/[MITgcm]/MITgcm/pkg/fizhi/fizhi_lsm.F
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Revision 1.6 - (hide annotations) (download)
Thu Jun 16 16:46:12 2005 UTC (19 years ago) by ce107
Branch: MAIN
Changes since 1.5: +29 -29 lines 
Fix fizhi constants to _d 0 form as the IBM XL compiler complains on mixed
precision calls to intrinsics like max, min. Only problematic cases have
been altered - consider compiling with -qdpc=e to fix the precision of the
rest.
1 ce107 1.6 C $Header: /u/gcmpack/MITgcm/pkg/fizhi/fizhi_lsm.F,v 1.5 2004/07/30 18:59:32 molod Exp $
2 molod 1.2 C $Name: $
3    
4 molod 1.4 #include "FIZHI_OPTIONS.h"
5 molod 1.1 SUBROUTINE TILE (
6     I NCH, DTSTEP, ITYP, TRAINL,TRAINC, TSNOW, UM,
7     I ETURB, DEDQA, DEDTC, HSTURB, DHSDQA, DHSDTC,
8     I TM, QM, CD, SUNANG, PARDIR, PARDIF,
9     I SWNET, HLWDWN, PSUR, ZLAI, GREEN, Z2,
10     I SQSCAT, RSOIL1, RSOIL2, RDC, U2FAC,
11     I QSATTC, DQSDTC, ALWRAD, BLWRAD,
12     U TC, TD, QA, SWET1, SWET2, SWET3, CAPAC, SNOW,
13     O EVAP, SHFLUX, RUNOFF, BOMB,
14     O EINT, ESOI, EVEG, ESNO, SMELT, HLATN,
15     O HLWUP,GDRAIN,RUNSRF,FWSOIL,
16     O STRDG1, STRDG2, STRDG3, STRDG4,
17     O STRDG5, STRDG6, STRDG7, STRDG8, STRDG9
18     & )
19    
20     C SCCS VERSION @(#)lsm.f 1.2 11/3/92
21    
22     C****
23     C**** This subroutine computes the outgoing fluxes of sensible and
24     C**** latent heat from the land surface and updates the surface prognostic
25     C**** variables.
26     C****
27     IMPLICIT NONE
28     C
29     C****
30 molod 1.2 #include "sibber.h"
31 molod 1.1 C****
32     INTEGER NCH
33     INTEGER ITYP(NCH)
34 molod 1.4 _RL DTSTEP, TRAINL(NCH), TRAINC(NCH), TSNOW(NCH), UM(NCH),
35 molod 1.1 & ETURB(NCH), DEDQA(NCH), HSTURB(NCH), DHSDTC(NCH),
36     & TM (NCH), CD(NCH), SUNANG(NCH), DHSDQA(NCH),
37     & QM (NCH), PARDIR(NCH), PARDIF(NCH), SWNET(NCH),
38     & HLWDWN(NCH), PSUR(NCH), ZLAI(NCH), GREEN(NCH),
39     & Z2(NCH), SQSCAT(NCH), DEDTC(NCH)
40 molod 1.4 _RL RSOIL1(NCH), RSOIL2(NCH), RDC(NCH), U2FAC(NCH),
41 molod 1.1 & QSATTC(NCH), DQSDTC(NCH), ALWRAD(NCH), BLWRAD(NCH),
42     & TC(NCH), TD(NCH), QA(NCH), BOMB(NCH),
43     & SWET1(NCH), SWET2(NCH), SWET3(NCH), CAPAC(NCH),
44     & SNOW(NCH), EVAP(NCH), SHFLUX(NCH), RUNOFF(NCH)
45 molod 1.4 _RL EINT(NCH), ESOI(NCH), EVEG(NCH), ESNO(NCH),
46 molod 1.1 & STRDG1(NCH), STRDG2(NCH), STRDG3(NCH), STRDG4(NCH),
47     & STRDG5(NCH), STRDG6(NCH), STRDG7(NCH), STRDG8(NCH),
48     & STRDG9(NCH),
49     & SMELT(NCH), HLATN(NCH), HLWUP(NCH), GDRAIN(NCH),
50     & RUNSRF(NCH), FWSOIL(NCH)
51     C****
52     INTEGER ChNo
53 molod 1.4 _RL SWET(nch,NLAY), VGPSAT(NTYPS), VGCSAT (NTYPS),
54 molod 1.1 & VGZDEP(NLAY,NTYPS), VGSLOP(NTYPS), DELTC,
55     & DELEA, VGPH1(NTYPS), VGPH2(NTYPS),
56     & VGRPLN(NTYPS), CSOIL0(NTYPS), WSOI12,
57     & VGBEE(NTYPS), DELZ12(NTYPS),
58 molod 1.2 & DELZ23(NTYPS)
59 molod 1.1 C****
60    
61 molod 1.4 _RL PHLAY(nch,NLAY), AKLAY(nch,NLAY), SWET12(nch),
62 molod 1.1 & CSOIL(nch),
63     & RCUN(nch), VPDSTR(nch), ESATTX(nch),
64     & VPDSTX(nch), VGBEEX(nch)
65 molod 1.4 _RL EMAXRT(nch), VGWMAX(NLAY,NTYPS), FTEMP(nch),
66 molod 1.1 & PHR(nch), SOILCO(nch), RC(nch),
67     & EAX(nch), TX(nch), RCX(nch),
68     & DRCDTC(nch), SATCAP(nch), PAR(nch),
69     & PDIR(nch), DUMMY(nch)
70 molod 1.4 _RL FTEMPX(nch), DRCDEA(nch), VGPSAX(nch), VGCSAX(nch),
71 molod 1.1 & VGZDEX(NLAY,nch), VGSLOX(nch), VGPH1X(nch),
72     & VGPH2X(nch), VGRPLX(nch)
73 molod 1.4 _RL DEDEA(nch), DHSDEA(nch), EM(nch), ESATTC(nch),
74 molod 1.1 & DESDTC(nch), EA(nch), RA(nch), ALHX(nch),
75     & WETEQ1(nch), WETEQ2(nch),
76     & RX1(nch), RX2(nch), SNWFRC(nch), POTFRC(nch),
77     & ESNFRC(nch), EIRFRC(nch), FCAN(nch), EPFRC,
78     & DEFCIT, EADJST, RTBS
79 molod 1.4 _RL cmpbug
80 molod 1.1
81     C****
82     DATA VGWMAX /8.4, 621.6, 840.0,
83     2 8.4, 621.6, 840.0,
84     3 8.4, 621.6, 840.0,
85     4 8.4, 197.4, 420.0,
86     5 8.704, 204.5, 435.2,
87     6 8.4, 71.4, 420.0,
88     7 4.000, 4.000, 130.56,
89     8 4.000, 4.000, 130.56,
90     9 8.704, 73.984, 130.56,
91     1 4.000, 4.000, 130.56
92     & /
93     DATA VGBEE / 4., 4., 4., 4., 1.69, 4.,
94     & 4., 1.69, 1.69, 1.69/
95     C DATA VGBEE / 7., 7., 7., 7., 1.69, 7.,
96     C & 7., 1.69, 1.69, 1.69/
97     c DATA VGBEE / 4., 4., 4., 4., 0.95, 4.,
98     c & 4., 0.95, 0.95, 0.95/
99     C DATA VGBEE /7, 7, 7, 7, 2, 7, 7, 4, 2, 4/
100     DATA VGPSAT/ -0.281, -0.281, -0.281, -0.281,
101     5 -0.073, -0.281, -0.281, -0.073,
102     9 -0.073 , -0.073/
103     C DATA VGPSAT/ -0.086, -0.086, -0.086, -0.086,
104     C 5 -0.073, -0.086, -0.086, -0.073,
105     C 9 -0.073 , -0.073/
106     c DATA VGPSAT/ -0.281, -0.281, -0.281, -0.281,
107     c 5 -0.014, -0.281, -0.281, -0.014,
108     c 9 -0.014 , -0.014/
109     c DATA VGCSAT / 0.00002, 0.00002, 0.00002, 0.00002,
110     c 5 0.0000583, 0.00002, 0.00002, 0.0000583,
111     c 9 0.0000583, 0.0000583
112     c & /
113     DATA VGCSAT / 0.0000012, 0.0000012, 0.0000012, 0.0000012,
114     5 0.0000583, 0.0000012, 0.0000012, 0.0000583,
115     9 0.0000583, 0.0000583
116     & /
117     C**** - - - - - - - -
118     C**** THE FOLLOWING 3 VARIABLES MUST MAINTAIN CONSISTENT VALUES. ZDEP12(N) =
119     C**** (VGZDEP(1,N)+VGZDEP(2,N))/2. ; SIMILARLY FOR ZDEP23(N).
120     C****
121     DATA VGZDEP /.02, 1.48, 2.00,
122     2 .02, 1.48, 2.00,
123     3 .02, 1.48, 2.00,
124     4 .02, .47, 1.00,
125     5 .02, .47, 1.00,
126     6 .02, .17, 1.00,
127     7 .0092, .0092, .30,
128     8 .0092, .0092, .30,
129     9 .02, .17, .30,
130     1 .0092, .0092, .30
131     & /
132     DATA DELZ12 / 0.75, 0.75, 0.75, 0.245, 0.245, 0.095, 0.0092,
133     8 0.0092, 0.095, 0.0092 /
134     DATA DELZ23 / 1.74, 1.74, 1.74, 0.735, 0.735, 0.585, 0.155,
135     8 0.155, 0.235, 0.155 /
136     C**** - - - - - - - -
137     DATA VGSLOP / .1736, .1736, .1736, .1736,
138     5 1.000, .1736, .1736, 1.000,
139     & 1.000 , 1.000 /
140     c DATA VGSLOP / .1736, .1736, .1736, .1736,
141     c 5 .0872, .1736, .1736, .0872,
142     c & .0872 , .0872 /
143     c DATA VGSLOP / 1., 1., 1., 1., 1., 1., 1., 1., 1.,1./
144     DATA VGPH1 / -100., -190., -200., -120.,
145     5 -200., -200., -200., -10.,
146     9 -10., -10. /
147     DATA VGPH2 / -500., -250., -250., -230.,
148     5 -400., -400., -250., -100.,
149     9 -100., -100. /
150     DATA VGRPLN /0.245E+09, 0.245E+09, 0.245E+09, 0.250E+09,
151     5 0.250E+09, 0.250E+09, 0.245E+09, 0.1E+09,
152     9 0.1E+09, 0.100E+09 /
153     C****
154     DATA DELTC /0.01/, DELEA /0.001/
155    
156     c Note: SNWMID & CSOIL0 parameters modified from (Koster/Suarez)
157     c to obtain improved albedo, radswg, and annual/diurnal cycle (L.Takacs 2/17/00)
158     c ------------------------------------------------------------------------------------
159     DATA CSOIL0 /175000.,175000.,175000.,175000.,175000.,
160     . 175000.,175000.,120000.,175000., 70000./
161 molod 1.2 #include "snwmid.h"
