131	tauI ! Partitioned ice optical thickness.
132	! LOCAL VARIABLES
133	real(wp),dimension(nlev,ncolumns) :: fracL
134	integer :: i
135
136
137	do i=1,npoints
138	where(cloudIce(i,:, :) <= 0.)
139	fracL(:, :) = 1._wp
140	elsewhere
141	where (cloudWater(i,:, :) <= 0.)
142	fracL(:, :) = 0._wp
143	elsewhere
144	! Geometic optics limit - tau as LWP/re (proportional to LWC/re)
145	fracL(:, :) = (cloudWater(i,:, :)/waterSize(i,:, :)) / &
146	(cloudWater(i,:, :)/waterSize(i,:, :) + cloudIce(i,:, :)/(ice_density * iceSize(i,:, :)) )
147	end where
148	end where
149	tauL(i,:, :) = fracL(:, :) * tau(i,:, :)
150	tauI(i,:, :) = tau(i,:, :) - tauL(i,:, :)
151	enddo
152
153	end subroutine MODIS_OPTICS_PARTITION
154	! ########################################################################################
155	! MODIS_OPTICS
156	!
157	! ########################################################################################
158	subroutine modis_optics(nPoints,nLevels,nSubCols,tauLIQ,sizeLIQ,tauICE,sizeICE,fracLIQ, g, w0)
159	! INPUTS
160	integer, intent(in) :: nPoints,nLevels,nSubCols
161	real(wp),intent(in),dimension(nPoints,nSubCols,nLevels) :: tauLIQ, sizeLIQ, tauICE, sizeICE
162	! OUTPUTS
163	real(wp),intent(out),dimension(nPoints,nSubCols,nLevels) :: g,w0,fracLIQ
164	! LOCAL VARIABLES
165	real(wp), dimension(nLevels) :: water_g, water_w0, ice_g, ice_w0,tau
166	integer :: i,j
167
168	! Initialize
169	g(1:nPoints,1:nSubCols,1:nLevels) = 0._wp
170	w0(1:nPoints,1:nSubCols,1:nLevels) = 0._wp
171
172	do j =1,nPoints
173	do i=1,nSubCols
174	water_g(1:nLevels) = get_g_nir( phaseIsLiquid, sizeLIQ(j,i,1:nLevels))
175	water_w0(1:nLevels) = get_ssa_nir(phaseIsLiquid, sizeLIQ(j,i,1:nLevels))
176	ice_g(1:nLevels) = get_g_nir( phaseIsIce, sizeICE(j,i,1:nLevels))
177	ice_w0(1:nLevels) = get_ssa_nir(phaseIsIce, sizeICE(j,i,1:nLevels))
178
179	! Combine ice and water optical properties
180	tau(1:nLevels) = tauICE(j,i,1:nLevels) + tauLIQ(j,i,1:nLevels)
181	where (tau(1:nLevels) > 0)
182	w0(j,i,1:nLevels) = (tauLIQ(j,i,1:nLevels)water_w0(1:nLevels) + tauICE(j,i,1:nLevels) ice_w0(1:nLevels)) / &
183	(tau(1:nLevels))
184	g(j,i,1:nLevels) = (tauLIQ(j,i,1:nLevels)water_g(1:nLevels)water_w0(1:nLevels) + tauICE(j,i,1:nLevels) * &
185	ice_g(1:nLevels) * ice_w0(1:nLevels)) / (w0(j,i,1:nLevels) * tau(1:nLevels))
186	end where
187	enddo
188	enddo
189
190	! Compute the total optical thickness and the proportion due to liquid in each cell
191	do i=1,npoints
192	where(tauLIQ(i,1:nSubCols,1:nLevels) + tauICE(i,1:nSubCols,1:nLevels) > 0.)
193	fracLIQ(i,1:nSubCols,1:nLevels) = tauLIQ(i,1:nSubCols,1:nLevels)/ &
194	(tauLIQ(i,1:nSubCols,1:nLevels) + tauICE(i,1:nSubCols,1:nLevels))
195	elsewhere
196	fracLIQ(i,1:nSubCols,1:nLevels) = 0._wp
197	end where
198	enddo
199
200	end subroutine modis_optics
201
202	! ######################################################################################
203	! SUBROUTINE lidar_optics
204	! ######################################################################################
205	subroutine lidar_optics(npoints, ncolumns, nlev, npart, ice_type, lidar_freq, lground, &
206	q_lsliq, q_lsice, q_cvliq, q_cvice, ls_radliq, ls_radice, cv_radliq, cv_radice, &
207	pres, presf, temp, beta_mol, betatot, tau_mol, tautot, tautot_S_liq, tautot_S_ice,&
208	betatot_ice, betatot_liq, tautot_ice, tautot_liq)
209
210	! ####################################################################################
211	! NOTE: Using "grav" from cosp_constants.f90, instead of grav=9.81, introduces
212	! changes of up to 2% in atb532 adn 0.003% in parasolRefl and lidarBetaMol532.
