/[MITgcm]/MITgcm/model/src/ini_p_ground.F
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Contents of /MITgcm/model/src/ini_p_ground.F

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Revision 1.11 - (show annotations) (download)
Mon Apr 4 21:29:00 2016 UTC (8 years, 1 month ago) by jmc
Branch: MAIN
CVS Tags: checkpoint65z, checkpoint65x, checkpoint65y, checkpoint65v, checkpoint65w, checkpoint66g, checkpoint66f, checkpoint66e, checkpoint66d, checkpoint66c, checkpoint66b, checkpoint66a, checkpoint66o, checkpoint66n, checkpoint66m, checkpoint66l, checkpoint66k, checkpoint66j, checkpoint66i, checkpoint66h, HEAD
Changes since 1.10: +4 -4 lines
- new parameters "top_Pres" & "seaLev_Z" (replacing Ro_SeaLevel and recently
  added phi0Ref) to set vertical axis origin and phiRef origin according to
  coordinate and fluid type.

1 C $Header: /u/gcmpack/MITgcm/model/src/ini_p_ground.F,v 1.10 2016/03/10 20:52:43 jmc Exp $
2 C $Name: $
3
4 #include "CPP_OPTIONS.h"
5 #undef CHECK_ANALYLIC_THETA
6
7 CBOP
8 C !ROUTINE: INI_P_GROUND
9 C !INTERFACE:
10 SUBROUTINE INI_P_GROUND(selectMode,
11 & Hfld, Pfld,
12 I myThid )
13 C !DESCRIPTION: \bv
14 C *==========================================================*
15 C | SUBROUTINE INI_P_GROUND
16 C | o Convert Topography [m] to (reference) Surface Pressure
17 C | according to tRef profile,
18 C | using same discretisation as in calc_phi_hyd
19 C |
20 C *==========================================================*
21 C \ev
22
23 C !USES:
24 IMPLICIT NONE
25 C == Global variables ==
26 #include "SIZE.h"
27 #include "GRID.h"
28 #include "EEPARAMS.h"
29 #include "PARAMS.h"
30 #include "SURFACE.h"
31
32 C !INPUT/OUTPUT PARAMETERS:
33 C == Routine arguments ==
34 C selectMode :: > 0 = find Pfld from Hfld ; < 0 = compute Hfld from Pfld
35 C selectFindRoSurf = 0 : use Theta_Ref profile
36 C selectFindRoSurf = 1 : use analytic fct Theta(Lat,P)
37 C Hfld (input/outp) :: Ground elevation [m]
38 C Pfld (outp/input) :: reference Pressure at the ground [Pa]
39 INTEGER selectMode
40 _RS Hfld(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
41 _RS Pfld(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
42 INTEGER myThid
43
44 C !LOCAL VARIABLES:
45 C == Local variables ==
46 C msgBuf :: Informational/error message buffer
47 C-
48 C For an accurate definition of the reference surface pressure,
49 C define a High vertical resolution (in P):
50 C nLevHvR :: Number of P-level used for High vertical Resolution (HvR)
51 C plowHvR :: Lower bound of the High vertical Resolution
52 C dpHvR :: normalized pressure increment (HvR)
53 C pLevHvR :: normalized P-level of the High vertical Resolution
54 C pMidHvR :: normalized mid point level (HvR)
55 C thetaHvR :: potential temperature at mid point level (HvR)
56 C PiHvR :: Exner function at P-level
57 C dPiHvR :: Exner function difference between 2 P-levels
58 C recip_kappa :: 1/kappa = Cp/R
59 C PiLoc, zLoc, dzLoc, yLatLoc, phiLoc :: hold on temporary values
60 C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
61 CHARACTER*(MAX_LEN_MBUF) msgBuf
62 INTEGER bi,bj,i,j,k, ks
63 _RL Po_surf
64 _RL hRef(2*Nr+1), rHalf(2*Nr+1)
65 LOGICAL findPoSurf
66
67 INTEGER nLevHvR
68 PARAMETER ( nLevHvR = 60 )
69 _RL plowHvR, dpHvR, pLevHvR(nLevHvR+1), pMidHvR(nLevHvR)
70 _RL thetaHvR(nLevHvR), PiHvR(nLevHvR+1), dPiHvR(nLevHvR)
71 _RL recip_kappa, PiLoc, zLoc, dzLoc, yLatLoc, phiLoc
72 _RL psNorm, rMidKp1
73 _RL ratioRm(Nr), ratioRp(Nr)
74 INTEGER kLev
75 #ifdef CHECK_ANALYLIC_THETA
76 _RL tmpVar(nLevHvR,61)
77 #endif
78 CEOP
79
80 IF ( selectFindRoSurf.LT.0 .OR. selectFindRoSurf.GT.1 ) THEN
81 WRITE(msgBuf,'(A,I2,A)')
82 & 'INI_P_GROUND: selectFindRoSurf =', selectFindRoSurf,
83 & ' <== bad value !'
