source: LMDZ4/trunk/libf/phylmd/fonte_neige_mod.F90 @ 961

Last change on this file since 961 was 793, checked in by Laurent Fairhead, 17 years ago

Modifications suite a la transformation des fichiers include pour
qu'ils soient compatibles a la fois au format fixe et au format libre
Un bon nombre de fichiers *.inc du coup disparaissent
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[782]1!
2! $Header$
3!
4MODULE fonte_neige_mod
5!
6! This module will treat the process of snow, melting, accumulating, calving, in
7! case of simplified soil model.
8!
9!****************************************************************************************
10  USE dimphy, ONLY : klon
11
12  IMPLICIT NONE
13  SAVE
14
15! run_off_ter and run_off_lic are the runoff at the compressed grid knon for
16! land and land-ice respectively
17! Note: run_off_lic is used in mod_landice and therfore not private
18  REAL, ALLOCATABLE, DIMENSION(:), PRIVATE    :: run_off_ter
19  !$OMP THREADPRIVATE(run_off_ter)
20  REAL, ALLOCATABLE, DIMENSION(:)             :: run_off_lic
21  !$OMP THREADPRIVATE(run_off_lic)
22
23! run_off_lic_0 is the runoff at land-ice a time-step earlier, on the global 1D array grid
24  REAL, ALLOCATABLE, DIMENSION(:), PRIVATE    :: run_off_lic_0
25  !$OMP THREADPRIVATE(run_off_lic_0)
26 
27  REAL, PRIVATE                               :: tau_calv 
28  !$OMP THREADPRIVATE(tau_calv)
29  REAL, ALLOCATABLE, DIMENSION(:,:), PRIVATE  :: ffonte_global
30  !$OMP THREADPRIVATE(ffonte_global)
31  REAL, ALLOCATABLE, DIMENSION(:,:), PRIVATE  :: fqfonte_global
32  !$OMP THREADPRIVATE(fqfonte_global)
33  REAL, ALLOCATABLE, DIMENSION(:,:), PRIVATE  :: fqcalving_global
34  !$OMP THREADPRIVATE(fqcalving_global)
35
36CONTAINS
37!
38!****************************************************************************************
39!
40  SUBROUTINE fonte_neige_init(restart_runoff)
41
42! This subroutine allocates and initialize variables in the module.
43! The variable run_off_lic_0 is initialized to the field read from
44! restart file. The other variables are initialized to zero.
45!
[793]46    INCLUDE "indicesol.h"
[782]47!****************************************************************************************
48! Input argument
49    REAL, DIMENSION(klon), INTENT(IN) :: restart_runoff
50
51! Local variables
52    INTEGER                           :: error
53    CHARACTER (len = 80)              :: abort_message
54    CHARACTER (len = 20)              :: modname = 'fonte_neige_init'
55
56
57!****************************************************************************************
58! Allocate run-off at landice and initilize with field read from restart
59!
60!****************************************************************************************
61
62    ALLOCATE(run_off_lic_0(klon), stat = error)
63    IF (error /= 0) THEN
64       abort_message='Pb allocation run_off_lic'
65       CALL abort_gcm(modname,abort_message,1)
66    ENDIF
67    run_off_lic_0(:) = restart_runoff(:)
68
69!****************************************************************************************
70! Allocate other variables and initilize to zero
71!
72!****************************************************************************************
73    ALLOCATE(run_off_ter(klon), stat = error)
74    IF (error /= 0) THEN
75       abort_message='Pb allocation run_off_ter'
76       CALL abort_gcm(modname,abort_message,1)
77    ENDIF
78    run_off_ter(:) = 0.
79   
80    ALLOCATE(run_off_lic(klon), stat = error)
81    IF (error /= 0) THEN
82       abort_message='Pb allocation run_off_lic'
83       CALL abort_gcm(modname,abort_message,1)
84    ENDIF
85    run_off_lic(:) = 0.
86   
87    ALLOCATE(ffonte_global(klon,nbsrf))
88    IF (error /= 0) THEN
89       abort_message='Pb allocation ffonte_global'
90       CALL abort_gcm(modname,abort_message,1)
91    ENDIF
92    ffonte_global(:,:) = 0.0
93
94    ALLOCATE(fqfonte_global(klon,nbsrf))
95    IF (error /= 0) THEN
96       abort_message='Pb allocation fqfonte_global'
97       CALL abort_gcm(modname,abort_message,1)
98    ENDIF
99    fqfonte_global(:,:) = 0.0
100
101    ALLOCATE(fqcalving_global(klon,nbsrf))
102    IF (error /= 0) THEN
103       abort_message='Pb allocation fqcalving_global'
104       CALL abort_gcm(modname,abort_message,1)
105    ENDIF
106    fqcalving_global(:,:) = 0.0
107
108!****************************************************************************************
109! Read tau_calv
110!
