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radiation_cloud_optics.F90 @ 4936

Last change on this file since 4936 was 4773, checked in by idelkadi, 11 months ago

Update of Ecrad in LMDZ The same organization of the Ecrad offline version is retained in order to facilitate the updating of Ecrad in LMDZ and the comparison between online and offline results. version 1.6.1 of Ecrad (https://github.com/lguez/ecrad.git)

Implementation of the double call of Ecrad in LMDZ

File size: 23.5 KB

Line
1	! radiation_cloud_optics.F90 - Computing cloud optical properties
2	!
3	! (C) Copyright 2014- ECMWF.
4	!
5	! This software is licensed under the terms of the Apache Licence Version 2.0
6	! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
7	!
8	! In applying this licence, ECMWF does not waive the privileges and immunities
9	! granted to it by virtue of its status as an intergovernmental organisation
10	! nor does it submit to any jurisdiction.
11	!
12	! Author: Robin Hogan
13	! Email: r.j.hogan@ecmwf.int
14	!
15	! Modifications
16	! 2017-07-22 R. Hogan Added Yi et al. ice optics model
17
18	module radiation_cloud_optics
19
20	implicit none
21
22	public
23
24	contains
25
26	! Provides elemental function "delta_eddington_scat_od"
27	#include "radiation_delta_eddington.h"
28
29	!---------------------------------------------------------------------
30	! Load cloud scattering data; this subroutine delegates to one
31	! in radiation_cloud_optics_data.F90, but checks the size of
32	! what is returned
33	subroutine setup_cloud_optics(config)
34
35	use parkind1, only : jprb
36	use yomhook, only : lhook, dr_hook, jphook
37
38	use radiation_io, only : nulerr, radiation_abort
39	use radiation_config, only : config_type, IIceModelFu, IIceModelBaran, &
40	& IIceModelBaran2016, IIceModelBaran2017, &
41	& IIceModelYi, &
42	& ILiquidModelSOCRATES, ILiquidModelSlingo
43	use radiation_ice_optics_fu, only : NIceOpticsCoeffsFuSW, &
44	& NIceOpticsCoeffsFuLW
45	use radiation_ice_optics_baran, only : NIceOpticsCoeffsBaran, &
46	& NIceOpticsCoeffsBaran2016
47	use radiation_ice_optics_baran2017, only : NIceOpticsCoeffsBaran2017, &
48	& NIceOpticsGeneralCoeffsBaran2017
49	use radiation_ice_optics_yi, only : NIceOpticsCoeffsYiSW, &
50	& NIceOpticsCoeffsYiLW
51	use radiation_liquid_optics_socrates, only : NLiqOpticsCoeffsSOCRATES
52	use radiation_liquid_optics_slingo, only : NLiqOpticsCoeffsSlingoSW, &
53	& NLiqOpticsCoeffsLindnerLiLW
54
55	type(config_type), intent(inout) :: config
56
57	real(jphook) :: hook_handle
58
59	if (lhook) call dr_hook('radiation_cloud_optics:setup_cloud_optics',0,hook_handle)
60
61	call config%cloud_optics%setup(trim(config%liq_optics_file_name), &
62	& trim(config%ice_optics_file_name), iverbose=config%iverbosesetup)
63
64	! Check liquid coefficients
65	if (size(config%cloud_optics%liq_coeff_lw, 1) /= config%n_bands_lw) then
66	write(nulerr,'(a,i0,a,i0,a)') &
67	& '*** Error: number of longwave bands for droplets (', &
68	& size(config%cloud_optics%liq_coeff_lw, 1), &
69	& ') does not match number for gases (', config%n_bands_lw, ')'
70	call radiation_abort()
71	end if
72	if (size(config%cloud_optics%liq_coeff_sw, 1) /= config%n_bands_sw) then
73	write(nulerr,'(a,i0,a,i0,a)') &
74	& '*** Error: number of shortwave bands for droplets (', &
75	& size(config%cloud_optics%liq_coeff_sw, 1), &
76	& ') does not match number for gases (', config%n_bands_sw, ')'
77	call radiation_abort()
78	end if
79
80	if (config%i_liq_model == ILiquidModelSOCRATES) then
81	if (size(config%cloud_optics%liq_coeff_lw, 2) /= NLiqOpticsCoeffsSOCRATES) then
82	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
