--- MITgcm/pkg/seaice/groatb.F	2002/11/11 22:01:21	1.1
+++ MITgcm/pkg/seaice/groatb.F	2003/05/23 17:51:22	1.1.2.8
@@ -0,0 +1,136 @@
+C 
+
+#include "SEAICE_OPTIONS.h"
+ 
+CStartOfInterface
+      SUBROUTINE groatb( A22, myThid )
+C     /==========================================================\
+C     | SUBROUTINE groatb                                        |
+C     | o Calculate ice growth                                   |
+C     |==========================================================|
+C     \==========================================================/
+      IMPLICIT NONE
+ 
+C     === Global variables ===
+#include "SIZE.h"
+#include "EEPARAMS.h"
+#include "PARAMS.h"
+#include "DYNVARS.h"
+#include "FFIELDS.h"
+#include "SEAICE.h"
+#include "SEAICE_FFIELDS.h"
+       COMMON /SEAICE_BOUND_RL/
+     &    MAX_HEFF, MIN_ATEMP, MIN_LWDOWN, MAX_TICE, MIN_TICE,
+     &    SEAICE_EPS, SEAICE_EPS_SQ
+      _RL SEAICE_EPS, SEAICE_EPS_SQ
+      _RL MAX_HEFF, MIN_ATEMP, MIN_LWDOWN, MAX_TICE, MIN_TICE
+
+C     === Routine arguments ===
+C     myThid - Thread no. that called this routine.
+      _RL A22
+      INTEGER myThid
+CEndOfInterface
+ 
+#ifdef ALLOW_SEAICE
+
+C     === Local variables ===
+C     i,j,bi,bj - Loop counters
+
+      INTEGER i, j, bi, bj
+      INTEGER KOPEN
+      _RL U1, V1, SPEED_SQ
+      _RL HICE (1-OLx:sNx+OLx, 1-OLy:sNy+OLy)
+      _RL UG   (1-OLx:sNx+OLx, 1-OLy:sNy+OLy)
+
+#ifdef SEAICE_MULTILEVEL
+      INTEGER it
+      _RL RK
+      _RL HICEP(1-OLx:sNx+OLx, 1-OLy:sNy+OLy)
+      _RL FICEP(1-OLx:sNx+OLx, 1-OLy:sNy+OLy)
+#endif
+
+C if this is not done before then do it here
+      _EXCH_XY_R8(UWIND, myThid)
+      _EXCH_XY_R8(VWIND, myThid)
+
+c$taf loop = parallel
+      DO bj=myByLo(myThid),myByHi(myThid)
+c$taf loop = parallel
+       DO bi=myBxLo(myThid),myBxHi(myThid)
+
+C DETERMINE AMOUNT OF OPEN WATER AND ICE THICKNESS
+        DO J=1,sNy
+         DO I=1,sNx
+          AREA(I,J,2,bi,bj)=MAX(A22,AREA(I,J,2,bi,bj))
+          FHEFF(I,J,bi,bj)=0.0 _d 0
+#ifdef SEAICE_MULTILEVEL
+          FICEP(I,J)=0.0 _d 0
+#endif
+          HICE(I,J)=HEFF(I,J,2,bi,bj)/AREA(I,J,2,bi,bj)
+         ENDDO
+        ENDDO
+
+C NOW DETERMINE MIXED LAYER TEMPERATURE
+        DO J=1,sNy
+         DO I=1,sNx
+          TMIX(I,J,bi,bj)=theta(I,J,1,bi,bj)+273.16 _d +00
+#ifdef SEAICE_DEBUG
+          TMIX(I,J,bi,bj)=MAX(TMIX(I,J,bi,bj),271.2 _d +00)
+#endif
+         ENDDO
+        ENDDO
+
+        DO J=1,sNy
+         DO I=1,sNx
+          U1=0.25 _d 0*(UWIND(I+1,J+1,bi,bj)+UWIND(I+1,J,bi,bj)
+     1      +UWIND(I,J+1,bi,bj)+UWIND(I,J,bi,bj))
+          V1=0.25 _d 0*(VWIND(I+1,J+1,bi,bj)+VWIND(I+1,J,bi,bj)
+     1      +VWIND(I,J+1,bi,bj)+VWIND(I,J,bi,bj))
+          SPEED_SQ = U1**2 + V1**2
+          IF ( SPEED_SQ .LE. SEAICE_EPS_SQ ) THEN
+             UG(I,J)=SEAICE_EPS
+          ELSE
+             UG(I,J)=SQRT(SPEED_SQ)
+          ENDIF
+         ENDDO
+        ENDDO
+
+C NOW DETERMINE GROWTH RATES
+C FIRST DO OPEN WATER
+        KOPEN=-1
+        CALL BUDGET(UG, TMIX, HICE, FO, KOPEN, bi, bj)
+C NOW DO ICE
+        KOPEN=1
+#ifdef SEAICE_MULTILEVEL
+        DO IT=1,7
+         DO J=1,sNy
+          DO I=1,sNx
+           RK=IT*1.0
+           HICEP(I,J)=(HICE(I,J)/7.0 _d 0)*((2.0 _d 0*RK)-1.0 _d 0)
+           TICE(I,J,bi,bj)=TICES(I,J,IT,bi,bj)
+          ENDDO
+         ENDDO
+         CALL BUDGET(UG, TICE, HICEP, FICE, KOPEN, bi, bj)
+         DO J=1,sNy
+          DO I=1,sNx
+           FICEP(I,J)=(FICE(I,J,bi,bj)/7.0 _d 0)+FICEP(I,J)
+           TICES(I,J,IT,bi,bj)=TICE(I,J,bi,bj)
+          ENDDO
+         ENDDO
+        ENDDO
+        DO J=1,sNy
+         DO I=1,sNx
+          FICE(I,J,bi,bj)=FICEP(I,J)
+         ENDDO
+        ENDDO
+#else  /* SEAICE_MULTILEVEL */
+        CALL BUDGET(UG, TICE, HICE, FICE, KOPEN, bi, bj)
+#endif /* SEAICE_MULTILEVEL */
+
+       ENDDO
+      ENDDO
+
+#endif /* ALLOW_SEAICE */
+
+      RETURN
+      END