| 1 |
C $Header: /u/gcmpack/models/MITgcmUV/pkg/aim/phy_convmf.F,v 1.2 2001/02/02 21:36:29 adcroft Exp $ |
| 2 |
C $Name: $ |
| 3 |
|
| 4 |
cmolt SUBROUTINE CONVMF (PSA,SE,QA,QSAT, |
| 5 |
SUBROUTINE CONVMF (PSA,TA,QA,QSAT, |
| 6 |
* IDEPTH,CBMF,PRECNV,DFSE,DFQA, |
| 7 |
I myThid) |
| 8 |
C-- |
| 9 |
C-- SUBROUTINE CONVMF (PSA,SE,QA,QSAT, |
| 10 |
C-- * IDEPTH,CBMF,PRECNV,DFSE,DFQA) |
| 11 |
C-- |
| 12 |
C-- Purpose: Compute convective fluxes of dry static energy and moisture |
| 13 |
C-- using a simplified mass-flux scheme |
| 14 |
C-- Input: PSA = norm. surface pressure [p/p0] (2-dim) |
| 15 |
C-- SE = dry static energy (3-dim) |
| 16 |
C-- QA = specific humidity [g/kg] (3-dim) |
| 17 |
C-- QSAT = saturation spec. hum. [g/kg] (3-dim) |
| 18 |
C-- Output: IDEPTH = convection depth in layers (2-dim) |
| 19 |
C-- CBMF = cloud-base mass flux (2-dim) |
| 20 |
C-- PRECNV = convective precipitation [g/(m^2 s)] (2-dim) |
| 21 |
C-- DFSE = net flux of d.s.en. into each atm. layer (3-dim) |
| 22 |
C-- DFQA = net flux of sp.hum. into each atm. layer (3-dim) |
| 23 |
C-- |
| 24 |
|
| 25 |
IMPLICIT rEAL*8 ( A-H,O-Z) |
| 26 |
INTEGER myThid |
| 27 |
|
| 28 |
C Resolution parameters |
| 29 |
C |
| 30 |
#include "EEPARAMS.h" |
| 31 |
|
| 32 |
#include "atparam.h" |
| 33 |
#include "atparam1.h" |
| 34 |
#include "Lev_def.h" |
| 35 |
C |
| 36 |
INTEGER NLON, NLAT, NLEV, NGP |
| 37 |
PARAMETER ( NLON=IX, NLAT=IL, NLEV=KX, NGP=NLON*NLAT ) |
| 38 |
C |
| 39 |
C Physical constants + functions of sigma and latitude |
| 40 |
C |
| 41 |
#include "com_physcon.h" |
| 42 |
C |
| 43 |
C Convection constants |
| 44 |
C |
| 45 |
#include "com_cnvcon.h" |
| 46 |
C |
| 47 |
REAL PSA(NGP), SE(NGP,NLEV), QA(NGP,NLEV), QSAT(NGP,NLEV) |
| 48 |
C |
| 49 |
INTEGER IDEPTH(NGP) |
| 50 |
REAL CBMF(NGP), PRECNV(NGP), DFSE(NGP,NLEV), DFQA(NGP,NLEV) |
| 51 |
C |
| 52 |
INTEGER ITOP(NGP) |
| 53 |
REAL SM(NGP,NLEV), ENTR(NGP,2:NLEV-1) |
| 54 |
REAL FM0(NGP), DENTR(NGP) |
| 55 |
C |
| 56 |
REAL Th(NGP,NLEV), Ta(NGP,NLEV) |
| 57 |
REAL dThdp(NGP,NLEV), dThdpHat(NGP,NLEV) |
| 58 |
REAL stab(NGP,NLEV) |
| 59 |
REAL Prefw(NLEV), Prefs(NLEV) |
| 60 |
DATA Prefs / 75., 250., 500., 775., 950./ |
| 61 |
DATA Prefw / 0., 150., 350., 650., 900./ |
| 62 |
REAL Pground |
| 63 |
DATA pground /1000./ |
| 64 |
REAL FDMUS |
| 65 |
|
| 66 |
INTEGER J, K, K1 |
| 67 |
C |
| 68 |
C 1. Initialization of output and workspace arrays |
| 69 |
C |
| 70 |
DO J=1,NGP |
| 71 |
FM0(J)=0. |
| 72 |
IF ( NLEVxy(J,myThid) .NE. 0 ) THEN |
| 73 |
FM0(J)=P0*DSIG(NLEVxy(J,myThid))/(GG*TRCNV*3600) |
| 74 |
ENDIF |
| 75 |
DENTR(J)=ENTMAX/(SIG(NLEV-1)-0.5) |
| 76 |
ENDDO |
| 77 |
C |
| 78 |
DO K=1,NLEV |
| 79 |
DO J=1,NGP |
| 80 |
DFSE(J,K)=0.0 |
