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newmicro.F @ 588

Last change on this file since 588 was 588, checked in by (none), 19 years ago
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1	!
2	! $Header$
3	!
4	SUBROUTINE newmicro (paprs, pplay,ok_newmicro,
5	. t, pqlwp, pclc, pcltau, pclemi,
6	. pch, pcl, pcm, pct, pctlwp,
7	s xflwp, xfiwp, xflwc, xfiwc,
8	e ok_aie,
9	e sulfate, sulfate_pi,
10	e bl95_b0, bl95_b1,
11	s cldtaupi, re, fl)
12	IMPLICIT none
13	c======================================================================
14	c Auteur(s): Z.X. Li (LMD/CNRS) date: 19930910
15	c Objet: Calculer epaisseur optique et emmissivite des nuages
16	c======================================================================
17	c Arguments:
18	c t-------input-R-temperature
19	c pqlwp---input-R-eau liquide nuageuse dans l'atmosphere (kg/kg)
20	c pclc----input-R-couverture nuageuse pour le rayonnement (0 a 1)
21	c
22	c ok_aie--input-L-apply aerosol indirect effect or not
23	c sulfate-input-R-sulfate aerosol mass concentration [um/m^3]
24	c sulfate_pi-input-R-dito, pre-industrial value
25	c bl95_b0-input-R-a parameter, may be varied for tests (s-sea, l-land)
26	c bl95_b1-input-R-a parameter, may be varied for tests ( -"- )
27	c
28	c cldtaupi-output-R-pre-industrial value of cloud optical thickness,
29	c needed for the diagnostics of the aerosol indirect
30	c radiative forcing (see radlwsw)
31	c re------output-R-Cloud droplet effective radius multiplied by fl [um]
32	c fl------output-R-Denominator to re, introduced to avoid problems in
33	c the averaging of the output. fl is the fraction of liquid
34	c water clouds within a grid cell
35	c pcltau--output-R-epaisseur optique des nuages
36	c pclemi--output-R-emissivite des nuages (0 a 1)
37	c======================================================================
38	C
39	#include "YOMCST.h"
40	c
41	#include "dimensions.h"
42	#include "dimphy.h"
43	#include "nuage.h"
44	REAL paprs(klon,klev+1), pplay(klon,klev)
45	REAL t(klon,klev)
46	c
47	REAL pclc(klon,klev)
48	REAL pqlwp(klon,klev)
49	REAL pcltau(klon,klev), pclemi(klon,klev)
50	c
51	REAL pct(klon), pctlwp(klon), pch(klon), pcl(klon), pcm(klon)
52	c
53	LOGICAL lo
54	c
55	REAL cetahb, cetamb
56	PARAMETER (cetahb = 0.45, cetamb = 0.80)
57	C
58	INTEGER i, k
59	cIM: 091003 REAL zflwp, zradef, zfice, zmsac
60	REAL zflwp(klon), zradef, zfice, zmsac
61	cIM: 091003 rajout
62	REAL xflwp(klon), xfiwp(klon)
63	REAL xflwc(klon,klev), xfiwc(klon,klev)
64	c
65	REAL radius, rad_chaud
66	cc PARAMETER (rad_chau1=13.0, rad_chau2=9.0, rad_froid=35.0)
67	ccc PARAMETER (rad_chaud=15.0, rad_froid=35.0)
68	c sintex initial PARAMETER (rad_chaud=10.0, rad_froid=30.0)
69	REAL coef, coef_froi, coef_chau
70	PARAMETER (coef_chau=0.13, coef_froi=0.09)
71	REAL seuil_neb, t_glace
72	PARAMETER (seuil_neb=0.001, t_glace=273.0-15.0)
73	INTEGER nexpo ! exponentiel pour glace/eau
74	PARAMETER (nexpo=6)
75	ccc PARAMETER (nexpo=1)
76
77	c -- sb:
78	logical ok_newmicro
79	c parameter (ok_newmicro=.FALSE.)
