41 |
C hi :: ice height |
C hi :: ice height |
42 |
C hs :: snow height |
C hs :: snow height |
43 |
C Tsf :: surface (ice or snow) temperature |
C Tsf :: surface (ice or snow) temperature |
44 |
C qicen :: ice enthalpy (J m-3) |
C qicen :: ice enthalpy (J/kg) |
45 |
C qleft :: net heat flux to ocean [W/m2] (> 0 downward) |
C qleft :: net heat flux to ocean [W/m2] (> 0 downward) |
46 |
C fresh :: Total fresh water flux to ocean [kg/m2/s] (> 0 downward) |
C fresh :: Total fresh water flux to ocean [kg/m2/s] (> 0 downward) |
47 |
C fsalt :: salt flux to ocean [g/m2/s] (> 0 downward) |
C fsalt :: salt flux to ocean [g/m2/s] (> 0 downward) |
103 |
_RL dhs ! change in snow thickness |
_RL dhs ! change in snow thickness |
104 |
_RL rq ! rho * q for a layer |
_RL rq ! rho * q for a layer |
105 |
_RL rqh ! rho * q * h for a layer |
_RL rqh ! rho * q * h for a layer |
106 |
_RL qbot ! q for new ice at bottom surf (J m-3) |
_RL qbot ! enthalpy for new ice at bottom surf (J/kg) |
107 |
_RL dt ! timestep |
_RL dt ! timestep |
108 |
_RL esurp ! surplus energy from melting (J m-2) |
_RL esurp ! surplus energy from melting (J m-2) |
109 |
_RL mwater0 ! fresh water mass gained/lost (kg/m^2) |
_RL mwater0 ! fresh water mass gained/lost (kg/m^2) |
134 |
C.. Compute growth and/or melting at the top and bottom surfaces....... |
C.. Compute growth and/or melting at the top and bottom surfaces....... |
135 |
C...................................................................... |
C...................................................................... |
136 |
|
|
137 |
if (frzmlt.ge. 0. _d 0) then |
IF (frzmlt.GE. 0. _d 0) THEN |
138 |
C !----------------------------------------------------------------- |
C !----------------------------------------------------------------- |
139 |
C ! freezing conditions |
C ! freezing conditions |
140 |
C !----------------------------------------------------------------- |
C !----------------------------------------------------------------- |
141 |
C if higher than hihig, use all frzmlt energy to grow extra ice |
C if higher than hihig, use all frzmlt energy to grow extra ice |
142 |
if (hi.gt.hihig.and. compact.le.iceMaskmax) then |
IF (hi.GT.hihig .AND. compact.LE.iceMaskmax) THEN |
143 |
Fbot=0. _d 0 |
Fbot=0. _d 0 |
144 |
else |
ELSE |
145 |
Fbot=frzmlt |
Fbot=frzmlt |
146 |
endif |
ENDIF |
147 |
else |
ELSE |
148 |
C !----------------------------------------------------------------- |
C !----------------------------------------------------------------- |
149 |
C ! melting conditions |
C ! melting conditions |
150 |
C !----------------------------------------------------------------- |
C !----------------------------------------------------------------- |