83	& '*** Error: number of liquid cloud optical coefficients (', &
84	& size(config%cloud_optics%liq_coeff_lw, 2), &
85	& ') does not match number expected (', NLiqOpticsCoeffsSOCRATES,')'
86	call radiation_abort()
87	end if
88	else if (config%i_liq_model == ILiquidModelSlingo) then
89	if (size(config%cloud_optics%liq_coeff_sw, 2) /= NLiqOpticsCoeffsSlingoSW) then
90	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
91	& '*** Error: number of shortwave liquid cloud optical coefficients (', &
92	& size(config%cloud_optics%liq_coeff_sw, 2), &
93	& ') does not match number expected (', NLiqOpticsCoeffsSlingoSW,')'
94	call radiation_abort()
95	end if
96	if (size(config%cloud_optics%liq_coeff_lw, 2) /= NLiqOpticsCoeffsLindnerLiLW) then
97	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
98	& '*** Error: number of longwave liquid cloud optical coefficients (', &
99	& size(config%cloud_optics%liq_coeff_lw, 2), &
100	& ') does not match number expected (', NLiqOpticsCoeffsLindnerLiLw,')'
101	call radiation_abort()
102	end if
103	end if
104
105	! Check ice coefficients
106	if (size(config%cloud_optics%ice_coeff_lw, 1) /= config%n_bands_lw) then
107	write(nulerr,'(a,i0,a,i0,a)') &
108	& '*** Error: number of longwave bands for ice particles (', &
109	& size(config%cloud_optics%ice_coeff_lw, 1), &
110	& ') does not match number for gases (', config%n_bands_lw, ')'
111	call radiation_abort()
112	end if
113	if (size(config%cloud_optics%ice_coeff_sw, 1) /= config%n_bands_sw) then
114	write(nulerr,'(a,i0,a,i0,a)') &
115	& '*** Error: number of shortwave bands for ice particles (', &
116	& size(config%cloud_optics%ice_coeff_sw, 1), &
117	& ') does not match number for gases (', config%n_bands_sw, ')'
118	call radiation_abort()
119	end if
120
121	if (config%i_ice_model == IIceModelFu) then
122	if (size(config%cloud_optics%ice_coeff_lw, 2) &
123	& /= NIceOpticsCoeffsFuLW) then
124	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
125	& '*** Error: number of LW ice-particle optical coefficients (', &
126	& size(config%cloud_optics%ice_coeff_lw, 2), &
127	& ') does not match number expected (', NIceOpticsCoeffsFuLW,')'
128	call radiation_abort()
129	end if
130	if (size(config%cloud_optics%ice_coeff_sw, 2) &
131	& /= NIceOpticsCoeffsFuSW) then
132	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
133	& '*** Error: number of SW ice-particle optical coefficients (', &
134	& size(config%cloud_optics%ice_coeff_sw, 2), &
135	& ') does not match number expected (', NIceOpticsCoeffsFuSW,')'
136	call radiation_abort()
137	end if
138	else if (config%i_ice_model == IIceModelBaran &
139	& .and. size(config%cloud_optics%ice_coeff_lw, 2) &
140	& /= NIceOpticsCoeffsBaran) then
141	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
142	& '*** Error: number of ice-particle optical coefficients (', &
143	& size(config%cloud_optics%ice_coeff_lw, 2), &
144	& ') does not match number expected (', NIceOpticsCoeffsBaran,')'
145	call radiation_abort()
146	else if (config%i_ice_model == IIceModelBaran2016 &
147	& .and. size(config%cloud_optics%ice_coeff_lw, 2) &
148	& /= NIceOpticsCoeffsBaran2016) then
149	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
150	& '*** Error: number of ice-particle optical coefficients (', &
151	& size(config%cloud_optics%ice_coeff_lw, 2), &
152	& ') does not match number expected (', NIceOpticsCoeffsBaran2016,')'
153	call radiation_abort()
154	else if (config%i_ice_model == IIceModelBaran2017) then
155	if (size(config%cloud_optics%ice_coeff_lw, 2) &
156	& /= NIceOpticsCoeffsBaran2017) then
157	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