80	cIM: 091003 real rel, tc, rei, zfiwp
81	real rel, tc, rei, zfiwp(klon)
82	real k_liq, k_ice0, k_ice, DF
83	parameter (k_liq=0.0903, k_ice0=0.005) ! units=m2/g
84	parameter (DF=1.66) ! diffusivity factor
85	c sb --
86	cjq for the aerosol indirect effect
87	cjq introduced by Johannes Quaas (quaas@lmd.jussieu.fr), 27/11/2003
88	cjq
89	LOGICAL ok_aie ! Apply AIE or not?
90	LOGICAL ok_a1lwpdep ! a1 LWP dependent?
91
92	REAL sulfate(klon, klev) ! sulfate aerosol mass concentration [ug m-3]
93	REAL cdnc(klon, klev) ! cloud droplet number concentration [m-3]
94	REAL re(klon, klev) ! cloud droplet effective radius [um]
95	REAL sulfate_pi(klon, klev) ! sulfate aerosol mass concentration [ug m-3] (pre-industrial value)
96	REAL cdnc_pi(klon, klev) ! cloud droplet number concentration [m-3] (pi value)
97	REAL re_pi(klon, klev) ! cloud droplet effective radius [um] (pi value)
98
99	REAL fl(klon, klev) ! xliq * rneb (denominator to re; fraction of liquid water clouds within the grid cell)
100
101	REAL bl95_b0, bl95_b1 ! Parameter in B&L 95-Formula
102
103	REAL cldtaupi(klon, klev) ! pre-industrial cloud opt thickness for diag
104	cjq-end
105	c
106	c Calculer l'epaisseur optique et l'emmissivite des nuages
107	c
108	cIM inversion des DO
109	DO i = 1, klon
110	xflwp(i)=0.
111	xfiwp(i)=0.
112	DO k = 1, klev
113	c
114	xflwc(i,k)=0.
115	xfiwc(i,k)=0.
116	c
117	rad_chaud = rad_chau1
118	IF (k.LE.3) rad_chaud = rad_chau2
119	pclc(i,k) = MAX(pclc(i,k), seuil_neb)
120	zflwp(i) = 1000.*pqlwp(i,k)/RG/pclc(i,k)
121	. *(paprs(i,k)-paprs(i,k+1))
122	zfice = 1.0 - (t(i,k)-t_glace) / (273.13-t_glace)
123	zfice = MIN(MAX(zfice,0.0),1.0)
124	zfice = zfice**nexpo
125	radius = rad_chaud * (1.-zfice) + rad_froid * zfice
126	coef = coef_chau * (1.-zfice) + coef_froi * zfice
127	pcltau(i,k) = 3.0/2.0 * zflwp(i) / radius
128	pclemi(i,k) = 1.0 - EXP( - coef * zflwp(i))
129
130	if (ok_newmicro) then
131
132	c -- liquid/ice cloud water paths:
133
134	zfice = 1.0 - (t(i,k)-t_glace) / (273.13-t_glace)
135	zfice = MIN(MAX(zfice,0.0),1.0)
136
137	zflwp(i) = 1000.(1.-zfice)pqlwp(i,k)/pclc(i,k)
138	: *(paprs(i,k)-paprs(i,k+1))/RG
139	zfiwp(i) = 1000.zficepqlwp(i,k)/pclc(i,k)
140	: *(paprs(i,k)-paprs(i,k+1))/RG
141
142	xflwp(i) = xflwp(i)+ (1.-zfice)*pqlwp(i,k)
143	: *(paprs(i,k)-paprs(i,k+1))/RG
144	xfiwp(i) = xfiwp(i)+ zfice*pqlwp(i,k)
145	: *(paprs(i,k)-paprs(i,k+1))/RG
146
147	cIM Total Liquid/Ice water content
148	xflwc(i,k) = xflwc(i,k)+(1.-zfice)*pqlwp(i,k)
149	xfiwc(i,k) = xfiwc(i,k)+zfice*pqlwp(i,k)
150	cIM In-Cloud Liquid/Ice water content
151	c xflwc(i,k) = xflwc(i,k)+(1.-zfice)*pqlwp(i,k)/pclc(i,k)
152	c xfiwc(i,k) = xfiwc(i,k)+zfice*pqlwp(i,k)/pclc(i,k)
153
154	c -- effective cloud droplet radius (microns):
155
156	c for liquid water clouds:
157	IF (ok_aie) THEN
158	! Formula "D" of Boucher and Lohmann, Tellus, 1995
159	!