151 |
ustar = 5. _d -2 !for no currents |
ustar = 5. _d -2 !for no currents |
152 |
C frictional velocity between ice and water |
C frictional velocity between ice and water |
153 |
ustar = sqrt(0.00536 _d 0*oceV2s) |
ustar = SQRT(0.00536 _d 0*oceV2s) |
154 |
ustar=max(5. _d -3,ustar) |
ustar=max(5. _d -3,ustar) |
155 |
cpchr =cpwater*rhosw*transcoef |
cpchr =cpwater*rhosw*transcoef |
156 |
Fbot = cpchr*(Tf-oceTs)*ustar ! < 0 |
Fbot = cpchr*(Tf-oceTs)*ustar ! < 0 |
157 |
Fbot = max(Fbot,frzmlt) ! frzmlt < Fbot < 0 |
Fbot = max(Fbot,frzmlt) ! frzmlt < Fbot < 0 |
158 |
Fbot = min(Fbot,0. _d 0) |
Fbot = min(Fbot,0. _d 0) |
159 |
endif |
ENDIF |
160 |
|
|
161 |
C mass of fresh water and salt initially present in ice |
C mass of fresh water and salt initially present in ice |
162 |
mwater0 = rhos*hs + rhoi*hi |
mwater0 = rhos*hs + rhoi*hi |
169 |
|
|
170 |
C Compute energy available for melting/growth. |
C Compute energy available for melting/growth. |
171 |
|
|
172 |
if (hi.lt.himin0) then |
IF (hi.LT.himin0) THEN |
173 |
C below a certain height, all energy goes to changing ice extent |
C below a certain height, all energy goes to changing ice extent |
174 |
frace=1. _d 0 |
frace=1. _d 0 |
175 |
else |
ELSE |
176 |
frace=frac_energy |
frace=frac_energy |
177 |
endif |
ENDIF |
178 |
if (hi.gt.hihig) then |
IF (hi.GT.hihig) THEN |
179 |
C above certain height only melt from top |
C above certain height only melt from top |
180 |
frace=0. _d 0 |
frace=0. _d 0 |
181 |
else |
ELSE |
182 |
frace=frac_energy |
frace=frac_energy |
183 |
endif |
ENDIF |
184 |
C force this when no ice fractionation |
C force this when no ice fractionation |
185 |
if (frac_energy.eq.0. _d 0) frace=0. _d 0 |
IF (frac_energy.EQ.0. _d 0) frace=0. _d 0 |
186 |
|
|
187 |
c if (Tsf .eq. 0. _d 0 .and. sHeating.gt.0. _d 0) then |
c IF (Tsf .EQ. 0. _d 0 .AND. sHeating.GT.0. _d 0) THEN |
188 |
if ( sHeating.gt.0. _d 0 ) then |
IF ( sHeating.GT.0. _d 0 ) THEN |
189 |
etop = (1. _d 0-frace)*sHeating * dt |
etop = (1. _d 0-frace)*sHeating * dt |
190 |
etope = frace*sHeating * dt |
etope = frace*sHeating * dt |
191 |
else |
ELSE |
192 |
etop = 0. _d 0 |
etop = 0. _d 0 |
193 |
etope = 0. _d 0 |
etope = 0. _d 0 |
194 |
C jmc: found few cases where Tsf=0 & sHeating < 0 : add this line to conserv energy: |
C jmc: found few cases where Tsf=0 & sHeating < 0 : add this line to conserv energy: |
195 |
esurp = sHeating * dt |
esurp = sHeating * dt |
196 |
endif |
ENDIF |
197 |
C-- flux at the base of sea-ice: |
C-- flux at the base of sea-ice: |
198 |
C conduction H.flx= flxCnB (+ =down); oceanic turbulent H.flx= Fbot (+ =down). |
C conduction H.flx= flxCnB (+ =down); oceanic turbulent H.flx= Fbot (+ =down). |
199 |