162 molod 1.1
163     C****
164     C**** ---------------------------------------------------------------------
165     C****
166     CFPP$ EXPAND (TMPFAC, RCANOP, SOIL, WUPDAT, SMFAC)
167     C****
168     C**** Expand data as specified by ITYP into arrays of size NCH.
169     C****
170     DO 50 ChNo = 1, NCH
171     BOMB(CHNO) = 0.
172     VGBEEX(ChNo) = VGBEE(ITYP(ChNo))
173     VGPSAX(ChNo) = VGPSAT(ITYP(ChNo))
174     VGCSAX(ChNo) = VGCSAT(ITYP(ChNo))
175     VGZDEX(SFCLY ,ChNo) = VGZDEP(SFCLY ,ITYP(ChNo))
176     VGZDEX(ROOTLY,ChNo) = VGZDEP(ROOTLY,ITYP(ChNo))
177     VGZDEX(RECHLY,ChNo) = VGZDEP(RECHLY,ITYP(ChNo))
178     VGSLOX(ChNo) = VGSLOP(ITYP(ChNo))
179     VGPH1X(ChNo) = VGPH1(ITYP(ChNo))
180     VGPH2X(ChNo) = VGPH2(ITYP(ChNo))
181     VGRPLX(ChNo) = VGRPLN(ITYP(ChNo))
182     50 CONTINUE
183    
184     C****
185     C**** Pre-process input arrays as necessary:
186    
187     DO 100 ChNo = 1, NCH
188    
189 ce107 1.6 DEDQA(CHNO) = MAX( DEDQA(CHNO), 500. _d 0/ALHE )
190     DEDTC(CHNO) = MAX( DEDTC(CHNO), 0. _d 0)
191     DHSDQA(CHNO) = MAX( DHSDQA(CHNO), 0. _d 0)
192     DHSDTC(CHNO) = MAX( DHSDTC(CHNO), -10. _d 0)
193 molod 1.1
194     EM(CHNO) = QM(CHNO) * PSUR(CHNO) / EPSILON
195     EA(CHNO) = QA(CHNO) * PSUR(CHNO) / EPSILON
196     ESATTC(CHNO) = QSATTC(CHNO) * PSUR(CHNO) / EPSILON
197     DESDTC(CHNO) = DQSDTC(CHNO) * PSUR(CHNO) / EPSILON
198     C DEDEA(CHNO) = DEDQA(CHNO) * EPSILON / ( PSUR(CHNO) * ALHX(CHNO) )
199     DEDEA(CHNO) = DEDQA(CHNO) * EPSILON / PSUR(CHNO)
200     DHSDEA(CHNO) = DHSDQA(CHNO) * EPSILON / PSUR(CHNO)
201     C DEDTC(CHNO) = DEDTC(CHNO) / ALHX(CHNO)
202     C ETURB(CHNO) = ETURB(CHNO) / ALHX(CHNO)
203     PAR(CHNO) = (PARDIR(CHNO) + PARDIF(CHNO) + 1.E-20)
204     PDIR(CHNO) = PARDIR(CHNO) / PAR(CHNO)
205     RA(CHNO) = ONE / ( CD(CHNO) * UM(CHNO) )
206     SATCAP(ChNo) = 0.1 * ZLAI(ChNo)
207     CSOIL(CHNO) = CSOIL0(ITYP(ChNo))
208 ce107 1.6 SWET(ChNo,SFCLY ) = max( min(SWET1(ChNo),1. _d 0), 0. _d 0)
209     SWET(ChNo,ROOTLY) = max( min(SWET2(ChNo),1. _d 0), 0. _d 0)
210     SWET(ChNo,RECHLY) = max( min(SWET3(ChNo),1. _d 0), 0. _d 0)
211     CAPAC(CHNO) = max( min(CAPAC(ChNo),SATCAP(CHNO)), 0. _d 0)
212 molod 1.1 C****
213    
214     SNWFRC(CHNO) = SNOW(CHNO) / ( SNOW(CHNO) + SNWMID(ITYP(CHNO)) )
215 ce107 1.6 FCAN(CHNO) = MIN( 1. _d 0, MAX(0. _d 0,CAPAC(ChNo)/SATCAP(ChNo)) )
216 molod 1.1 POTFRC(CHNO)=1.-(1.-SNWFRC(CHNO))*(1.-FCAN(CHNO))
217    
218    
219     WSOI12=SWET(ChNo,SFCLY ) * VGWMAX(SFCLY ,ITYP(ChNo)) +
220     & SWET(ChNo,ROOTLY) * VGWMAX(ROOTLY,ITYP(ChNo))
221     SWET12(ChNo) = WSOI12 /
222     & (VGWMAX(SFCLY,ITYP(ChNo)) + VGWMAX(ROOTLY,ITYP(ChNo)))
223    
224     EMAXRT(CHNO) = ( SNOW(CHNO) + CAPAC(CHNO) + WSOI12 ) / DTSTEP
225    
226     C****
227     RUNOFF(CHNO) = 0.
228     RUNSRF(CHNO) = 0.
229     C**** (SMELT is zeroed in FLUXES)
230     C SMELT(CHNO) = 0.
231     FWSOIL(CHNO) = 0.
232     100 CONTINUE
233    
234     C****
235     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
236     C**** STEP 1: COMPUTE EFFECTIVE RESISTANCE RC FOR ENERGY BALANCE.
237     C**** (RCUNST computes the unstressed resistance,
238     C**** VPDFAC computes the vapor pressure deficit stress term,
239     C**** TMPFAC computes the temperature stress term,
240     C**** SOIL computes soil moisture potentials and conds.,
241     C**** SMFAC computes rc given a leaf water potential stress,
242     C**** RSURFP computes rc given a parallel resist. from the
243     C**** surface,
244     C**** RCANOP computes rc corrected for snow and interception.)
245     C****
246    
247     CALL RCUNST (
248     I NCH, ITYP, SUNANG, SQSCAT, PDIR,
249     I PAR, ZLAI, GREEN,
250     O RCUN
251     & )
252    
253     CALL VPDFAC (
254     I NCH, ITYP, ESATTC, EA,
255     O VPDSTR
256     & )
257    
258     CALL TMPFAC (
259     I NCH, ITYP, TC,
260     O FTEMP
261     & )
262    
263     CALL SOIL (
264     I NCH, ITYP, SWET12, VGBEEX, VGPSAX, VGCSAX, DELZ12,
265     O PHR, SOILCO, DUMMY
266     & )
267    
268     cmpbug=0.
269    
270     CALL SMFAC (
271     I NCH, ITYP, ESATTC, EA, PHR, SOILCO, RCUN,
272     I VPDSTR, FTEMP, TC, PSUR, Z2, RSOIL1, RSOIL2,
273     I VGPH1X, VGPH2X, VGRPLX,
274     O RC
275     & )
276    
277     CALL RSURFP (
278     I NCH, UM, U2FAC, Z2, RDC, SWET(1,SFCLY),
279     I ESATTC, EA,
280     U RC,
281     O RX1, RX2
282     & )
283    
284     CALL RCANOP (
285     I NCH, CAPAC, SNOW, SATCAP, RA, ETURB, SNWFRC,
286     I POTFRC,
287     U RC
288     & )
289    
290     C****
291     C**** - - - - - - - - - - - - - -
292     C****
293     C**** Compute DRC/DT and DRC/DEA using temperature, v.p. perturbations:
294     C****
295    
296     DO 120 ChNo = 1, NCH
297     TX(ChNo) = TC(ChNo) + DELTC
298     ESATTX(ChNo) = ESATTC(ChNo) + DESDTC(CHNO) * DELTC
299     EAX(ChNo) = EA(ChNo) + DELEA
300     120 CONTINUE
301     C****
302     C**** temperature:
303     CALL VPDFAC (NCH, ITYP, ESATTX, EA, VPDSTX)
304     CALL TMPFAC (NCH, ITYP, TX, FTEMPX)
305     CALL SMFAC (
306     I NCH, ITYP, ESATTX, EA, PHR, SOILCO, RCUN,
307     I VPDSTX, FTEMPX, TX, PSUR, Z2, RSOIL1, RSOIL2,
308     I VGPH1X, VGPH2X, VGRPLX,
309     O RCX
310     & )
311     CALL RSURFP (NCH, UM, U2FAC, Z2, RDC, SWET(1,SFCLY),
312     I ESATTX, EA,
313     & RCX,
314     O DUMMY,DUMMY
315     & )
316     CALL RCANOP (NCH, CAPAC, SNOW, SATCAP, RA, ETURB, SNWFRC,
317     & POTFRC, RCX)
318     C****
319     DO 125 ChNo = 1, NCH
320     DRCDTC(ChNo) = (RCX(ChNo) - RC(ChNo)) / DELTC
321     125 CONTINUE
322     C****
323     C**** vapor pressure:
324     CALL VPDFAC (NCH, ITYP, ESATTC, EAX, VPDSTX)
325     CALL SMFAC (
326     I NCH, ITYP, ESATTC, EAX, PHR, SOILCO, RCUN,
327     I VPDSTX, FTEMP, TC, PSUR, Z2, RSOIL1, RSOIL2,
328     I VGPH1X, VGPH2X, VGRPLX,
329     O RCX
330     & )
331     CALL RSURFP (NCH, UM, U2FAC, Z2, RDC, SWET(1,SFCLY),
332     I ESATTC, EAX,
333     & RCX,
334     O DUMMY,DUMMY
335     & )
336     CALL RCANOP (NCH, CAPAC, SNOW, SATCAP, RA, ETURB, SNWFRC,
337     & POTFRC, RCX)
338     C****
339     DO 150 ChNo = 1, NCH
340     DRCDEA(ChNo) = (RCX(ChNo) - RC(ChNo)) / DELEA
341     150 CONTINUE
342     C****
343    
344     C****
345     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
346     C**** STEP 2: Solve the energy balance at the surface.
347     C****
348     C****
349     C**** Determine effective latent heat of vaporization based on
350     C**** assumed fractional coverage of snow. This requires the
351     C**** determination of the fractions of moisture taken from the various
352     C**** reservoirs:
353     C**** ESNFRC=fraction of total evap. coming from snow
354     C**** EIRFRC=fraction of total evap. coming from interception res.
355    
356     DO 200 CHNO=1,NCH
357     RTBS=RX1(CHNO)*RX2(CHNO)/(RX1(CHNO)+RX2(CHNO))
358     EPFRC=POTFRC(CHNO) * ( RA(CHNO) + RTBS ) /
359     & ( RA(CHNO) + POTFRC(CHNO)*RTBS )
360     ESNFRC(CHNO)=EPFRC*SNWFRC(CHNO)/
361     & (SNWFRC(CHNO)+FCAN(CHNO)+1.E-20)
362     EIRFRC(CHNO)=EPFRC*FCAN(CHNO)/(SNWFRC(CHNO)+FCAN(CHNO)+1.E-20)
363     ALHX(CHNO) = (1.-ESNFRC(CHNO))*ALHE + ESNFRC(CHNO)*ALHS
364     200 CONTINUE
365    
366     CALL FLUXES (
367     I NCH, ITYP, DTSTEP, ESATTC, DESDTC, ALHX,
368     I ETURB, DEDEA, DEDTC, HSTURB, DHSDEA, DHSDTC,
369     I RC, DRCDEA, DRCDTC,
370     I SWNET, HLWDWN, ALWRAD, BLWRAD, ESNFRC,
371 molod 1.2 I TM, EM, CSOIL, PSUR, EMAXRT, VGWMAX,
372 molod 1.1 U TC, TD, EA, SWET, SNOW,
373     O RUNOFF, EVAP, SHFLUX, SMELT, HLWUP, BOMB,STRDG1,
374     O STRDG2, STRDG3, STRDG4, STRDG5, STRDG6, STRDG7,
375     O STRDG8, STRDG9
376     & )