160	cdnc(i,k) = 10.*(bl95_b0+bl95_b1
161	. log(MAX(sulfate(i,k),1.e-4))/log(10.))*1.e6 !-m-3
162	! Cloud droplet number concentration (CDNC) is restricted
163	! to be within [20, 1000 cm^3]
164	!
165	cdnc(i,k)=MIN(1000.e6,MAX(20.e6,cdnc(i,k)))
166	!
167	!
168	cdnc_pi(i,k) = 10.*(bl95_b0+bl95_b1
169	. log(MAX(sulfate_pi(i,k),1.e-4))/log(10.))*1.e6 !-m-3
170	cdnc_pi(i,k)=MIN(1000.e6,MAX(20.e6,cdnc_pi(i,k)))
171	!
172	!
173	! air density: pplay(i,k) / (RD * zT(i,k))
174	! factor 1.1: derive effective radius from volume-mean radius
175	! factor 1000 is the water density
176	! _chaud means that this is the CDR for liquid water clouds
177	!
178	rad_chaud =
179	. 1.1 * ( (pqlwp(i,k) * pplay(i,k) / (RD * T(i,k)) )
180	. / (4./3. * RPI * 1000. * cdnc(i,k)) )**(1./3.)
181	!
182	! Convert to um. CDR shall be at least 3 um.
183	!
184	c rad_chaud = MAX(rad_chaud*1.e6, 3.)
185	rad_chaud = MAX(rad_chaud*1.e6, 5.)
186
187	! Pre-industrial cloud opt thickness
188	!
189	! "radius" is calculated as rad_chaud above (plus the
190	! ice cloud contribution) but using cdnc_pi instead of
191	! cdnc.
192	radius =
193	. 1.1 * ( (pqlwp(i,k) * pplay(i,k) / (RD * T(i,k)) )
194	. / (4./3. * RPI * 1000. * cdnc_pi(i,k)) )**(1./3.)
195	radius = MAX(radius*1.e6, 5.)
196
197	tc = t(i,k)-273.15
198	rei = 0.71*tc + 61.29
199	if (tc.le.-81.4) rei = 3.5
200	if (zflwp(i).eq.0.) radius = 1.
201	if (zfiwp(i).eq.0. .or. rei.le.0.) rei = 1.
202	cldtaupi(i,k) = 3.0/2.0 * zflwp(i) / radius
203	. + zfiwp(i) * (3.448e-03 + 2.431/rei)
204	ENDIF ! ok_aie
205	! For output diagnostics
206	!
207	! Cloud droplet effective radius [um]
208	!
209	! we multiply here with f * xl (fraction of liquid water
210	! clouds in the grid cell) to avoid problems in the
211	! averaging of the output.
212	! In the output of IOIPSL, derive the real cloud droplet
213	! effective radius as re/fl
214	!
215	fl(i,k) = pclc(i,k)*(1.-zfice)
216	re(i,k) = rad_chaud*fl(i,k)
217
218	c-jq end
219
220	rel = rad_chaud
221	c for ice clouds: as a function of the ambiant temperature
222	c [formula used by Iacobellis and Somerville (2000), with an
223	c asymptotical value of 3.5 microns at T<-81.4 C added to be
224	c consistent with observations of Heymsfield et al. 1986]:
225	tc = t(i,k)-273.15
226	rei = 0.71*tc + 61.29
227	if (tc.le.-81.4) rei = 3.5
228
229	c -- cloud optical thickness :
230
231	c [for liquid clouds, traditional formula,
232	c for ice clouds, Ebert & Curry (1992)]
233
234	if (zflwp(i).eq.0.) rel = 1.
235	if (zfiwp(i).eq.0. .or. rei.le.0.) rei = 1.