C- ==> energy available(+ => melt)= (flxCnB-Fbot)*dt |
C- ==> energy available(+ => melt)= (flxCnB-Fbot)*dt |
200 |
c if (frzmlt.lt.0. _d 0) then |
c IF (frzmlt.LT.0. _d 0) THEN |
201 |
c ebot = (1. _d 0-frace)*(flxCnB-Fbot) * dt |
c ebot = (1. _d 0-frace)*(flxCnB-Fbot) * dt |
202 |
c ebote = frace*(flxCnB-Fbot) * dt |
c ebote = frace*(flxCnB-Fbot) * dt |
203 |
c else |
c ELSE |
204 |
c ebot = (flxCnB-Fbot) * dt |
c ebot = (flxCnB-Fbot) * dt |
205 |
c ebote = 0. _d 0 |
c ebote = 0. _d 0 |
206 |
c endif |
c ENDIF |
207 |
C- original formulation(above): Loose energy when flxCnB < Fbot < 0 |
C- original formulation(above): Loose energy when flxCnB < Fbot < 0 |
208 |
ebot = (flxCnB-Fbot) * dt |
ebot = (flxCnB-Fbot) * dt |
209 |
if (ebot.gt.0. _d 0) then |
IF (ebot.GT.0. _d 0) THEN |
210 |
ebote = frace*ebot |
ebote = frace*ebot |
211 |
ebot = ebot-ebote |
ebot = ebot-ebote |
212 |
else |
ELSE |
213 |
ebote = 0. _d 0 |
ebote = 0. _d 0 |
214 |
endif |
ENDIF |
215 |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: etop,etope,ebot,ebote=', |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: etop,etope,ebot,ebote=', |
216 |
& etop,etope,ebot,ebote |
& etop,etope,ebot,ebote |
217 |
|
|
221 |
C for reasonable values of i0.) |
C for reasonable values of i0.) |
222 |
|
|
223 |
hlyr = hi / rnlyr |
hlyr = hi / rnlyr |
224 |
do k = 1, nlyr |
DO k = 1, nlyr |
225 |
hnew(k) = hlyr |
hnew(k) = hlyr |
226 |
enddo |
ENDDO |
227 |
|
|
228 |
C Top melt: snow, then ice. |
C Top melt: snow, then ice. |
229 |
|
|
230 |
if (etop .gt. 0. _d 0) then |
IF (etop .GT. 0. _d 0) THEN |
231 |
if (hs. gt. 0. _d 0) then |
IF (hs. gt. 0. _d 0) THEN |
232 |
rq = rhos * qsnow |
rq = rhos * qsnow |
233 |
rqh = rq * hs |
rqh = rq * hs |
234 |
if (etop .lt. rqh) then |
IF (etop .LT. rqh) THEN |
235 |
hs = hs - etop/rq |
hs = hs - etop/rq |
236 |
etop = 0. _d 0 |
etop = 0. _d 0 |
237 |
else |
ELSE |
238 |
etop = etop - rqh |
etop = etop - rqh |
239 |
hs = 0. _d 0 |
hs = 0. _d 0 |
240 |
endif |
ENDIF |
241 |
endif |
ENDIF |
242 |
|
|
243 |
do k = 1, nlyr |
DO k = 1, nlyr |
244 |
if (etop .gt. 0. _d 0) then |
IF (etop .GT. 0. _d 0) THEN |
245 |
rq = rhoi * qicen(k) |
rq = rhoi * qicen(k) |
246 |
rqh = rq * hnew(k) |
rqh = rq * hnew(k) |
247 |
if (etop .lt. rqh) then |
IF (etop .LT. rqh) THEN |
248 |
hnew(k) = hnew(k) - etop / rq |
hnew(k) = hnew(k) - etop / rq |
249 |
etop = 0. _d 0 |
etop = 0. _d 0 |
250 |
else |
ELSE |
251 |
etop = etop - rqh |
etop = etop - rqh |
252 |
hnew(k) = 0. _d 0 |
hnew(k) = 0. _d 0 |
253 |
endif |
ENDIF |
254 |
endif |
ENDIF |
255 |
enddo |
ENDDO |
256 |
else |
ELSE |
257 |
etop=0. _d 0 |
etop=0. _d 0 |
258 |
endif |
ENDIF |
259 |
C If ice is gone and melting energy remains |
