| 1 |
SUBROUTINE LWC(KLIM,PCLDLD,PCLDLU,PEMIS,PFLUC, |
| 2 |
R PBINT,PBSUIN,PCTS,PCNTRB, |
| 3 |
S PFLUX) |
| 4 |
use dimens_m |
| 5 |
use dimphy |
| 6 |
use raddim |
| 7 |
use radepsi |
| 8 |
use radopt |
| 9 |
IMPLICIT none |
| 10 |
C |
| 11 |
C PURPOSE. |
| 12 |
C -------- |
| 13 |
C INTRODUCES CLOUD EFFECTS ON LONGWAVE FLUXES OR |
| 14 |
C RADIANCES |
| 15 |
C |
| 16 |
C EXPLICIT ARGUMENTS : |
| 17 |
C -------------------- |
| 18 |
C ==== INPUTS === |
| 19 |
C PBINT : (KDLON,0:KFLEV) ; HALF LEVEL PLANCK FUNCTION |
| 20 |
C PBSUIN : (KDLON) ; SURFACE PLANCK FUNCTION |
| 21 |
C PCLDLD : (KDLON,KFLEV) ; DOWNWARD EFFECTIVE CLOUD FRACTION |
| 22 |
C PCLDLU : (KDLON,KFLEV) ; UPWARD EFFECTIVE CLOUD FRACTION |
| 23 |
C PCNTRB : (KDLON,KFLEV+1,KFLEV+1); CLEAR-SKY ENERGY EXCHANGE |
| 24 |
C PCTS : (KDLON,KFLEV) ; CLEAR-SKY LAYER COOLING-TO-SPACE |
| 25 |
C PEMIS : (KDLON) ; SURFACE EMISSIVITY |
| 26 |
C PFLUC |
| 27 |
C ==== OUTPUTS === |
| 28 |
C PFLUX(KDLON,2,KFLEV) ; RADIATIVE FLUXES : |
| 29 |
C 1 ==> UPWARD FLUX TOTAL |
| 30 |
C 2 ==> DOWNWARD FLUX TOTAL |
| 31 |
C |
| 32 |
C METHOD. |
| 33 |
C ------- |
| 34 |
C |
| 35 |
C 1. INITIALIZES ALL FLUXES TO CLEAR-SKY VALUES |
| 36 |
C 2. EFFECT OF ONE OVERCAST UNITY EMISSIVITY CLOUD LAYER |
| 37 |
C 3. EFFECT OF SEMI-TRANSPARENT, PARTIAL OR MULTI-LAYERED |
| 38 |
C CLOUDS |
| 39 |
C |
| 40 |
C REFERENCE. |
| 41 |
C ---------- |
| 42 |
C |
| 43 |
C SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
| 44 |
C ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS |
| 45 |
C |
| 46 |
C AUTHOR. |
| 47 |
C ------- |
| 48 |
C JEAN-JACQUES MORCRETTE *ECMWF* |
| 49 |
C |
| 50 |
C MODIFICATIONS. |
| 51 |
C -------------- |
| 52 |
C ORIGINAL : 89-07-14 |
| 53 |
C Voigt lines (loop 231 to 233) - JJM & PhD - 01/96 |
| 54 |
C----------------------------------------------------------------------- |
| 55 |
C* ARGUMENTS: |
| 56 |
INTEGER klim |
| 57 |
REAL*8 PFLUC(KDLON,2,KFLEV+1) ! CLEAR-SKY RADIATIVE FLUXES |
| 58 |
REAL*8 PBINT(KDLON,KFLEV+1) ! HALF LEVEL PLANCK FUNCTION |
| 59 |
REAL*8 PBSUIN(KDLON) ! SURFACE PLANCK FUNCTION |
| 60 |
REAL*8 PCNTRB(KDLON,KFLEV+1,KFLEV+1) !CLEAR-SKY ENERGY EXCHANGE |
| 61 |
REAL*8 PCTS(KDLON,KFLEV) ! CLEAR-SKY LAYER COOLING-TO-SPACE |
| 62 |
c |
| 63 |
REAL*8 PCLDLD(KDLON,KFLEV) |
| 64 |
REAL*8 PCLDLU(KDLON,KFLEV) |
| 65 |
REAL*8 PEMIS(KDLON) |
| 66 |
C |
| 67 |
REAL*8 PFLUX(KDLON,2,KFLEV+1) |
| 68 |
C----------------------------------------------------------------------- |