377     c****
378     C****
379     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
380     C**** STEP 3: Update the water quantities in the soil and in the
381     C**** interception reservoir.
382     C**** (WUPDAT reduces moisture contents using calculated
383     C**** evap.,
384     C**** GWATER computes darcian flux of water between soil
385     C**** layers.)
386     C****
387    
388     CALL WUPDAT (
389     I NCH, ITYP, DTSTEP,
390     I EVAP, SATCAP, VGWMAX, TC, RA, RC,
391     I RX1, RX2,ESNFRC,EIRFRC,
392     U CAPAC, SNOW, SWET, RUNOFF,
393     O EINT, ESOI, EVEG, ESNO, RUNSRF,FWSOIL
394     & )
395    
396     C****
397     C**** Correct any energy balance inconsistency.
398     C****
399     DO 300 CHNO=1,NCH
400     IF(EVAP(CHNO) .GT. 0.) THEN
401     EADJST=(ESNO(CHNO)/DTSTEP) - ESNFRC(CHNO)*EVAP(CHNO)
402     SHFLUX(CHNO)=SHFLUX(CHNO)-EADJST*(ALHS-ALHE)
403     ENDIF
404     300 CONTINUE
405    
406    
407    
408     CALL SOIL (
409     I NCH, ITYP, SWET (1, SFCLY), VGBEEX,
410     I VGPSAX, VGCSAX, DELZ12,
411     O PHLAY(1,SFCLY), AKLAY(1,SFCLY), DUMMY
412     & )
413     CALL SOIL (
414     I NCH, ITYP, SWET(1,ROOTLY), VGBEEX,
415     I VGPSAX, VGCSAX, DELZ12,
416     O PHLAY(1,ROOTLY), AKLAY(1,ROOTLY), WETEQ1
417     & )
418     CALL SOIL (
419     I NCH, ITYP, SWET(1,RECHLY), VGBEEX,
420     I VGPSAX, VGCSAX, DELZ23,
421     O PHLAY(1,RECHLY), AKLAY(1,RECHLY), WETEQ2
422     & )
423    
424     CALL GWATER (
425     I NCH, ITYP, VGWMAX, PHLAY, AKLAY, TC, DTSTEP,
426     I VGZDEX, VGSLOX, WETEQ1, WETEQ2,
427     I VGPSAX, VGCSAX,
428     U SWET, RUNOFF, GDRAIN
429     & )
430    
431     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
432     C****
433     C**** STEP 4: Allow precipitation to fill interception reservoir
434     C**** and top soil layer
435     C****
436    
437     CALL SOIL (
438     I NCH, ITYP, SWET(1,ROOTLY), VGBEEX,
439     I VGPSAX, VGCSAX, DELZ12,
440     O PHLAY(1,ROOTLY), AKLAY(1,ROOTLY), WETEQ1
441     & )
442    
443     CALL INTERC (
444     I NCH, ITYP, DTSTEP, TRAINL, TRAINC, TSNOW, SATCAP,
445     I VGWMAX, CSOIL, WETEQ1,
446     U TC, CAPAC, SNOW, SWET, RUNOFF, RUNSRF,
447     & SMELT, FWSOIL
448     & )
449    
450    
451     C****
452     C****
453     C**** Process data for return to GCM:
454    
455     DO 2000 ChNo = 1, NCH
456     QA(CHNO) = EA(CHNO) * EPSILON / PSUR(CHNO)
457     C DEDTC(CHNO) = DEDTC(CHNO) * ALHX(CHNO)
458     C ETURB(CHNO) = ETURB(CHNO) * ALHX(CHNO)
459     HLATN (CHNO) = EVAP (CHNO) * ALHX(CHNO)
460     SWET1(ChNo) = SWET(ChNo,SFCLY)
461     SWET2(ChNo) = SWET(ChNo,ROOTLY)
462     SWET3(ChNo) = SWET(ChNo,RECHLY)
463    
464     IF(SWET1(ChNo).LT.1.E-10) SWET1(CHNO) = 0.0
465     IF(SWET2(ChNo).LT.1.E-10) SWET2(CHNO) = 0.0
466     IF(SWET3(ChNo).LT.1.E-10) SWET3(CHNO) = 0.0
467     IF(CAPAC(ChNo).LT.1.E-10) CAPAC(CHNO) = 0.0
468     IF(SNOW (ChNo).LT.1.E-10) SNOW (CHNO) = 0.0
469     IF(RUNOFF(ChNo).LT.1.E-10) RUNOFF(CHNO) = 0.0
470    
471     EINT(CHNO) = EINT(CHNO) * ALHE / DTSTEP
472     ESOI(CHNO) = ESOI(CHNO) * ALHE / DTSTEP
473     EVEG(CHNO) = EVEG(CHNO) * ALHE / DTSTEP
474     ESNO(CHNO) = ESNO(CHNO) * ALHS / DTSTEP
475    
476     DEFCIT = EVAP(CHNO) * ( RC(CHNO) + RA(CHNO) )
477     CCOOMMSTRDG1(CHNO) = DEFCIT / RA(CHNO)
478     CCOOMMSTRDG2(CHNO) = DEFCIT / ( RA(CHNO) + RCUN(CHNO) )
479     CCOOMMSTRDG3(CHNO) = DEFCIT / ( RA(CHNO) + RCUN(CHNO)/VPDSTR(CHNO) )
480     CCOOMMSTRDG4(CHNO) = DEFCIT / ( RA(CHNO) +
481     CCOOMM RCUN(CHNO)/(VPDSTR(CHNO)*FTEMP(CHNO)) )
482    
483     2000 CONTINUE
484     C****
485    
486     RETURN
487     END
488     C****
489     C**** [ END CHIP ]
490     C****
491     C**** -----------------------------------------------------------------
492     C**** /////////////////////////////////////////////////////////////////
493     C**** -----------------------------------------------------------------
494     C****
495     C**** [ BEGIN INTERC ]
496     C****
497     SUBROUTINE INTERC (
498     I NCH, ITYP, DTSTEP, TRAINL, TRAINC,
499     I TSNOW, SATCAP, WMAX, CSOIL, WETEQ1,
500     U TC, CAPAC, SNOW, SWET1, RUNOFF, RUNSRF,
501     U SMELT, FWSOIL
502     & )
503     C****
504     C**** This routine uses the precipitation forcing to determine
505     C**** changes in interception, snowcover, and soil moisture storage.
506     C****
507     C**** Note: In this formulation, rain that falls on frozen ground
508     C**** runs-off, rather than freezes.
509     C****
510     IMPLICIT NONE
511     C****
512 molod 1.2 #include "sibber.h"
513 molod 1.1 C****
514     INTEGER NCH
515     INTEGER ITYP(NCH), ChNo
516 molod 1.4 _RL TRAINL(NCH), TRAINC(NCH), TSNOW(NCH), SATCAP(NCH),
517 molod 1.1 & WMAX(NLAY,NTYPS), TC(NCH), CSOIL(NCH), CAPAC(NCH),
518     & SNOW(NCH), SWET1(NCH), RUNOFF(NCH), SMELT(NCH),
519     & RUNSRF(NCH), FWSOIL(NCH), WETEQ1(NCH), WETINT
520 molod 1.4 _RL DTSTEP, SNOWM, WATADD, CAVAIL, THRUC, WRUNC, WRUNL,
521 molod 1.1 & TIMFRL, TIMFRC, FWETL, FWETC, THRU1, THRU2, THRUL, XTCORR,
522     & WETFRC
523     C****
524     C DATA FWET0 /0.30/
525     DATA FWETL /1.00/, FWETC /0.20/, TIMFRL/1.00/, TIMFRC/0.125/
526     C****
527     C**** ------------------------------------------------------------------
528     C**** Loop over chips:
529     DO 100 ChNo = 1, NCH
530     C****
531     C**** Add to snow cover. Melt snow if necessary.
532     SNOW(ChNo) = SNOW(ChNo) + TSNOW(ChNo)*DTSTEP
533     SNOWM = 0.
534     IF( SNOW(CHNO).GT.0. .AND. TC(CHNO).GT.TF ) THEN
535     SNOWM = MIN( SNOW(ChNo),
536 ce107 1.6 & MAX( 0. _d 0, (TC(ChNo)-TF)*CSOIL(ChNo)/ALHM ) )
537 molod 1.1 IF( SNOWM .EQ. SNOW(CHNO) ) THEN
538     TC(ChNo) = TC(ChNo) - SNOWM * ALHM / CSOIL(ChNo)
539     SNOW(CHNO)=0.
540     ELSE
541     TC(CHNO)=TF
542     SNOW(ChNo) = SNOW(ChNo) - SNOWM
543     ENDIF
544     SMELT(CHNO)=SMELT(CHNO)+SNOWM/DTSTEP
545     ENDIF
546     C****
547     C**** =======================================================
548     C****
549     C**** Load interception reservoir. STEP 1: Large scale condensation.
550     C****
551     C**** Determine XTCORR, the fraction of a storm that falls on a previously
552     C**** wet surface due to the time correlation of precipitation position.
553     C**** (Time scale TIMFRL for large scale storms set to one for FWETL=1
554     C**** to reflect the effective loss of "position memory" when storm
555     C**** covers entire grid square.)
556    
557 ce107 1.6 XTCORR= (1.-TIMFRL) * MIN( 1. _d 0,(CAPAC(CHNO)/SATCAP(CHNO))/FWETL )
558 molod 1.1
559     C****
560     C**** Fill interception reservoir with precipitation.
561     C**** THRU1 is first calculated as the amount falling through the
562     C**** canopy under the assumption that all rain falls randomly.
563     C**** only a fraction 1-XTCORR falls randomly, though, so the result
564     C**** is multiplied by 1-XTCORR.
565     C****
566     WATADD = TRAINL(ChNo)*DTSTEP + SMELT(CHNO)*DTSTEP
567     CAVAIL = ( SATCAP(CHNO) - CAPAC(CHNO) ) * FWETL
568     WETINT = CAPAC(CHNO)/SATCAP(CHNO)
569     IF( WATADD*(1.-WETINT) .LT. CAVAIL ) THEN
570     THRU1 = WATADD*WETINT
571     ELSE
572     THRU1 = (WATADD - CAVAIL)
573     ENDIF
574     THRU1=THRU1*(1.-XTCORR)
575    
576     C**** THRU2 is the amount that falls immediately through the canopy due
577     C**** to 'position memory'.
578    
579     THRU2=XTCORR*WATADD
580    
581     THRUL=THRU1+THRU2
582     CAPAC(CHNO)=CAPAC(CHNO)+WATADD-THRU1-THRU2
583     C****
584     C**** ---------------------------------------------------
585     C****
586     C**** STEP 2: Moist convective precipitation.
587     C****
588     C**** Determine XTCORR, the fraction of a storm that falls on a previously
589     C**** wet surface due to the time correlation of precipitation position.
590    
591 ce107 1.6 XTCORR= (1.-TIMFRC) * MIN( 1. _d 0,(CAPAC(CHNO)/SATCAP(CHNO))/FWETC )
592 molod 1.1
593     C****
594     C**** Fill interception reservoir with precipitation.
595     C**** THRU1 is first calculated as the amount falling through the
596     C**** canopy under the assumption that all rain falls randomly.
597     C**** only a fraction 1-XTCORR falls randomly, though, so the result
598     C**** is multiplied by 1-XTCORR.
599     C****
600     WATADD = TRAINC(ChNo)*DTSTEP
601     CAVAIL = ( SATCAP(CHNO) - CAPAC(CHNO) ) * FWETC
602     WETINT = CAPAC(CHNO)/SATCAP(CHNO)
603     IF( WATADD*(1.-WETINT) .LT. CAVAIL ) THEN
604     THRU1 = WATADD*WETINT
605     ELSE
606     THRU1 = (WATADD - CAVAIL)
607     ENDIF
608     THRU1=THRU1*(1.-XTCORR)
609    
610     C**** THRU2 is the amount that falls immediately through the canopy due
611     C**** to 'position memory'.
612    
613     THRU2=XTCORR*WATADD
614    
615     THRUC=THRU1+THRU2
616     CAPAC(CHNO)=CAPAC(CHNO)+WATADD-THRU1-THRU2
617     C****
618     C***** =================================================================
619     C****
620     C**** Add precipitation moisture to soil, generate runoff. if
621     C**** temperature is below freezing, all precipitation runs off.
622     C****
623     C**** STEP 1: Large scale condensation:
624     C****
625     IF(SWET1(CHNO).GT.WETEQ1(CHNO) .AND. WETEQ1(CHNO).NE.1.) THEN
626     WETFRC=(SWET1(CHNO)-WETEQ1(CHNO))/(1.-WETEQ1(CHNO))
627     ELSE
628     WETFRC=0.
629     ENDIF
630    
631     CAVAIL = ( 1.-WETFRC)*FWETL*WMAX(1,ITYP(ChNo))*(1-WETEQ1(CHNO))
632     IF ( THRUL * (1-WETFRC) .LT. CAVAIL ) THEN
633     WRUNL = THRUL * WETFRC
634     SWET1(ChNo) = SWET1(ChNo)
635     * + THRUL * ( 1. - WETFRC) / WMAX(1,ITYP(ChNo))
636     ELSE
637     WRUNL = THRUL - CAVAIL
638     SWET1(CHNO) = SWET1(CHNO) + CAVAIL / WMAX(1,ITYP(ChNo))
639     ENDIF
640     C****
641    
642     C**** STEP 2: Moist convective precipitation:
643     C****
644     IF(SWET1(CHNO).GT.WETEQ1(CHNO) .AND. WETEQ1(CHNO).NE.1.) THEN
645     WETFRC=(SWET1(CHNO)-WETEQ1(CHNO))/(1.-WETEQ1(CHNO))
646     ELSE
647     WETFRC=0.
648     ENDIF
649    
650     CAVAIL = (1.-WETFRC)*FWETC*WMAX(1,ITYP(ChNo))*(1-WETEQ1(CHNO))
651     IF ( THRUC * (1-WETFRC) .LT. CAVAIL ) THEN
652     WRUNC = THRUC * WETFRC
653     SWET1(ChNo) = SWET1(ChNo)
654     * + THRUC * ( 1. - WETFRC) / WMAX(1,ITYP(ChNo))
655     ELSE
656     WRUNC = THRUC - CAVAIL
657     SWET1(CHNO) = SWET1(CHNO) + CAVAIL / WMAX(1,ITYP(ChNo))
658     ENDIF
659     C****
660     RUNOFF(ChNo) = RUNOFF(ChNo) + (WRUNC+WRUNL)/DTSTEP
661     RUNSRF(ChNo) = RUNSRF(ChNo) + (WRUNC+WRUNL)/DTSTEP
662     FWSOIL(CHNO) = FWSOIL(CHNO) + (THRUC+THRUL-WRUNC-WRUNL)/DTSTEP
663     C****
664     100 CONTINUE
665     C****
666     RETURN
667     END
668     C****
669     C**** [ END INTERC ]
670     C****
671     C**** -----------------------------------------------------------------
672     C**** /////////////////////////////////////////////////////////////////
673     C**** -----------------------------------------------------------------
674     C****
675     C**** [ BEGIN RCUNST ]
676     C****
677     SUBROUTINE RCUNST (
678     I NCH, ITYP, SUNANG, SQSCAT, PDIR,
679     I PAR, ZLAI, GREEN,
680     O RCUN
681     & )
682     C****
683     C**** This subroutine calculates the unstressed canopy resistance.
684     C**** (p. 1353, Sellers 1985.) Extinction coefficients are computed first.
685     C****
686     IMPLICIT NONE
687     C****
688 molod 1.2 #include "sibber.h"
689 molod 1.1 C****
690     INTEGER NCH
691     INTEGER ITYP(NCH), ChNo
692    
693 molod 1.4 _RL SUNANG(NCH), PDIR(NCH), PAR(NCH), ZLAI(NCH),
694 molod 1.1 & SQSCAT(NCH), GREEN(NCH), RCUN(NCH)
695    
696 molod 1.4 _RL VGCHIL(NTYPS), VGZMEW(NTYPS),
697 molod 1.1 & VGRST1(NTYPS), VGRST2(NTYPS), VGRST3(NTYPS)
698    
699 molod 1.4 _RL RHO4, EXTK1, EXTK2,
700 molod 1.1 & RCINV, GAMMA, EKAT, DUM1,
701     & DUM2, DUM3, AA, BB,
702     & ZK, CC
703    
704    
705     DATA VGCHIL / 0.1, 0.25, 0.01, -0.3,
706     5 0.01, 0.20, 0.0, 0.0,
707     9 0.0, 0.0 /
708    
709     DATA VGZMEW/ 0.9809, 0.9638, 0.9980, 1.0773,
710     5 0.9980, 0.9676, 1.000, 1.000,
711     9 1.000, 1.0000 /
712    
713     DATA VGRST1 / 2335.9, 9802.2, 2869.7, 2582.0,
714     5 93989.4, 9802.2, 0.0, 0.0,
715     9 0.0 , 0.0/
716    
717     DATA VGRST2 / 0.0, 10.6, 3.7, 1.1,
718     5 0.01, 10.6, 0.0, 0.0,
719     9 0.0 , 0.0/
720    
721     DATA VGRST3 / 153.5, 180.0, 233.0, 110.0,
722     5 855.0, 180.0, 1.0, 1.0,
723     9 1.0, 1.0 /
724    
725    
726    
727    
728     DO 100 ChNo = 1, NCH
729    
730     C**** First compute optical parameters.
731     C**** (Note: CHIL is constrained to be >= 0.01, as in SiB calcs.)
732    
733     AA = 0.5 - (0.633 + 0.330*VGCHIL(ITYP(ChNo)))*VGCHIL(ITYP(ChNo))
734     BB = 0.877 * ( ONE - 2.*AA )
735     CC = ( AA + BB*SUNANG(ChNo) ) / SUNANG(ChNo)
736    
737     EXTK1 = CC * SQSCAT(ChNo)
738     EXTK2 = (ONE / VGZMEW(ITYP(ChNo))) * SQSCAT(ChNo)
739    
740     DUM1 = PDIR(ChNo) * CC
741     DUM2 = (ONE-PDIR(ChNo)) * ( BB*(ONE/3.+PIE/4.) + AA*1.5 )
742    
743     C**** Bound extinction coefficient by 50./ZLAI:
744    
745 ce107 1.6 ZK = PDIR(ChNo) *MIN( EXTK1, 50. _d 0/ZLAI(ChNo) ) +
746     & (ONE-PDIR(ChNo))*MIN( EXTK2, 50. _d 0/ZLAI(ChNo) )
747 molod 1.1
748     C**** Now compute unstressed canopy resistance:
749    
750     GAMMA = VGRST1(ITYP(ChNo)) / VGRST3(ITYP(ChNo)) +
751     & VGRST2(ITYP(ChNo))
752    
753     EKAT = EXP( ZK*ZLAI(ChNo) )
754     RHO4 = GAMMA / (PAR(ChNo) * (DUM1 + DUM2))
755    
756     DUM1 = (VGRST2(ITYP(ChNo)) - GAMMA) / (GAMMA + 1.E-20)
757     DUM2 = (RHO4 * EKAT + ONE) / (RHO4 + ONE)
758     DUM3 = ZK * VGRST3(ITYP(ChNo))
759     RCINV = ( DUM1*LOG(DUM2) + ZK*ZLAI(ChNo) ) / DUM3
760    
761     RCUN(ChNo) = ONE / (RCINV * GREEN(ChNo) + 1.E-10)
762    
763     100 CONTINUE
764    
765    
766     RETURN
767     END
768     C****
769     C**** [ END RCUNST ]
770     C****
771     C**** -----------------------------------------------------------------
772     C**** /////////////////////////////////////////////////////////////////
773     C**** -----------------------------------------------------------------
774     C****
775     C**** [ BEGIN SOIL ]
776     C****
777     SUBROUTINE SOIL (
778     I NCH, ITYP, WET, VGBEEX, VGPSAX, VGCSAX, DELZ,
779     O PHR, SOILCO, WETEQ
780     & )
781     C****
782     C**** This subroutine returns soil moisture potential and conductivity.
783    
784     IMPLICIT NONE
785     C****
786 molod 1.2 #include "sibber.h"
787 molod 1.1 C****
788     INTEGER NCH
789     INTEGER ITYP(NCH), ChNo
790    
791 molod 1.4 _RL WET(NCH), PHR(NCH), SOILCO(NCH), VGPSAX(NCH),
792 molod 1.1 & VGCSAX(NCH), VGBEEX(NCH), DELZ(NTYPS), WETEQ(NCH),
793     & WEXPB, WET0, PHEQ
794    
795     DO 100 ChNo = 1, NCH
796    
797 ce107 1.6 WET0 = MAX(WET(CHNO),0.01 _d 0)
798 molod 1.1 WEXPB = WET0**VGBEEX(ChNo)
799    
800     PHR(ChNo) = VGPSAX(ChNo) / WEXPB
801     SOILCO(ChNo) = VGCSAX(ChNo) * WEXPB * WEXPB * WET0 * WET0 * WET0
802    
803     PHEQ = PHR(CHNO) - DELZ(ITYP(CHNO))
804     WETEQ(CHNO) = ( PHEQ/VGPSAX(CHNO) ) ** ( -1/VGBEEX(CHNO) )
805    
806     100 CONTINUE
807    
808     RETURN
809     END
810     C****
811     C**** [ END SOIL ]
812     C****
813     C**** -----------------------------------------------------------------
814     C**** /////////////////////////////////////////////////////////////////
815     C**** -----------------------------------------------------------------
816     C****
817     C**** [ BEGIN FLUXES ]
818     C****
819     SUBROUTINE FLUXES (
820     I NCH, ITYP, DTSTEP, ESATTC, DESDTC, ALHX,
821     I ETURB, DEDEA, DEDTC, HSTURB, DHSDEA, DHSDTC,
822     I RC, DRCDEA, DRCDTC,
823     I SWNET, HLWDWN, ALWRAD, BLWRAD, ESNFRC,
824     I TM, EM, CSOIL, PSUR, EMAXRT, WMAX,
825     U TC, TD, EA, SWET1, SNOW,
826     O RUNOFF, EVAP, SHFLUX, SMELT, HLWUP, BOMB, STRDG1,
827     O STRDG2, STRDG3, STRDG4, STRDG5, STRDG6, STRDG7,
828     O STRDG8, STRDG9
829     & )
830     C****
831     C**** This subroutine computes the fluxes of latent and sensible heat
832     C**** from the surface through an energy balance calculation.
833     C****
834     IMPLICIT NONE
835     C****
836 molod 1.2 #include "sibber.h"
837 molod 1.1 C****
838     INTEGER NCH
839     INTEGER ITYP(NCH), ChNo
840    
841 molod 1.4 _RL DTSTEP, ESATTC(NCH), DESDTC(NCH), ALHX(NCH),
842 molod 1.1 & ETURB(NCH), DEDEA(NCH), DEDTC(NCH),
843     & HSTURB(NCH), DHSDEA(NCH), DHSDTC(NCH),
844     & RC(NCH), DRCDEA(NCH), DRCDTC(NCH),
845     & SWNET(NCH), HLWDWN(NCH), ALWRAD(NCH), BLWRAD(NCH),
846     & TM(NCH), EM(NCH), CSOIL(NCH), PSUR(NCH),
847     & EMAXRT(NCH), WMAX(NLAY,NTYPS),
848     & TC(NCH), TD(NCH), EA(NCH), ESNFRC(NCH),
849     & SWET1(NCH,NLAY), SNOW(NCH),
850     & RUNOFF(NCH), EVAP(NCH), SHFLUX(NCH), SMELT(NCH),
851     & HLWUP(NCH), BOMB(NCH)
852 molod 1.4 _RL STRDG1(NCH),STRDG2(NCH),STRDG3(NCH),STRDG4(NCH)
853     _RL STRDG5(NCH),STRDG6(NCH),STRDG7(NCH),STRDG8(NCH)
854     _RL STRDG9(NCH)
855 molod 1.1
856 molod 1.4 _RL HLWTC, CDEEPS, Q0, RHOAIR, CONST, DHLWTC,
857 molod 1.1 & EPLANT, A11, A12, A21, A22, F0,
858     & DEA, DTC, SNLEFT, Q0X, Q0SNOW,
859     & EANEW, ESATNW, EHARMN, DETERM, DENOM
860    
861 molod 1.3 LOGICAL CHOKE
862 molod 1.4 _RL deepfac(ntyps)
863 molod 1.1 DATA deepfac /1.,1.,1.,1.,1.,1.,1.,1.,1.,1./
864     C****
865     C**** -------------------------------------------------------------------
866    
867     DO 200 ChNo = 1, NCH
868     C****
869     HLWTC = ALWRAD(CHNO) + BLWRAD(CHNO) * TC(CHNO)
870     CDEEPS = PIE * CSOIL(ChNo) * 2. / 86400.
871     RHOAIR = PSUR(ChNo) * 100. / (RGAS * TC(ChNo))
872     CONST = RHOAIR * EPSILON / PSUR(ChNo)
873     DHLWTC = BLWRAD(CHNO)
874     C****
875     C**** Compute matrix elements A11, A22, AND Q0 (energy balance equation).
876     C****
877 molod 1.5
878 molod 1.1 A11 = CSOIL(ChNo)/DTSTEP +
879     & DHLWTC +
880     & DHSDTC(ChNo) +
881     & ALHX(CHNO)*DEDTC(ChNo) +
882     & CDEEPS
883     A12 = DHSDEA(ChNo) + ALHX(CHNO) * DEDEA(ChNo)
884     Q0 = SWNET(ChNo) +
885     & HLWDWN(ChNo) -
886     & HLWTC -
887     & HSTURB(ChNo) -
888     & ALHX(CHNO) * ETURB(ChNo) -
889     & CDEEPS * (TC(ChNo) - TD(ChNo))
890    
891     STRDG3(ChNo)=Q0/A11
892     STRDG4(ChNo)=(SWNET(ChNo)+HLWDWN(ChNo)-HLWTC)/A11
893     STRDG5(ChNo)=HSTURB(ChNo)/A11
894     STRDG6(ChNo)=ALHX(CHNO)*ETURB(ChNo)/A11
895     STRDG7(ChNo)=CDEEPS*(TC(ChNo) - TD(ChNo))/A11
896     STRDG9(ChNo)=A11
897    
898     C****
899     C**** Compute matrix elements A21, A22, and F0 (canopy water budget
900     C**** equation) and solve for fluxes. Three cases are considered:
901     C****
902     C**** 1. Standard case: RC>0.
903     C**** 2. RC = 0. Can only occur if CIR is full or ETURB is negative.
904     C****
905     CHOKE = .TRUE.
906    
907     IF( RC(CHNO) .GT. 0.) THEN
908     EPLANT = CONST * (ESATTC(ChNo) - EA(ChNo)) / RC(ChNo)
909     IF(EPLANT*ETURB(ChNo).GE.0.) THEN
910     EHARMN = 2.*EPLANT*ETURB(CHNO) / (EPLANT + ETURB(ChNo))
911     ELSE
912     EHARMN=0.
913     ENDIF
914     C****
915     C**** Some limitations to A21 and A22 are applied:
916     C**** we assume that the increase in plant evaporation
917     C**** due to an increase in either TC or EA balances
918     C**** or outweighs any decrease due to RC changes.
919     C****
920    
921     A21 = -DEDTC(ChNo)*RC(ChNo) +
922 ce107 1.6 & max(0. _d 0, CONST*DESDTC(ChNo) - EHARMN*DRCDTC(ChNo) )
923 molod 1.1 A22 = -( RC(ChNo)*DEDEA(ChNo) +
924 ce107 1.6 & max( 0. _d 0, CONST + EHARMN*DRCDEA(ChNo) ) )
925 molod 1.1
926     F0 = RC(ChNo) * (ETURB(ChNo) - EPLANT)
927 ce107 1.6 DETERM = MIN( A12*A21/(A11*A22) - 1., -0.1 _d 0)
928 molod 1.1 DEA = ( Q0*A21 - A11*F0 ) / ( DETERM * A11*A22 )
929     DTC = ( Q0 - A12*DEA ) / A11
930    
931     STRDG1(ChNo)=DTC
932     STRDG2(ChNo)=DEA
933     STRDG8(ChNo)=-A12*DEA/A11
934    
935     EVAP(ChNo) = ETURB(ChNo) + DEDEA(ChNo)*DEA + DEDTC(ChNo)*DTC
936     SHFLUX(ChNo) = HSTURB(ChNo) + DHSDEA(ChNo)*DEA +
937     & DHSDTC(ChNo)*DTC
938     DENOM = DETERM * A11*A22
939     ELSE
940     CHOKE = .FALSE.
941     A21 = -DESDTC(ChNo)
942     A22 = 1.
943     F0 = ESATTC(ChNo) - EA(ChNo)
944     DEA = ( Q0*A21 - A11*F0 ) / ( A12*A21 - A11*A22 )
945     DTC = ( Q0 - A12*DEA ) / A11
946    
947     STRDG1(ChNo)=DTC
948     STRDG2(ChNo)=DEA
949     STRDG8(ChNo)=-A12*DEA/A11
950    
951     EVAP(ChNo) = ETURB(ChNo) + DEDEA(ChNo)*DEA + DEDTC(ChNo)*DTC
952     SHFLUX(ChNo) = HSTURB(ChNo) + DHSDEA(ChNo)*DEA +
953     & DHSDTC(ChNo)*DTC
954     DENOM = A12 * A21 - A11*A22
955     ENDIF
956    
957    
958     C**** - - - - - - - - - - - - - - - - - - - -
959     C**** Account for snowmelt, if necessary.
960     C**** - - - - - - - - - - - - - - - - - - - -
961     SMELT(CHNO)=0.
962     SNLEFT=SNOW(CHNO)-EVAP(CHNO)*DTSTEP*ESNFRC(CHNO)
963     IF(TC(CHNO)+DTC .GT. TF .AND. SNLEFT.GT.0.) THEN
964    
965     C**** First re-calculate energy balance under assumption that all
966     C**** snow is melted.
967    
968     Q0X=Q0-ALHM*SNLEFT/DTSTEP
969     SMELT(CHNO)=SNLEFT/DTSTEP
970    
971     DEA = ( Q0X*A21 - A11*F0 ) / DENOM
972     DTC = ( Q0X - A12*DEA ) / A11
973    
974     C**** If TC+DTC is now less than TF, too much snow has melted. Now
975     C**** solve for balance assuming only some of the snow has melted.
976     C**** Set TC to TF.
977    
978     IF(TC(CHNO)+DTC .LT. TF) THEN
979     DTC=TF-TC(CHNO)
980     DEA=(F0-A21*DTC)/A22
981     Q0SNOW=A11*DTC+A12*DEA
982     SMELT(CHNO)=(Q0-Q0SNOW)/ALHM
983     ENDIF
984    
985     STRDG1(ChNo)=DTC
986     STRDG2(ChNo)=DEA
987     STRDG8(ChNo)=-A12*DEA/A11
988    
989     EVAP(ChNo) = ETURB(ChNo) + DEDEA(ChNo)*DEA +
990     & DEDTC(ChNo)*DTC
991     SHFLUX(ChNo) = HSTURB(ChNo) + DHSDEA(ChNo)*DEA +
992     & DHSDTC(ChNo)*DTC
993    
994     ENDIF
995    
996     C**** - - - - - - - - - - - - - - - - - - - - - - -
997     C**** Adjustments
998    
999     C**** 1. Adjust deltas and fluxes if all available water evaporates
1000     C**** during time step:
1001     C****
1002     IF( EVAP(CHNO) .GT. EMAXRT(CHNO) ) THEN
1003     CHOKE = .FALSE.
1004     DEA = EM(CHNO) - EA(CHNO)
1005     DTC =
1006 molod 1.2 & (Q0 + ALHX(CHNO)*(ETURB(ChNo)-EMAXRT(CHNO)) - DHSDEA(CHNO)*DEA)
1007 molod 1.1 & / ( A11 - ALHX(CHNO)*DEDTC(ChNo) )
1008    
1009     STRDG1(ChNo)=DTC
1010     STRDG2(ChNo)=DEA
1011     STRDG8(ChNo)=0.
1012    
1013     EVAP(CHNO) = EMAXRT(CHNO)
1014     SHFLUX(ChNo) = HSTURB(ChNo) + DHSDEA(ChNo)*DEA +
1015     & DHSDTC(ChNo)*DTC
1016     SMELT(CHNO)=0.
1017     ENDIF
1018     C****
1019     C**** Adjust DEA and DTC if solutions were pathological:
1020     C****
1021     ESATNW = ESATTC(CHNO)+DESDTC(CHNO)*DTC
1022     EANEW = EA(CHNO) + DEA
1023    
1024    
1025    
1026     C**** 2. Pathological cases.
1027    
1028     C**** Case 1: EVAP is positive in presence of negative gradient.
1029     C**** Case 2: EVAP and ETURB have opposite sign, implying that
1030     C**** "virtual effects" derivatives are meaningless and thus that we
1031     C**** don't know the proper tendency terms.
1032     C**** In both cases, assume zero evaporation for the time step.
1033    
1034     C IF( ( EVAP(CHNO) .LT. 0. .AND. EM(CHNO).LT.ESATNW )
1035     C & .OR. ( EVAP(CHNO)*ETURB(CHNO) .LT. 0. ) ) THEN
1036     IF( EVAP(CHNO) .LT. 0. .AND. EM(CHNO).LT.ESATNW ) THEN
1037     CHOKE = .FALSE.
1038     DEA = EM(CHNO) - EA(CHNO)
1039     DTC = ( Q0 + ALHX(CHNO)*ETURB(ChNo) - DHSDEA(CHNO)*DEA ) /
1040     & ( A11 - ALHX(CHNO)*DEDTC(ChNo) )
1041    
1042     STRDG1(ChNo)=DTC
1043     STRDG2(ChNo)=DEA
1044     STRDG8(ChNo)=0.
1045    
1046     EVAP(CHNO) = 0.
1047     SHFLUX(ChNo) = HSTURB(ChNo) + DHSDEA(ChNo)*DEA +
1048     & DHSDTC(ChNo)*DTC
1049    
1050     IF(TC(CHNO)+DTC .GT. TF .AND. SNOW(CHNO).GT.0.) THEN
1051     Q0X=Q0-ALHM*SNOW(CHNO)/DTSTEP
1052     SMELT(CHNO)=SNOW(CHNO)/DTSTEP
1053     DTC = ( Q0X + ALHX(CHNO)*ETURB(ChNo) - DHSDEA(CHNO)*DEA ) /
1054     & ( A11 - ALHX(CHNO)*DEDTC(ChNo) )
1055     IF(TC(CHNO)+DTC .LT. TF) THEN
1056     DTC=TF-TC(CHNO)
1057     Q0SNOW=A11*DTC+A12*DEA
1058     SMELT(CHNO)=(Q0-Q0SNOW)/ALHM
1059     ENDIF
1060     SHFLUX(ChNo) = HSTURB(ChNo) + DHSDEA(ChNo)*DEA +
1061     & DHSDTC(ChNo)*DTC
1062     ENDIF
1063     ENDIF
1064    
1065    
1066    
1067     C**** 3. Exceesive dea change: apply "choke".
1068    
1069     IF( CHOKE .AND. ABS(DEA) .GT. 0.5*EA(CHNO) ) THEN
1070     DEA = SIGN(.5*EA(CHNO),DEA)
1071     DTC = ( Q0 - A12*DEA ) / A11
1072    
1073     STRDG1(ChNo)=DTC
1074     STRDG2(ChNo)=DEA
1075     STRDG8(ChNo)=-A12*DEA/A11
1076    
1077     EVAP(ChNo) = ETURB(ChNo) + DEDEA(ChNo)*DEA + DEDTC(ChNo)*DTC
1078     SHFLUX(ChNo) = HSTURB(ChNo) + DHSDEA(ChNo)*DEA +
1079     & DHSDTC(ChNo)*DTC
1080     IF(TC(CHNO)+DTC .GT. TF .AND. SNOW(CHNO).GT.0.) THEN
1081     SNLEFT=SNOW(CHNO)-EVAP(CHNO)*DTSTEP*ESNFRC(CHNO)
1082     Q0X=Q0-ALHM*SNLEFT/DTSTEP
1083     SMELT(CHNO)=SNLEFT/DTSTEP
1084     DTC = ( Q0X - A12*DEA ) / A11
1085     IF(TC(CHNO)+DTC .LT. TF) THEN
1086     DTC=TF-TC(CHNO)
1087     Q0SNOW=A11*DTC+A12*DEA
1088     SMELT(CHNO)=(Q0-Q0SNOW)/ALHM
1089     ENDIF
1090     EVAP(ChNo) = ETURB(ChNo) + DEDEA(ChNo)*DEA + DEDTC(ChNo)*DTC
1091     SHFLUX(ChNo) = HSTURB(ChNo) + DHSDEA(ChNo)*DEA +
1092     & DHSDTC(ChNo)*DTC
1093     ENDIF
1094     ENDIF
1095    
1096     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1097    
1098     TC(ChNo) = TC(ChNo) + DTC
1099     EA(ChNo) = EA(ChNo) + DEA
1100     TD(ChNo) = TD(ChNo) +
1101     c CHANGED THIS: deep layer 2 times deeper
1102     & DTSTEP * CDEEPS * (TC(ChNo) - TD(ChNo)) /
1103     . (CSOIL(ChNo)*67.73*deepfac(ityp(ChNo)))
1104     HLWUP(CHNO) = HLWTC + DHLWTC*DTC
1105    
1106     SNOW(CHNO)=SNOW(CHNO)-SMELT(CHNO)*DTSTEP
1107    
1108     C**** Make sure EA remains positive
1109    
1110 ce107 1.6 EA(CHNO) = MAX(EA(CHNO), 0.0 _d 0)
1111 molod 1.1
1112     200 CONTINUE
1113    
1114    
1115    
1116     RETURN
1117     END
1118     C****
1119     C**** [ END FLUXES ]
1120     C****
1121     C**** -----------------------------------------------------------------
1122     C**** /////////////////////////////////////////////////////////////////
1123     C**** -----------------------------------------------------------------
1124     C****
1125     C**** [ BEGIN VPDFAC ]
1126     C****
1127     SUBROUTINE VPDFAC (
1128     I NCH, ITYP, ESATTC, EA,
1129     O VPDSTR
1130     & )
1131     C****
1132     C**** This subroutine computes the vapor pressure deficit stress.
1133     C****
1134     IMPLICIT NONE
1135     C****
1136 molod 1.2 #include "sibber.h"
1137 molod 1.1 C****
1138     INTEGER NCH
1139     INTEGER ITYP(NCH), ChNo
1140 molod 1.4 _RL ESATTC(NCH), EA(NCH), VPDSTR(NCH)
1141     c _RL VGDFAC(NTYPS)
1142 molod 1.1 C****
1143 molod 1.3 c DATA VGDFAC / .0273, .0357, .0310, .0238,
1144     c 5 .0275, .0275, 0., 0.,
1145     c 9 0., 0. /
1146 molod 1.1 C****
1147     C**** -----------------------------------------------------------------
1148    
1149     DO 100 ChNo = 1, NCH
1150     C****
1151     c VPDSTR(ChNo) = 1. - (ESATTC(ChNo)-EA(ChNo)) * VGDFAC(ITYP(ChNo))
1152 ce107 1.6 c VPDSTR (ChNo) = MIN( 1. _d 0, MAX( VPDSTR(ChNo), 1. _d -10 ) )
1153 molod 1.1 VPDSTR(CHNO) = 1.
1154     C****
1155     100 CONTINUE
1156     C****
1157     RETURN
1158     END
1159     C****
1160     C**** [ END VPDFAC ]
1161     C****
1162     C**** -----------------------------------------------------------------
1163     C**** /////////////////////////////////////////////////////////////////
1164     C**** -----------------------------------------------------------------
1165     C****
1166     C**** [ BEGIN TMPFAC ]
1167     C****
1168     SUBROUTINE TMPFAC (
1169     I NCH, ITYP, TC,
1170     O FTEMP
1171     & )
1172     C****
1173     C**** Compute temperature stress factor.
1174     C****
1175     IMPLICIT NONE
1176     C****
1177 molod 1.2 #include "sibber.h"
1178 molod 1.1 C****
1179     INTEGER NCH
1180     INTEGER ITYP(NCH), ChNo, TypPtr
1181 molod 1.4 _RL TC(NCH), FTEMP(NCH)
1182     _RL VGTLL(MemFac*NTYPS), VGTU(MemFac*NTYPS),
1183 molod 1.1 & VGTCF1(MemFac*NTYPS), VGTCF2(MemFac*NTYPS),
1184     & VGTCF3(MemFac*NTYPS)
1185     C****
1186     DATA VGTLL /MemFac*273., MemFac*273., MemFac*268., MemFac*283.,
1187     5 MemFac*283., MemFac*273., MemFac* 0., MemFac* 0.,
1188     9 MemFac* 0., MemFac* 0. /
1189     DATA VGTU /MemFac*318., MemFac*318., MemFac*313., MemFac*328.,
1190     5 MemFac*323., MemFac*323., MemFac* 0., MemFac* 0.,
1191     9 MemFac* 0. , MemFac* 0./
1192     DATA VGTCF1 / MemFac*-1.43549E-06, MemFac*-6.83584E-07,
1193     3 MemFac* 1.67699E-07, MemFac*-1.43465E-06,
1194     5 MemFac*-2.76097E-06, MemFac*-1.58094E-07,
1195     7 MemFac* 0., MemFac* 0.,
1196     9 MemFac* 0. , MemFac* 0./
1197     DATA VGTCF2 / MemFac* 7.95859E-04, MemFac* 3.72064E-04,
1198     3 MemFac*-7.65944E-05, MemFac* 8.24060E-04,
1199     5 MemFac* 1.57617E-03, MemFac* 8.44847E-05,
1200     7 MemFac* 0., MemFac* 0.,
1201     9 MemFac* 0. , MemFac* 0./
1202     DATA VGTCF3 / MemFac*-1.11575E-01, MemFac*-5.21533E-02,
1203     3 MemFac* 6.14960E-03, MemFac*-1.19602E-01,
1204     5 MemFac*-2.26109E-01, MemFac*-1.27272E-02,
1205     7 MemFac* 0., MemFac* 0.,
1206     9 MemFac* 0. , MemFac* 0./
1207     C****
1208     C**** ----------------------------------------------------------------
1209    
1210     DO 100 ChNo = 1, NCH
1211     C****
1212     TypPtr = MOD(ChNo,MemFac) + (ITYP(ChNo)-1)*MemFac + 1
1213     FTEMP(ChNo) = (TC(ChNo) - VGTLL(TypPtr)) *
1214     & (TC(ChNo) - VGTU(TypPtr)) *
1215     & ( VGTCF1(TypPtr)*TC(ChNo)*TC(ChNo) +
1216     & VGTCF2(TypPtr)*TC(ChNo) +
1217     & VGTCF3(TypPtr) )
1218     IF ( TC(ChNo) .LE. VGTLL(TypPtr) .OR. TC(ChNo) .GE. VGTU(TypPtr) )
1219     & FTEMP (ChNo) = 1.E-10
1220 ce107 1.6 FTEMP(CHNO) = MIN( 1. _d 0, MAX( FTEMP(ChNo), 1. _d -10 ) )
1221 molod 1.1 C****
1222     100 CONTINUE
1223     C****
1224     RETURN
1225     END
1226     C****
1227     C**** [ END TMPFAC ]
1228     C****
1229     C**** -----------------------------------------------------------------
1230     C**** /////////////////////////////////////////////////////////////////
1231     C**** -----------------------------------------------------------------
1232     C****
1233     C**** [ BEGIN SMFAC ]
1234     C****
1235     SUBROUTINE SMFAC (
1236     I NCH, ITYP, ESATTC, EA, PHR, SOILCO,
1237     I RCUN, VPDSTR, FTEMP, TC, PSUR, Z2,
1238     I RSOIL1, RSOIL2, VGPH1X, VGPH2X, VGRPLX,
1239     O RC
1240     & )
1241     C****
1242     C**** This subroutine estimates RC after computing the
1243     C**** leaf water potential stress.
1244     C****
1245     IMPLICIT NONE
1246     C****
1247 molod 1.2 #include "sibber.h"
1248 molod 1.1 C****
1249     INTEGER NCH
1250     INTEGER ITYP(NCH), ChNo
1251 molod 1.4 _RL ESATTC(NCH), EA(NCH), PHR(NCH), SOILCO(NCH),
1252 molod 1.1 & RCUN(NCH), VPDSTR(NCH), FTEMP(NCH), TC(NCH),
1253     & PSUR(NCH), Z2(NCH), RSOIL1(NCH), RSOIL2(NCH),
1254     & VGPH1X(NCH), VGPH2X(NCH), VGRPLX(NCH), RC(NCH)
1255 molod 1.4 _RL RCUNTD, RHOAIR, CONST, DEF, D12, DR2,
1256 molod 1.1 & RSOIL, R0, EEST, RSTFAC
1257     C****
1258     C**** -----------------------------------------------------------------
1259    
1260     DO 100 ChNo = 1, NCH
1261     C****
1262     RCUNTD = RCUN(ChNo) / ( VPDSTR(ChNo)*FTEMP(ChNo) )
1263     RHOAIR = PSUR(ChNo) * 100. / ( RGAS*TC(ChNo) )
1264    
1265     C****
1266     CONST = RHOAIR * EPSILON / PSUR(ChNo)
1267     DEF = ( ESATTC(ChNo) - EA(ChNo) ) * CONST
1268     D12 = VGPH1X(ChNo) - VGPH2X(ChNo)
1269     DR2 = PHR(ChNo) - Z2(ChNo) - VGPH2X(ChNo)
1270     RSOIL = RSOIL1(ChNo) + RSOIL2(ChNo)/SOILCO(ChNo)
1271     R0 = ( VGRPLX(ChNo) + RSOIL ) / RHOW
1272     EEST = DEF*DR2 / ( RCUNTD*D12 + DEF*R0 )
1273     RSTFAC = ( DR2 - R0*EEST ) / D12
1274 ce107 1.6 RSTFAC = MIN( 1. _d 0, MAX( 0.001 _d 0, RSTFAC ) )
1275 molod 1.1 RC(ChNo) = RCUNTD / RSTFAC
1276     C****
1277     100 CONTINUE
1278     C****
1279     RETURN
1280     END
1281     C****
1282     C**** [ END SMFAC ]
1283     C****
1284     C**** -----------------------------------------------------------------
1285     C**** /////////////////////////////////////////////////////////////////
1286     C**** -----------------------------------------------------------------
1287     C****
1288     C**** [ BEGIN RSURFP ]
1289     C****
1290     SUBROUTINE RSURFP (
1291     I NCH, UM, U2FAC, Z2, RDC, WET, ESATTC, EA,
1292     U RC,
1293     O RX1, RX2
1294     & )
1295     C****
1296     IMPLICIT NONE
1297     INTEGER NCH
1298     INTEGER ChNo
1299 molod 1.4 _RL UM(NCH), U2FAC(NCH), Z2(NCH), RDC(NCH),
1300 molod 1.1 & WET(NCH), ESATTC(NCH), EA(NCH),
1301     & RC(NCH), RX1(NCH), RX2(NCH)
1302 molod 1.4 _RL U2, RSURF, HESAT
1303 molod 1.1 C****
1304     C**** -----------------------------------------------------------------
1305    
1306     DO 100 ChNo = 1, NCH
1307     C****
1308     U2 = UM(ChNo) * U2FAC(ChNo)
1309     c RSURF = RDC(ChNo) / U2 + 30. / (1.E-20 + WET(ChNo))
1310     RSURF = RDC(ChNo) / U2 + 26. + 6. / (1.E-20 + WET(ChNo))**2
1311    
1312     C**** Account for subsaturated humidity at soil surface:
1313     C****
1314 ce107 1.6 HESAT = ESATTC(CHNO) * MIN( 1. _d 0, WET(CHNO)*2. _d 0)
1315 molod 1.1 IF( EA(CHNO) .LT. HESAT ) THEN
1316     RSURF=RSURF*( 1. + (ESATTC(CHNO)-HESAT)/(HESAT-EA(CHNO)) )
1317     ELSE
1318     RSURF=1.E10
1319     ENDIF
1320    
1321    
1322     RX1(CHNO)=RC(CHNO)
1323     RX2(CHNO)=RSURF
1324    
1325     RC(ChNo) = RC(CHNO) * RSURF / ( RC(ChNo) + RSURF )
1326     C****
1327     100 CONTINUE
1328     C****
1329     RETURN
1330     END
1331     C****
1332     C**** [ END RSURFP ]
1333     C****
1334     C**** -----------------------------------------------------------------
1335     C**** /////////////////////////////////////////////////////////////////
1336     C**** -----------------------------------------------------------------
1337     C****
1338     C**** [ BEGIN RCANOP ]
1339     C****
1340     SUBROUTINE RCANOP (
1341     I NCH, CAPAC, SNOW, SATCAP, RA, ETURB, SNWFRC,
1342     I POTFRC,
1343     U RC
1344     & )
1345     C****
1346     C**** The effective latent heat resistance RC depends on the quantity
1347     C**** of interception reservoir water and the snow cover. POTFRC
1348     C**** is the fraction of the tile from which potential evaporation
1349     C**** occurs.
1350     C****
1351     IMPLICIT NONE
1352     INTEGER NCH
1353     INTEGER ChNo
1354 molod 1.4 _RL CAPAC(NCH), SNOW(NCH), SATCAP(NCH), RA(NCH), ETURB(NCH),
1355 molod 1.1 & RC(NCH), SNWFRC(NCH), POTFRC(NCH)
1356 molod 1.4 _RL ETCRIT,RAMPFC
1357 molod 1.1
1358     C**** (Note: ETCRIT arbitrarily set to ~-5 W/m2, or -2.e-6 mm/sec.)
1359     DATA ETCRIT/ -2.E-6 /
1360     C****
1361     C**** -----------------------------------------------------------------
1362    
1363     DO 100 ChNo = 1, NCH
1364    
1365     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1366     C**** Case 1: Vegetation present (SATCAP GT .001). Potential evap. from
1367     c**** both interception reservoir and snow.
1368    
1369     IF(SATCAP(CHNO).GT..001) THEN
1370     RC(ChNo)=RC(ChNo)*(1.-POTFRC(CHNO))/
1371     & ( 1.+POTFRC(CHNO)*RC(ChNo)/RA(ChNo) )
1372     ENDIF
1373    
1374     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1375     C**** Case 2: Vegetation absent (SATCAP LE .001). Potential evap. from
1376     c**** snow only.
1377    
1378     IF(SATCAP(CHNO) .LE. .001) THEN
1379     RC(ChNo)=RC(ChNo)*(1.-SNWFRC(CHNO))/
1380     & ( 1.+SNWFRC(CHNO)*RC(ChNo)/RA(ChNo) )
1381     ENDIF
1382    
1383     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1384     C**** Assume RC=0 for condensation (dew).
1385     C**** RAMPFC is used to ensure continuity in RC.
1386    
1387     RAMPFC=ETURB(CHNO)/ETCRIT
1388     IF ( RAMPFC .GE. 0. ) RC(CHNO) = RC(CHNO)*(1.-RAMPFC)
1389     IF ( RAMPFC .GT. 1. ) RC(ChNo) = 0.
1390     C****
1391     100 CONTINUE
1392     C****
1393     RETURN
1394     END
1395     C****
1396     C**** [ END RCANOP ]
1397     C****
1398     C**** -----------------------------------------------------------------
1399     C**** /////////////////////////////////////////////////////////////////
1400     C**** -----------------------------------------------------------------
1401     C****
1402     C***** [ BEGIN WUPDAT ]
1403     C****
1404     SUBROUTINE WUPDAT (
1405     I NCH, ITYP, DTSTEP,
1406     I EVAP, SATCAP, VGWMAX, TC, RA, RC,
1407     I RX1, RX2,ESNFRC,EIRFRC,
1408     U CAPAC, SNOW, SWET, RUNOFF,
1409     O EINT, ESOI, EVEG, ESNO, RUNSRF, FWSOIL
1410     & )
1411     C****
1412     C**** This subroutine allows evapotranspiration to adjust the water
1413     C**** contents of the interception reservoir and the soil layers.
1414     C****
1415     IMPLICIT NONE
1416     C****
1417 molod 1.2 #include "sibber.h"
1418 molod 1.1 C****
1419     INTEGER NCH
1420     INTEGER ITYP(NCH), ChNo
1421 molod 1.4 _RL EVAP(NCH), SATCAP(NCH), VGWMAX(NLAY,NTYPS),
1422 molod 1.1 & TC(NCH), RA(NCH), RC(NCH),
1423     & CAPAC(NCH), SNOW(NCH), SWET(nch,NLAY),
1424     & RUNOFF(NCH), RX1(NCH),
1425     & RX2(NCH), RUNSRF(NCH), FWSOIL(NCH),
1426     & ESNFRC(NCH), EIRFRC(NCH)
1427 molod 1.4 _RL EINT(NCH), ESOI(NCH), EVEG(NCH), ESNO(NCH)