111!****************************************************************************************
112    CALL conf_interface(tau_calv)
113
114
115  END SUBROUTINE fonte_neige_init
116!
117!****************************************************************************************
118!
119  SUBROUTINE fonte_neige( knon, nisurf, knindex, dtime, &
120       tsurf, precip_rain, precip_snow, &
121       snow, qsol, tsurf_new, evap)
122       
123! Routine de traitement de la fonte de la neige dans le cas du traitement
124! de sol simplifie!
125! LF 03/2001
126! input:
127!   knon         nombre de points a traiter
128!   nisurf       surface a traiter
129!   knindex      index des mailles valables pour surface a traiter
130!   dtime       
131!   tsurf        temperature de surface
132!   precip_rain  precipitations liquides
133!   precip_snow  precipitations solides
134!
135! input/output:
136!   snow         champs hauteur de neige
137!   qsol         hauteur d'eau contenu dans le sol
138!   tsurf_new    temperature au sol
139!   evap
140!
[793]141  INCLUDE "indicesol.h"
142  INCLUDE "dimensions.h"
143  INCLUDE "YOETHF.h"
144  INCLUDE "YOMCST.h"
145  INCLUDE "FCTTRE.h"
146  INCLUDE "clesphys.h"
[782]147
148! Input variables
149!****************************************************************************************
150    INTEGER, INTENT(IN)                  :: knon
151    INTEGER, INTENT(IN)                  :: nisurf
152    INTEGER, DIMENSION(klon), INTENT(IN) :: knindex
153    REAL   , INTENT(IN)                  :: dtime
154    REAL, DIMENSION(klon), INTENT(IN)    :: tsurf
155    REAL, DIMENSION(klon), INTENT(IN)    :: precip_rain
156    REAL, DIMENSION(klon), INTENT(IN)    :: precip_snow
157   
158! Input/Output variables
159!****************************************************************************************
160
161    REAL, DIMENSION(klon), INTENT(INOUT) :: snow
162    REAL, DIMENSION(klon), INTENT(INOUT) :: qsol
163    REAL, DIMENSION(klon), INTENT(INOUT) :: tsurf_new
164    REAL, DIMENSION(klon), INTENT(INOUT) :: evap
165
166! Local variables
167!****************************************************************************************
168
169    INTEGER               :: i, j
170    REAL                  :: fq_fonte
171    REAL                  :: coeff_rel
172    REAL, PARAMETER       :: snow_max=3000.
173    REAL, PARAMETER       :: max_eau_sol = 150.0
174!! PB temporaire en attendant mieux pour le modele de neige
175! REAL, parameter :: chasno = RLMLT/(2.3867E+06*0.15)
176    REAL, PARAMETER       :: chasno = 3.334E+05/(2.3867E+06*0.15)
177!IM cf JLD/ GKtest
178    REAL, PARAMETER       :: chaice = 3.334E+05/(2.3867E+06*0.15)
179! fin GKtest
180    REAL, DIMENSION(klon) :: ffonte
181    REAL, DIMENSION(klon) :: fqcalving, fqfonte
182    REAL, DIMENSION(klon) :: d_ts
183    REAL, DIMENSION(klon) :: bil_eau_s, snow_evap
184
185    LOGICAL               :: neige_fond
186
187!****************************************************************************************
188! Start calculation
189! - Initialization
190!
191!****************************************************************************************
192    coeff_rel = dtime/(tau_calv * rday)
193   
194    bil_eau_s(:) = 0.
195
196!****************************************************************************************
197! - Increment snow due to precipitation and evaporation
198! - Calculate the water balance due to precipitation and evaporation (bil_eau_s)
199!
200!****************************************************************************************
201    WHERE (precip_snow > 0.)
202       snow = snow + (precip_snow * dtime)
203    END WHERE
204
205    snow_evap = 0.
206    WHERE (evap > 0. )
207       snow_evap = MIN (snow / dtime, evap)
208       snow = snow - snow_evap * dtime
209       snow = MAX(0.0, snow)
210    END WHERE
211   
212    bil_eau_s(:) = (precip_rain(:) * dtime) - (evap(:) - snow_evap(:)) * dtime
213
214
215!****************************************************************************************
216! - Calculate melting snow
217! - Calculate calving and decrement snow, if there are to much snow
218! - Update temperature at surface
219!
220!****************************************************************************************
221
222    ffonte(:) = 0.0
223    fqcalving(:) = 0.0
224    fqfonte(:) = 0.0
225    DO i = 1, knon
226       ! Y'a-t-il fonte de neige?