| 69 |
C* LOCAL VARIABLES: |
| 70 |
INTEGER IMX(KDLON), IMXP(KDLON) |
| 71 |
C |
| 72 |
REAL*8 ZCLEAR(KDLON),ZCLOUD(KDLON),ZDNF(KDLON,KFLEV+1,KFLEV+1) |
| 73 |
S , ZFD(KDLON), ZFN10(KDLON), ZFU(KDLON) |
| 74 |
S , ZUPF(KDLON,KFLEV+1,KFLEV+1) |
| 75 |
REAL*8 ZCLM(KDLON,KFLEV+1,KFLEV+1) |
| 76 |
C |
| 77 |
INTEGER jk, jl, imaxc, imx1, imx2, jkj, jkp1, jkm1 |
| 78 |
INTEGER jk1, jk2, jkc, jkcp1, jcloud |
| 79 |
INTEGER imxm1, imxp1 |
| 80 |
REAL*8 zcfrac |
| 81 |
C ------------------------------------------------------------------ |
| 82 |
C |
| 83 |
C* 1. INITIALIZATION |
| 84 |
C -------------- |
| 85 |
C |
| 86 |
100 CONTINUE |
| 87 |
C |
| 88 |
IMAXC = 0 |
| 89 |
C |
| 90 |
DO 101 JL = 1, KDLON |
| 91 |
IMX(JL)=0 |
| 92 |
IMXP(JL)=0 |
| 93 |
ZCLOUD(JL) = 0. |
| 94 |
101 CONTINUE |
| 95 |
C |
| 96 |
C* 1.1 SEARCH THE LAYER INDEX OF THE HIGHEST CLOUD |
| 97 |
C ------------------------------------------- |
| 98 |
C |
| 99 |
110 CONTINUE |
| 100 |
C |
| 101 |
DO 112 JK = 1 , KFLEV |
| 102 |
DO 111 JL = 1, KDLON |
| 103 |
IMX1=IMX(JL) |
| 104 |
IMX2=JK |
| 105 |
IF (PCLDLU(JL,JK).GT.ZEPSC) THEN |
| 106 |
IMXP(JL)=IMX2 |
| 107 |
ELSE |
| 108 |
IMXP(JL)=IMX1 |
| 109 |
END IF |
| 110 |
IMAXC=MAX(IMXP(JL),IMAXC) |
| 111 |
IMX(JL)=IMXP(JL) |
| 112 |
111 CONTINUE |
| 113 |
112 CONTINUE |
| 114 |
CGM******* |
| 115 |
IMAXC=KFLEV |
| 116 |
CGM******* |
| 117 |
C |
| 118 |
DO 114 JK = 1 , KFLEV+1 |
| 119 |
DO 113 JL = 1, KDLON |
| 120 |
PFLUX(JL,1,JK) = PFLUC(JL,1,JK) |
| 121 |
PFLUX(JL,2,JK) = PFLUC(JL,2,JK) |
| 122 |
113 CONTINUE |
| 123 |
114 CONTINUE |
| 124 |
C |
| 125 |
C ------------------------------------------------------------------ |
| 126 |
C |
| 127 |
C* 2. EFFECT OF CLOUDINESS ON LONGWAVE FLUXES |
| 128 |
C --------------------------------------- |
| 129 |
C |
| 130 |
IF (IMAXC.GT.0) THEN |
| 131 |
C |
| 132 |
IMXP1 = IMAXC + 1 |
| 133 |
IMXM1 = IMAXC - 1 |
| 134 |
C |
| 135 |
C* 2.0 INITIALIZE TO CLEAR-SKY FLUXES |
| 136 |
C ------------------------------ |
| 137 |
C |
| 138 |
200 CONTINUE |
| 139 |
C |
| 140 |
DO 203 JK1=1,KFLEV+1 |
| 141 |
DO 202 JK2=1,KFLEV+1 |
| 142 |
DO 201 JL = 1, KDLON |
| 143 |
ZUPF(JL,JK2,JK1)=PFLUC(JL,1,JK1) |
| 144 |
ZDNF(JL,JK2,JK1)=PFLUC(JL,2,JK1) |
| 145 |
201 CONTINUE |
| 146 |
202 CONTINUE |
| 147 |
203 CONTINUE |
| 148 |
C |
| 149 |
C* 2.1 FLUXES FOR ONE OVERCAST UNITY EMISSIVITY CLOUD |
| 150 |
C ---------------------------------------------- |
| 151 |
C |
