dgoldberg/streamice/streamice_adv_front.F

C $Header: /u/gcmpack/MITgcm/pkg/streamice/streamice_init_varia.F,v 1.6 2011/06/29 16:24:10 dng Exp $
C $Name:  $

#include "STREAMICE_OPTIONS.h"

C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|

CBOP
      SUBROUTINE STREAMICE_ADV_FRONT ( myThid, time_step )

C     /============================================================\
C     | SUBROUTINE                                                 |   
C     | o                                                          |
C     |============================================================|
C     |                                                            |
C     \============================================================/
      IMPLICIT NONE

C     === Global variables ===
#include "SIZE.h"
#include "GRID.h"
#include "EEPARAMS.h"
#include "PARAMS.h"
#include "STREAMICE.h"
#include "STREAMICE_ADV.h"

      INTEGER myThid
      _RL time_step

#ifdef ALLOW_STREAMICE

      INTEGER i, j, bi, bj, k, n_flux, iter_count, iter_flag
      INTEGER Gi, Gj
      INTEGER new_partial(4)
      _RL href, rho, partial_vol, tot_flux, hpot

      rho = streamice_density
      iter_count = 0
      iter_flag = 1

      DO WHILE (iter_flag .eq. 1)
      
       iter_flag = 0

       IF (iter_count .gt. 0) then
        DO bj=myByLo(myThid),myByHi(myThid)
         DO bi=myBxLo(myThid),myBxHi(myThid)
          DO j=1-OLy,sNy+OLy
           DO i=1-OLx,sNx+OLx
            hflux_x_SI(i,j,bi,bj)=hflux_x_SI2(i,j,bi,bj)
            hflux_y_SI(i,j,bi,bj)=hflux_y_SI2(i,j,bi,bj)
            hflux_x_SI2(i,j,bi,bj) = 0. _d 0
            hflux_y_SI2(i,j,bi,bj) = 0. _d 0
           ENDDO
          ENDDO
         ENDDO
        ENDDO        
       ENDIF

       iter_count = iter_count + 1

       DO bj=myByLo(myThid),myByHi(myThid)
        DO bi=myBxLo(myThid),myBxHi(myThid)
         DO j=1-1,sNy+1
          Gj = (myYGlobalLo-1)+(bj-1)*sNy+j
          IF ((Gj .ge. 1) .and. (Gj .le. Ny)) THEN
           DO i=1-1,sNx+1
            Gi = (myXGlobalLo-1)+(bi-1)*sNx+i
            IF ((Gi .ge. 1) .and. (Gi .le. Nx) .and. 
     &          (STREAMICE_Hmask(i,j,bi,bj).eq.0.0 .or.
     &           STREAMICE_Hmask(i,j,bi,bj).eq.2.0)) THEN
             n_flux = 0
             href = 0. _d 0
             tot_flux = 0. _d 0

             IF (hflux_x_SI(i,j,bi,bj).gt. 0. _d 0) THEN
              n_flux = n_flux + 1
              href = href + H_streamice(i-1,j,bi,bj)
              tot_flux = tot_flux + hflux_x_SI(i,j,bi,bj) * 
     &         dxG(i,j,bi,bj) * time_step
              hflux_x_SI(i,j,bi,bj) = 0. _d 0
             ENDIF

             IF (hflux_x_SI(i+1,j,bi,bj).lt. 0. _d 0) THEN
              n_flux = n_flux + 1
              href = href + H_streamice(i+1,j,bi,bj)
              tot_flux = tot_flux - hflux_x_SI(i+1,j,bi,bj) * 
     &         dxG(i+1,j,bi,bj) * time_step
              hflux_x_SI(i+1,j,bi,bj) = 0. _d 0
             ENDIF

             IF (hflux_y_SI(i,j,bi,bj).gt. 0. _d 0) THEN
              n_flux = n_flux + 1
              href = href + H_streamice(i,j-1,bi,bj)
              tot_flux = tot_flux + hflux_y_SI(i,j,bi,bj) * 
     &         dyG(i,j,bi,bj) * time_step
              hflux_y_SI(i,j,bi,bj) = 0. _d 0
             ENDIF