227       neige_fond = ((snow(i) > epsfra .OR. nisurf == is_sic .OR. nisurf == is_lic) &
228            .AND. tsurf_new(i) >= RTT)
229       IF (neige_fond) THEN
230          fq_fonte     = MIN( MAX((tsurf_new(i)-RTT )/chasno,0.0),snow(i))
231          ffonte(i)    = fq_fonte * RLMLT/dtime
232          fqfonte(i)   = fq_fonte/dtime
233          snow(i)      = MAX(0., snow(i) - fq_fonte)
234          bil_eau_s(i) = bil_eau_s(i) + fq_fonte
235          tsurf_new(i) = tsurf_new(i) - fq_fonte * chasno 
236
237!IM cf JLD OK     
238!IM cf JLD/ GKtest fonte aussi pour la glace
239          IF (nisurf == is_sic .OR. nisurf == is_lic ) THEN
240             fq_fonte = MAX((tsurf_new(i)-RTT )/chaice,0.0)
241             ffonte(i) = ffonte(i) + fq_fonte * RLMLT/dtime
242             IF ( ok_lic_melt ) THEN
243                fqfonte(i) = fqfonte(i) + fq_fonte/dtime
244                bil_eau_s(i) = bil_eau_s(i) + fq_fonte
245             ENDIF
246             tsurf_new(i) = RTT
247          ENDIF
248          d_ts(i) = tsurf_new(i) - tsurf(i)
249       ENDIF
250
251       ! s'il y a une hauteur trop importante de neige, elle s'coule
252       fqcalving(i) = MAX(0., snow(i) - snow_max)/dtime
253       snow(i)=MIN(snow(i),snow_max)
254    END DO
255
256
257    IF (nisurf == is_ter) THEN
258       DO i = 1, knon
259          qsol(i) = qsol(i) + bil_eau_s(i)
260          run_off_ter(i) = run_off_ter(i) + MAX(qsol(i) - max_eau_sol, 0.0)
261          qsol(i) = MIN(qsol(i), max_eau_sol)
262       END DO
263    ELSE IF (nisurf == is_lic) THEN
264       DO i = 1, knon
265          j = knindex(i)
266          run_off_lic(i)   = (coeff_rel *  fqcalving(i)) + &
267               (1. - coeff_rel) * run_off_lic_0(j)
268          run_off_lic_0(j) = run_off_lic(i)
269          run_off_lic(i)   = run_off_lic(i) + fqfonte(i)/dtime
270       END DO
271    ENDIF
272   
273!****************************************************************************************
274! Save ffonte, fqfonte and fqcalving in global arrays for each
275! sub-surface separately
276!
277!****************************************************************************************
278    DO i = 1, knon
279       ffonte_global(knindex(i),nisurf)    = ffonte(i)
280       fqfonte_global(knindex(i),nisurf)   = fqfonte(i)
281       fqcalving_global(knindex(i),nisurf) = fqcalving(i)
282    ENDDO
283
284  END SUBROUTINE fonte_neige
285!
286!****************************************************************************************
287!
288  SUBROUTINE fonte_neige_final(restart_runoff)
289!
290! This subroutine returns run_off_lic_0 for later writing to restart file.
291!
292!****************************************************************************************
293    REAL, DIMENSION(klon), INTENT(OUT) :: restart_runoff
294
295!****************************************************************************************
296! Set the output variables
297    restart_runoff(:) = run_off_lic_0(:)
298
299! Deallocation of all varaibles in the module
300    DEALLOCATE(run_off_lic_0, run_off_ter, run_off_lic, ffonte_global, &
301         fqfonte_global, fqcalving_global)
302
303  END SUBROUTINE fonte_neige_final
304!
305!****************************************************************************************
306!
307  SUBROUTINE fonte_neige_get_vars(pctsrf, fqcalving_out, &
308       fqfonte_out, ffonte_out)
309
310! Cumulate ffonte, fqfonte and fqcalving respectively for
311! all type of surfaces according to their fraction.
312!
313! This routine is called from physiq.F before histwrite.
314
[793]315    INCLUDE "indicesol.h"
[782]316!****************************************************************************************
317    REAL, DIMENSION(klon,nbsrf), INTENT(IN) :: pctsrf
318
319    REAL, DIMENSION(klon), INTENT(OUT)      :: fqcalving_out
320    REAL, DIMENSION(klon), INTENT(OUT)      :: fqfonte_out
321    REAL, DIMENSION(klon), INTENT(OUT)      :: ffonte_out
322
323    INTEGER   :: nisurf
324!****************************************************************************************
325
326    ffonte_out(:)    = 0.0
327    fqfonte_out(:)   = 0.0
328    fqcalving_out(:) = 0.0
329
330    DO nisurf = 1, nbsrf
331       ffonte_out(:) = ffonte_out(:) + ffonte_global(:,nisurf)*pctsrf(:,nisurf)
332       fqfonte_out(:) = fqfonte_out(:) + fqfonte_global(:,nisurf)*pctsrf(:,nisurf)
333       fqcalving_out(:) = fqcalving_out(:) + fqcalving_global(:,nisurf)*pctsrf(:,nisurf)
334    ENDDO
335
336  END SUBROUTINE fonte_neige_get_vars
337!
338!****************************************************************************************
339!
340END MODULE fonte_neige_mod
341
342
343
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