| 152 |
210 CONTINUE |
| 153 |
C |
| 154 |
DO 213 JKC = 1 , IMAXC |
| 155 |
JCLOUD=JKC |
| 156 |
JKCP1=JCLOUD+1 |
| 157 |
C |
| 158 |
C* 2.1.1 ABOVE THE CLOUD |
| 159 |
C --------------- |
| 160 |
C |
| 161 |
2110 CONTINUE |
| 162 |
C |
| 163 |
DO 2115 JK=JKCP1,KFLEV+1 |
| 164 |
JKM1=JK-1 |
| 165 |
DO 2111 JL = 1, KDLON |
| 166 |
ZFU(JL)=0. |
| 167 |
2111 CONTINUE |
| 168 |
IF (JK .GT. JKCP1) THEN |
| 169 |
DO 2113 JKJ=JKCP1,JKM1 |
| 170 |
DO 2112 JL = 1, KDLON |
| 171 |
ZFU(JL) = ZFU(JL) + PCNTRB(JL,JK,JKJ) |
| 172 |
2112 CONTINUE |
| 173 |
2113 CONTINUE |
| 174 |
END IF |
| 175 |
C |
| 176 |
DO 2114 JL = 1, KDLON |
| 177 |
ZUPF(JL,JKCP1,JK)=PBINT(JL,JK)-ZFU(JL) |
| 178 |
2114 CONTINUE |
| 179 |
2115 CONTINUE |
| 180 |
C |
| 181 |
C* 2.1.2 BELOW THE CLOUD |
| 182 |
C --------------- |
| 183 |
C |
| 184 |
2120 CONTINUE |
| 185 |
C |
| 186 |
DO 2125 JK=1,JCLOUD |
| 187 |
JKP1=JK+1 |
| 188 |
DO 2121 JL = 1, KDLON |
| 189 |
ZFD(JL)=0. |
| 190 |
2121 CONTINUE |
| 191 |
C |
| 192 |
IF (JK .LT. JCLOUD) THEN |
| 193 |
DO 2123 JKJ=JKP1,JCLOUD |
| 194 |
DO 2122 JL = 1, KDLON |
| 195 |
ZFD(JL) = ZFD(JL) + PCNTRB(JL,JK,JKJ) |
| 196 |
2122 CONTINUE |
| 197 |
2123 CONTINUE |
| 198 |
END IF |
| 199 |
DO 2124 JL = 1, KDLON |
| 200 |
ZDNF(JL,JKCP1,JK)=-PBINT(JL,JK)-ZFD(JL) |
| 201 |
2124 CONTINUE |
| 202 |
2125 CONTINUE |
| 203 |
C |
| 204 |
213 CONTINUE |
| 205 |
C |
| 206 |
C |
| 207 |
C* 2.2 CLOUD COVER MATRIX |
| 208 |
C ------------------ |
| 209 |
C |
| 210 |
C* ZCLM(JK1,JK2) IS THE OBSCURATION FACTOR BY CLOUD LAYERS BETWEEN |
| 211 |
C HALF-LEVELS JK1 AND JK2 AS SEEN FROM JK1 |
| 212 |
C |
| 213 |
220 CONTINUE |
| 214 |
C |
| 215 |
DO 223 JK1 = 1 , KFLEV+1 |
| 216 |
DO 222 JK2 = 1 , KFLEV+1 |
| 217 |
DO 221 JL = 1, KDLON |
| 218 |
ZCLM(JL,JK1,JK2) = 0. |
| 219 |
221 CONTINUE |
| 220 |
222 CONTINUE |
| 221 |
223 CONTINUE |
| 222 |
C |
| 223 |
C |
| 224 |
C |
| 225 |
C* 2.4 CLOUD COVER BELOW THE LEVEL OF CALCULATION |
| 226 |
C ------------------------------------------ |
| 227 |
C |
| 228 |
240 CONTINUE |
| 229 |
C |
| 230 |
DO 244 JK1 = 2 , KFLEV+1 |
| 231 |
DO 241 JL = 1, KDLON |
| 232 |
ZCLEAR(JL)=1. |
| 233 |
ZCLOUD(JL)=0. |
| 234 |
241 CONTINUE |
| 235 |
DO 243 JK = JK1 - 1 , 1 , -1 |
| 236 |
DO 242 JL = 1, KDLON |
| 237 |
IF (NOVLP.EQ.1) THEN |
| 238 |
c* maximum-random |
| 239 |
ZCLEAR(JL)=ZCLEAR(JL)*(1.0-MAX(PCLDLU(JL,JK),ZCLOUD(JL))) |
| 240 |
* /(1.0-MIN(ZCLOUD(JL),1.-ZEPSEC)) |
| 241 |
ZCLM(JL,JK1,JK) = 1.0 - ZCLEAR(JL) |