             IF (hflux_y_SI(i,j+1,bi,bj).lt. 0. _d 0) THEN
              n_flux = n_flux + 1
              href = href + H_streamice(i,j+1,bi,bj)
              tot_flux = tot_flux - hflux_y_SI(i,j+1,bi,bj) * 
     &         dyG(i,j+1,bi,bj) * time_step
              hflux_y_SI(i,j+1,bi,bj) = 0. _d 0
             ENDIF
 
             IF (n_flux .gt. 0) THEN

              href = href / real(n_flux)
              partial_vol = H_streamice (i,j,bi,bj) * 
     &         area_shelf_streamice (i,j,bi,bj) + tot_flux
              hpot = partial_vol * recip_rA(i,j,bi,bj)
              
              IF (hpot .eq. href) THEN ! cell is exactly covered, no overflow
                STREAMICE_hmask (i,j,bi,bj) = 1.0
                H_streamice (i,j,bi,bj) = href
                area_shelf_streamice(i,j,bi,bj) = 
     &           rA(i,j,bi,bj)
              ELSEIF (hpot .lt. href) THEN ! cell still unfilled

!                PRINT *, "PARTIAL CELL INCREASED", tot_flux, i,
!      &         area_shelf_streamice (i,j,bi,bj),
!      &         H_streamice (i,j,bi,bj)

               STREAMICE_hmask (i,j,bi,bj) = 2.0
               area_shelf_streamice (i,j,bi,bj) = partial_vol / href
               H_streamice (i,j,bi,bj) = href
              ELSE ! cell is filled - do overflow

!                PRINT *, "CELL FILLED"

               STREAMICE_hmask (i,j,bi,bj) = 1.0
               area_shelf_streamice(i,j,bi,bj) = 
     &           rA(i,j,bi,bj)

               
               partial_vol = partial_vol - href * rA(i,j,bi,bj)

               iter_flag  = 1

               n_flux = 0 ; 
               DO k=1,4
                new_partial (:) = 0
               ENDDO

               DO k=1,2
                IF (STREAMICE_ufacemask(i-1+k,j,bi,bj).eq.2.0) THEN  ! at a permanent calving boundary - no advance allowed
                   n_flux = n_flux + 1
                ELSEIF (STREAMICE_hmask(i+2*k-3,j,bi,bj).eq.0 _d 0) THEN ! adjacent cell is completely ice free
                   n_flux = n_flux + 1
                   new_partial (k) = 1
                ENDIF
               ENDDO
               DO k=1,2
                IF (STREAMICE_vfacemask (i,j-1+k,bi,bj).eq.2.0) THEN
                    n_flux = n_flux + 1
                ELSEIF (STREAMICE_hmask(i,j+2*k-3,bi,bj).eq.0 _d 0) THEN
                    n_flux = n_flux + 1
                    new_partial (k+2) = 1
                ENDIF
               ENDDO

               IF (n_flux .eq. 0) THEN ! there is nowhere to put the extra ice!
                H_streamice(i,j,bi,bj) = href + partial_vol *
     &             recip_rA(i,j,bi,bj)
               ELSE
                H_streamice(i,j,bi,bj) = href

                DO k=1,2
                 IF (new_partial(k) .eq. 1) THEN
                  hflux_x_SI2(i-1+k,j,bi,bj) = 
     &             partial_vol/time_step/real(n_flux)/
     &               dxG(i-1+k,j,bi,bj)
                 ENDIF
                ENDDO

                DO k=1,2
                 IF (new_partial(k+2) .eq. 1) THEN
                  hflux_y_SI2(i,j-1+k,bi,bj) = 
     &             partial_vol/time_step/real(n_flux)/
     &               dxG(i,j-1+k,bi,bj)
                 ENDIF
                ENDDO

               ENDIF
              ENDIF
             ENDIF
            ENDIF
           ENDDO
          ENDIF
         ENDDO
        ENDDO
       ENDDO
      ENDDO

      IF (iter_count.gt.1) THEN
       PRINT *, "FRONT ADVANCE: ", iter_count, " ITERATIONS"
      ENDIF