C If ice is gone and melting energy remains |
260 |
c if (etop .gt. 0. _d 0) then |
c IF (etop .GT. 0. _d 0) THEN |
261 |
c write (6,*) 'QQ All ice melts from top ', i,j |
c WRITE (6,*) 'QQ All ice melts from top ', i,j |
262 |
c hi=0. _d 0 |
c hi=0. _d 0 |
263 |
c go to 200 |
c go to 200 |
264 |
c endif |
c ENDIF |
265 |
|
|
266 |
|
|
267 |
C Bottom melt/growth. |
C Bottom melt/growth. |
268 |
|
|
269 |
if (ebot .lt. 0. _d 0) then |
IF (ebot .LT. 0. _d 0) THEN |
270 |
C Compute enthalpy of new ice growing at bottom surface. |
C Compute enthalpy of new ice growing at bottom surface. |
271 |
qbot = -cpice *Tf + Lfresh |
qbot = -cpice *Tf + Lfresh |
272 |
dhi = -ebot / (qbot * rhoi) |
dhi = -ebot / (qbot * rhoi) |
274 |
k = nlyr |
k = nlyr |
275 |
qicen(k) = (hnew(k)*qicen(k)+dhi*qbot) / (hnew(k)+dhi) |
qicen(k) = (hnew(k)*qicen(k)+dhi*qbot) / (hnew(k)+dhi) |
276 |
hnew(k) = hnew(k) + dhi |
hnew(k) = hnew(k) + dhi |
277 |
else |
ELSE |
278 |
do k = nlyr, 1, -1 |
DO k = nlyr, 1, -1 |
279 |
if (ebot.gt.0. _d 0 .and. hnew(k).gt.0. _d 0) then |
IF (ebot.GT.0. _d 0 .AND. hnew(k).GT.0. _d 0) THEN |
280 |
rq = rhoi * qicen(k) |
rq = rhoi * qicen(k) |
281 |
rqh = rq * hnew(k) |
rqh = rq * hnew(k) |
282 |
if (ebot .lt. rqh) then |
IF (ebot .LT. rqh) THEN |
283 |
hnew(k) = hnew(k) - ebot / rq |
hnew(k) = hnew(k) - ebot / rq |
284 |
ebot = 0. _d 0 |
ebot = 0. _d 0 |
285 |
else |
ELSE |
286 |
ebot = ebot - rqh |
ebot = ebot - rqh |
287 |
hnew(k) = 0. _d 0 |
hnew(k) = 0. _d 0 |
288 |
endif |
ENDIF |
289 |
endif |
ENDIF |
290 |
enddo |
ENDDO |
291 |
|
|
292 |
C If ice melts completely and snow is left, remove the snow with |
C If ice melts completely and snow is left, remove the snow with |
293 |
C energy from the mixed layer |
C energy from the mixed layer |
294 |
|
|
295 |
if (ebot.gt.0. _d 0 .and. hs.gt.0. _d 0) then |
IF (ebot.GT.0. _d 0 .AND. hs.GT.0. _d 0) THEN |
296 |
rq = rhos * qsnow |
rq = rhos * qsnow |
297 |
rqh = rq * hs |
rqh = rq * hs |
298 |
if (ebot .lt. rqh) then |
IF (ebot .LT. rqh) THEN |
299 |
hs = hs - ebot / rq |
hs = hs - ebot / rq |
300 |
ebot = 0. _d 0 |
ebot = 0. _d 0 |
301 |
else |
ELSE |
302 |
ebot = ebot - rqh |
ebot = ebot - rqh |
303 |
hs = 0. _d 0 |
hs = 0. _d 0 |
304 |
endif |
ENDIF |
305 |
endif |
ENDIF |
306 |
c if (ebot .gt. 0. _d 0) then |
c IF (ebot .GT. 0. _d 0) THEN |
307 |
c IF (dBug) WRITE(6,*) 'All ice (& snow) melts from bottom' |
c IF (dBug) WRITE(6,*) 'All ice (& snow) melts from bottom' |
308 |
c hi=0. _d 0 |
c hi=0. _d 0 |
309 |
c go to 200 |
c go to 200 |
310 |
c endif |
c ENDIF |
311 |
endif |
ENDIF |
312 |
|
|
313 |
C Compute new total ice thickness. |
C Compute new total ice thickness. |
314 |
hi = 0. _d 0 |
hi = 0. _d 0 |
315 |