| 242 |
ZCLOUD(JL) = PCLDLU(JL,JK) |
| 243 |
ELSE IF (NOVLP.EQ.2) THEN |
| 244 |
c* maximum |
| 245 |
ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLU(JL,JK)) |
| 246 |
ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
| 247 |
ELSE IF (NOVLP.EQ.3) THEN |
| 248 |
c* random |
| 249 |
ZCLEAR(JL) = ZCLEAR(JL)*(1.0 - PCLDLU(JL,JK)) |
| 250 |
ZCLOUD(JL) = 1.0 - ZCLEAR(JL) |
| 251 |
ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
| 252 |
END IF |
| 253 |
242 CONTINUE |
| 254 |
243 CONTINUE |
| 255 |
244 CONTINUE |
| 256 |
C |
| 257 |
C |
| 258 |
C* 2.5 CLOUD COVER ABOVE THE LEVEL OF CALCULATION |
| 259 |
C ------------------------------------------ |
| 260 |
C |
| 261 |
250 CONTINUE |
| 262 |
C |
| 263 |
DO 254 JK1 = 1 , KFLEV |
| 264 |
DO 251 JL = 1, KDLON |
| 265 |
ZCLEAR(JL)=1. |
| 266 |
ZCLOUD(JL)=0. |
| 267 |
251 CONTINUE |
| 268 |
DO 253 JK = JK1 , KFLEV |
| 269 |
DO 252 JL = 1, KDLON |
| 270 |
IF (NOVLP.EQ.1) THEN |
| 271 |
c* maximum-random |
| 272 |
ZCLEAR(JL)=ZCLEAR(JL)*(1.0-MAX(PCLDLD(JL,JK),ZCLOUD(JL))) |
| 273 |
* /(1.0-MIN(ZCLOUD(JL),1.-ZEPSEC)) |
| 274 |
ZCLM(JL,JK1,JK) = 1.0 - ZCLEAR(JL) |
| 275 |
ZCLOUD(JL) = PCLDLD(JL,JK) |
| 276 |
ELSE IF (NOVLP.EQ.2) THEN |
| 277 |
c* maximum |
| 278 |
ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLD(JL,JK)) |
| 279 |
ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
| 280 |
ELSE IF (NOVLP.EQ.3) THEN |
| 281 |
c* random |
| 282 |
ZCLEAR(JL) = ZCLEAR(JL)*(1.0 - PCLDLD(JL,JK)) |
| 283 |
ZCLOUD(JL) = 1.0 - ZCLEAR(JL) |
| 284 |
ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
| 285 |
END IF |
| 286 |
252 CONTINUE |
| 287 |
253 CONTINUE |
| 288 |
254 CONTINUE |
| 289 |
C |
| 290 |
C |
| 291 |
C |
| 292 |
C* 3. FLUXES FOR PARTIAL/MULTIPLE LAYERED CLOUDINESS |
| 293 |
C ---------------------------------------------- |
| 294 |
C |
| 295 |
300 CONTINUE |
| 296 |
C |
| 297 |
C* 3.1 DOWNWARD FLUXES |
| 298 |
C --------------- |
| 299 |
C |
| 300 |
310 CONTINUE |
| 301 |
C |
| 302 |
DO 311 JL = 1, KDLON |
| 303 |
PFLUX(JL,2,KFLEV+1) = 0. |
| 304 |
311 CONTINUE |
| 305 |
C |
| 306 |
DO 317 JK1 = KFLEV , 1 , -1 |
| 307 |
C |
| 308 |
C* CONTRIBUTION FROM CLEAR-SKY FRACTION |
| 309 |
C |
| 310 |
DO 312 JL = 1, KDLON |
| 311 |
ZFD (JL) = (1. - ZCLM(JL,JK1,KFLEV)) * ZDNF(JL,1,JK1) |
| 312 |
312 CONTINUE |
| 313 |
C |
| 314 |
C* CONTRIBUTION FROM ADJACENT CLOUD |
| 315 |
C |
| 316 |
DO 313 JL = 1, KDLON |
| 317 |
ZFD(JL) = ZFD(JL) + ZCLM(JL,JK1,JK1) * ZDNF(JL,JK1+1,JK1) |
