trunk/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	guez	175	module nuage_m
2
3	guez	51	IMPLICIT none
4	guez	3
5	guez	175	contains
6	guez	3
7	guez	175	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	guez	51
73	guez	175	!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	guez	51
78	guez	175	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	guez	51
84	guez	175	REAL fl(klon, klev) ! xliq * rneb (denominator to re ; fraction of liquid water clouds within the grid cell)
85	guez	51
86	guez	175	REAL bl95_b0, bl95_b1 ! Parameter in B&L 95-Formula
87	guez	51
88	guez	175	REAL cldtaupi(klon, klev) ! pre-industrial cloud opt thickness for diag
89	guez	51
90	guez	175	!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	guez	51
99	guez	175	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	guez	51
106	guez	175	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	guez	51
133	guez	175	! 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	guez	51
146	guez	175	! 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	guez	51
156	guez	175	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