158	& '*** Error: number of ice-particle optical coefficients (', &
159	& size(config%cloud_optics%ice_coeff_lw, 2), &
160	& ') does not match number expected (', NIceOpticsCoeffsBaran2017,')'
161	call radiation_abort()
162	else if (.not. allocated(config%cloud_optics%ice_coeff_gen)) then
163	write(nulerr,'(a)') &
164	& '*** Error: coeff_gen needed for Baran-2017 ice optics parameterization'
165	call radiation_abort()
166	else if (size(config%cloud_optics%ice_coeff_gen) &
167	& /= NIceOpticsGeneralCoeffsBaran2017) then
168	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
169	& '*** Error: number of general ice-particle optical coefficients (', &
170	& size(config%cloud_optics%ice_coeff_gen), &
171	& ') does not match number expected (', NIceOpticsGeneralCoeffsBaran2017,')'
172	call radiation_abort()
173	end if
174	else if (config%i_ice_model == IIceModelYi) then
175	if (size(config%cloud_optics%ice_coeff_lw, 2) &
176	& /= NIceOpticsCoeffsYiLW) then
177	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
178	& '*** Error: number of LW ice-particle optical coefficients (', &
179	& size(config%cloud_optics%ice_coeff_lw, 2), &
180	& ') does not match number expected (', NIceOpticsCoeffsYiLW,')'
181	call radiation_abort()
182	end if
183	if (size(config%cloud_optics%ice_coeff_sw, 2) &
184	& /= NIceOpticsCoeffsYiSW) then
185	write(nulerr,'(a,i0,a,i0,a,i0,a)') &
186	& '*** Error: number of SW ice-particle optical coefficients (', &
187	& size(config%cloud_optics%ice_coeff_sw, 2), &
188	& ') does not match number expected (', NIceOpticsCoeffsYiSW,')'
189	call radiation_abort()
190	end if
191	end if
192
193	if (lhook) call dr_hook('radiation_cloud_optics:setup_cloud_optics',1,hook_handle)
194
195	end subroutine setup_cloud_optics
196
197
198	!---------------------------------------------------------------------
199	! Compute cloud optical properties
200	subroutine cloud_optics(nlev,istartcol,iendcol, &
201	& config, thermodynamics, cloud, &
202	& od_lw_cloud, ssa_lw_cloud, g_lw_cloud, &
203	& od_sw_cloud, ssa_sw_cloud, g_sw_cloud)
204
205	use parkind1, only : jprb
206	use yomhook, only : lhook, dr_hook, jphook
207
208	use radiation_io, only : nulout, nulerr, radiation_abort
209	use radiation_config, only : config_type, IIceModelFu, IIceModelBaran, &
210	& IIceModelBaran2016, IIceModelBaran2017, &
211	& IIceModelYi, &
212	& ILiquidModelSOCRATES, ILiquidModelSlingo
213	use radiation_thermodynamics, only : thermodynamics_type
214	use radiation_cloud, only : cloud_type
215	use radiation_constants, only : AccelDueToGravity
216	use radiation_ice_optics_fu, only : calc_ice_optics_fu_sw, &
217	& calc_ice_optics_fu_lw
218	use radiation_ice_optics_baran, only : calc_ice_optics_baran, &
219	& calc_ice_optics_baran2016
220	use radiation_ice_optics_baran2017, only : calc_ice_optics_baran2017
221	use radiation_ice_optics_yi, only : calc_ice_optics_yi_sw, &
222	& calc_ice_optics_yi_lw
223	use radiation_liquid_optics_socrates, only:calc_liq_optics_socrates
224	use radiation_liquid_optics_slingo, only:calc_liq_optics_slingo, &
225	& calc_liq_optics_lindner_li
226
227	integer, intent(in) :: nlev ! number of model levels
228	integer, intent(in) :: istartcol, iendcol ! range of columns to process
229	type(config_type), intent(in), target :: config
230	type(thermodynamics_type),intent(in) :: thermodynamics
231	type(cloud_type), intent(in) :: cloud
232
233	! Layer optical depth, single scattering albedo and g factor of
234	! clouds in each longwave band, where the latter two
235	! variables are only defined if cloud longwave scattering is
236	! enabled (otherwise both are treated as zero).