84 CALL PRINT_ERROR( msgBuf, myThid )
85 STOP 'INI_P_GROUND'
86 ENDIF
87
88 DO k=1,Nr
89 rHalf(2*k-1) = rF(k)
90 rHalf(2*k) = rC(k)
91 ENDDO
92 rHalf(2*Nr+1) = rF(Nr+1)
93
94 C- Reference Geopotential at Half levels :
95 C Tracer level: hRef(2k) ; Interface_W level: hRef(2k+1)
96 C- Convert phiRef to Z unit :
97 DO k=1,2*Nr+1
98 hRef(k) = phiRef(k)*recip_gravity
99 ENDDO
100
101 IF (selectFindRoSurf.EQ.0 .AND. selectMode .GT. 0 ) THEN
102 C- Find Po_surf : Linear between 2 half levels :
103 DO bj = myByLo(myThid), myByHi(myThid)
104 DO bi = myBxLo(myThid), myBxHi(myThid)
105 DO j=1,sNy
106 DO i=1,sNx
107 ks = 1
108 DO k=1,2*Nr
109 IF (Hfld(i,j,bi,bj).GE.hRef(k)) ks = k
110 ENDDO
111 Po_surf = rHalf(ks) + (rHalf(ks+1)-rHalf(ks))*
112 & (Hfld(i,j,bi,bj)-hRef(ks))/(hRef(ks+1)-hRef(ks))
113
114 c IF (Hfld(i,j,bi,bj).LT.hRef(1)) Po_surf= rHalf(1)
115 c IF (Hfld(i,j,bi,bj).GT.hRef(2*Nr+1)) Po_surf=rHalf(2*Nr+1)
116 Pfld(i,j,bi,bj) = Po_surf
117 ENDDO
118 ENDDO
119 ENDDO
120 ENDDO
121
122 C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
123 C-- endif selectFindRoSurf=0 & selectMode > 0
124 ENDIF
125
126 IF ( selectFindRoSurf.EQ.1 ) THEN
127 C-- define high resolution Pressure discretization:
128
129 recip_kappa = 1. _d 0 / atm_kappa
130 plowHvR = 0.4 _d 0
131 dpHvR = nLevHvR
132 dpHvR = (1. - plowHvR) / dpHvR
133 pLevHvR(1)= rF(1)/atm_Po
134 PiHvR(1) = atm_Cp*(pLevHvR(1)**atm_kappa)
135 DO k=1,nLevHvR
136 pLevHvR(k+1)= pLevHvR(1) - k*dpHvR
137 PiHvR(k+1) = atm_Cp*(pLevHvR(k+1)**atm_kappa)
138 pMidHvR(k)= (pLevHvR(k)+pLevHvR(k+1))*0.5 _d 0
139 dPiHvR(k) = PiHvR(k) - PiHvR(k+1)
140 ENDDO
141
142 C-- to modify pressure when using non fully linear relation between Phi & p
143 C (Integr_GeoPot=2 & Tracer Point at middle between 2 interfaces)
144 DO k=1,Nr
145 ratioRm(k) = 1. _d 0
146 ratioRp(k) = 1. _d 0
147 IF (k.GT.1 ) ratioRm(k) = 0.5 _d 0*drC(k)/(rF(k)-rC(k))
148 IF (k.LT.Nr) ratioRp(k) = 0.5 _d 0*drC(k+1)/(rC(k)-rF(k+1))
149 ENDDO
150
151 #ifdef CHECK_ANALYLIC_THETA
152 _BEGIN_MASTER( myThid )
153 DO j=1,61
154 yLatLoc =-90.+(j-1)*3.
155 CALL ANALYLIC_THETA( yLatLoc, pMidHvR,
156 & tmpVar(1,j), nLevHvR, myThid )
157 ENDDO
158 OPEN(88,FILE='analytic_theta',
159 & STATUS='unknown',FORM='unformatted')
160 WRITE(88) tmpVar
161 CLOSE(88)
162 _END_MASTER( myThid )
163 STOP 'CHECK_ANALYLIC_THETA'
164 #endif /* CHECK_ANALYLIC_THETA */
165
166 C-- endif selectFindRoSurf=1
167 ENDIF
168
169 IF ( selectFindRoSurf*selectMode .GT. 0) THEN
170 C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
171 C- Find Po_surf such as g*Hfld = Phi[Po_surf,theta(yLat,p)]:
172
173 DO bj = myByLo(myThid), myByHi(myThid)
174 DO bi = myBxLo(myThid), myBxHi(myThid)
175 C- start bi,bj loop:
176
177 DO j=1,sNy
178 DO i=1,sNx
179 phiLoc = Hfld(i,j,bi,bj) - hRef(1)
180 IF ( phiLoc .LE. 0. _d 0 ) THEN
181 Pfld(i,j,bi,bj) = rF(1)
182 ELSE
183 yLatLoc = yC(i,j,bi,bj)
184 CALL ANALYLIC_THETA( yLatLoc, pMidHvR,
185 & thetaHvR, nLevHvR, myThid )
186 zLoc = 0.
187 DO k=1,nLevHvR
188 IF (zLoc.GE.0.) THEN
189 C- compute phi/g corresponding to next p_level:
190 dzLoc = dPiHvR(k)*thetaHvR(k)*recip_gravity
191 IF ( phiLoc .LE. zLoc+dzLoc ) THEN
192 C- compute the normalized surf. Pressure psNorm
193 PiLoc = PiHvR(k)
194 & - gravity*( phiLoc - zLoc )/thetaHvR(k)
195 psNorm = (PiLoc/atm_Cp)**recip_kappa
196 C- use linear interpolation:
197 c psNorm = pLevHvR(k)
198 c & - dpHvR*( phiLoc - zLoc )/dzLoc
199 zLoc = -1.
200 ELSE
201 zLoc = zLoc + dzLoc
202 ENDIF
203 ENDIF
204 ENDDO
205 IF (zLoc.GE.0.) THEN
206 WRITE(msgBuf,'(2A)')
207 & 'INI_P_GROUND: FAIL in trying to find Pfld:',
208 & ' selectMode,i,j,bi,bj=',selectMode,i,j,bi,bj
209 CALL PRINT_ERROR( msgBuf, myThid )
210 WRITE(msgBuf,'(A,F7.1,2A,F6.4,A,F8.0)')
211 & 'INI_P_GROUND: Hfld=', Hfld(i,j,bi,bj), ' exceeds',
212 & ' Zloc(lowest P=', pLevHvR(1+nLevHvR),' )=',zLoc
213 CALL PRINT_ERROR( msgBuf, myThid )
214 STOP 'ABNORMAL END: S/R INI_P_GROUND'
215 ELSE
216 Pfld(i,j,bi,bj) = psNorm*atm_Po
217 ENDIF
218 ENDIF
219 ENDDO
220 ENDDO
221
222 IF (selectMode.EQ.2 .AND. integr_GeoPot.NE.1) THEN
223 C---------
224 C Modify pressure to account for non fully linear relation between
225 C Phi & p (due to numerical truncation of the Finite Difference scheme)
226 C---------
227 DO j=1,sNy
228 DO i=1,sNx
229 Po_surf = Pfld(i,j,bi,bj)
230 IF ( Po_surf.LT.rC(1) .AND. Po_surf.GT.rC(Nr) ) THEN
231 findPoSurf = .TRUE.
232 DO k=1,Nr
233 IF ( findPoSurf .AND. Po_surf.GE.rC(k) ) THEN
234 Po_surf = rC(k) + (Po_surf-rC(k))/ratioRm(k)
235 findPoSurf = .FALSE.
236 ENDIF
237 rMidKp1 = rF(k+1)
238 IF (k.LT.Nr) rMidKp1 = (rC(k)+rC(k+1))*0.5 _d 0
239 IF ( findPoSurf .AND. Po_surf.GE.rMidKp1 ) THEN
240 Po_surf = rC(k) + (Po_surf-rC(k))/ratioRp(k)
241 findPoSurf = .FALSE.
242 ENDIF
243 ENDDO
244 IF ( findPoSurf )
245 & STOP 'S/R INI_P_GROUND: Pb with selectMode=2'
246 ENDIF
247 Pfld(i,j,bi,bj) = Po_surf
248 ENDDO
249 ENDDO
250 C---------
251 ENDIF
252
253 C- end bi,bj loop.
254 ENDDO
255 ENDDO
256
257 C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
258 C-- endif selectFindRoSurf*selectMode > 0
259 ENDIF
260
261 IF (selectMode .LT. 0) THEN
262 C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
263 C--- Compute Hfld = Phi(Pfld)/g.
264
265 DO bj = myByLo(myThid), myByHi(myThid)
266 DO bi = myBxLo(myThid), myBxHi(myThid)
267 C- start bi,bj loop:
268
269 C-- Compute Hfld from g*Hfld = hRef(Po_surf)
270 DO j=1,sNy
271 DO i=1,sNx
272 C- compute phiLoc = hRef(Ro_surf):
273 ks = kSurfC(i,j,bi,bj)
274 IF (ks.LE.Nr) THEN
275 C- sigma coord. case (=> uniform kSurfC), find true ks:
276 IF ( selectSigmaCoord.NE.0 ) THEN
277 DO k=2,Nr
278 IF ( Pfld(i,j,bi,bj).LT.rF(k) ) ks = k
279 ENDDO
280 ENDIF
281 IF ( Pfld(i,j,bi,bj).GE.rC(ks) ) THEN
282 phiLoc = hRef(2*ks)
283 & + (hRef(2*ks-1)-hRef(2*ks))
284 & *(Pfld(i,j,bi,bj)-rC(ks))/(rHalf(2*ks-1)-rHalf(2*ks))
285 ELSE
286 phiLoc = hRef(2*ks)
287 & + (hRef(2*ks+1)-hRef(2*ks))
288 & *(Pfld(i,j,bi,bj)-rC(ks))/(rHalf(2*ks+1)-rHalf(2*ks))
289 ENDIF
290 Hfld(i,j,bi,bj) = phiLoc
291 ELSE
292 Hfld(i,j,bi,bj) = 0.
293 ENDIF
294 ENDDO
295 ENDDO
296
297 IF (selectFindRoSurf.EQ.1) THEN
298 C-----
299 C goal: evaluate phi0surf (used for computing geopotential_prime = Phi - PhiRef):
300 C phi0surf = g*Ztopo-PhiRef(Ro_surf) if no truncation was applied to Ro_surf;
301 C but because of hFacMin, surf.ref.pressure (=Ro_surf) is truncated and
302 C phi0surf = Phi(Theta-Analytic,P=Ro_surf) - PhiRef(P=Ro_surf)
303 C-----
304 C-- Compute Hfld from g*Hfld = Phi[Po_surf,theta(yLat,p)]:
305 DO j=1,sNy
306 DO i=1,sNx
307 zLoc = hRef(1)
308 IF ( Pfld(i,j,bi,bj) .LT. rF(1) ) THEN
309 Po_surf = Pfld(i,j,bi,bj)
310 C---------
311 C Modify pressure to account for non fully linear relation between
312 C Phi & p (due to numerical truncation of the Finite Difference scheme)
313 IF (selectMode.EQ.-2 .AND. integr_GeoPot.NE.1) THEN
314 IF ( Po_surf.LT.rC(1) .AND. Po_surf.GT.rC(Nr) ) THEN
315 findPoSurf = .TRUE.
316 DO k=1,Nr
317 IF ( findPoSurf .AND. Po_surf.GE.rC(k) ) THEN
318 Po_surf = rC(k) + (Po_surf-rC(k))*ratioRm(k)
319 findPoSurf = .FALSE.
320 ENDIF
321 IF ( findPoSurf .AND. Po_surf.GE.rF(k+1) ) THEN
322 Po_surf = rC(k) + (Po_surf-rC(k))*ratioRp(k)
323 findPoSurf = .FALSE.
324 ENDIF
325 ENDDO
326 ENDIF
327 ENDIF
328 C---------
329 psNorm = Po_surf/atm_Po
330 kLev = 1 + INT( (pLevHvR(1)-psNorm)/dpHvR )
331 yLatLoc = yC(i,j,bi,bj)
332 CALL ANALYLIC_THETA( yLatLoc, pMidHvR,
333 & thetaHvR, kLev, myThid )
334 C- compute height at level pLev(kLev) just below Pfld:
335 DO k=1,kLev-1
336 dzLoc = dPiHvR(k)*thetaHvR(k)*recip_gravity
337 zLoc = zLoc + dzLoc
338 ENDDO
339 dzLoc = ( PiHvR(kLev)-atm_Cp*(psNorm**atm_kappa) )
340 & * thetaHvR(kLev)*recip_gravity
341 zLoc = zLoc + dzLoc
342 ENDIF
343 C- compute phi0surf = Phi[Po_surf,theta(yLat,p)] - PhiRef(Po_surf)
344 phi0surf(i,j,bi,bj) = gravity*(zLoc - Hfld(i,j,bi,bj))
345 C- save Phi[Po_surf,theta(yLat,p)] in Hfld (replacing PhiRef(Po_surf)):
346 Hfld(i,j,bi,bj) = zLoc
347 ENDDO
348 ENDDO
349 C- endif selectFindRoSurf=1
350 ENDIF
351
352 C- end bi,bj loop.
353 ENDDO
354 ENDDO
355
356 C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
357 C-- endif selectMode < 0
358 ENDIF
359
360 RETURN
361 END
362
363 CBOP
364 C !SUBROUTINE: ANALYLIC_THETA
365 C !INTERFACE:
366 SUBROUTINE ANALYLIC_THETA( yLat, pNlev,
367 O thetaLev,
368 I kSize, myThid )
369
370 C !DESCRIPTION: \bv
371 C *==========================================================*
372 C | SUBROUTINE ANALYLIC_THETA
373 C | o Conpute analyticaly the potential temperature Theta
374 C | as a function of Latitude (yLat) and normalized
375 C | pressure pNlev.
376 C | approximatively match the N-S symetric, zonal-mean and
377 C | annual-mean NCEP climatology in the troposphere.
378 C *==========================================================*
379 C \ev
380
381 C !USES:
382 IMPLICIT NONE
383
384 C == Global variables ==
385 #include "SIZE.h"
386 #include "EEPARAMS.h"
387 #include "PARAMS.h"
388
389 C !INPUT/OUTPUT PARAMETERS:
390 C == Routine arguments ==
391 C yLat :: latitude (degre)
392 C pNlev :: normalized pressure levels
393 C kSize :: dimension of pNlev & ANALYLIC_THETA
394 C myThid :: Thread number for this instance of the routine
395 INTEGER kSize
396 _RL yLat
397 _RL pNlev (kSize)
398 _RL thetaLev(kSize)
399 INTEGER myThid
400
401 C !LOCAL VARIABLES:
402 C == Local variables ==
403 INTEGER k
404 _RL yyA, yyB, yyC, yyAd, yyBd, yyCd
405 _RL cAtmp, cBtmp, ttdC
406 _RL ppN0, ppN1, ppN2, ppN3a, ppN3b, ppN4
407 _RL ttp1, ttp2, ttp3, ttp4, ttp5
408 _RL yAtmp, yBtmp, yCtmp, yDtmp
409 _RL ttp2y, ttp4y, a1tmp
410 _RL ppl, ppm, pph, ppr
411 CEOP
412
413 DATA yyA , yyB , yyC , yyAd , yyBd , yyCd
414 & / 45. _d 0, 65. _d 0, 65. _d 0, .9 _d 0, .9 _d 0, 10. _d 0 /
415 DATA cAtmp , cBtmp , ttdC
416 & / 2.6 _d 0, 1.5 _d 0, 3.3 _d 0 /
417 DATA ppN0 , ppN1 , ppN2 , ppN3a , ppN3b , ppN4
418 & / .1 _d 0, .19 _d 0, .3 _d 0, .9 _d 0, .7 _d 0, .925 _d 0 /
419 DATA ttp1 , ttp2 , ttp3 , ttp4 , ttp5
420 & / 350. _d 0, 342. _d 0, 307. _d 0, 301. _d 0, 257. _d 0 /
421
422 C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----|
423
424 yAtmp = ABS(yLat) - yyA
425 yAtmp = yyA + MIN(0. _d 0,yAtmp/yyAd) + MAX(yAtmp, 0. _d 0)
426 yAtmp = COS( deg2rad*MAX(yAtmp, 0. _d 0) )
427 yBtmp = ABS(yLat) - yyB
428 yBtmp = yyB + yBtmp/yyBd
429 yBtmp = COS( deg2rad*MAX( 0. _d 0, MIN(yBtmp,90. _d 0) ) )
430 yCtmp = ABS(yLat) - yyC
431 yCtmp = MAX( 0. _d 0, 1. _d 0 - (yCtmp/yyCd)**2 )
432 yDtmp = ppN3a +(ppN3b - ppN3a)*yCtmp
433 ttp2y = ttp3 + (ttp2-ttp3)*yAtmp**cAtmp
434 ttp4y = ttp5 + (ttp4-ttp5)*yBtmp**cBtmp
435 a1tmp = (ttp1-ttp2y)*ppN1*ppN2/(ppN2-ppN1)
436 DO k=1,kSize
437 ppl = MIN(pNlev(k),ppN1)
438 ppm = MIN(MAX(pNlev(k),ppN1),ppN2)
439 pph = MAX(pNlev(k),ppN2)
440 ppr =( ppN0 + ABS(ppl-ppN0) - ppN1 )/(ppN2-ppN1)
441 thetaLev(k) =
442 & ( (1. _d 0 -ppr)*ttp1*ppN1**atm_kappa
443 & + ppr*ttp2y*ppN2**atm_kappa
444 & )*ppl**(-atm_kappa)
445 & + a1tmp*(1. _d 0 /ppm - 1. _d 0/ppN1)
446 & + (ttp4y-ttp2y)*(pph-ppN2)/(ppN4-ppN2)
447 & + (ttdC+yCtmp)*MAX(0. _d 0,pNlev(k)-yDtmp)/(1-yDtmp)
448 ENDDO
449
450 C---------------------------------------------------
451 C matlab script, input: pN, yp=abs(yLat)
452 C pN0=.1; pN1=.19 ; pN2=.3; pN4=.925;
453 C pm=min(max(pN,pN1),pN2); pp=max(pN,pN2);
454 C pl=min(pN,pN1); pr=(pN0+abs(pl-pN0)-pN1)/(pN2-pN1);
455 C
456 C yA=yp-45; yA=45+min(0,yA/.9)+max(0,yA); yA=max(0,yA); cosyA=cos(yA*rad) ;
457 C yB=yp-65; yB=65+yB/.9; yB=min(max(0,yB),90); cosyB=cos(yB*rad) ;
458 C tp1=350*ones(nyA,1);
459 C tp2=307+(342-307)*cosyA.^2.6;
460 C tp4=257+(301-257)*cosyB.^1.5;
461 C a1=(tp1-tp2)*pN1*pN2/(pN2-pN1);
462 C pF=max(0,1.-((yp-65)/10).^2); pT=.9+(0.7-.9)*pF;
463 C
464 C tA0=((1-pr(k))*tp1(j)*pN1^kappa+pr(k)*tp2(j)*pN2^kappa)*pl(k)^-kappa;
465 C tA1=a1(j)*(1./pm(k)-1./pN1);
466 C tA2=(tp4(j)-tp2(j))*(pp(k)-pN2)/(pN4-pN2);
467 C tA3=(3.3+pF(j))*max(0,pN(k)-pT(j))/(1-pT(j));
468 C tAn(j,k)=tA0+tA1+tA2+tA3;
469 C---------------------------------------------------
470
471 RETURN
472 END

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