| 1 | SUBROUTINE OLWC ( KIDIA,KFDIA,KLON,KLEV & |
|---|
| 2 | & , PBINT,PBSUIN,PCLDLD,PCLDLU,PCNTRB,PEMIS,PFDN,PFUP & |
|---|
| 3 | & , PFLUX ) |
|---|
| 4 | ! |
|---|
| 5 | !**** *LWC* - LONGWAVE RADIATION, CLOUD EFFECTS |
|---|
| 6 | ! |
|---|
| 7 | ! PURPOSE. |
|---|
| 8 | ! -------- |
|---|
| 9 | ! INTRODUCES CLOUD EFFECTS ON LONGWAVE FLUXES OR |
|---|
| 10 | ! RADIANCES |
|---|
| 11 | ! |
|---|
| 12 | !** INTERFACE. |
|---|
| 13 | ! ---------- |
|---|
| 14 | ! |
|---|
| 15 | ! EXPLICIT ARGUMENTS : |
|---|
| 16 | ! -------------------- |
|---|
| 17 | ! ==== INPUTS === |
|---|
| 18 | ! PBINT : (KLON,KLEV+1) ; HALF LEVEL PLANCK FUNCTION |
|---|
| 19 | ! PBSUIN : (KLON) ; SURFACE PLANCK FUNCTION |
|---|
| 20 | ! PCLDLD : (KLON,KLEV) ; DOWNWARD EFFECTIVE CLOUD FRACTION |
|---|
| 21 | ! PCLDLU : (KLON,KLEV) ; UPWARD EFFECTIVE CLOUD FRACTION |
|---|
| 22 | ! PCNTRB : (KLON,KLEV+1,KLEV+1); CLEAR-SKY ENERGY EXCHANGE |
|---|
| 23 | ! PEMIS : (KLON) ; SURFACE EMISSIVITY |
|---|
| 24 | ! PFDN : (KLON,KLEV+1) ; CLEAR-SKY DOWNWARD FLUX |
|---|
| 25 | ! PFUP : (KLON,KLEV+1) ; CLEAR-SKY UPWARD FLUX |
|---|
| 26 | ! ==== OUTPUTS === |
|---|
| 27 | ! PFLUX(KLON,2,KLEV) ; RADIATIVE FLUXES : |
|---|
| 28 | ! 1 ==> UPWARD FLUX TOTAL |
|---|
| 29 | ! 2 ==> DOWNWARD FLUX TOTAL |
|---|
| 30 | ! |
|---|
| 31 | ! IMPLICIT ARGUMENTS : NONE |
|---|
| 32 | ! -------------------- |
|---|
| 33 | ! |
|---|
| 34 | ! METHOD. |
|---|
| 35 | ! ------- |
|---|
| 36 | ! |
|---|
| 37 | ! 1. INITIALIZES ALL FLUXES TO CLEAR-SKY VALUES |
|---|
| 38 | ! 2. EFFECT OF ONE OVERCAST UNITY EMISSIVITY CLOUD LAYER |
|---|
| 39 | ! 3. EFFECT OF SEMI-TRANSPARENT, PARTIAL OR MULTI-LAYERED |
|---|
| 40 | ! CLOUDS |
|---|
| 41 | ! |
|---|
| 42 | ! EXTERNALS. |
|---|
| 43 | ! ---------- |
|---|
| 44 | ! |
|---|
| 45 | ! NONE |
|---|
| 46 | ! |
|---|
| 47 | ! REFERENCE. |
|---|
| 48 | ! ---------- |
|---|
| 49 | ! |
|---|
| 50 | ! SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
|---|
| 51 | ! ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS |
|---|
| 52 | ! |
|---|
| 53 | ! AUTHOR. |
|---|
| 54 | ! ------- |
|---|
| 55 | ! JEAN-JACQUES MORCRETTE *ECMWF* |
|---|
| 56 | ! |
|---|
| 57 | ! MODIFICATIONS. |
|---|
| 58 | ! -------------- |
|---|
| 59 | ! ORIGINAL : 89-07-14 |
|---|