| 81 |
DFQA(J,K)=0.0 |
| 82 |
ENDDO |
| 83 |
ENDDO |
| 84 |
C |
| 85 |
C |
| 86 |
DO J=1,NGP |
| 87 |
ITOP(J) =NLEVxy(J,myThid) |
| 88 |
CBMF(J) =0.0 |
| 89 |
PRECNV(J)=0.0 |
| 90 |
ENDDO |
| 91 |
C |
| 92 |
C Saturation moist static energy |
| 93 |
cmolt DO J=1,NGP |
| 94 |
cmolt DO K=1,NLEVxy(J,myThid) |
| 95 |
cmolt SM(J,K)=SE(J,K)+ALHC*QSAT(J,K) |
| 96 |
cmolt ENDDO |
| 97 |
cmolt ENDDO |
| 98 |
C |
| 99 |
C Entrainment profile (up to sigma = 0.5) |
| 100 |
DO J=1,NGP |
| 101 |
DO K=2,NLEVxy(J,myThid)-1 |
| 102 |
ENTR(J,K)=MAX(0.,SIG(K)-0.5)*DENTR(J) |
| 103 |
ENDDO |
| 104 |
ENDDO |
| 105 |
C |
| 106 |
C-- 2. Check of conditions for convection |
| 107 |
C |
| 108 |
C 2.1 Conditional instability |
| 109 |
C |
| 110 |
cmolt DO J=1,NGP |
| 111 |
cmolt DO K=NLEVxy(J,myThid)-2,2,-1 |
| 112 |
cmolt SMB=SM(J,K)+WVI(K,2)*(SM(J,K+1)-SM(J,K)) |
| 113 |
cmolt IF (SM(J,NLEVxy(J,myThid)).GT.SMB) ITOP(J)=K |
| 114 |
cmolt ENDDO |
| 115 |
cmolt ENDDO |
| 116 |
C |
| 117 |
C New writing of the Conditional stability |
| 118 |
C ---------------------------------------- |
| 119 |
DO J=1,NGP |
| 120 |
DO k=1,NLEVxy(J,myThid) |
| 121 |
Th(J,K)=Ta(J,K)*(Pground/Prefs(k))**(RD/CP) |
| 122 |
ENDDO |
| 123 |
ENDDO |
| 124 |
C |
| 125 |
DO J=1,NGP |
| 126 |
dThdp(J,1)=0. |
| 127 |
IF ( NLEVxy(J,myThid) .NE. 0 ) THEN |
| 128 |
dThdp(J,NLEVxy(J,myThid))=0. |
| 129 |
ENDIF |
| 130 |
DO k=2,NLEVxy(J,myThid) |
| 131 |
dThdp(J,K-1)=(Th(J,K-1)-Th(J,K)) |
| 132 |
& *((Prefw(k)/Pground)**(RD/CP))*CP |
| 133 |
ENDDO |
| 134 |
ENDDO |
| 135 |
C |
| 136 |
DO J=1,NGP |
| 137 |
IF ( NLEVxy(J,myThid) .NE. 0 ) THEN |
| 138 |
dThdpHat(J,NLEVxy(J,myThid))=dThdp(J,NLEVxy(J,myThid)) |
| 139 |
ENDIF |
| 140 |
ENDDO |
| 141 |
C |
| 142 |
DO J=1,NGP |
| 143 |
DO k=NLEVxy(J,myThid)-1,2,-1 |
| 144 |
dThdpHat(J,K)=dThdpHat(J,K+1)+dThdp(J,k) |
| 145 |
ENDDO |
| 146 |
ENDDO |
| 147 |
C |
| 148 |
DO J=1,NGP |
| 149 |
DO k=2,NLEVxy(J,myThid)-1 |
| 150 |
stab(J,K)=dThdpHat(J,K)+ALHC*(QSAT(J,K)-QSAT(J,NLEVxy(J,myThid))) |
| 151 |
& -WVI(K,2)*(dThdp(J,K) +ALHC*(QSAT(J,K) -QSAT(J,K+1)) ) |
| 152 |
ENDDO |
| 153 |
ENDDO |
| 154 |
C |
| 155 |
DO J=1,NGP |
| 156 |
DO K=NLEVxy(J,myThid)-2,2,-1 |
| 157 |
if(stab(J,K).lt.0.) ITOP(J)=K |
| 158 |
ENDDO |
| 159 |
ENDDO |
| 160 |
C |
| 161 |
C 2.2 Humidity exceeding prescribed threshold |
| 162 |
C |
| 163 |
DO J=1,NGP |
| 164 |
IF ( NLEVxy(J,myThid) .NE. 0 ) THEN |
| 165 |
IF (QA(J,NLEVxy(J,myThid)).LT.RHBL*QSAT(J,NLEVxy(J,myThid))) |
| 166 |
& ITOP(J)=NLEVxy(J,myThid) |
| 167 |
ENDIF |
| 168 |
IDEPTH(J)=NLEVxy(J,myThid)-ITOP(J) |
| 169 |
ENDDO |
| 170 |
C |
| 171 |
C-- 3. Convection over selected grid-points |
| 172 |
C |
| 173 |
DO 300 J=1,NGP |
| 174 |
IF (ITOP(J).EQ.NLEVxy(J,myThid)) GO TO 300 |