237	real(jprb), dimension(config%n_bands_lw,nlev,istartcol:iendcol), intent(out) :: &
238	& od_lw_cloud
239	real(jprb), dimension(config%n_bands_lw_if_scattering,nlev,istartcol:iendcol), &
240	& intent(out) :: ssa_lw_cloud, g_lw_cloud
241
242	! Layer optical depth, single scattering albedo and g factor of
243	! clouds in each shortwave band
244	real(jprb), dimension(config%n_bands_sw,nlev,istartcol:iendcol), intent(out) :: &
245	& od_sw_cloud, ssa_sw_cloud, g_sw_cloud
246
247	! Longwave and shortwave optical depth, scattering optical depth
248	! and asymmetry factor, for liquid and ice in all bands but a
249	! single cloud layer
250	real(jprb), dimension(config%n_bands_lw) :: &
251	& od_lw_liq, scat_od_lw_liq, g_lw_liq, &
252	& od_lw_ice, scat_od_lw_ice, g_lw_ice
253	real(jprb), dimension(config%n_bands_sw) :: &
254	& od_sw_liq, scat_od_sw_liq, g_sw_liq, &
255	& od_sw_ice, scat_od_sw_ice, g_sw_ice
256
257	! In-cloud water path of cloud liquid or ice (i.e. liquid or ice
258	! gridbox-mean water path divided by cloud fraction); kg m-2
259	real(jprb) :: lwp_in_cloud, iwp_in_cloud
260
261	! Full-level temperature (K)
262	real(jprb) :: temperature
263
264	! Factor to convert gridbox-mean mixing ratio to in-cloud water
265	! path
266	real(jprb) :: factor
267
268	integer :: jcol, jlev, jb
269
270	real(jphook) :: hook_handle
271
272	if (lhook) call dr_hook('radiation_cloud_optics:cloud_optics',0,hook_handle)
273
274	if (config%iverbose >= 2) then
275	write(nulout,'(a)') 'Computing cloud absorption/scattering properties'
276	end if
277
278	associate(ho => config%cloud_optics)
279
280	! Array-wise assignment
281	od_lw_cloud = 0.0_jprb
282	od_sw_cloud = 0.0_jprb
283	ssa_sw_cloud = 0.0_jprb
284	g_sw_cloud = 0.0_jprb
285	if (config%do_lw_cloud_scattering) then
286	ssa_lw_cloud = 0.0_jprb
287	g_lw_cloud = 0.0_jprb
288	end if
289
290	do jlev = 1,nlev
291	do jcol = istartcol,iendcol
292	! Only do anything if cloud is present (assume that
293	! cloud%crop_cloud_fraction has already been called)
294	if (cloud%fraction(jcol,jlev) > 0.0_jprb) then
295
296	! Compute in-cloud liquid and ice water path
297	if (config%is_homogeneous) then
298	! Homogeneous solvers assume cloud fills the box
299	! horizontally, so we don't divide by cloud fraction
300	factor = ( thermodynamics%pressure_hl(jcol,jlev+1) &
301	& -thermodynamics%pressure_hl(jcol,jlev ) ) &
302	& / AccelDueToGravity
303	else
304	factor = ( thermodynamics%pressure_hl(jcol,jlev+1) &
305	& -thermodynamics%pressure_hl(jcol,jlev ) ) &
306	& / (AccelDueToGravity * cloud%fraction(jcol,jlev))
307	end if
308	lwp_in_cloud = factor * cloud%q_liq(jcol,jlev)
309	iwp_in_cloud = factor * cloud%q_ice(jcol,jlev)
310
311	! Only compute liquid properties if liquid cloud is
312	! present
313	if (lwp_in_cloud > 0.0_jprb) then
314	if (config%i_liq_model == ILiquidModelSOCRATES) then
315	! Compute longwave properties
316	call calc_liq_optics_socrates(config%n_bands_lw, &
317	& config%cloud_optics%liq_coeff_lw, &
318	& lwp_in_cloud, cloud%re_liq(jcol,jlev), &
319	& od_lw_liq, scat_od_lw_liq, g_lw_liq)
320	! Compute shortwave properties
321	call calc_liq_optics_socrates(config%n_bands_sw, &
322	& config%cloud_optics%liq_coeff_sw, &
323	& lwp_in_cloud, cloud%re_liq(jcol,jlev), &
324	& od_sw_liq, scat_od_sw_liq, g_sw_liq)
325	else if (config%i_liq_model == ILiquidModelSlingo) then
326	! Compute longwave properties
