Sources/phylmd/nuage.f

module nuage_m

  IMPLICIT none

contains

  SUBROUTINE nuage (paprs, pplay, t, pqlwp, pclc, pcltau, pclemi, pch, pcl, &
       pcm, pct, pctlwp, ok_aie, sulfate, sulfate_pi, bl95_b0, bl95_b1, &
       cldtaupi, re, fl)
    !
    ! From LMDZ4/libf/phylmd/nuage.F, version 1.1.1.1 2004/05/19 12:53:07
    !
    use dimens_m
    use dimphy
    use nr_util, only: pi
    use SUPHEC_M
    !======================================================================
    ! Auteur(s): Z.X. Li (LMD/CNRS) date: 19930910
    ! Objet: Calculer epaisseur optique et emmissivite des nuages
    !======================================================================
    ! Arguments:
    ! t-------input-R-temperature
    ! pqlwp---input-R-eau liquide nuageuse dans l'atmosphere (kg/kg)
    ! pclc----input-R-couverture nuageuse pour le rayonnement (0 a 1)
    ! ok_aie--input-L-apply aerosol indirect effect or not
    ! sulfate-input-R-sulfate aerosol mass concentration [um/m^3]
    ! sulfate_pi-input-R-dito, pre-industrial value
    ! bl95_b0-input-R-a parameter, may be varied for tests (s-sea, l-land)
    ! bl95_b1-input-R-a parameter, may be varied for tests (    -"-      )
    !
    ! cldtaupi-output-R-pre-industrial value of cloud optical thickness,
    !                   needed for the diagnostics of the aerosol indirect
    !                   radiative forcing (see radlwsw)
    ! re------output-R-Cloud droplet effective radius multiplied by fl [um]
    ! fl------output-R-Denominator to re, introduced to avoid problems in
    !                  the averaging of the output. fl is the fraction of liquid
    !                  water clouds within a grid cell
    !
    ! pcltau--output-R-epaisseur optique des nuages
    ! pclemi--output-R-emissivite des nuages (0 a 1)
    !======================================================================
    !
    !
    REAL, intent(in):: paprs(klon,klev+1)
    real, intent(in):: pplay(klon,klev)
    REAL, intent(in):: t(klon,klev)
    !
    REAL pclc(klon,klev)
    REAL pqlwp(klon,klev)
    REAL pcltau(klon,klev), pclemi(klon,klev)
    !
    REAL pct(klon), pctlwp(klon), pch(klon), pcl(klon), pcm(klon)
    !
    LOGICAL lo
    !
    REAL cetahb, cetamb
    PARAMETER (cetahb = 0.45, cetamb = 0.80)
    !
    INTEGER i, k
    REAL zflwp, zfice
    !
    REAL radius, rad_froid, rad_chaud, rad_chau1, rad_chau2
    PARAMETER (rad_chau1=13.0, rad_chau2=9.0, rad_froid=35.0)
    !cc      PARAMETER (rad_chaud=15.0, rad_froid=35.0)
    ! sintex initial      PARAMETER (rad_chaud=10.0, rad_froid=30.0)
    REAL coef, coef_froi, coef_chau
    PARAMETER (coef_chau=0.13, coef_froi=0.09)
    REAL seuil_neb, t_glace
    PARAMETER (seuil_neb=0.001, t_glace=273.0-15.0)
    INTEGER nexpo ! exponentiel pour glace/eau
    PARAMETER (nexpo=6)

    !jq for the aerosol indirect effect
    !jq introduced by Johannes Quaas (quaas@lmd.jussieu.fr), 27/11/2003
    !jq
    LOGICAL ok_aie            ! Apply AIE or not?