| 60 | !----------------------------------------------------------------------- |
|---|
| 61 | |
|---|
| 62 | #include "tsmbkind.h" |
|---|
| 63 | |
|---|
| 64 | USE YOERAD , ONLY : NOVLP |
|---|
| 65 | USE YOERDI , ONLY : REPCLC |
|---|
| 66 | USE YOEDBUG , ONLY : LDEBUG |
|---|
| 67 | |
|---|
| 68 | |
|---|
| 69 | IMPLICIT NONE |
|---|
| 70 | |
|---|
| 71 | |
|---|
| 72 | |
|---|
| 73 | ! DUMMY INTEGER SCALARS |
|---|
| 74 | INTEGER_M :: KFDIA |
|---|
| 75 | INTEGER_M :: KIDIA |
|---|
| 76 | INTEGER_M :: KLEV |
|---|
| 77 | INTEGER_M :: KLON |
|---|
| 78 | |
|---|
| 79 | !----------------------------------------------------------------------- |
|---|
| 80 | ! |
|---|
| 81 | !* 0.1 ARGUMENTS |
|---|
| 82 | ! --------- |
|---|
| 83 | ! |
|---|
| 84 | REAL_B :: PBINT(KLON,KLEV+1),PBSUIN(KLON),PCLDLD(KLON,KLEV) & |
|---|
| 85 | & , PCLDLU(KLON,KLEV) & |
|---|
| 86 | & , PCNTRB(KLON,KLEV+1,KLEV+1) & |
|---|
| 87 | & , PFDN(KLON,KLEV+1),PFUP(KLON,KLEV+1) & |
|---|
| 88 | & , PEMIS(KLON) |
|---|
| 89 | ! |
|---|
| 90 | REAL_B :: PFLUX(KLON,2,KLEV+1) |
|---|
| 91 | ! |
|---|
| 92 | !----------------------------------------------------------------------- |
|---|
| 93 | ! |
|---|
| 94 | !* 0.2 LOCAL ARRAYS |
|---|
| 95 | ! ------------ |
|---|
| 96 | ! |
|---|
| 97 | INTEGER_M :: IMX(KLON), IMXP(KLON) |
|---|
| 98 | ! |
|---|
| 99 | REAL_B :: ZCLEAR(KLON),ZCLOUD(KLON),ZDNF(KLON,KLEV+1,KLEV+1) & |
|---|
| 100 | & , ZFD(KLON), ZFN10(KLON), ZFU(KLON) & |
|---|
| 101 | & , ZUPF(KLON,KLEV+1,KLEV+1) & |
|---|
| 102 | & , ZCLM(KLON,KLEV+1,KLEV+1) |
|---|
| 103 | ! |
|---|
| 104 | ! LOCAL INTEGER SCALARS |
|---|
| 105 | INTEGER_M :: IKCP1, IKM1, IKP1, IMAXC, IMXM1, IMXP1, JCLOUD,& |
|---|
| 106 | &JK, JK1, JK2, JKJ, JL, IMX1, IMX2, JKC, JKCP1, JKM1, JKP1 |
|---|
| 107 | |
|---|
| 108 | ! LOCAL REAL SCALARS |
|---|
| 109 | REAL_B :: ZCFRAC |
|---|
| 110 | |
|---|
| 111 | ! ------------------------------------------------------------------ |
|---|
| 112 | ! |
|---|
| 113 | !* 1. INITIALIZATION |
|---|
| 114 | ! -------------- |
|---|
| 115 | ! |
|---|
| 116 | IMAXC = 0 |
|---|
| 117 | ! |
|---|
| 118 | DO JL = KIDIA,KFDIA |
|---|
| 119 | IMX(JL)=0 |
|---|
| 120 | IMXP(JL)=0 |
|---|
| 121 | ZCLOUD(JL) = 0. |
|---|
| 122 | END DO |
|---|
| 123 | ! |
|---|
| 124 | !* 1.1 SEARCH THE LAYER INDEX OF THE HIGHEST CLOUD |
|---|
| 125 | ! ------------------------------------------- |
|---|
| 126 | ! |
|---|
| 127 | DO JK = 1 , KLEV |
|---|
| 128 | DO JL = KIDIA,KFDIA |
|---|
| 129 | IMX1=IMX(JL) |
|---|
| 130 | IMX2=JK |
|---|
| 131 | IF (PCLDLU(JL,JK).GT.REPCLC) THEN |
|---|
| 132 | IMXP(JL)=IMX2 |
|---|
| 133 | ELSE |
|---|
| 134 | IMXP(JL)=IMX1 |
|---|
| 135 | END IF |
|---|
| 136 | IMAXC=MAX(IMXP(JL),IMAXC) |
|---|
| 137 | IMX(JL)=IMXP(JL) |
|---|
| 138 | END DO |
|---|
| 139 | END DO |
|---|
| 140 | !CGM******* |
|---|
| 141 | IMAXC=KLEV |
|---|
| 142 | !CGM******* |
|---|
| 143 | ! |
|---|
| 144 | DO JK = 1 , KLEV+1 |
|---|
| 145 | DO JL = KIDIA,KFDIA |
|---|
| 146 | PFLUX(JL,1,JK) = PFUP(JL,JK) |
|---|
| 147 | PFLUX(JL,2,JK) = PFDN(JL,JK) |
|---|
| 148 | END DO |
|---|
| 149 | END DO |
|---|
| 150 | ! |
|---|
| 151 | ! ------------------------------------------------------------------ |
|---|
| 152 | ! |
|---|
| 153 | !* 2. EFFECT OF CLOUDINESS ON LONGWAVE FLUXES |
|---|
| 154 | ! --------------------------------------- |
|---|
| 155 | ! |
|---|
| 156 | IF (IMAXC.GT.0) THEN |
|---|
| 157 | ! |
|---|
| 158 | IMXP1 = IMAXC + 1 |
|---|
| 159 | IMXM1 = IMAXC - 1 |
|---|
| 160 | ! |
|---|
| 161 | !* 2.0 INITIALIZE TO CLEAR-SKY FLUXES |
|---|
| 162 | ! ------------------------------ |
|---|
| 163 | ! |
|---|
| 164 | DO JK1=1,KLEV+1 |
|---|
| 165 | DO JK2=1,KLEV+1 |
|---|
| 166 | DO JL = KIDIA,KFDIA |
|---|
| 167 | ZUPF(JL,JK2,JK1)=PFUP(JL,JK1) |
|---|
| 168 | ZDNF(JL,JK2,JK1)=PFDN(JL,JK1) |
|---|
| 169 | END DO |
|---|
| 170 | END DO |
|---|
| 171 | END DO |
|---|
| 172 | ! |
|---|
| 173 | !* 2.1 FLUXES FOR ONE OVERCAST UNITY EMISSIVITY CLOUD |
|---|
| 174 | ! ---------------------------------------------- |
|---|
| 175 | ! |
|---|
| 176 | DO JKC = 1 , IMAXC |
|---|
| 177 | JCLOUD=JKC |
|---|
| 178 | JKCP1=JCLOUD+1 |
|---|
| 179 | ! |
|---|
| 180 | !* 2.1.1 ABOVE THE CLOUD |
|---|
| 181 | ! --------------- |
|---|
| 182 | ! |
|---|
| 183 | DO JK=JKCP1,KLEV+1 |
|---|
| 184 | JKM1=JK-1 |
|---|
| 185 | DO JL = KIDIA,KFDIA |
|---|
| 186 | ZFU(JL)=0. |
|---|
| 187 | END DO |
|---|
| 188 | IF (JK .GT. JKCP1) THEN |
|---|
| 189 | DO JKJ=JKCP1,JKM1 |
|---|
| 190 | DO JL = KIDIA,KFDIA |
|---|
| 191 | ZFU(JL) = ZFU(JL) + PCNTRB(JL,JK,JKJ) |
|---|
| 192 | END DO |
|---|
| 193 | END DO |
|---|
| 194 | END IF |
|---|
| 195 | ! |