do k = 1, nlyr |
DO k = 1, nlyr |
316 |
hi = hi + hnew(k) |
hi = hi + hnew(k) |
317 |
enddo |
ENDDO |
318 |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: etop, ebot, hi, hs =', |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: etop, ebot, hi, hs =', |
319 |
& etop, ebot, hi, hs |
& etop, ebot, hi, hs |
320 |
|
|
321 |
C If hi < himin, melt the ice. |
C If hi < himin, melt the ice. |
322 |
if ( hi.lt.himin .AND. (hi+hs).gt.0. _d 0 ) then |
IF ( hi.LT.himin .AND. (hi+hs).GT.0. _d 0 ) THEN |
323 |
esurp = esurp - rhos*qsnow*hs |
esurp = esurp - rhos*qsnow*hs |
324 |
do k = 1, nlyr |
DO k = 1, nlyr |
325 |
esurp = esurp - rhoi*qicen(k)*hnew(k) |
esurp = esurp - rhoi*qicen(k)*hnew(k) |
326 |
enddo |
ENDDO |
327 |
hi = 0. _d 0 |
hi = 0. _d 0 |
328 |
hs = 0. _d 0 |
hs = 0. _d 0 |
329 |
Tsf=0. _d 0 |
Tsf=0. _d 0 |
330 |
compact = 0. _d 0 |
compact = 0. _d 0 |
331 |
do k = 1, nlyr |
DO k = 1, nlyr |
332 |
qicen(k) = 0. _d 0 |
qicen(k) = 0. _d 0 |
333 |
enddo |
ENDDO |
334 |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: -1 : esurp=',esurp |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: -1 : esurp=',esurp |
335 |
endif |
ENDIF |
336 |
|
|
337 |
C-- do a mass-budget of sea-ice to compute "fresh" = the fresh-water flux |
C-- do a mass-budget of sea-ice to compute "fresh" = the fresh-water flux |
338 |
C that is returned to the ocean ; needs to be done before snow/evap |
C that is returned to the ocean ; needs to be done before snow/evap |
340 |
|
|
341 |
C- note : was not supposed to modify snowPr in THSICE_CALC_TH ; |
C- note : was not supposed to modify snowPr in THSICE_CALC_TH ; |
342 |
C but to reproduce old results, reset to zero if Tsf >= 0 |
C but to reproduce old results, reset to zero if Tsf >= 0 |
343 |
c IF ( Tsf.ge.0. _d 0 ) snowPr = 0. |
c IF ( Tsf.GE.0. _d 0 ) snowPr = 0. |
344 |
|
|
345 |
IF ( hi .LE. 0. _d 0 ) THEN |
IF ( hi .LE. 0. _d 0 ) THEN |
346 |
C- return snow to the ocean (account for Latent heat of freezing) |
C- return snow to the ocean (account for Latent heat of freezing) |
347 |
fresh = fresh + snowPr |
fresh = fresh + snowPr |
348 |
qleft = qleft - snowPr*Lfresh |
qleft = qleft - snowPr*Lfresh |
349 |
GOTO 200 |
|
350 |
ENDIF |
ELSE |
351 |
|
C- else: hi > 0 |
352 |
|
|
353 |
C Let it snow |
C Let it snow |
354 |
|
|
356 |
|
|
357 |
C If ice evap is used to sublimate surface snow/ice or |
C If ice evap is used to sublimate surface snow/ice or |
358 |
C if no ice pass on to ocean |
C if no ice pass on to ocean |
359 |
if (hs.gt.0. _d 0) then |
IF (hs.GT.0. _d 0) THEN |
360 |
if (evap/rhos *dt.gt.hs) then |
IF (evap/rhos *dt.GT.hs) THEN |
361 |
evap=evap-hs*rhos/dt |
evap=evap-hs*rhos/dt |
362 |
hs=0. _d 0 |
hs=0. _d 0 |
363 |