| 318 |
313 CONTINUE |
| 319 |
C |
| 320 |
C* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
| 321 |
C |
| 322 |
DO 315 JK = KFLEV-1 , JK1 , -1 |
| 323 |
DO 314 JL = 1, KDLON |
| 324 |
ZCFRAC = ZCLM(JL,JK1,JK+1) - ZCLM(JL,JK1,JK) |
| 325 |
ZFD(JL) = ZFD(JL) + ZCFRAC * ZDNF(JL,JK+2,JK1) |
| 326 |
314 CONTINUE |
| 327 |
315 CONTINUE |
| 328 |
C |
| 329 |
DO 316 JL = 1, KDLON |
| 330 |
PFLUX(JL,2,JK1) = ZFD (JL) |
| 331 |
316 CONTINUE |
| 332 |
C |
| 333 |
317 CONTINUE |
| 334 |
C |
| 335 |
C |
| 336 |
C |
| 337 |
C |
| 338 |
C* 3.2 UPWARD FLUX AT THE SURFACE |
| 339 |
C -------------------------- |
| 340 |
C |
| 341 |
320 CONTINUE |
| 342 |
C |
| 343 |
DO 321 JL = 1, KDLON |
| 344 |
PFLUX(JL,1,1) = PEMIS(JL)*PBSUIN(JL)-(1.-PEMIS(JL))*PFLUX(JL,2,1) |
| 345 |
321 CONTINUE |
| 346 |
C |
| 347 |
C |
| 348 |
C |
| 349 |
C* 3.3 UPWARD FLUXES |
| 350 |
C ------------- |
| 351 |
C |
| 352 |
330 CONTINUE |
| 353 |
C |
| 354 |
DO 337 JK1 = 2 , KFLEV+1 |
| 355 |
C |
| 356 |
C* CONTRIBUTION FROM CLEAR-SKY FRACTION |
| 357 |
C |
| 358 |
DO 332 JL = 1, KDLON |
| 359 |
ZFU (JL) = (1. - ZCLM(JL,JK1,1)) * ZUPF(JL,1,JK1) |
| 360 |
332 CONTINUE |
| 361 |
C |
| 362 |
C* CONTRIBUTION FROM ADJACENT CLOUD |
| 363 |
C |
| 364 |
DO 333 JL = 1, KDLON |
| 365 |
ZFU(JL) = ZFU(JL) + ZCLM(JL,JK1,JK1-1) * ZUPF(JL,JK1,JK1) |
| 366 |
333 CONTINUE |
| 367 |
C |
| 368 |
C* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
| 369 |
C |
| 370 |
DO 335 JK = 2 , JK1-1 |
| 371 |
DO 334 JL = 1, KDLON |
| 372 |
ZCFRAC = ZCLM(JL,JK1,JK-1) - ZCLM(JL,JK1,JK) |
| 373 |
ZFU(JL) = ZFU(JL) + ZCFRAC * ZUPF(JL,JK ,JK1) |
| 374 |
334 CONTINUE |
| 375 |
335 CONTINUE |
| 376 |
C |
| 377 |
DO 336 JL = 1, KDLON |
| 378 |
PFLUX(JL,1,JK1) = ZFU (JL) |
| 379 |
336 CONTINUE |
| 380 |
C |
| 381 |
337 CONTINUE |
| 382 |
C |
| 383 |
C |
| 384 |
END IF |
| 385 |
C |
| 386 |
C |
| 387 |
C* 2.3 END OF CLOUD EFFECT COMPUTATIONS |
| 388 |
C |
| 389 |
230 CONTINUE |
| 390 |
C |
| 391 |
IF (.NOT.LEVOIGT) THEN |
| 392 |
DO 231 JL = 1, KDLON |
| 393 |
ZFN10(JL) = PFLUX(JL,1,KLIM) + PFLUX(JL,2,KLIM) |
| 394 |
231 CONTINUE |
| 395 |
DO 233 JK = KLIM+1 , KFLEV+1 |
| 396 |
DO 232 JL = 1, KDLON |
| 397 |
ZFN10(JL) = ZFN10(JL) + PCTS(JL,JK-1) |
| 398 |
PFLUX(JL,1,JK) = ZFN10(JL) |
| 399 |
PFLUX(JL,2,JK) = 0.0 |
| 400 |
232 CONTINUE |
| 401 |
233 CONTINUE |
| 402 |
ENDIF |
| 403 |
C |
| 404 |
RETURN |
| 405 |
END |
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