#endif
      RETURN
      END
1	C $Header: /u/gcmpack/MITgcm/pkg/streamice/streamice_init_varia.F,v 1.6 2011/06/29 16:24:10 dng Exp $
2	C $Name: $
3
4	#include "STREAMICE_OPTIONS.h"
5
6	C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-\|--+----\|
7
8	CBOP
9	SUBROUTINE STREAMICE_ADV_FRONT ( myThid, time_step )
10
11	C /============================================================\
12	C \| SUBROUTINE \|
13	C \| o \|
14	C \|============================================================\|
15	C \| \|
16	C \============================================================/
17	IMPLICIT NONE
18
19	C === Global variables ===
20	#include "SIZE.h"
21	#include "GRID.h"
22	#include "EEPARAMS.h"
23	#include "PARAMS.h"
24	#include "STREAMICE.h"
25	#include "STREAMICE_ADV.h"
26
27	INTEGER myThid
28	_RL time_step
29
30	#ifdef ALLOW_STREAMICE
31
32	INTEGER i, j, bi, bj, k, n_flux, iter_count, iter_flag
33	INTEGER Gi, Gj
34	INTEGER new_partial(4)
35	_RL href, rho, partial_vol, tot_flux, hpot
36
37	rho = streamice_density
38	iter_count = 0
39	iter_flag = 1
40
41	DO WHILE (iter_flag .eq. 1)
42
43	iter_flag = 0
44
45	IF (iter_count .gt. 0) then
46	DO bj=myByLo(myThid),myByHi(myThid)
47	DO bi=myBxLo(myThid),myBxHi(myThid)
48	DO j=1-OLy,sNy+OLy
49	DO i=1-OLx,sNx+OLx
50	hflux_x_SI(i,j,bi,bj)=hflux_x_SI2(i,j,bi,bj)
51	hflux_y_SI(i,j,bi,bj)=hflux_y_SI2(i,j,bi,bj)
52	hflux_x_SI2(i,j,bi,bj) = 0. _d 0
53	hflux_y_SI2(i,j,bi,bj) = 0. _d 0
54	ENDDO
55	ENDDO
56	ENDDO
57	ENDDO
58	ENDIF
59
60	iter_count = iter_count + 1
61
62	DO bj=myByLo(myThid),myByHi(myThid)
63	DO bi=myBxLo(myThid),myBxHi(myThid)
64	DO j=1-1,sNy+1
65	Gj = (myYGlobalLo-1)+(bj-1)*sNy+j
66	IF ((Gj .ge. 1) .and. (Gj .le. Ny)) THEN
67	DO i=1-1,sNx+1
68	Gi = (myXGlobalLo-1)+(bi-1)*sNx+i
69	IF ((Gi .ge. 1) .and. (Gi .le. Nx) .and.
70	& (STREAMICE_Hmask(i,j,bi,bj).eq.0.0 .or.
71	& STREAMICE_Hmask(i,j,bi,bj).eq.2.0)) THEN
72	n_flux = 0
73	href = 0. _d 0
74	tot_flux = 0. _d 0
75
76	IF (hflux_x_SI(i,j,bi,bj).gt. 0. _d 0) THEN
77	n_flux = n_flux + 1
78	href = href + H_streamice(i-1,j,bi,bj)
79	tot_flux = tot_flux + hflux_x_SI(i,j,bi,bj) *
80	& dxG(i,j,bi,bj) * time_step
81	hflux_x_SI(i,j,bi,bj) = 0. _d 0
82	ENDIF
83
84	IF (hflux_x_SI(i+1,j,bi,bj).lt. 0. _d 0) THEN
85	n_flux = n_flux + 1
86	href = href + H_streamice(i+1,j,bi,bj)
87	tot_flux = tot_flux - hflux_x_SI(i+1,j,bi,bj) *
88	& dxG(i+1,j,bi,bj) * time_step
89	hflux_x_SI(i+1,j,bi,bj) = 0. _d 0
90	ENDIF
91
92	IF (hflux_y_SI(i,j,bi,bj).gt. 0. _d 0) THEN
93	n_flux = n_flux + 1
94	href = href + H_streamice(i,j-1,bi,bj)
95	tot_flux = tot_flux + hflux_y_SI(i,j,bi,bj) *
96	& dyG(i,j,bi,bj) * time_step
97	hflux_y_SI(i,j,bi,bj) = 0. _d 0