| 175 |
C |
| 176 |
C 3.1 Boundary layer (cloud base) |
| 177 |
C |
| 178 |
K =NLEVxy(J,myThid) |
| 179 |
K1=K-1 |
| 180 |
C |
| 181 |
C Dry static energy and moisture at upper boundary |
| 182 |
cch SB=SE(J,K1)+WVI(K1,2)*(SE(J,K)-SE(J,K1)) |
| 183 |
QB=QA(J,K1)+WVI(K1,2)*(QA(J,K)-QA(J,K1)) |
| 184 |
cch QB=QA(J,K1) |
| 185 |
C |
| 186 |
C Cloud-base mass flux |
| 187 |
DQSAT=MAX(QSAT(J,K)-QB,0.05*QSAT(J,K)) |
| 188 |
FMASS=FM0(J)*PSA(J)*(QA(J,K)-RHBL*QSAT(J,K))/DQSAT |
| 189 |
CBMF(J)=FMASS |
| 190 |
C |
| 191 |
C Upward fluxes at upper boundary |
| 192 |
cch FUS=FMASS*SE(J,K) |
| 193 |
C_jmc FUQ=FMASS*QSAT(J,K) |
| 194 |
FUQ=FMASS*MAX( QSAT(J,K), MIN(QB,QA(J,K)) ) |
| 195 |
C |
| 196 |
C Downward fluxes at upper boundary |
| 197 |
cch FDS=FMASS*SB |
| 198 |
FDQ=FMASS*QB |
| 199 |
C |
| 200 |
C Net flux of dry static energy and moisture |
| 201 |
cch DFSE(J,K)=FDS-FUS |
| 202 |
DFSE(J,K)=FMASS*dThdp(J,K1)*(1-WVI(K1,2)) |
| 203 |
FDMUS=FMASS*dThdp(J,K1)*(1-WVI(K1,2)) |
| 204 |
DFQA(J,K)=FDQ-FUQ |
| 205 |
C |
| 206 |
C 3.2 Intermediate layers (entrainment) |
| 207 |
C |
| 208 |
DO K=NLEVxy(J,myThid)-1,ITOP(J)+1,-1 |
| 209 |
K1=K-1 |
| 210 |
C |
| 211 |
C Fluxes at lower boundary |
| 212 |
cch DFSE(J,K)=FUS-FDS |
| 213 |
DFQA(J,K)=FUQ-FDQ |
| 214 |
C |
| 215 |
C Mass entrainment |
| 216 |
ENMASS=ENTR(J,K)*PSA(J)*FMASS |
| 217 |
FMASS=FMASS+ENMASS |
| 218 |
C |
| 219 |
C Upward fluxes at upper boundary |
| 220 |
cch FUS=FUS+ENMASS*SE(J,K) |
| 221 |
FUQ=FUQ+ENMASS*QA(J,K) |
| 222 |
C |
| 223 |
C Downward fluxes at upper boundary |
| 224 |
cch SB=SE(J,K1)+WVI(K1,2)*(SE(J,K)-SE(J,K1)) |
| 225 |
QB=QA(J,K1)+WVI(K1,2)*(QA(J,K)-QA(J,K1)) |
| 226 |
cch QB=QA(J,K1) |
| 227 |
cch FDS=FMASS*SB |
| 228 |
FDQ=FMASS*QB |
| 229 |
C |
| 230 |
C Net flux of dry static energy and moisture |
| 231 |
cch DFSE(J,K)=DFSE(J,K)+FDS-FUS |
| 232 |
DFSE(J,K)=FMASS*(1-WVI(K1,2))*dThdp(J,K1)+ |
| 233 |
& (FMASS-ENMASS)*WVI(K,2)*dThdp(J,K) |
| 234 |
FDMUS=FDMUS+ FMASS*(1-WVI(K1,2))*dThdp(J,K1)+ |
| 235 |
& (FMASS-ENMASS)*WVI(K,2)*dThdp(J,K) |
| 236 |
DFQA(J,K)=DFQA(J,K)+FDQ-FUQ |
| 237 |
C |
| 238 |
ENDDO |
| 239 |
c |
| 240 |
C 3.3 Top layer (condensation and detrainment) |
| 241 |
C |
| 242 |
K=ITOP(J) |
| 243 |
C |
| 244 |
C Flux of convective precipitation |
| 245 |
QSATB=QSAT(J,K)+WVI(K,2)*(QSAT(J,K+1)-QSAT(J,K)) |
| 246 |
PRECNV(J)=MAX(FUQ-FMASS*QSATB,0.0) |
| 247 |
C |
| 248 |
C Net flux of dry static energy and moisture |
| 249 |
cch DFSE(J,K)=FUS-FDS+ALHC*PRECNV(J) |
| 250 |
DFSE(J,K)=-FDMUS+ALHC*PRECNV(J) |
| 251 |
DFQA(J,K)=FUQ-FDQ-PRECNV(J) |
| 252 |
C |
| 253 |
300 CONTINUE |
| 254 |
C |
| 255 |
RETURN |
| 256 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph