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module_sf_pxsfclay.F @ 3431

Last change on this file since 3431 was 2759, checked in by aslmd, 2 years ago
adding unmodified code from WRFV3.0.1.1, expurged from useless data +1M size
Property svn:executable set to ``*
File size: 25.2 KB

Line
1	!WRF:MODEL_LAYER:PHYSICS
2	!
3	MODULE module_sf_pxsfclay
4
5	REAL , PARAMETER :: RICRIT = 0.25 !critical Richardson number
6	REAL , PARAMETER :: BETAH = 5.0 ! 8.21
7	REAL , PARAMETER :: BETAM = 5.0 ! 6.0
8	REAL , PARAMETER :: BM = 13.0
9	REAL , PARAMETER :: BH = 15.7
10	REAL , PARAMETER :: GAMAM = 19.3
11	REAL , PARAMETER :: GAMAH = 11.6
12	REAL , PARAMETER :: PR0 = 0.95
13	REAL , PARAMETER :: CZO = 0.032
14	REAL , PARAMETER :: OZO = 1.E-4
15	REAL , PARAMETER :: VCONVC = 1.0
16
17
18	CONTAINS
19
20	!-------------------------------------------------------------------
21	SUBROUTINE PXSFCLAY(U3D,V3D,T3D,TH3D,QV3D,P3D,dz8w, &
22	CP,G,ROVCP,R,XLV,PSFC,CHS,CHS2,CQS2,CPM, &
23	ZNT,UST,PBLH,MAVAIL,ZOL,MOL,REGIME,PSIM,PSIH, &
24	XLAND,HFX,QFX,LH,TSK,FLHC,FLQC,QGH,QSFC,RMOL, &
25	U10,V10, &
26	GZ1OZ0,WSPD,BR,ISFFLX,DX, &
27	SVP1,SVP2,SVP3,SVPT0,EP1,EP2,KARMAN, &
28	ids,ide, jds,jde, kds,kde, &
29	ims,ime, jms,jme, kms,kme, &
30	its,ite, jts,jte, kts,kte )
31	!-------------------------------------------------------------------
32	IMPLICIT NONE
33	!-------------------------------------------------------------------
34	! THIS MODULE COMPUTES SFC RELATED PARAMETERS (U*, RA, REGIME, etc.)
35	! USING A MODIFIED RICHARDSON NUMBER PARAMETERIZATIONS.
36	!
37	! THE PARAMETERIZATIONS OF THE PSI FUNCTIONS FOR UNSTABLE CONDITIONS
38	! HAVE BEEN REPLACED WITH EMPIRICAL EXPRESSIONS WHICH RELATE RB DIRECTLY
39	! TO PSIH AND PSIM. THESE EXPRESSIONS ARE FIT TO THE DYER (1974) FUNCTIONS
40	! WITH HOGSTROM (1988) REVISED COEFFICIENTS. ALSO, THESE EXPERESSIONS
41	! ASSUME A LAMINAR SUBLAYER RESISTANCE FOR HEAT (Rb = 5/U*) - JP 8/01
42	!
43	! Reference: Pleim (2006): JAMC, 45, 341-347
44	!
45	! REVISION HISTORY:
46	! A. Xiu 2/2005 - developed WRF version based on the MM5 PX LSM
47	! R. Gilliam 7/2006 - completed implementation into WRF model
48	!***********************************************************************
49	!-------------------------------------------------------------------
50	!-- U3D 3D u-velocity interpolated to theta points (m/s)
51	!-- V3D 3D v-velocity interpolated to theta points (m/s)
52	!-- T3D temperature (K)
53	!-- TH3D potential temperature (K)
54	!-- QV3D 3D water vapor mixing ratio (Kg/Kg)
55	!-- P3D 3D pressure (Pa)
56	!-- dz8w dz between full levels (m)
57	!-- CP heat capacity at constant pressure for dry air (J/kg/K)
58	!-- G acceleration due to gravity (m/s^2)
59	!-- ROVCP R/CP
60	!-- R gas constant for dry air (j/kg/k)
61	!-- XLV latent heat of vaporization (j/kg)
62	!-- PSFC surface pressure (Pa)
63	!-- CHS exchange coefficient for heat (m/s)
64	!-- CHS2 exchange coefficient for heat at 2 m (m/s)
65	!-- CQS2 exchange coefficient for moisture at 2 m (m/s)
66	!-- CPM heat capacity at constant pressure for moist air (J/kg/K)
67	!-- ZNT roughness length (m)
68	!-- UST u* in similarity theory (m/s)
69	!-- PBLH PBL height from previous time (m)
70	!-- MAVAIL surface moisture availability (between 0 and 1)
71	!-- ZOL z/L height over Monin-Obukhov length
72	!-- MOL T* (similarity theory) (K)
73	!-- REGIME flag indicating PBL regime (stable, unstable, etc.)
74	!-- PSIM similarity stability function for momentum
75	!-- PSIH similarity stability function for heat
76	!-- XLAND land mask (1 for land, 2 for water)
77	!-- HFX upward heat flux at the surface (W/m^2)
78	!-- QFX upward moisture flux at the surface (kg/m^2/s)
79	!-- LH net upward latent heat flux at surface (W/m^2)
80	!-- TSK surface temperature (K)
81	!-- FLHC exchange coefficient for heat (m/s)
82	!-- FLQC exchange coefficient for moisture (m/s)
83	!-- QGH lowest-level saturated mixing ratio
84	!-- QSFC SPECIFIC HUMIDITY AT LOWER BOUNDARY
85	!-- RMOL inverse Monin-Obukhov length (1/m)
86	!-- U10 diagnostic 10m u wind
87	!-- V10 diagnostic 10m v wind
88	!-- GZ1OZ0 log(z/z0) where z0 is roughness length
89	!-- WSPD wind speed at lowest model level (m/s)
90	!-- BR bulk Richardson number in surface layer
91	!-- ISFFLX isfflx=1 for surface heat and moisture fluxes
92	!-- DX horizontal grid size (m)
93	!-- SVP1 constant for saturation vapor pressure (kPa)
94	!-- SVP2 constant for saturation vapor pressure (dimensionless)
95	!-- SVP3 constant for saturation vapor pressure (K)
96	!-- SVPT0 constant for saturation vapor pressure (K)
97	!-- EP1 constant for virtual temperature (R_v/R_d - 1) (dimensionless)
98	!-- EP2 constant for specific humidity calculation
99	! (R_d/R_v) (dimensionless)
100	!-- KARMAN Von Karman constant
101	!-- ids start index for i in domain
102	!-- ide end index for i in domain
103	!-- jds start index for j in domain
104	!-- jde end index for j in domain
105	!-- kds start index for k in domain
106	!-- kde end index for k in domain
107	!-- ims start index for i in memory
108	!-- ime end index for i in memory
109	!-- jms start index for j in memory
110	!-- jme end index for j in memory
111	!-- kms start index for k in memory
112	!-- kme end index for k in memory
113	!-- its start index for i in tile
114	!-- ite end index for i in tile
115	!-- jts start index for j in tile
116	!-- jte end index for j in tile
117	!-- kts start index for k in tile
118	!-- kte end index for k in tile
119	!-------------------------------------------------------------------
120	INTEGER, INTENT(IN ) :: ids,ide, jds,jde, kds,kde, &
121	ims,ime, jms,jme, kms,kme, &
122	its,ite, jts,jte, kts,kte
123	!
124	INTEGER, INTENT(IN ) :: ISFFLX
125	REAL, INTENT(IN ) :: SVP1,SVP2,SVP3,SVPT0
126	REAL, INTENT(IN ) :: EP1,EP2,KARMAN
127	!