327	call calc_liq_optics_lindner_li(config%n_bands_lw, &
328	& config%cloud_optics%liq_coeff_lw, &
329	& lwp_in_cloud, cloud%re_liq(jcol,jlev), &
330	& od_lw_liq, scat_od_lw_liq, g_lw_liq)
331	! Compute shortwave properties
332	call calc_liq_optics_slingo(config%n_bands_sw, &
333	& config%cloud_optics%liq_coeff_sw, &
334	& lwp_in_cloud, cloud%re_liq(jcol,jlev), &
335	& od_sw_liq, scat_od_sw_liq, g_sw_liq)
336	else
337	write(nulerr,) '** Error: Unknown liquid model with code', &
338	& config%i_liq_model
339	call radiation_abort()
340	end if
341
342	! Delta-Eddington scaling in the shortwave only
343	if (.not. config%do_sw_delta_scaling_with_gases) then
344	call delta_eddington_scat_od(od_sw_liq, scat_od_sw_liq, g_sw_liq)
345	end if
346	! Originally delta-Eddington has been off in ecRad for
347	! liquid clouds in the longwave, but it should be on
348	!call delta_eddington_scat_od(od_lw_liq, scat_od_lw_liq, g_lw_liq)
349
350	else
351	! Liquid not present: set properties to zero
352	od_lw_liq = 0.0_jprb
353	scat_od_lw_liq = 0.0_jprb
354	g_lw_liq = 0.0_jprb
355
356	od_sw_liq = 0.0_jprb
357	scat_od_sw_liq = 0.0_jprb
358	g_sw_liq = 0.0_jprb
359	end if ! Liquid present
360
361	! Only compute ice properties if ice cloud is present
362	if (iwp_in_cloud > 0.0_jprb) then
363	if (config%i_ice_model == IIceModelBaran) then
364	! Compute longwave properties
365	call calc_ice_optics_baran(config%n_bands_lw, &
366	& config%cloud_optics%ice_coeff_lw, &
367	& iwp_in_cloud, cloud%q_ice(jcol,jlev), &
368	& od_lw_ice, scat_od_lw_ice, g_lw_ice)
369	! Compute shortwave properties
370	call calc_ice_optics_baran(config%n_bands_sw, &
371	& config%cloud_optics%ice_coeff_sw, &
372	& iwp_in_cloud, cloud%q_ice(jcol,jlev), &
373	& od_sw_ice, scat_od_sw_ice, g_sw_ice)
374	else if (config%i_ice_model == IIceModelBaran2016) then
375	temperature = 0.5_jprb * (thermodynamics%temperature_hl(jcol,jlev) &
376	& +thermodynamics%temperature_hl(jcol,jlev+1))
377	! Compute longwave properties
378	call calc_ice_optics_baran2016(config%n_bands_lw, &
379	& config%cloud_optics%ice_coeff_lw, &
380	& iwp_in_cloud, cloud%q_ice(jcol,jlev), &
381	& temperature, &
382	& od_lw_ice, scat_od_lw_ice, g_lw_ice)
383	! Compute shortwave properties
384	call calc_ice_optics_baran2016(config%n_bands_sw, &
385	& config%cloud_optics%ice_coeff_sw, &
386	& iwp_in_cloud, cloud%q_ice(jcol,jlev), &
387	& temperature, &
388	& od_sw_ice, scat_od_sw_ice, g_sw_ice)
389	else if (config%i_ice_model == IIceModelBaran2017) then
390	temperature = 0.5_jprb * (thermodynamics%temperature_hl(jcol,jlev) &
391	& +thermodynamics%temperature_hl(jcol,jlev+1))
392	! Compute longwave properties
393	call calc_ice_optics_baran2017(config%n_bands_lw, &
394	& config%cloud_optics%ice_coeff_gen, &
395	& config%cloud_optics%ice_coeff_lw, &
396	& iwp_in_cloud, cloud%q_ice(jcol,jlev), &
397	& temperature, &
398	& od_lw_ice, scat_od_lw_ice, g_lw_ice)
399	! Compute shortwave properties
400	call calc_ice_optics_baran2017(config%n_bands_sw, &
401	& config%cloud_optics%ice_coeff_gen, &
402	& config%cloud_optics%ice_coeff_sw, &
403	& iwp_in_cloud, cloud%q_ice(jcol,jlev), &
404	& temperature, &
405	& od_sw_ice, scat_od_sw_ice, g_sw_ice)
406	else if (config%i_ice_model == IIceModelFu) then
407	! Compute longwave properties
408	call calc_ice_optics_fu_lw(config%n_bands_lw, &
409	& config%cloud_optics%ice_coeff_lw, &
410	& iwp_in_cloud, cloud%re_ice(jcol,jlev), &