236	pcltau(i,k) = 3.0/2.0 * ( zflwp(i)/rel )
237	. + zfiwp(i) * (3.448e-03 + 2.431/rei)
238
239	c -- cloud infrared emissivity:
240
241	c [the broadband infrared absorption coefficient is parameterized
242	c as a function of the effective cld droplet radius]
243
244	c Ebert and Curry (1992) formula as used by Kiehl & Zender (1995):
245	k_ice = k_ice0 + 1.0/rei
246
247	pclemi(i,k) = 1.0
248	. - EXP( - coef_chauzflwp(i) - DFk_ice*zfiwp(i) )
249
250	endif ! ok_newmicro
251
252	lo = (pclc(i,k) .LE. seuil_neb)
253	IF (lo) pclc(i,k) = 0.0
254	IF (lo) pcltau(i,k) = 0.0
255	IF (lo) pclemi(i,k) = 0.0
256
257	IF (lo) cldtaupi(i,k) = 0.0
258	IF (.NOT.ok_aie) cldtaupi(i,k)=pcltau(i,k)
259	ENDDO
260	ENDDO
261	ccc DO k = 1, klev
262	ccc DO i = 1, klon
263	ccc t(i,k) = t(i,k)
264	ccc pclc(i,k) = MAX( 1.e-5 , pclc(i,k) )
265	ccc lo = pclc(i,k) .GT. (2.*1.e-5)
266	ccc zflwp = pqlwp(i,k)1000.(paprs(i,k)-paprs(i,k+1))
267	ccc . /(rg*pclc(i,k))
268	ccc zradef = 10.0 + (1.-sigs(k))*45.0
269	ccc pcltau(i,k) = 1.5 * zflwp / zradef
270	ccc zfice=1.0-MIN(MAX((t(i,k)-263.)/(273.-263.),0.0),1.0)
271	ccc zmsac = 0.13(1.0-zfice) + 0.08zfice
272	ccc pclemi(i,k) = 1.-EXP(-zmsac*zflwp)
273	ccc if (.NOT.lo) pclc(i,k) = 0.0
274	ccc if (.NOT.lo) pcltau(i,k) = 0.0
275	ccc if (.NOT.lo) pclemi(i,k) = 0.0
276	ccc ENDDO
277	ccc ENDDO
278	cccccc print*, 'pas de nuage dans le rayonnement'
279	cccccc DO k = 1, klev
280	cccccc DO i = 1, klon
281	cccccc pclc(i,k) = 0.0
282	cccccc pcltau(i,k) = 0.0
283	cccccc pclemi(i,k) = 0.0
284	cccccc ENDDO
285	cccccc ENDDO
286	C
287	C COMPUTE CLOUD LIQUID PATH AND TOTAL CLOUDINESS
288	C
289	DO i = 1, klon
290	pct(i)=1.0
291	pch(i)=1.0
292	pcm(i) = 1.0
293	pcl(i) = 1.0
294	pctlwp(i) = 0.0
295	ENDDO
296	C
297	DO k = klev, 1, -1
298	DO i = 1, klon
299	pctlwp(i) = pctlwp(i)
300	. + pqlwp(i,k)*(paprs(i,k)-paprs(i,k+1))/RG
301	pct(i) = pct(i)*(1.0-pclc(i,k))
302	if (pplay(i,k).LE.cetahb*paprs(i,1))
303	. pch(i) = pch(i)*(1.0-pclc(i,k))
304	if (pplay(i,k).GT.cetahb*paprs(i,1) .AND.
305	. pplay(i,k).LE.cetamb*paprs(i,1))
306	. pcm(i) = pcm(i)*(1.0-pclc(i,k))
307	if (pplay(i,k).GT.cetamb*paprs(i,1))
308	. pcl(i) = pcl(i)*(1.0-pclc(i,k))
309	ENDDO
310	ENDDO
311	C
312	DO i = 1, klon
313	pct(i)=1.-pct(i)
314	pch(i)=1.-pch(i)
315	pcm(i)=1.-pcm(i)
316	pcl(i)=1.-pcl(i)
317	ENDDO
318	C
319	RETURN
320	END

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