128	REAL, DIMENSION( ims:ime, kms:kme, jms:jme ) , &
129	INTENT(IN ) :: dz8w
130
131	REAL, DIMENSION( ims:ime, kms:kme, jms:jme ) , &
132	INTENT(IN ) :: QV3D, &
133	P3D, &
134	T3D, &
135	TH3D
136
137	REAL, DIMENSION( ims:ime, jms:jme ) , &
138	INTENT(IN ) :: MAVAIL, &
139	PBLH, &
140	XLAND, &
141	TSK
142	REAL, DIMENSION( ims:ime, jms:jme ) , &
143	INTENT(OUT ) :: U10, &
144	V10, &
145	QSFC
146	!
147	REAL, DIMENSION( ims:ime, jms:jme ) , &
148	INTENT(INOUT) :: REGIME, &
149	HFX, &
150	QFX, &
151	LH, &
152	MOL,RMOL
153	!m the following 5 are change to memory size
154	!
155	REAL, DIMENSION( ims:ime, jms:jme ) , &
156	INTENT(INOUT) :: GZ1OZ0,WSPD,BR, &
157	PSIM,PSIH
158
159	REAL, DIMENSION( ims:ime, kms:kme, jms:jme ) , &
160	INTENT(IN ) :: U3D, &
161	V3D
162
163	REAL, DIMENSION( ims:ime, jms:jme ) , &
164	INTENT(IN ) :: PSFC
165
166	REAL, DIMENSION( ims:ime, jms:jme ) , &
167	INTENT(INOUT) :: ZNT, &
168	ZOL, &
169	UST, &
170	CPM, &
171	CHS2, &
172	CQS2, &
173	CHS
174
175	REAL, DIMENSION( ims:ime, jms:jme ) , &
176	INTENT(INOUT) :: FLHC,FLQC
177
178	REAL, DIMENSION( ims:ime, jms:jme ) , &
179	INTENT(INOUT) :: &
180	QGH
181
182
183
184	REAL, INTENT(IN ) :: CP,G,ROVCP,R,XLV,DX
185
186	! LOCAL VARS
187
188	REAL, DIMENSION( its:ite ) :: U1D, &
189	V1D, &
190	QV1D, &
191	P1D, &
192	T1D, &
193	TH1D
194
195	REAL, DIMENSION( its:ite ) :: dz8w1d
196
197	INTEGER :: I,J
198
199	DO J=jts,jte
200	DO i=its,ite
201	dz8w1d(I) = dz8w(i,1,j)
202	ENDDO
203
204	DO i=its,ite
205	U1D(i) =U3D(i,1,j)
206	V1D(i) =V3D(i,1,j)
207	QV1D(i)=QV3D(i,1,j)
208	P1D(i) =P3D(i,1,j)
209	T1D(i) =T3D(i,1,j)
210	TH1D(i) =TH3D(i,1,j)
211	ENDDO
212
213
214	! TST, WST, MOLENGTH, USTM need to be recaculated or passed in
215
216	CALL PXSFCLAY1D(J,U1D,V1D,T1D,TH1D,QV1D,P1D,dz8w1d, &
217	CP,G,ROVCP,R,XLV,PSFC(ims,j),CHS(ims,j),CHS2(ims,j), &
218	CQS2(ims,j),CPM(ims,j),PBLH(ims,j), RMOL(ims,j), &
219	ZNT(ims,j),UST(ims,j),MAVAIL(ims,j),ZOL(ims,j), &
220	MOL(ims,j),REGIME(ims,j),PSIM(ims,j),PSIH(ims,j), &
221	XLAND(ims,j),HFX(ims,j),QFX(ims,j),TSK(ims,j), &
222	U10(ims,j),V10(ims,j), &
223	FLHC(ims,j),FLQC(ims,j),QGH(ims,j), &
224	QSFC(ims,j),LH(ims,j), &
225	GZ1OZ0(ims,j),WSPD(ims,j),BR(ims,j),ISFFLX,DX, &
226	SVP1,SVP2,SVP3,SVPT0,EP1,EP2,KARMAN, &
227	ids,ide, jds,jde, kds,kde, &
228	ims,ime, jms,jme, kms,kme, &
229	its,ite, jts,jte, kts,kte )
230	ENDDO
231
232
233	END SUBROUTINE PXSFCLAY
234	!====================================================================
235	SUBROUTINE PXSFCLAY1D(J,US,VS,T1D,THETA1,QV1D,P1D,dz8w1d, &
236	CP,G,ROVCP,R,XLV,PSFCPA,CHS,CHS2,CQS2,CPM,PBLH,RMOL, &
237	ZNT,UST,MAVAIL,ZOL,MOL,REGIME,PSIM,PSIH, &
238	XLAND,HFX,QFX,TG, &
239	U10,V10,FLHC,FLQC,QGH, &
240	QSFC,LH,GZ1OZ0,WSPD,BR,ISFFLX,DX, &
241	SVP1,SVP2,SVP3,SVPT0,EP1,EP2,KARMAN, &
242	ids,ide, jds,jde, kds,kde, &
243	ims,ime, jms,jme, kms,kme, &
244	its,ite, jts,jte, kts,kte )
245	!-------------------------------------------------------------------
246	IMPLICIT NONE
247	!-------------------------------------------------------------------
248	REAL, PARAMETER :: XKA=2.4E-5
249	REAL, PARAMETER :: PRT=1.
250
251	INTEGER, INTENT(IN ) :: ids,ide, jds,jde, kds,kde, &
252	ims,ime, jms,jme, kms,kme, &
253	its,ite, jts,jte, kts,kte, &
254	J
255	!
256	INTEGER, INTENT(IN ) :: ISFFLX
257	REAL, INTENT(IN ) :: SVP1,SVP2,SVP3,SVPT0
258	REAL, INTENT(IN ) :: EP1,EP2,KARMAN
259
260	!
261	REAL, DIMENSION( ims:ime ) , &
262	INTENT(IN ) :: MAVAIL, &
263	PBLH, &
264	XLAND, &
265	TG
266	!
267	REAL, DIMENSION( ims:ime ) , &
268	INTENT(IN ) :: PSFCPA
269
270	REAL, DIMENSION( ims:ime ) , &
271	INTENT(INOUT) :: REGIME, &
272	HFX, &
273	QFX, &
274	MOL,RMOL
275	!m the following 5 are changed to memory size---
276	!
277	REAL, DIMENSION( ims:ime ) , &
278	INTENT(INOUT) :: GZ1OZ0,WSPD,BR, &
279	PSIM,PSIH
280
281	REAL, DIMENSION( ims:ime ) , &
282	INTENT(INOUT) :: ZNT, &
283	ZOL, &
284	UST, &
285	CPM, &
286	CHS2, &
287	CQS2, &
288	CHS
289
290	REAL, DIMENSION( ims:ime ) , &
291	INTENT(INOUT) :: FLHC,FLQC
292
293	REAL, DIMENSION( ims:ime ) , &
294	INTENT(INOUT) :: &
295	QGH
296
297	REAL, DIMENSION( ims:ime ) , &
298	INTENT(OUT) :: U10,V10, &
299	QSFC,LH
300
301	REAL, INTENT(IN ) :: CP,G,ROVCP,XLV,DX,R
302
303	! MODULE-LOCAL VARIABLES, DEFINED IN SUBROUTINE SFCLAY
304	REAL, DIMENSION( its:ite ), INTENT(IN ) :: dz8w1d
305
306	REAL, DIMENSION( its:ite ), INTENT(IN ) :: US, &
307	VS, &
308	QV1D, &
309	P1D, &
310	T1D, &
311	THETA1
312
313	! LOCAL VARS
314
315	REAL, DIMENSION( its:ite ) :: ZA, &
316	TH0, &
317	THETAG, &
318	WS, &
319	RICUT, &
320	USTM, &
321	RA, &
322	THETAV1, &
323	MOLENGTH
324	!
325	REAL, DIMENSION( its:ite ) :: &
326	RHOX,GOVRTH
327	!
328	REAL, DIMENSION( its:ite ) :: PSFC
329	!
330	INTEGER :: KL
331
332	INTEGER :: N,I,K,KK,L,NZOL,NK,NZOL2,NZOL10
333
334	REAL :: PL,THCON,TVCON,E1
335	REAL :: ZL,TSKV,DTHVDZ,DTHVM,VCONV,RZOL,RZOL2,RZOL10,ZOL2,ZOL10
336	REAL :: DTG,PSIX,DTTHX,PSIX10,PSIT,PSIT2,PSIQ,PSIQ2
337	REAL :: FLUXC,VSGD
338	REAL :: XMOL,ZOBOL,Z10OL,ZNTOL,YNT,YOB,X1,X2
339	REAL :: G2OZ0,G10OZ0,RA2,ZOLL
340	REAL :: TV0,CPOT,RICRITI,AM,AH,SQLNZZ0,RBH,RBW,TSTV
341	REAL :: PSIH2, PSIM2, PSIH10, PSIM10, CQS
342
343	!-------------------------------Exicutable starts here--------------------
344
345	DO i = its,ite
346	! PSFC cb
347	PSFC(I)=PSFCPA(I)/1000.
348	TVCON = 1.0 + EP1 * QV1D(I)
349	THETAV1(I) = THETA1(I) * TVCON
350	RHOX(I)=PSFCPA(I)/(RT1D(I)TVCON)
351	ENDDO
352
353	!
354	!-----Compute virtual potential temperature at surface
355	!
356	DO I=its,ite
357	E1=SVP1EXP( SVP2(TG(I)-SVPT0)/(TG(I)-SVP3) )
358	QSFC(I)=EP2*E1/(PSFC(I)-E1)
359
360	! QGH CHANGED TO USE LOWEST-LEVEL AIR TEMP CONSISTENT WITH MYJSFC CHANGE
361	! Q2SAT = QGH IN LSM
362	E1=SVP1EXP(SVP2(T1D(I)-SVPT0)/(T1D(I)-SVP3))
363	PL = P1D(I)/1000.
364	QGH(I)=EP2*E1/(PL-E1)
365	CPM(I)=CP(1.+0.8QV1D(I))
366	enddo
367
368	!.......... compute the thetav at ground
369	DO I = its, ite
370	TV0 = TG(I) * (1.0 + EP1 * QSFC(I)*MAVAIL(I))
371	CPOT = (100./PSFC(I))**ROVCP
372	TH0(I) = TV0 * (100./PSFC(I))**ROVCP
373	THETAG(I) = CPOT * TG(I)
374	ENDDO
375	!
376	!-----COMPUTE THE HEIGHT OF FULL- AND HALF-SIGMA LEVELS ABOVE GROUND
377	! LEVEL, AND THE LAYER THICKNESSES.
378	!
379	!... DZ8W1D is DZ between full sigma levels and Z0 is the height of the first
380	! half sigma level
381	DO I = its,ite
382	ZA(I) = 0.5 * DZ8W1D(I)
383	WS(I) = SQRT(US(I) * US(I) + VS(I) * VS(I))
384	ENDDO
385	!
386	!-----CALCULATE BULK RICHARDSON NO. OF SURFACE LAYER, ACCORDING TO
387	! AKB(1976), EQ(12).
388
389	RICRITI = 1.0 / RICRIT
390
391	DO i = its,ite
392	GZ1OZ0(I) = ALOG(ZA(I) / ZNT(I))
393	DTHVDZ = THETAV1(I) - TH0(I)
394	fluxc = max(hfx(i)/rhox(i)/cp &
395	+ ep1TH0(I)qfx(i)/rhox(i),0.)