1428     _RL DTSTEP, EGRO, FWS, THRU, DEWRUN,
1429 molod 1.1 & WTOTAL,WLAY1,WLAY2,ELAY1,ELAY2,EGROI
1430     C****
1431     C**** -----------------------------------------------------------------
1432    
1433     DO 100 ChNo = 1, NCH
1434     C****
1435     C**** Partition evap between interception, snow, and ground reservoirs.
1436     C****
1437     WLAY1 = SWET(ChNo,SFCLY) * VGWMAX(SFCLY,ITYP(ChNo))
1438     WLAY2 = SWET(ChNo,ROOTLY) * VGWMAX(ROOTLY,ITYP(ChNo))
1439     WTOTAL = WLAY1 + WLAY2
1440     C****
1441     ESNO(CHNO)=ESNFRC(CHNO)*EVAP(CHNO)*DTSTEP
1442     EINT(CHNO)=EIRFRC(CHNO)*EVAP(CHNO)*DTSTEP
1443     EGRO = EVAP(CHNO)*DTSTEP - ESNO(CHNO) - EINT(CHNO)
1444    
1445     C**** Ensure that individual capacities are not exceeded.
1446    
1447     IF(ESNO(CHNO) .GT. SNOW(CHNO)) THEN
1448     EINT(CHNO)=EINT(CHNO)+(ESNO(CHNO)-SNOW(CHNO))
1449     ESNO(CHNO)=SNOW(CHNO)
1450     ENDIF
1451     EGROI=EGRO+EINT(CHNO)
1452     IF(EGROI .GT. CAPAC(CHNO)+WTOTAL) THEN
1453     ESNO(CHNO)=ESNO(CHNO)+EGROI-(CAPAC(CHNO)+WTOTAL)
1454     EGROI=CAPAC(CHNO)+WTOTAL
1455     ENDIF
1456    
1457     EINT(CHNO)=EGROI-EGRO
1458     IF(EINT(CHNO) .GT. CAPAC(CHNO)) THEN
1459     EGRO=EGRO+EINT(CHNO)-CAPAC(CHNO)
1460     EINT(CHNO)=CAPAC(CHNO)
1461     ENDIF
1462     IF(EGRO .GT. WTOTAL) THEN
1463     EINT(CHNO)=EINT(CHNO)+EGRO-WTOTAL
1464     EGRO=WTOTAL
1465     ENDIF
1466     C****
1467     C**** Separate egro into surface-evaporation/transpiration components:
1468     C****
1469     IF( RX1(CHNO)+RX2(CHNO) .NE. 0. ) THEN
1470     ESOI(CHNO)=EGRO*RX1(CHNO)/(RX1(CHNO)+RX2(CHNO))
1471     EVEG(CHNO)=EGRO - ESOI(CHNO)
1472     ELSE
1473     ESOI(CHNO)=EGRO/2.
1474     EVEG(CHNO)=EGRO/2.
1475     ENDIF
1476     C****
1477     C**** Translate ESOI and EVEG into evaporation fluxes from layers 1 and 2:
1478     C****
1479     IF( WTOTAL .GT. 0. ) THEN
1480     FWS = EVEG(CHNO) / WTOTAL
1481     ELSE
1482     FWS = 1.
1483     ENDIF
1484     ELAY1 = WLAY1*FWS + ESOI(CHNO)
1485     ELAY2 = WLAY2*FWS
1486     C****
1487     C**** Ensure that enough soil water is available in each layer:
1488     C****
1489     IF( ELAY1 .GT. WLAY1 ) THEN
1490     ELAY2 = ELAY2 + (ELAY1 - WLAY1)
1491     ELAY1 = WLAY1
1492     ENDIF
1493     IF( ELAY2 .GT. WLAY2 ) THEN
1494     ELAY1 = ELAY1 + (ELAY2 - WLAY2)
1495     ELAY2 = WLAY2
1496     ENDIF
1497    
1498     C**** Special case for condensation:
1499     IF(EVAP(CHNO) .LT. 0.) THEN
1500     EINT(CHNO)=(1.-ESNFRC(CHNO))*EVAP(CHNO)*DTSTEP
1501     ELAY1=0.
1502     ELAY2=0.
1503     ESOI(CHNO)=0.
1504     EVEG(CHNO)=0.
1505     ESNO(CHNO)=ESNFRC(CHNO)*EVAP(CHNO)*DTSTEP
1506     ENDIF
1507    
1508     C****
1509     C**** Remove moisture from reservoirs:
1510     C****
1511     SNOW(ChNo) = SNOW(ChNo) - ESNO(CHNO)
1512     CAPAC(ChNo) = CAPAC(ChNo) - EINT(CHNO)
1513     SWET(ChNo,SFCLY) = (WLAY1 - ELAY1) / VGWMAX(SFCLY,ITYP(ChNo))
1514     SWET(ChNo,ROOTLY) = (WLAY2 - ELAY2) / VGWMAX(ROOTLY,ITYP(CHNO))
1515     C****
1516     C**** Ensure against numerical precision problems:
1517 ce107 1.6 SWET(ChNo,SFCLY) = MIN( 1. _d 0, MAX( 0. _d 0, SWET(ChNo,SFCLY) ) )
1518     SWET(ChNo,ROOTLY) = MIN( 1. _d 0, MAX( 0. _d 0, SWET(ChNo,ROOTLY) ) )
1519 molod 1.1 C****
1520     C****
1521     C**** -------------------------------------------------
1522     C**** DEWFALL:
1523     C****
1524     C**** If dewfall adds to cir, insure that it doesn't fill
1525     C**** beyond capacity. If resulting throughfall adds to top soil layer,
1526     C**** insure that it also doesn't fill beyond capacity.
1527     C****
1528     IF( CAPAC(ChNo) .GT. SATCAP(ChNo) ) THEN
1529     THRU = CAPAC(ChNo) - SATCAP(ChNo)
1530     CAPAC(ChNo) = SATCAP(ChNo)
1531     SWET(ChNo,SFCLY) = SWET(ChNo,SFCLY) +
1532     & THRU / VGWMAX(SFCLY,ITYP(ChNo))
1533     DEWRUN=0.
1534     IF ( SWET(ChNo,SFCLY) .GT. 1. ) THEN
1535     DEWRUN = ( SWET(ChNo,SFCLY) - 1. ) * VGWMAX(SFCLY,ITYP(ChNo))
1536     SWET(ChNo,SFCLY) = 1.
1537     RUNOFF(ChNo) = RUNOFF(ChNo) + DEWRUN/DTSTEP
1538     RUNSRF(ChNo) = RUNSRF(ChNo) + DEWRUN/DTSTEP
1539     ENDIF
1540     FWSOIL(CHNO) = FWSOIL(CHNO) + (THRU-DEWRUN)/DTSTEP
1541     ENDIF
1542     C****
1543     100 CONTINUE
1544     C****
1545     RETURN
1546     END
1547     C****
1548     C**** [ END WUPDAT ]
1549     C****
1550     C**** -----------------------------------------------------------------
1551     C**** /////////////////////////////////////////////////////////////////
1552     C**** -----------------------------------------------------------------
1553     C****
1554     C**** [ BEGIN GWATER ]
1555     C****
1556     SUBROUTINE GWATER (
1557     I NCH, ITYP, WSMAX, PHLAY, AKLAY, TC,
1558     I DTSTEP, VGZDEX, VGSLOX, WETEQ1, WETEQ2,
1559     I PHSAT, AKSAT,
1560     U SWET, RUNOFF, GDRAIN
1561     & )
1562     C****
1563     C**** This subroutine computes diffusion between soil layers.
1564     C****
1565     IMPLICIT NONE
1566     C****
1567 molod 1.2 #include "sibber.h"
1568 molod 1.1 C****
1569     INTEGER NCH
1570     INTEGER ITYP(NCH), ChNo
1571 molod 1.4 _RL VGSLOX(NCH), RUNOFF(NCH), GDRAIN(NCH)
1572     _RL ZDEP12, AKAVE, GWFLUX, ZDEP23, HALFMX, DHDZ,
1573 molod 1.1 & FAREA, TFM2, FRAMP
1574    
1575 molod 1.4 _RL WSMAX(NLAY,NTYPS), PHLAY(nch,NLAY),
1576 molod 1.1 & AKLAY(nch,NLAY), TC(NCH),
1577     & DTSTEP, SWET(nch,NLAY),
1578     & VGZDEX(NLAY,nch), WETEQ1(NCH), WETEQ2(NCH),
1579     & PHSAT(NCH), AKSAT(NCH)
1580    
1581     C****
1582     C**** ----------------------------------------------------------------
1583    
1584     DO 100 ChNo = 1, NCH
1585     C****
1586     C**** Diffusion between layer 1 and 2:
1587     ZDEP12 = VGZDEX(SFCLY,ChNo) + VGZDEX(ROOTLY,ChNo)
1588     IF( SWET(CHNO,SFCLY) .GT. WETEQ1(CHNO) ) THEN
1589     FAREA=(SWET(CHNO,SFCLY) - WETEQ1(CHNO)) / (1. - WETEQ1(CHNO))
1590     DHDZ = 1. + 2.*(PHSAT(CHNO)-PHLAY(CHNO,ROOTLY))/ZDEP12
1591     AKAVE = AKSAT(CHNO)
1592     ELSE
1593     FAREA = 1.
1594     DHDZ = 1. + 2.*(PHLAY(ChNo,SFCLY)-PHLAY(ChNo,ROOTLY))/ZDEP12
1595     AKAVE = AKLAY(ChNo,ROOTLY)
1596     ENDIF
1597     C****
1598     GWFLUX = 1000. * DTSTEP * AKAVE * DHDZ * FAREA
1599     C****
1600     C**** Test for limits on water holding capacity.
1601     C****
1602     HALFMX=0.5*ABS( SWET(CHNO,SFCLY)-WETEQ1(CHNO) )
1603     & * WSMAX(SFCLY,ITYP(CHNO))
1604     IF (GWFLUX .GE. 0.) THEN
1605     GWFLUX = MIN( GWFLUX,
1606     & SWET(ChNo,SFCLY) * WSMAX(SFCLY,ITYP(ChNo)) )
1607     GWFLUX = MIN( GWFLUX, WSMAX(ROOTLY,ITYP(ChNo)) -
1608     & SWET(ChNo,ROOTLY) * WSMAX(ROOTLY,ITYP(ChNo)) )
1609     GWFLUX = MIN( GWFLUX, HALFMX )
1610     ELSE
1611     GWFLUX = -MIN( ABS(GWFLUX),
1612     & SWET(ChNo,ROOTLY) * WSMAX(ROOTLY,ITYP(ChNo)) )
1613     GWFLUX = -MIN( ABS(GWFLUX), WSMAX(SFCLY,ITYP(ChNo)) -
1614     & SWET(ChNo,SFCLY) * WSMAX(SFCLY,ITYP(ChNo)) )
1615     GWFLUX = -MIN( ABS(GWFLUX), HALFMX )
1616     ENDIF
1617     C****
1618     C**** Prevent diffusion when ground is frozen (INCLUDE RAMPING):
1619     TFM2=TF-2.
1620     FRAMP=(TC(CHNO)-TFM2)/2.
1621 ce107 1.6 FRAMP=MIN(1. _d 0, MAX(0. _d 0,FRAMP) )
1622 molod 1.1 GWFLUX=GWFLUX*FRAMP
1623     C****
1624     C**** Update water contents
1625     SWET(ChNo,SFCLY) = SWET(ChNo,SFCLY) -
1626     & GWFLUX / WSMAX(SFCLY,ITYP(ChNo))
1627     SWET(ChNo,ROOTLY) = SWET(ChNo,ROOTLY) +
1628     & GWFLUX / WSMAX(ROOTLY,ITYP(ChNo))
1629     C****
1630     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1631     C**** Diffusion between root and recharge layers:
1632     ZDEP23 = VGZDEX(ROOTLY,ChNo) + VGZDEX(RECHLY,ChNo)
1633     DHDZ=1. + 2. * (PHLAY(ChNo,ROOTLY) - PHLAY(ChNo,RECHLY)) / ZDEP23
1634     IF(DHDZ.GE.0.) THEN
1635     AKAVE = AKLAY(ChNo,ROOTLY)
1636     ELSE
1637     AKAVE = AKLAY(ChNo,RECHLY)
1638     ENDIF
1639     GWFLUX = 1000. * DTSTEP * AKAVE * DHDZ
1640     C****
1641     C**** Test for limits on water holding capacity:
1642     HALFMX=0.5*ABS( SWET(CHNO,ROOTLY)-WETEQ2(CHNO) )
1643     & * WSMAX(ROOTLY,ITYP(CHNO))
1644     IF (GWFLUX .GE. 0.) THEN
1645     GWFLUX = MIN( GWFLUX,
1646     & SWET(ChNo,ROOTLY) * WSMAX(ROOTLY,ITYP(ChNo)) )
1647     GWFLUX = MIN( GWFLUX, WSMAX(RECHLY,ITYP(ChNo)) -
1648     & SWET(ChNo,RECHLY) * WSMAX(RECHLY,ITYP(ChNo)) )
1649     GWFLUX = MIN( GWFLUX, HALFMX )
1650     ELSE
1651     GWFLUX = -MIN( ABS(GWFLUX),
1652     & SWET(ChNo,RECHLY) * WSMAX(RECHLY,ITYP(ChNo)) )
1653     GWFLUX = -MIN( ABS(GWFLUX), WSMAX(ROOTLY,ITYP(ChNo)) -
1654     & SWET(ChNo,ROOTLY) * WSMAX(ROOTLY,ITYP(ChNo)) )
1655     GWFLUX = -MIN( ABS(GWFLUX), HALFMX )
1656     ENDIF
1657     C****
1658     C**** Prevent diffusion when ground is frozen (INCLUDE RAMPING):
1659     FRAMP=(TC(CHNO)-TFM2)/2.
1660 ce107 1.6 FRAMP=MIN(1. _d 0, MAX(0. _d 0,FRAMP) )
1661 molod 1.1 GWFLUX=GWFLUX*FRAMP
1662     C****
1663     C**** Update water contents
1664     SWET(ChNo,ROOTLY) = SWET(ChNo,ROOTLY) -
1665     & GWFLUX / WSMAX(ROOTLY,ITYP(ChNo))
1666     SWET(ChNo,RECHLY) = SWET(ChNo,RECHLY) +
1667     & GWFLUX / WSMAX(RECHLY,ITYP(ChNo))
1668     GDRAIN(CHNO)=GWFLUX/DTSTEP
1669     C****
1670     C**** - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1671     C**** Flux of moisture out of lower soil layer to water table
1672     C**** (approximation to SiB)
1673     C****
1674     GWFLUX = VGSLOX(ChNo) * AKLAY(ChNo,RECHLY) * 1000. * DTSTEP
1675    
1676     C**** Prevent diffusion when ground is frozen (INCLUDE RAMPING):
1677     FRAMP=(TC(CHNO)-TFM2)/2.
1678 ce107 1.6 FRAMP=MIN(1. _d 0, MAX(0. _d 0,FRAMP) )
1679 molod 1.1 GWFLUX=GWFLUX*FRAMP
1680    
1681     GWFLUX = MIN( GWFLUX,
1682     & SWET(ChNo,RECHLY) * WSMAX(RECHLY,ITYP(ChNo)) )
1683     SWET(ChNo,RECHLY) = SWET(ChNo,RECHLY) -
1684     & GWFLUX / WSMAX(RECHLY,ITYP(ChNo))
1685     C****
1686     RUNOFF (ChNo) = RUNOFF (ChNo) + GWFLUX/DTSTEP
1687     C****
1688     100 CONTINUE
1689     C****
1690     RETURN
1691     END
1692     C****
1693     C**** [ END GWATER ]
1694    
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