98	ENDIF
99
100	IF (hflux_y_SI(i,j+1,bi,bj).lt. 0. _d 0) THEN
101	n_flux = n_flux + 1
102	href = href + H_streamice(i,j+1,bi,bj)
103	tot_flux = tot_flux - hflux_y_SI(i,j+1,bi,bj) *
104	& dyG(i,j+1,bi,bj) * time_step
105	hflux_y_SI(i,j+1,bi,bj) = 0. _d 0
106	ENDIF
107
108	IF (n_flux .gt. 0) THEN
109
110	href = href / real(n_flux)
111	partial_vol = H_streamice (i,j,bi,bj) *
112	& area_shelf_streamice (i,j,bi,bj) + tot_flux
113	hpot = partial_vol * recip_rA(i,j,bi,bj)
114
115	IF (hpot .eq. href) THEN ! cell is exactly covered, no overflow
116	STREAMICE_hmask (i,j,bi,bj) = 1.0
117	H_streamice (i,j,bi,bj) = href
118	area_shelf_streamice(i,j,bi,bj) =
119	& rA(i,j,bi,bj)
120	ELSEIF (hpot .lt. href) THEN ! cell still unfilled
121
122	! PRINT *, "PARTIAL CELL INCREASED", tot_flux, i,
123	! & area_shelf_streamice (i,j,bi,bj),
124	! & H_streamice (i,j,bi,bj)
125
126	STREAMICE_hmask (i,j,bi,bj) = 2.0
127	area_shelf_streamice (i,j,bi,bj) = partial_vol / href
128	H_streamice (i,j,bi,bj) = href
129	ELSE ! cell is filled - do overflow
130
131	! PRINT *, "CELL FILLED"
132
133	STREAMICE_hmask (i,j,bi,bj) = 1.0
134	area_shelf_streamice(i,j,bi,bj) =
135	& rA(i,j,bi,bj)
136
137
138	partial_vol = partial_vol - href * rA(i,j,bi,bj)
139
140	iter_flag = 1
141
142	n_flux = 0 ;
143	DO k=1,4
144	new_partial (:) = 0
145	ENDDO
146
147	DO k=1,2
148	IF (STREAMICE_ufacemask(i-1+k,j,bi,bj).eq.2.0) THEN ! at a permanent calving boundary - no advance allowed
149	n_flux = n_flux + 1
150	ELSEIF (STREAMICE_hmask(i+2*k-3,j,bi,bj).eq.0 _d 0) THEN ! adjacent cell is completely ice free
151	n_flux = n_flux + 1
152	new_partial (k) = 1
153	ENDIF
154	ENDDO
155	DO k=1,2
156	IF (STREAMICE_vfacemask (i,j-1+k,bi,bj).eq.2.0) THEN
157	n_flux = n_flux + 1
158	ELSEIF (STREAMICE_hmask(i,j+2*k-3,bi,bj).eq.0 _d 0) THEN
159	n_flux = n_flux + 1
160	new_partial (k+2) = 1
161	ENDIF
162	ENDDO
163
164	IF (n_flux .eq. 0) THEN ! there is nowhere to put the extra ice!
165	H_streamice(i,j,bi,bj) = href + partial_vol *
166	& recip_rA(i,j,bi,bj)
167	ELSE
168	H_streamice(i,j,bi,bj) = href
169
170	DO k=1,2
171	IF (new_partial(k) .eq. 1) THEN
172	hflux_x_SI2(i-1+k,j,bi,bj) =
173	& partial_vol/time_step/real(n_flux)/
174	& dxG(i-1+k,j,bi,bj)
175	ENDIF
176	ENDDO
177
178	DO k=1,2
179	IF (new_partial(k+2) .eq. 1) THEN
180	hflux_y_SI2(i,j-1+k,bi,bj) =
181	& partial_vol/time_step/real(n_flux)/
182	& dxG(i,j-1+k,bi,bj)
183	ENDIF
184	ENDDO
185
186	ENDIF
187	ENDIF
188	ENDIF
189	ENDIF
190	ENDDO
191	ENDIF
192	ENDDO
193	ENDDO
194	ENDDO
195	ENDDO
196
197	IF (iter_count.gt.1) THEN
198	PRINT *, "FRONT ADVANCE: ", iter_count, " ITERATIONS"
199	ENDIF
200
201
202
203	#endif
204	RETURN
205	END