411	& od_lw_ice, scat_od_lw_ice, g_lw_ice)
412	if (config%do_fu_lw_ice_optics_bug) then
413	! Reproduce bug in old IFS scheme
414	scat_od_lw_ice = od_lw_ice - scat_od_lw_ice
415	end if
416	! Compute shortwave properties
417	call calc_ice_optics_fu_sw(config%n_bands_sw, &
418	& config%cloud_optics%ice_coeff_sw, &
419	& iwp_in_cloud, cloud%re_ice(jcol,jlev), &
420	& od_sw_ice, scat_od_sw_ice, g_sw_ice)
421	else if (config%i_ice_model == IIceModelYi) then
422	! Compute longwave properties
423	call calc_ice_optics_yi_lw(config%n_bands_lw, &
424	& config%cloud_optics%ice_coeff_lw, &
425	& iwp_in_cloud, cloud%re_ice(jcol,jlev), &
426	& od_lw_ice, scat_od_lw_ice, g_lw_ice)
427	! Compute shortwave properties
428	call calc_ice_optics_yi_sw(config%n_bands_sw, &
429	& config%cloud_optics%ice_coeff_sw, &
430	& iwp_in_cloud, cloud%re_ice(jcol,jlev), &
431	& od_sw_ice, scat_od_sw_ice, g_sw_ice)
432	else
433	write(nulerr,) '** Error: Unknown ice model with code', &
434	& config%i_ice_model
435	call radiation_abort()
436	end if
437
438	! Delta-Eddington scaling in both longwave and shortwave
439	! (assume that particles are larger than wavelength even
440	! in longwave)
441	if (.not. config%do_sw_delta_scaling_with_gases) then
442	call delta_eddington_scat_od(od_sw_ice, scat_od_sw_ice, g_sw_ice)
443	end if
444	call delta_eddington_scat_od(od_lw_ice, scat_od_lw_ice, g_lw_ice)
445
446	else
447	! Ice not present: set properties to zero
448	od_lw_ice = 0.0_jprb
449	scat_od_lw_ice = 0.0_jprb
450	g_lw_ice = 0.0_jprb
451
452	od_sw_ice = 0.0_jprb
453	scat_od_sw_ice = 0.0_jprb
454	g_sw_ice = 0.0_jprb
455	end if ! Ice present
456
457	! Combine liquid and ice
458	if (config%do_lw_cloud_scattering) then
459	! Added for DWD (2020)
460	!NEC$ shortloop
461	do jb = 1, config%n_bands_lw
462	od_lw_cloud(jb,jlev,jcol) = od_lw_liq(jb) + od_lw_ice(jb)
463	if (scat_od_lw_liq(jb)+scat_od_lw_ice(jb) > 0.0_jprb) then
464	g_lw_cloud(jb,jlev,jcol) = (g_lw_liq(jb) * scat_od_lw_liq(jb) &
465	& + g_lw_ice(jb) * scat_od_lw_ice(jb)) &
466	& / (scat_od_lw_liq(jb)+scat_od_lw_ice(jb))
467	else
468	g_lw_cloud(jb,jlev,jcol) = 0.0_jprb
469	end if
470	ssa_lw_cloud(jb,jlev,jcol) = (scat_od_lw_liq(jb) + scat_od_lw_ice(jb)) &
471	& / (od_lw_liq(jb) + od_lw_ice(jb))
472	end do
473	else
474	! If longwave scattering is to be neglected then the
475	! best approximation is to set the optical depth equal
476	! to the absorption optical depth
477	! Added for DWD (2020)
478	!NEC$ shortloop
479	do jb = 1, config%n_bands_lw
480	od_lw_cloud(jb,jlev,jcol) = od_lw_liq(jb) - scat_od_lw_liq(jb) &
481	& + od_lw_ice(jb) - scat_od_lw_ice(jb)
482	end do
483	end if
484	! Added for DWD (2020)
485	!NEC$ shortloop
486	do jb = 1, config%n_bands_sw
487	od_sw_cloud(jb,jlev,jcol) = od_sw_liq(jb) + od_sw_ice(jb)
488	g_sw_cloud(jb,jlev,jcol) = (g_sw_liq(jb) * scat_od_sw_liq(jb) &
489	& + g_sw_ice(jb) * scat_od_sw_ice(jb)) &
490	& / (scat_od_sw_liq(jb) + scat_od_sw_ice(jb))
491	ssa_sw_cloud(jb,jlev,jcol) &
492	& = (scat_od_sw_liq(jb) + scat_od_sw_ice(jb)) / (od_sw_liq(jb) + od_sw_ice(jb))
493	end do
494	end if ! Cloud present
495	end do ! Loop over column
496	end do ! Loop over level
497
498	end associate
499
500	if (lhook) call dr_hook('radiation_cloud_optics:cloud_optics',1,hook_handle)
501
502	end subroutine cloud_optics
503
504	end module radiation_cloud_optics

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