else |
ELSE |
364 |
hs = hs - evap/rhos *dt |
hs = hs - evap/rhos *dt |
365 |
evap=0. _d 0 |
evap=0. _d 0 |
366 |
endif |
ENDIF |
367 |
endif |
ENDIF |
368 |
if (hi.gt.0. _d 0.and.evap.gt.0. _d 0) then |
IF (hi.GT.0. _d 0.AND.evap.GT.0. _d 0) THEN |
369 |
do k = 1, nlyr |
DO k = 1, nlyr |
370 |
if (evap .gt. 0. _d 0) then |
IF (evap .GT. 0. _d 0) THEN |
371 |
C-- original scheme, does not care about ice temp. |
C-- original scheme, does not care about ice temp. |
372 |
C- this can produce small error (< 1.W/m2) in the Energy budget |
C- this can produce small error (< 1.W/m2) in the Energy budget |
373 |
c if (evap/rhoi *dt.gt.hnew(k)) then |
c IF (evap/rhoi *dt.GT.hnew(k)) THEN |
374 |
c evap=evap-hnew(k)*rhoi/dt |
c evap=evap-hnew(k)*rhoi/dt |
375 |
c hnew(k)=0. _d 0 |
c hnew(k)=0. _d 0 |
376 |
c else |
c ELSE |
377 |
c hnew(k) = hnew(k) - evap/rhoi *dt |
c hnew(k) = hnew(k) - evap/rhoi *dt |
378 |
c evap=0. _d 0 |
c evap=0. _d 0 |
379 |
c endif |
c ENDIF |
380 |
C-- modified scheme. taking into account Ice enthalpy |
C-- modified scheme. taking into account Ice enthalpy |
381 |
dhi = evap/rhoi*dt |
dhi = evap/rhoi*dt |
382 |
if (dhi.ge.hnew(k)) then |
IF (dhi.GE.hnew(k)) THEN |
383 |
evap=evap-hnew(k)*rhoi/dt |
evap=evap-hnew(k)*rhoi/dt |
384 |
esurp = esurp - hnew(k)*rhoi*(qicen(k)-Lfresh) |
esurp = esurp - hnew(k)*rhoi*(qicen(k)-Lfresh) |
385 |
hnew(k)=0. _d 0 |
hnew(k)=0. _d 0 |
386 |
else |
ELSE |
387 |
hq = hnew(k)*qicen(k)-dhi*Lfresh |
hq = hnew(k)*qicen(k)-dhi*Lfresh |
388 |
hnew(k) = hnew(k) - dhi |
hnew(k) = hnew(k) - dhi |
389 |
qicen(k)=hq/hnew(k) |
qicen(k)=hq/hnew(k) |
390 |
evap=0. _d 0 |
evap=0. _d 0 |
391 |
endif |
ENDIF |
392 |
C------- |
C------- |
393 |
endif |
ENDIF |
394 |
enddo |
ENDDO |
395 |
endif |
ENDIF |
396 |
c if (evap .gt. 0. _d 0) then |
c IF (evap .GT. 0. _d 0) THEN |
397 |
c write (6,*) 'BB All ice sublimates', i,j |
c WRITE (6,*) 'BB All ice sublimates', i,j |
398 |
c hi=0. _d 0 |
c hi=0. _d 0 |
399 |
c go to 200 |
c go to 200 |
400 |
c endif |
c ENDIF |
401 |
|
|
402 |
C Compute new total ice thickness. |
C Compute new total ice thickness. |
403 |
|
|
404 |
hi = 0. _d 0 |
hi = 0. _d 0 |
405 |
do k = 1, nlyr |
DO k = 1, nlyr |
406 |
hi = hi + hnew(k) |
hi = hi + hnew(k) |
407 |
enddo |
ENDDO |
408 |
|
|
409 |
C If hi < himin, melt the ice. |
C If hi < himin, melt the ice. |
410 |
if ( hi.gt.0. _d 0 .AND. hi.lt.himin ) then |
IF ( hi.GT.0. _d 0 .AND. hi.LT.himin ) THEN |
411 |
fresh = fresh + (rhos*hs + rhoi*hi)/dt |
fresh = fresh + (rhos*hs + rhoi*hi)/dt |
412 |
esurp = esurp - rhos*qsnow*hs |
esurp = esurp - rhos*qsnow*hs |
413 |
do k = 1, nlyr |
DO k = 1, nlyr |
414 |
esurp = esurp - rhoi*qicen(k)*hnew(k) |
esurp = esurp - rhoi*qicen(k)*hnew(k) |