396	VCONV = vconvc(g/tg(i)pblh(i)fluxc)*.33
397	VSGD = 0.32 * (max(dx/5000.-1.,0.))**.33
398	WSPD(I)=SQRT(WS(I)WS(I)+VCONVVCONV+vsgd*vsgd)
399	WSPD(I) = AMAX1(WSPD(I),0.1)
400	GOVRTH(I) = G / THETA1(I)
401	BR(I) = GOVRTH(I) * ZA(I) * DTHVDZ / (WSPD(I) * WSPD(I))
402	RICUT(I) = 1.0 / (RICRITI + GZ1OZ0(I))
403	ENDDO
404
405	DO I = its,ite
406	!------------------------------------------------------------------
407	!-- NOTE THAT THE REGIMES USED IN HIRPBL HAVE BEEN CHANGED:
408	ZOLL = 0.0
409	IF (BR(I) .GE. RICUT(I)) THEN
410	!
411	!-----CLASS 1; VERY STABLE CONDITIONS: Z/L > 1
412	!
413	REGIME(I) = 1.0
414	ZOLL = BR(I) * GZ1OZ0(I) / (1.0 - RICRITI * RICUT(I))
415	PSIM(I) = 1.0 - BETAM - ZOLL
416	PSIH(I) = 1.0 - BETAH - ZOLL
417
418	ELSE IF (BR(I) .GE. 0.0) THEN
419
420	!-----CLASS 2; STABLE: for 1 > Z/L >0
421	!
422	REGIME(I) = 2.0
423	ZOLL = BR(I) * GZ1OZ0(I) / (1.0 - RICRITI * BR(I))
424	PSIM(I) = -BETAM * ZOLL
425	PSIH(I) = -BETAH * ZOLL
426
427	ELSE
428	!
429	!-----CLASS 3 or 4; UNSTABLE:
430	! CLASS 4 IS FOR ACM NON-LOCAL CONVECTION (H/L < -3)
431	!
432	REGIME(I) = 3.0 ! Regime will be reset to 4 if ACM is used
433	AM = 0.031 + 0.276 * ALOG(GZ1OZ0(I))
434	AH = 0.04 + 0.355 * ALOG(GZ1OZ0(I))
435	SQLNZZ0 = SQRT(GZ1OZ0(I))
436	PSIM(I) = AM * ALOG(1.0 - BM * SQLNZZ0 * BR(I))
437	PSIH(I) = AH * ALOG(1.0 - BH * SQLNZZ0 * BR(I))
438	!
439	ENDIF
440	ENDDO
441	!
442	!-----COMPUTE THE FRICTIONAL VELOCITY AND SURFACE FLUXES:
443	!
444	DO I = its,ite
445	DTG = THETA1(I) - THETAG(I)
446	PSIX = GZ1OZ0(I) - PSIM(I)
447	UST(I)=0.5UST(I)+0.5KARMAN*WSPD(I)/PSIX
448	USTM(I) = UST(I)
449
450	!-----OVER WATER, ALTER ROUGHNESS LENGTH (Z0) ACCORDING TO WIND (UST).
451	!
452	IF ((XLAND(I)-1.5) .GE. 0.0) THEN
453	ZNT(I) = CZO * USTM(I) * USTM(I) / G + OZO
454	GZ1OZ0(I) = ALOG(ZA(I) / ZNT(I))
455	PSIX = GZ1OZ0(I) - PSIM(I)
456	UST(I) = KARMAN * WSPD(I) / PSIX
457	USTM(I) = UST(I)
458	ENDIF
459
460	RA(I) = PR0 * (GZ1OZ0(I) - PSIH(I)) / (KARMAN * UST(I))
461	RBH = 5.0 / UST(I) ! 5/U* ! WESELY AND HICKS (1977)
462	!... RB FOR WATER VAPOR = 5*(0.599/0.709)^2/3 /UST = 4.47/UST hi
463	RBW = 4.47/UST(I)
464	CHS(I) = 1./(RA(I) + RBH)
465	CQS = 1./(RA(I) + RBW)
466	MOL(I) = DTG * CHS(I) / UST(I) ! This is really TST
467	TSTV = (THETAV1(I) - TH0(I)) * CHS(I) / UST(I)
468	IF (ABS(TSTV) .LT. 1.E-5) TSTV = 1.E-5
469	MOLENGTH(I) = THETAV1(I) * UST(I) * UST(I) / (KARMAN * &
470	G * TSTV)
471	!