    REAL sulfate(klon, klev)  ! sulfate aerosol mass concentration [ug m-3]
    REAL cdnc(klon, klev)     ! cloud droplet number concentration [m-3]
    REAL re(klon, klev)       ! cloud droplet effective radius [um]
    REAL, intent(in):: sulfate_pi(klon, klev)  ! sulfate aerosol mass concentration [ug m-3] (pre-industrial value)
    REAL cdnc_pi(klon, klev)     ! cloud droplet number concentration [m-3] (pi value)

    REAL fl(klon, klev)  ! xliq * rneb (denominator to re ; fraction of liquid water clouds within the grid cell)

    REAL bl95_b0, bl95_b1     ! Parameter in B&L 95-Formula

    REAL cldtaupi(klon, klev) ! pre-industrial cloud opt thickness for diag

    !cc      PARAMETER (nexpo=1)
    !
    ! Calculer l'epaisseur optique et l'emmissivite des nuages
    !
    DO k = 1, klev
       DO i = 1, klon
          rad_chaud = rad_chau1
          IF (k.LE.3) rad_chaud = rad_chau2

          pclc(i,k) = MAX(pclc(i,k), seuil_neb)
          zflwp = 1000.*pqlwp(i,k)/RG/pclc(i,k) &
               *(paprs(i,k)-paprs(i,k+1))
          zfice = 1.0 - (t(i,k)-t_glace) / (273.13-t_glace)
          zfice = MIN(MAX(zfice,0.0),1.0)
          zfice = zfice**nexpo

          IF (ok_aie) THEN
             ! Formula "D" of Boucher and Lohmann, Tellus, 1995
             !
             cdnc(i,k) = 10.**(bl95_b0+bl95_b1* &
                  log(MAX(sulfate(i,k),1.e-4))/log(10.))*1.e6 !-m-3
             ! Cloud droplet number concentration (CDNC) is restricted
             ! to be within [20, 1000 cm^3]
             !
             cdnc(i,k)=MIN(1000.e6,MAX(20.e6,cdnc(i,k)))
             cdnc_pi(i,k) = 10.**(bl95_b0+bl95_b1* &
                  log(MAX(sulfate_pi(i,k),1.e-4))/log(10.))*1.e6 !-m-3
             cdnc_pi(i,k)=MIN(1000.e6,MAX(20.e6,cdnc_pi(i,k)))
             !
             !
             ! air density: pplay(i,k) / (RD * zT(i,k))
             ! factor 1.1: derive effective radius from volume-mean radius
             ! factor 1000 is the water density
             ! _chaud means that this is the CDR for liquid water clouds
             !
             rad_chaud =  &
                  1.1 * ( (pqlwp(i,k) * pplay(i,k) / (RD * T(i,k)) )   &
                  / (4./3. * PI * 1000. * cdnc(i,k)) )**(1./3.)
             !
             ! Convert to um. CDR shall be at least 3 um.
             !
             rad_chaud = MAX(rad_chaud*1.e6, 3.)

             ! For output diagnostics
             !
             ! Cloud droplet effective radius [um]
             !
             ! we multiply here with f * xl (fraction of liquid water
             ! clouds in the grid cell) to avoid problems in the
             ! averaging of the output.
             ! In the output of IOIPSL, derive the real cloud droplet
             ! effective radius as re/fl
             !
             fl(i,k) = pclc(i,k)*(1.-zfice)
             re(i,k) = rad_chaud*fl(i,k)

             ! Pre-industrial cloud opt thickness
             !
             ! "radius" is calculated as rad_chaud above (plus the
             ! ice cloud contribution) but using cdnc_pi instead of
             ! cdnc.
             radius = MAX(1.1e6 * ( (pqlwp(i,k)*pplay(i,k)/(RD*T(i,k)))   &
                  / (4./3.*PI*1000.*cdnc_pi(i,k)) )**(1./3.),  &
                  3.) * (1.-zfice) + rad_froid * zfice
             cldtaupi(i,k) = 3.0/2.0 * zflwp / radius

          END IF                  ! ok_aie

          radius = rad_chaud * (1.-zfice) + rad_froid * zfice
          coef = coef_chau * (1.-zfice) + coef_froi * zfice
          pcltau(i,k) = 3.0/2.0 * zflwp / radius
          pclemi(i,k) = 1.0 - EXP( - coef * zflwp)
          lo = (pclc(i,k) .LE. seuil_neb)
          IF (lo) pclc(i,k) = 0.0
          IF (lo) pcltau(i,k) = 0.0
          IF (lo) pclemi(i,k) = 0.0