415 |
enddo |
ENDDO |
416 |
hi = 0. _d 0 |
hi = 0. _d 0 |
417 |
hs = 0. _d 0 |
hs = 0. _d 0 |
418 |
Tsf=0. _d 0 |
Tsf=0. _d 0 |
419 |
compact = 0. _d 0 |
compact = 0. _d 0 |
420 |
do k = 1, nlyr |
DO k = 1, nlyr |
421 |
qicen(k) = 0. _d 0 |
qicen(k) = 0. _d 0 |
422 |
enddo |
ENDDO |
423 |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: -2 : esurp,fresh=', |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: -2 : esurp,fresh=', |
424 |
& esurp, fresh |
& esurp, fresh |
425 |
endif |
ENDIF |
426 |
IF ( hi .le. 0. _d 0 ) GOTO 200 |
|
427 |
|
C- else hi > 0: end |
428 |
|
ENDIF |
429 |
|
|
430 |
|
IF ( hi .GT. 0. _d 0 ) THEN |
431 |
|
|
432 |
C If there is enough snow to lower the ice/snow interface below |
C If there is enough snow to lower the ice/snow interface below |
433 |
C freeboard, convert enough snow to ice to bring the interface back |
C freeboard, convert enough snow to ice to bring the interface back |
434 |
C to sea-level. Adjust enthalpy of top ice layer accordingly. |
C to sea-level. Adjust enthalpy of top ice layer accordingly. |
435 |
|
|
436 |
if ( hs .gt. hi*rhoiw/rhos ) then |
IF ( hs .GT. hi*rhoiw/rhos ) THEN |
437 |
cBB write (6,*) 'Freeboard adjusts' |
cBB WRITE (6,*) 'Freeboard adjusts' |
438 |
dhi = (hs * rhos - hi * rhoiw) / rhosw |
dhi = (hs * rhos - hi * rhoiw) / rhosw |
439 |
dhs = dhi * rhoi / rhos |
dhs = dhi * rhoi / rhos |
440 |
rqh = rhoi*qicen(1)*hnew(1) + rhos*qsnow*dhs |
rqh = rhoi*qicen(1)*hnew(1) + rhos*qsnow*dhs |
442 |
qicen(1) = rqh / (rhoi*hnew(1)) |
qicen(1) = rqh / (rhoi*hnew(1)) |
443 |
hi = hi + dhi |
hi = hi + dhi |
444 |
hs = hs - dhs |
hs = hs - dhs |
445 |
end if |
ENDIF |
446 |
|
|
447 |
|
|
448 |
C limit ice height |
C limit ice height |
449 |
C- NOTE: this part does not conserve Energy ; |
C- NOTE: this part does not conserve Energy ; |
450 |
C but surplus of fresh water and salt are taken into account. |
C but surplus of fresh water and salt are taken into account. |
451 |
if (hi.gt.hiMax) then |
IF (hi.GT.hiMax) THEN |
452 |
cBB print*,'BBerr, hi>hiMax',i,j,hi |
cBB print*,'BBerr, hi>hiMax',i,j,hi |
453 |
chi=hi-hiMax |
chi=hi-hiMax |
454 |
do k=1,nlyr |
DO k=1,nlyr |
455 |
hnew(k)=hnew(k)-chi/2. _d 0 |
hnew(k)=hnew(k)-chi/2. _d 0 |
456 |
enddo |
ENDDO |
457 |
fresh = fresh + chi*rhoi/dt |
fresh = fresh + chi*rhoi/dt |
458 |
endif |
ENDIF |
459 |
if (hs.gt.hsMax) then |
IF (hs.GT.hsMax) THEN |
460 |
c print*,'BBerr, hs>hsMax',i,j,hs |
c print*,'BBerr, hs>hsMax',i,j,hs |
461 |
chs=hs-hsMax |
chs=hs-hsMax |
462 |
hs=hsMax |
hs=hsMax |
463 |
fresh = fresh + chs*rhos/dt |
fresh = fresh + chs*rhos/dt |
464 |
endif |
ENDIF |
465 |
|
|
466 |
C Compute new total ice thickness. |
C Compute new total ice thickness. |
