Changeset 164 for LMDZ.3.3/trunk

Timestamp:

Nov 17, 2000, 9:59:23 AM (24 years ago)

Author:

lmdz

Message:

Correction du bug sur les precip negatives. O.Boucher et J.Quaas
LF

File:

• LMDZ.3.3/trunk/libf/phylmd/conflx.F (modified) (6 diffs)

LMDZ.3.3/trunk/libf/phylmd/conflx.F

@@ -103 +103 @@
       DO k = 1, klev+1
       DO i = 1, klon
-         pmflxr(i,k) = 0.0
-         pmflxs(i,k) = 0.0
+         zmflxr(i,k) = 0.0
+         zmflxs(i,k) = 0.0
       ENDDO
       ENDDO
@@ -981 +981 @@
       ENDDO
 c
+      ldcum(1)=ldcum(1)
+c
       is = 0
       DO i = 1, klon
@@ -1039 +1041 @@
       REAL plude(klon,klev)
       REAL pdmfup(klon,klev), pdpmel(klon,klev)
-      REAL pdmfdp(klon,klev)
+cjq The variable maxpdmfdp(klon) has been introduced by Olivier Boucher
+cjq 14/11/00 to fix the problem with the negative precipitation.      
+      REAL pdmfdp(klon,klev), maxpdmfdp(klon) 
       REAL prfl(klon), psfl(klon)
       REAL pmflxr(klon,klev+1), pmflxs(klon,klev+1)
@@ -1160 +1164 @@
          ENDIF
          IF (pten(i,k).GT.RTT) THEN
-           pmflxr(i,k+1)=pmflxr(i,k)+pdmfup(i,k)+pdmfdp(i,k)+pdpmel(i,k)
+         pmflxr(i,k+1)=pmflxr(i,k)+pdmfup(i,k)+pdmfdp(i,k)+pdpmel(i,k)
+         pmflxs(i,k+1)=pmflxs(i,k)-pdpmel(i,k)
          ELSE
-           pmflxs(i,k+1)=pmflxs(i,k)+pdmfup(i,k)+pdmfdp(i,k)-pdpmel(i,k)
+           pmflxs(i,k+1)=pmflxs(i,k)+pdmfup(i,k)+pdmfdp(i,k)
+           pmflxr(i,k+1)=pmflxr(i,k)
          ENDIF
 c        si la precipitation est negative, on ajuste le plux du
 c        panache descendant pour eliminer la negativite
          IF ((pmflxr(i,k+1)+pmflxs(i,k+1)).LT.0.0) THEN
+cjq            write (*,*) 'total precip negative. rain ',pmflxr(i,k+1),
+cjq     .                  'snow ',pmflxs(i,k+1) 
             pdmfdp(i,k) = -pmflxr(i,k)-pmflxs(i,k)-pdmfup(i,k)
             pmflxr(i,k+1) = 0.0
@@ -1176 +1184 @@
       ENDDO
 c
+cjq The new variable is initialized here.
+cjq It contains the humidity which is fed to the downdraft
+cjq by evaporation of precipitation in the column below the base
+cjq of convection.
+cjq 
+cjq In the former version, this term has been subtracted from precip
+cjq as well as the evaporation.
+cjq      
+      DO i = 1, klon 
+         maxpdmfdp(i)=0.0
+      ENDDO
+      DO k = ktopm2, klev
+         DO i = 1, klon
+         if (k.GE.kcbot(i)) then
+         maxpdmfdp(i)=maxpdmfdp(i)+pdmfdp(i,k)
+         endif
+         ENDDO
+      ENDDO
+cjq End of initialization
+c      
       DO k = ktopm2, klev
       DO i = 1, klon
@@ -1189 +1217 @@
             zrfln=MAX(zrnew,0.)
             zdrfl=MIN(0.,zrfln-zrfl)
+cjq At least the amount of precipiation needed to feed the downdraft
+cjq with humidity below the base of convection has to be left and can't
+cjq be evaporated (surely the evaporation can't be positive):            
+            zdrfl=MAX(zdrfl,
+     .            MIN(-pmflxr(i,k)-pmflxs(i,k)-maxpdmfdp(i),0.0))
+cjq End of insertion
+c            
             zdenom=1.0/MAX(1.0E-20,pmflxr(i,k)+pmflxs(i,k))
             IF (pten(i,k).GT.RTT) THEN