213	! This also results in small changes in the joint-histogram, cfadLidarsr532.
214	! ####################################################################################
215
216	! INPUTS
217	INTEGER,intent(in) :: &
218	npoints, & ! Number of gridpoints
219	ncolumns, & ! Number of subcolumns
220	nlev, & ! Number of levels
221	npart, & ! Number of cloud meteors (stratiform_liq, stratiform_ice, conv_liq, conv_ice).
222	ice_type, & ! Ice particle shape hypothesis (0 for spheres, 1 for non-spherical)
223	lidar_freq ! Lidar frequency (nm). Use to change between lidar platforms
224	logical,intent(in) :: &
225	lground ! True for ground-based lidar
226	REAL(WP),intent(in),dimension(npoints,nlev) :: &
227	temp, & ! Temperature of layer k
228	pres, & ! Pressure at full levels
229	ls_radliq, & ! Effective radius of LS liquid particles (meters)
230	ls_radice, & ! Effective radius of LS ice particles (meters)
231	cv_radliq, & ! Effective radius of CONV liquid particles (meters)
232	cv_radice ! Effective radius of CONV ice particles (meters)
233	REAL(WP),intent(in),dimension(npoints,ncolumns,nlev) :: &
234	q_lsliq, & ! LS sub-column liquid water mixing ratio (kg/kg)
235	q_lsice, & ! LS sub-column ice water mixing ratio (kg/kg)
236	q_cvliq, & ! CONV sub-column liquid water mixing ratio (kg/kg)
237	q_cvice ! CONV sub-column ice water mixing ratio (kg/kg)
238	REAL(WP),intent(in),dimension(npoints,nlev+1) :: &
239	presf ! Pressure at half levels
240
241	! OUTPUTS
242	REAL(WP),intent(out),dimension(npoints,ncolumns,nlev) :: &
243	betatot, & !
244	tautot ! Optical thickess integrated from top
245	REAL(WP),intent(out),dimension(npoints,nlev) :: &
246	beta_mol, & ! Molecular backscatter coefficient
247	tau_mol ! Molecular optical depth
248	! OUTPUTS (optional)
249	REAL(WP),optional,intent(out),dimension(npoints,ncolumns) :: &
250	tautot_S_liq, & ! TOA optical depth for liquid
251	tautot_S_ice ! TOA optical depth for ice
252	REAL(WP),optional,intent(out),dimension(npoints,ncolumns,nlev) :: &
253	betatot_ice, & ! Backscatter coefficient for ice particles
254	betatot_liq, & ! Backscatter coefficient for liquid particles
255	tautot_ice, & ! Total optical thickness of ice
256	tautot_liq ! Total optical thickness of liq
257
258	! LOCAL VARIABLES
259	REAL(WP),dimension(npart) :: rhopart
260	REAL(WP),dimension(npart,5) :: polpart
261	REAL(WP),dimension(npoints,nlev) :: rhoair,alpha_mol
262	REAL(WP),dimension(npoints,nlev+1) :: zheight
263	REAL(WP),dimension(npoints,nlev,npart) :: rad_part,kp_part,qpart,alpha_part,tau_part
264	real(wp) :: Cmol,rdiffm
265	logical :: lparasol,lphaseoptics
266	INTEGER :: i,k,icol,zi,zf,zinc,zoffset
267
268	! Local data
269	REAL(WP),PARAMETER :: rhoice = 0.5e+03 ! Density of ice (kg/m3)
270	REAL(WP),PARAMETER :: Cmol_532nm = 6.2446e-32 ! Wavelength dependent
271	REAL(WP),PARAMETER :: Cmol_355nm = 3.2662e-31! Wavelength dependent
272	REAL(WP),PARAMETER :: rdiffm_532nm = 0.7_wp ! Multiple scattering correction parameter
273	REAL(WP),PARAMETER :: rdiffm_355nm = 0.6_wp ! Multiple scattering correction parameter
274	REAL(WP),PARAMETER :: Qscat = 2.0_wp ! Particle scattering efficiency at 532 nm
275	! Local indicies for large-scale and convective ice and liquid
276	INTEGER,PARAMETER :: INDX_LSLIQ = 1
277	INTEGER,PARAMETER :: INDX_LSICE = 2
278	INTEGER,PARAMETER :: INDX_CVLIQ = 3
279	INTEGER,PARAMETER :: INDX_CVICE = 4
280
281	! Polarized optics parameterization
282	! Polynomial coefficients for spherical liq/ice particles derived from Mie theory.
283	! Polynomial coefficients for non spherical particles derived from a composite of
284	! Ray-tracing theory for large particles (e.g. Noel et al., Appl. Opt., 2001)
285	! and FDTD theory for very small particles (Yang et al., JQSRT, 2003).
286	! We repeat the same coefficients for LS and CONV cloud to make code more readable
287	REAL(WP),PARAMETER,dimension(5) :: &
288	polpartCVLIQ = (/ 2.6980e-8_wp, -3.7701e-6_wp, 1.6594e-4_wp, -0.0024_wp, 0.0626_wp/), &
289	polpartLSLIQ = (/ 2.6980e-8_wp, -3.7701e-6_wp, 1.6594e-4_wp, -0.0024_wp, 0.0626_wp/), &
290	polpartCVICE0 = (/-1.0176e-8_wp, 1.7615e-6_wp, -1.0480e-4_wp, 0.0019_wp, 0.0460_wp/), &
291	polpartLSICE0 = (/-1.0176e-8_wp, 1.7615e-6_wp, -1.0480e-4_wp, 0.0019_wp, 0.0460_wp/), &
292	polpartCVICE1 = (/ 1.3615e-8_wp, -2.04206e-6_wp, 7.51799e-5_wp, 0.00078213_wp, 0.0182131_wp/), &
293	polpartLSICE1 = (/ 1.3615e-8_wp, -2.04206e-6_wp, 7.51799e-5_wp, 0.00078213_wp, 0.0182131_wp/)
294	! ##############################################################################
295
296	! Which LIDAR frequency are we using?
297	if (lidar_freq .eq. 355) then
298	Cmol = Cmol_355nm
299	rdiffm = rdiffm_355nm
300	endif
301	if (lidar_freq .eq. 532) then
302	Cmol = Cmol_532nm
303	rdiffm = rdiffm_532nm
304	endif
305
306	! Do we need to generate optical inputs for Parasol simulator?
307	lparasol = .false.
308	if (present(tautot_S_liq) .and. present(tautot_S_ice)) lparasol = .true.
309
310	! Are optical-depths and backscatter coefficients for ice and liquid requested?
311	lphaseoptics=.false.
312	if (present(betatot_ice) .and. present(betatot_liq) .and. present(tautot_liq) .and. &
313	present(tautot_ice)) lphaseoptics=.true.
314
315	! Is this lidar spaceborne (default) or ground-based (lground=.true.)?
316	zi = 2
317	zf = nlev
318	zinc = 1
319	zoffset = -1
320	if (lground) then
321	zi = nlev-1
322	zf = 1
323	zinc = -1
324	zoffset = 1
325	endif
326
327	! Liquid/ice particles
328	rhopart(INDX_LSLIQ) = rholiq
329	rhopart(INDX_LSICE) = rhoice
330	rhopart(INDX_CVLIQ) = rholiq
331	rhopart(INDX_CVICE) = rhoice
332
333	! LS and CONV Liquid water coefficients
334	polpart(INDX_LSLIQ,1:5) = polpartLSLIQ
335	polpart(INDX_CVLIQ,1:5) = polpartCVLIQ
336
337	! LS and CONV Ice water coefficients
338	if (ice_type .eq. 0) then
339	polpart(INDX_LSICE,1:5) = polpartLSICE0
340	polpart(INDX_CVICE,1:5) = polpartCVICE0
341	endif
342	if (ice_type .eq. 1) then
343	polpart(INDX_LSICE,1:5) = polpartLSICE1
344	polpart(INDX_CVICE,1:5) = polpartCVICE1
345	endif
346
347	! Effective radius particles:
348	rad_part(1:npoints,1:nlev,INDX_LSLIQ) = ls_radliq(1:npoints,1:nlev)
349	rad_part(1:npoints,1:nlev,INDX_LSICE) = ls_radice(1:npoints,1:nlev)
350	rad_part(1:npoints,1:nlev,INDX_CVLIQ) = cv_radliq(1:npoints,1:nlev)
351	rad_part(1:npoints,1:nlev,INDX_CVICE) = cv_radice(1:npoints,1:nlev)
352	rad_part(1:npoints,1:nlev,1:npart) = MAX(rad_part(1:npoints,1:nlev,1:npart),0._wp)
353	rad_part(1:npoints,1:nlev,1:npart) = MIN(rad_part(1:npoints,1:nlev,1:npart),70.0e-6_wp)
354
355	! Density (clear-sky air)
356	rhoair(1:npoints,1:nlev) = pres(1:npoints,1:nlev)/(rd*temp(1:npoints,1:nlev))
357
358	! Altitude at half pressure levels:
359	zheight(1:npoints,nlev+1) = 0._wp
360	do k=nlev,1,-1
361	zheight(1:npoints,k) = zheight(1:npoints,k+1) &
362	-(presf(1:npoints,k)-presf(1:npoints,k+1))/(rhoair(1:npoints,k)*grav)
363	enddo
364
365	! ##############################################################################
366	! *) Molecular alpha, beta and optical thickness
367	! ##############################################################################
368
369	beta_mol(1:npoints,1:nlev) = pres(1:npoints,1:nlev)/km/temp(1:npoints,1:nlev)*Cmol
370	alpha_mol(1:npoints,1:nlev) = 8._wppi/3._wp beta_mol(1:npoints,1:nlev)
371
372	! Optical thickness of each layer (molecular)
373	tau_mol(1:npoints,1:nlev) = alpha_mol(1:npoints,1:nlev)*(zheight(1:npoints,1:nlev)-&
374	zheight(1:npoints,2:nlev+1))
375
376	! Optical thickness from TOA to layer k (molecular)
377	DO k = zi,zf,zinc
378	tau_mol(1:npoints,k) = tau_mol(1:npoints,k) + tau_mol(1:npoints,k+zoffset)
379	ENDDO
380
381	betatot (1:npoints,1:ncolumns,1:nlev) = spread(beta_mol(1:npoints,1:nlev), dim=2, NCOPIES=ncolumns)
382	tautot (1:npoints,1:ncolumns,1:nlev) = spread(tau_mol (1:npoints,1:nlev), dim=2, NCOPIES=ncolumns)
383	if (lphaseoptics) then
384	betatot_liq(1:npoints,1:ncolumns,1:nlev) = betatot(1:npoints,1:ncolumns,1:nlev)
385	betatot_ice(1:npoints,1:ncolumns,1:nlev) = betatot(1:npoints,1:ncolumns,1:nlev)
386	tautot_liq (1:npoints,1:ncolumns,1:nlev) = tautot(1:npoints,1:ncolumns,1:nlev)
387	tautot_ice (1:npoints,1:ncolumns,1:nlev) = tautot(1:npoints,1:ncolumns,1:nlev)
388	endif
389
390	! ##############################################################################
391	! *) Particles alpha, beta and optical thickness
392	! ##############################################################################
393	! Polynomials kp_lidar derived from Mie theory
394	do i = 1, npart
395	where (rad_part(1:npoints,1:nlev,i) .gt. 0.0)
396	kp_part(1:npoints,1:nlev,i) = &
397	polpart(i,1)(rad_part(1:npoints,1:nlev,i)1e6)**4 &
398	+ polpart(i,2)(rad_part(1:npoints,1:nlev,i)1e6)**3 &
399	+ polpart(i,3)(rad_part(1:npoints,1:nlev,i)1e6)**2 &
400	+ polpart(i,4)(rad_part(1:npoints,1:nlev,i)1e6) &
401	+ polpart(i,5)
402	elsewhere
403	kp_part(1:npoints,1:nlev,i) = 0._wp
404	endwhere
405	enddo
406
407	! Initialize (if necessary)
408	if (lparasol) then
409	tautot_S_liq(1:npoints,1:ncolumns) = 0._wp
410	tautot_S_ice(1:npoints,1:ncolumns) = 0._wp
411	endif
412
413	! Loop over all subcolumns
414	do icol=1,ncolumns
415	! ##############################################################################
416	! Mixing ratio particles in each subcolum
417	! ##############################################################################
418	qpart(1:npoints,1:nlev,INDX_LSLIQ) = q_lsliq(1:npoints,icol,1:nlev)
419	qpart(1:npoints,1:nlev,INDX_LSICE) = q_lsice(1:npoints,icol,1:nlev)
420	qpart(1:npoints,1:nlev,INDX_CVLIQ) = q_cvliq(1:npoints,icol,1:nlev)
421	qpart(1:npoints,1:nlev,INDX_CVICE) = q_cvice(1:npoints,icol,1:nlev)
422
423	! ##############################################################################
424	! Alpha and optical thickness (particles)
425	! ##############################################################################
426	! Alpha of particles in each subcolumn:
427	do i = 1, npart
428	where (rad_part(1:npoints,1:nlev,i) .gt. 0.0)
429	alpha_part(1:npoints,1:nlev,i) = 3._wp/4._wp * Qscat &
430	* rhoair(1:npoints,1:nlev) * qpart(1:npoints,1:nlev,i) &
431	/ (rhopart(i) * rad_part(1:npoints,1:nlev,i) )
432	elsewhere
433	alpha_part(1:npoints,1:nlev,i) = 0._wp
434	endwhere
435	enddo
436
437	! Optical thicknes
438	tau_part(1:npoints,1:nlev,1:npart) = rdiffm * alpha_part(1:npoints,1:nlev,1:npart)
439	do i = 1, npart
440	! Optical thickness of each layer (particles)
441	tau_part(1:npoints,1:nlev,i) = tau_part(1:npoints,1:nlev,i) &
442	& * (zheight(1:npoints,1:nlev)-zheight(1:npoints,2:nlev+1) )
443	! Optical thickness from TOA to layer k (particles)
444	do k=zi,zf,zinc
445	tau_part(1:npoints,k,i) = tau_part(1:npoints,k,i) + tau_part(1:npoints,k+zoffset,i)
446	enddo
447	enddo
448
449	! ##############################################################################
450	! Beta and optical thickness (total=molecular + particules)
451	! ##############################################################################
452
453	DO i = 1, npart
454	betatot(1:npoints,icol,1:nlev) = betatot(1:npoints,icol,1:nlev) + &
455	kp_part(1:npoints,1:nlev,i)*alpha_part(1:npoints,1:nlev,i)
456	tautot(1:npoints,icol,1:nlev) = tautot(1:npoints,icol,1:nlev) + &
457	tau_part(1:npoints,1:nlev,i)
458	ENDDO
459
460	! ##############################################################################
461	! Beta and optical thickness (liquid/ice)
462	! ##############################################################################
463	if (lphaseoptics) then
464	! Ice
465	betatot_ice(1:npoints,icol,1:nlev) = betatot_ice(1:npoints,icol,1:nlev)+ &
466	kp_part(1:npoints,1:nlev,INDX_LSICE)*alpha_part(1:npoints,1:nlev,INDX_LSICE)+ &
467	kp_part(1:npoints,1:nlev,INDX_CVICE)*alpha_part(1:npoints,1:nlev,INDX_CVICE)
468	tautot_ice(1:npoints,icol,1:nlev) = tautot_ice(1:npoints,icol,1:nlev) + &
469	tau_part(1:npoints,1:nlev,INDX_LSICE) + &
470	tau_part(1:npoints,1:nlev,INDX_CVICE)
471
472	! Liquid
473	betatot_liq(1:npoints,icol,1:nlev) = betatot_liq(1:npoints,icol,1:nlev)+ &
474	kp_part(1:npoints,1:nlev,INDX_LSLIQ)*alpha_part(1:npoints,1:nlev,INDX_LSLIQ)+ &
475	kp_part(1:npoints,1:nlev,INDX_CVLIQ)*alpha_part(1:npoints,1:nlev,INDX_CVLIQ)
476	tautot_liq(1:npoints,icol,1:nlev) = tautot_liq(1:npoints,icol,1:nlev) + &
477	tau_part(1:npoints,1:nlev,INDX_LSLIQ) + &
478	tau_part(1:npoints,1:nlev,INDX_CVLIQ)
479	endif
480
481	! ##############################################################################
482	! Optical depths used by the PARASOL simulator
483	! ##############################################################################
484	if (lparasol) then
485	tautot_S_liq(:,icol) = tau_part(:,nlev,1)+tau_part(:,nlev,3)
486	tautot_S_ice(:,icol) = tau_part(:,nlev,2)+tau_part(:,nlev,4)
487	endif
488	enddo
489
490	end subroutine lidar_optics
491
492	end module cosp_optics

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