467 |
|
|
468 |
hi = 0. _d 0 |
hi = 0. _d 0 |
469 |
do k = 1, nlyr |
DO k = 1, nlyr |
470 |
hi = hi + hnew(k) |
hi = hi + hnew(k) |
471 |
enddo |
ENDDO |
472 |
|
|
473 |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: b-Winton: hnew, qice =', |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: b-Winton: hnew, qice =', |
474 |
& hnew, qicen |
& hnew, qicen |
475 |
|
|
476 |
hlyr = hi/rnlyr |
hlyr = hi/rnlyr |
477 |
CALL THSICE_RESHAPE_LAYERS( |
CALL THSICE_RESHAPE_LAYERS( |
478 |
U qicen, |
U qicen, |
479 |
I hlyr, hnew, myThid ) |
I hlyr, hnew, myThid ) |
480 |
|
|
481 |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: compact,hi, qtot, hs =', |
IF (dBug) WRITE(6,1020) 'ThSI_CALC_TH: compact,hi, qtot, hs =', |
482 |
& compact,hi,(qicen(1)+qicen(2))*0.5, hs |
& compact,hi,(qicen(1)+qicen(2))*0.5, hs |
483 |
|
|
484 |
200 continue |
C- if hi > 0 : end |
485 |
|
ENDIF |
486 |
|
200 CONTINUE |
487 |
|
|
488 |
C- Compute surplus energy left over from melting. |
C- Compute surplus energy left over from melting. |
489 |
|
|
490 |
if (hi.le.0. _d 0) compact=0. _d 0 |
IF (hi.LE.0. _d 0) compact=0. _d 0 |
491 |
|
|
492 |
C.. heat fluxes left over for ocean |
C.. heat fluxes left over for ocean |
493 |
qleft = qleft + (Fbot+(esurp+etop+ebot)/dt) |
qleft = qleft + (Fbot+(esurp+etop+ebot)/dt) |
522 |
|
|
523 |
C calculate extent changes |
C calculate extent changes |
524 |
extend=etope+ebote |
extend=etope+ebote |
525 |
if (compact.gt.0. _d 0.and.extend.gt.0. _d 0) then |
IF (compact.GT.0. _d 0.AND.extend.GT.0. _d 0) THEN |
526 |
rq = rhoi * 0.5 _d 0*(qicen(1)+qicen(2)) |
rq = rhoi * 0.5 _d 0*(qicen(1)+qicen(2)) |
527 |
rs = rhos * qsnow |
rs = rhos * qsnow |
528 |
rqh = rq * hi + rs * hs |
rqh = rq * hi + rs * hs |
529 |
freshe=(rhos*hs+rhoi*hi)/dt |
freshe=(rhos*hs+rhoi*hi)/dt |
530 |
salte=(rhoi*hi*saltice)/dt |
salte=(rhoi*hi*saltice)/dt |
531 |
if (extend .lt. rqh) then |
IF (extend .LT. rqh) THEN |
532 |
compact=(1. _d 0-extend/rqh)*compact |
compact=(1. _d 0-extend/rqh)*compact |
533 |
fresh=fresh+extend/rqh*freshe |
fresh=fresh+extend/rqh*freshe |
534 |
fsalt=fsalt+extend/rqh*salte |
fsalt=fsalt+extend/rqh*salte |
535 |
else |
ELSE |
536 |
compact=0. _d 0 |
compact=0. _d 0 |
537 |
hi=0. _d 0 |
hi=0. _d 0 |
538 |
hs=0. _d 0 |
hs=0. _d 0 |
539 |
qleft=qleft+(extend-rqh)/dt |
qleft=qleft+(extend-rqh)/dt |
540 |
fresh=fresh+freshe |
fresh=fresh+freshe |
541 |
fsalt=fsalt+salte |
fsalt=fsalt+salte |
542 |
endif |
ENDIF |
543 |
elseif (extend.gt.0. _d 0) then |
ELSEIF (extend.GT.0. _d 0) THEN |
544 |
qleft=qleft+extend/dt |
qleft=qleft+extend/dt |
545 |
endif |
ENDIF |
546 |
|
|
547 |
#endif /* ALLOW_THSICE */ |
#endif /* ALLOW_THSICE */ |
548 |
|
|