472	!---Compute 2m surface exchange coefficients for heat and moisture
473	XMOL = MOLENGTH(I)
474	IF(MOLENGTH(I).GT.0.0) XMOL = AMAX1(MOLENGTH(I),2.0)
475	RMOL(I) = 1/XMOL
476	ZOL(I) = ZA(I)*RMOL(I)
477	ZOBOL = 1.5*RMOL(I)
478	Z10OL = 10.0*RMOL(I)
479	ZNTOL = ZNT(I)*RMOL(I)
480	IF(XMOL.LT.0.0) THEN
481	YNT = ( 1.0 - GAMAH * ZNTOL )**0.5
482	YOB = ( 1.0 - GAMAH * ZOBOL )**0.5
483	PSIH2 = 2. * ALOG((YOB+1.0)/(YNT+1.0))
484	x1 = (1.0 - gamam * z10ol)**0.25
485	x2 = (1.0 - gamam * zntol)**0.25
486	psim10 = 2.0 * ALOG( (1.0+x1) / (1.0+x2) ) + &
487	ALOG( (1.0+x1x1) / (1.0+x2x2)) - &
488	2.0 * ATAN(x1) + 2.0 * ATAN(x2)
489	ELSE
490	IF((ZOBOL-ZNTOL).LE.1.0) THEN
491	PSIH2 = -BETAH*(ZOBOL-ZNTOL)
492	ELSE
493	PSIH2 = 1.-BETAH-(ZOBOL-ZNTOL)
494	ENDIF
495	IF((Z10OL-ZNTOL).LE.1.0) THEN
496	PSIM10 = -BETAM*(Z10OL-ZNTOL)
497	ELSE
498	PSIM10 = 1.-BETAM-(Z10OL-ZNTOL)
499	ENDIF
500	ENDIF
501	G2OZ0 = ALOG(1.5 / ZNT(I))
502	G10OZ0 = ALOG(10.0 / ZNT(I))
503	RA2 = PR0 * (G2OZ0 - PSIH2) / (KARMAN * UST(I))
504	CHS2(I) = 1.0/(RA2 + RBH)
505	CQS2(I) = 1.0/(RA2 + RBW)
506	U10(I) = US(I)*(G10OZ0-PSIM10)/PSIX
507	V10(I) = VS(I)*(G10OZ0-PSIM10)/PSIX
508	!IF(I.EQ.60.AND.J.EQ.60) PRINT *,' ZNT,USTM,U10,UZ1=',ZNT(I),USTM(I),U10(I),US(I)
509	!
510	!-----COMPUTE SURFACE HEAT AND MOIST FLUX:
511	!
512	FLHC(i)=CPM(I)RHOX(I)CHS(I)
513	FLQC(i)=RHOX(I)CQSMAVAIL(I)
514	QFX(I)=FLQC(I)*(QSFC(I)-QV1D(I))
515	QFX(I)=AMAX1(QFX(I),0.)
516	LH(I)=XLV*QFX(I)
517	IF(XLAND(I)-1.5.GT.0.)THEN
518	HFX(I)=-FLHC(I)*DTG
519	ELSEIF(XLAND(I)-1.5.LT.0.)THEN
520	HFX(I)=-FLHC(I)*DTG
521	HFX(I)=AMAX1(HFX(I),-250.)
522	ENDIF
523	ENDDO
524	END SUBROUTINE PXSFCLAY1D
525
526	!====================================================================
527	SUBROUTINE pxsfclayinit( allowed_to_read )
528
529	LOGICAL , INTENT(IN) :: allowed_to_read
530	INTEGER :: N
531	REAL :: ZOLN,X,Y
532
533
534	END SUBROUTINE pxsfclayinit
535
536	!-------------------------------------------------------------------
537
538	END MODULE module_sf_pxsfclay

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