          IF (.NOT.ok_aie) cldtaupi(i,k)=pcltau(i,k)
       END DO
    END DO
    !
    ! COMPUTE CLOUD LIQUID PATH AND TOTAL CLOUDINESS
    !
    DO i = 1, klon
       pct(i)=1.0
       pch(i)=1.0
       pcm(i) = 1.0
       pcl(i) = 1.0
       pctlwp(i) = 0.0
    END DO
    !
    DO k = klev, 1, -1
       DO i = 1, klon
          pctlwp(i) = pctlwp(i)  &
               + pqlwp(i,k)*(paprs(i,k)-paprs(i,k+1))/RG
          pct(i) = pct(i)*(1.0-pclc(i,k))
          if (pplay(i,k).LE.cetahb*paprs(i,1)) &
               pch(i) = pch(i)*(1.0-pclc(i,k))
          if (pplay(i,k).GT.cetahb*paprs(i,1) .AND. &
               pplay(i,k).LE.cetamb*paprs(i,1))  &
               pcm(i) = pcm(i)*(1.0-pclc(i,k))
          if (pplay(i,k).GT.cetamb*paprs(i,1)) &
               pcl(i) = pcl(i)*(1.0-pclc(i,k))
       END DO
    END DO
    !
    DO i = 1, klon
       pct(i)=1.-pct(i)
       pch(i)=1.-pch(i)
       pcm(i)=1.-pcm(i)
       pcl(i)=1.-pcl(i)
    END DO
    !
  END SUBROUTINE nuage

end module nuage_m
1	module nuage_m
2
3	IMPLICIT none
4
5	contains
6
7	SUBROUTINE nuage (paprs, pplay, t, pqlwp, pclc, pcltau, pclemi, pch, pcl, &
8	pcm, pct, pctlwp, ok_aie, sulfate, sulfate_pi, bl95_b0, bl95_b1, &
9	cldtaupi, re, fl)
10	!
11	! From LMDZ4/libf/phylmd/nuage.F, version 1.1.1.1 2004/05/19 12:53:07
12	!
13	use dimens_m
14	use dimphy
15	use nr_util, only: pi
16	use SUPHEC_M
17	!======================================================================
18	! Auteur(s): Z.X. Li (LMD/CNRS) date: 19930910
19	! Objet: Calculer epaisseur optique et emmissivite des nuages
20	!======================================================================
21	! Arguments:
22	! t-------input-R-temperature
23	! pqlwp---input-R-eau liquide nuageuse dans l'atmosphere (kg/kg)
24	! pclc----input-R-couverture nuageuse pour le rayonnement (0 a 1)
25	! ok_aie--input-L-apply aerosol indirect effect or not
26	! sulfate-input-R-sulfate aerosol mass concentration [um/m^3]
27	! sulfate_pi-input-R-dito, pre-industrial value
28	! bl95_b0-input-R-a parameter, may be varied for tests (s-sea, l-land)
29	! bl95_b1-input-R-a parameter, may be varied for tests ( -"- )
30	!
31	! cldtaupi-output-R-pre-industrial value of cloud optical thickness,
32	! needed for the diagnostics of the aerosol indirect
33	! radiative forcing (see radlwsw)
34	! re------output-R-Cloud droplet effective radius multiplied by fl [um]
35	! fl------output-R-Denominator to re, introduced to avoid problems in
36	! the averaging of the output. fl is the fraction of liquid
37	! water clouds within a grid cell
38	!
39	! pcltau--output-R-epaisseur optique des nuages
40	! pclemi--output-R-emissivite des nuages (0 a 1)
41	!======================================================================
42	!
43	!
44	REAL, intent(in):: paprs(klon,klev+1)
45	real, intent(in):: pplay(klon,klev)
46	REAL, intent(in):: t(klon,klev)
47	!
48	REAL pclc(klon,klev)
49	REAL pqlwp(klon,klev)
50	REAL pcltau(klon,klev), pclemi(klon,klev)
51	!
52	REAL pct(klon), pctlwp(klon), pch(klon), pcl(klon), pcm(klon)
53	!
54	LOGICAL lo
55	!
56	REAL cetahb, cetamb
57	PARAMETER (cetahb = 0.45, cetamb = 0.80)
58	!
59	INTEGER i, k
60	REAL zflwp, zfice
61	!
62	REAL radius, rad_froid, rad_chaud, rad_chau1, rad_chau2
63	PARAMETER (rad_chau1=13.0, rad_chau2=9.0, rad_froid=35.0)
64	!cc PARAMETER (rad_chaud=15.0, rad_froid=35.0)
65	! sintex initial PARAMETER (rad_chaud=10.0, rad_froid=30.0)
66	REAL coef, coef_froi, coef_chau
67	PARAMETER (coef_chau=0.13, coef_froi=0.09)
68	REAL seuil_neb, t_glace
69	PARAMETER (seuil_neb=0.001, t_glace=273.0-15.0)
70	INTEGER nexpo ! exponentiel pour glace/eau
71	PARAMETER (nexpo=6)
72
73	!jq for the aerosol indirect effect
74	!jq introduced by Johannes Quaas (quaas@lmd.jussieu.fr), 27/11/2003
75	!jq
76	LOGICAL ok_aie ! Apply AIE or not?
77
78	REAL sulfate(klon, klev) ! sulfate aerosol mass concentration [ug m-3]
79	REAL cdnc(klon, klev) ! cloud droplet number concentration [m-3]
80	REAL re(klon, klev) ! cloud droplet effective radius [um]
81	REAL, intent(in):: sulfate_pi(klon, klev) ! sulfate aerosol mass concentration [ug m-3] (pre-industrial value)
82	REAL cdnc_pi(klon, klev) ! cloud droplet number concentration [m-3] (pi value)
83
84	REAL fl(klon, klev) ! xliq * rneb (denominator to re ; fraction of liquid water clouds within the grid cell)
85
86	REAL bl95_b0, bl95_b1 ! Parameter in B&L 95-Formula
87
88	REAL cldtaupi(klon, klev) ! pre-industrial cloud opt thickness for diag
89
90	!cc PARAMETER (nexpo=1)
91	!
92	! Calculer l'epaisseur optique et l'emmissivite des nuages
93	!
94	DO k = 1, klev
95	DO i = 1, klon
96	rad_chaud = rad_chau1
97	IF (k.LE.3) rad_chaud = rad_chau2
98
99	pclc(i,k) = MAX(pclc(i,k), seuil_neb)
100	zflwp = 1000.*pqlwp(i,k)/RG/pclc(i,k) &
101	*(paprs(i,k)-paprs(i,k+1))
102	zfice = 1.0 - (t(i,k)-t_glace) / (273.13-t_glace)
103	zfice = MIN(MAX(zfice,0.0),1.0)
104	zfice = zfice**nexpo
105
106	IF (ok_aie) THEN
107	! Formula "D" of Boucher and Lohmann, Tellus, 1995
108	!
109	cdnc(i,k) = 10.*(bl95_b0+bl95_b1 &
110	log(MAX(sulfate(i,k),1.e-4))/log(10.))*1.e6 !-m-3
111	! Cloud droplet number concentration (CDNC) is restricted
112	! to be within [20, 1000 cm^3]
113	!
114	cdnc(i,k)=MIN(1000.e6,MAX(20.e6,cdnc(i,k)))
115	cdnc_pi(i,k) = 10.*(bl95_b0+bl95_b1 &
116	log(MAX(sulfate_pi(i,k),1.e-4))/log(10.))*1.e6 !-m-3
117	cdnc_pi(i,k)=MIN(1000.e6,MAX(20.e6,cdnc_pi(i,k)))
118	!
119	!
120	! air density: pplay(i,k) / (RD * zT(i,k))
121	! factor 1.1: derive effective radius from volume-mean radius
122	! factor 1000 is the water density
123	! _chaud means that this is the CDR for liquid water clouds
124	!
125	rad_chaud = &
126	1.1 * ( (pqlwp(i,k) * pplay(i,k) / (RD * T(i,k)) ) &
127	/ (4./3. * PI * 1000. * cdnc(i,k)) )**(1./3.)
128	!
129	! Convert to um. CDR shall be at least 3 um.
130	!
131	rad_chaud = MAX(rad_chaud*1.e6, 3.)
132
133	! For output diagnostics
134	!
135	! Cloud droplet effective radius [um]
136	!
137	! we multiply here with f * xl (fraction of liquid water
138	! clouds in the grid cell) to avoid problems in the
139	! averaging of the output.
140	! In the output of IOIPSL, derive the real cloud droplet
141	! effective radius as re/fl
142	!
143	fl(i,k) = pclc(i,k)*(1.-zfice)
144	re(i,k) = rad_chaud*fl(i,k)
145
146	! Pre-industrial cloud opt thickness
147	!
148	! "radius" is calculated as rad_chaud above (plus the
149	! ice cloud contribution) but using cdnc_pi instead of
150	! cdnc.
151	radius = MAX(1.1e6 * ( (pqlwp(i,k)pplay(i,k)/(RDT(i,k))) &
152	/ (4./3.PI1000.cdnc_pi(i,k)) )*(1./3.), &
153	3.) * (1.-zfice) + rad_froid * zfice
154	cldtaupi(i,k) = 3.0/2.0 * zflwp / radius
155
156	END IF ! ok_aie
157
158	radius = rad_chaud * (1.-zfice) + rad_froid * zfice
159	coef = coef_chau * (1.-zfice) + coef_froi * zfice
160	pcltau(i,k) = 3.0/2.0 * zflwp / radius
161	pclemi(i,k) = 1.0 - EXP( - coef * zflwp)
162	lo = (pclc(i,k) .LE. seuil_neb)
163	IF (lo) pclc(i,k) = 0.0
164	IF (lo) pcltau(i,k) = 0.0
165	IF (lo) pclemi(i,k) = 0.0
166
167	IF (.NOT.ok_aie) cldtaupi(i,k)=pcltau(i,k)
168	END DO
169	END DO
170	!
171	! COMPUTE CLOUD LIQUID PATH AND TOTAL CLOUDINESS
172	!
173	DO i = 1, klon
174	pct(i)=1.0
175	pch(i)=1.0
176	pcm(i) = 1.0
177	pcl(i) = 1.0
178	pctlwp(i) = 0.0
179	END DO
180	!
181	DO k = klev, 1, -1
182	DO i = 1, klon
183	pctlwp(i) = pctlwp(i) &
184	+ pqlwp(i,k)*(paprs(i,k)-paprs(i,k+1))/RG
185	pct(i) = pct(i)*(1.0-pclc(i,k))
186	if (pplay(i,k).LE.cetahb*paprs(i,1)) &
187	pch(i) = pch(i)*(1.0-pclc(i,k))
188	if (pplay(i,k).GT.cetahb*paprs(i,1) .AND. &
189	pplay(i,k).LE.cetamb*paprs(i,1)) &
190	pcm(i) = pcm(i)*(1.0-pclc(i,k))
191	if (pplay(i,k).GT.cetamb*paprs(i,1)) &
192	pcl(i) = pcl(i)*(1.0-pclc(i,k))
193	END DO
194	END DO
195	!
196	DO i = 1, klon
197	pct(i)=1.-pct(i)
198	pch(i)=1.-pch(i)
199	pcm(i)=1.-pcm(i)
200	pcl(i)=1.-pcl(i)
201	END DO
202	!
203	END SUBROUTINE nuage
204
205	end module nuage_m