|---|
| 196 | DO JL = KIDIA,KFDIA |
|---|
| 197 | ZUPF(JL,JKCP1,JK)=PBINT(JL,JK)-ZFU(JL) |
|---|
| 198 | END DO |
|---|
| 199 | END DO |
|---|
| 200 | ! |
|---|
| 201 | !* 2.1.2 BELOW THE CLOUD |
|---|
| 202 | ! --------------- |
|---|
| 203 | ! |
|---|
| 204 | DO JK=1,JCLOUD |
|---|
| 205 | JKP1=JK+1 |
|---|
| 206 | DO JL = KIDIA,KFDIA |
|---|
| 207 | ZFD(JL)=0. |
|---|
| 208 | END DO |
|---|
| 209 | ! |
|---|
| 210 | IF (JK .LT. JCLOUD) THEN |
|---|
| 211 | DO JKJ=JKP1,JCLOUD |
|---|
| 212 | DO JL = KIDIA,KFDIA |
|---|
| 213 | ZFD(JL) = ZFD(JL) + PCNTRB(JL,JK,JKJ) |
|---|
| 214 | END DO |
|---|
| 215 | END DO |
|---|
| 216 | END IF |
|---|
| 217 | DO JL = KIDIA,KFDIA |
|---|
| 218 | ZDNF(JL,JKCP1,JK)=-PBINT(JL,JK)-ZFD(JL) |
|---|
| 219 | END DO |
|---|
| 220 | END DO |
|---|
| 221 | ! |
|---|
| 222 | END DO |
|---|
| 223 | ! |
|---|
| 224 | ! |
|---|
| 225 | !* 2.2 CLOUD COVER MATRIX |
|---|
| 226 | ! ------------------ |
|---|
| 227 | ! |
|---|
| 228 | !* ZCLM(JK1,JK2) IS THE OBSCURATION FACTOR BY CLOUD LAYERS BETWEEN |
|---|
| 229 | ! HALF-LEVELS JK1 AND JK2 AS SEEN FROM JK1 |
|---|
| 230 | ! |
|---|
| 231 | DO JK1 = 1 , KLEV+1 |
|---|
| 232 | DO JK2 = 1 , KLEV+1 |
|---|
| 233 | DO JL = KIDIA,KFDIA |
|---|
| 234 | ZCLM(JL,JK1,JK2) = 0. |
|---|
| 235 | END DO |
|---|
| 236 | END DO |
|---|
| 237 | END DO |
|---|
| 238 | ! |
|---|
| 239 | ! |
|---|
| 240 | ! |
|---|
| 241 | !* 2.4 CLOUD COVER BELOW THE LEVEL OF CALCULATION |
|---|
| 242 | ! ------------------------------------------ |
|---|
| 243 | ! |
|---|
| 244 | DO JK1 = 2 , KLEV+1 |
|---|
| 245 | DO JL = KIDIA,KFDIA |
|---|
| 246 | ZCLEAR(JL)=1. |
|---|
| 247 | ZCLOUD(JL)=0. |
|---|
| 248 | END DO |
|---|
| 249 | DO JK = JK1 - 1 , 1 , -1 |
|---|
| 250 | DO JL = KIDIA,KFDIA |
|---|
| 251 | IF (NOVLP.EQ.1) THEN |
|---|
| 252 | !* maximum-random |
|---|
| 253 | ZCLEAR(JL)=ZCLEAR(JL)*(1.0-MAX(PCLDLU(JL,JK),ZCLOUD(JL))) & |
|---|
| 254 | & /(1.0-MIN(ZCLOUD(JL),1.-REPCLC)) |
|---|
| 255 | ZCLM(JL,JK1,JK) = 1.0 - ZCLEAR(JL) |
|---|
| 256 | ZCLOUD(JL) = PCLDLU(JL,JK) |
|---|
| 257 | ELSE IF (NOVLP.EQ.2) THEN |
|---|
| 258 | !* maximum |
|---|
| 259 | ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLU(JL,JK)) |
|---|
| 260 | ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
|---|
| 261 | ELSE IF (NOVLP.EQ.3) THEN |
|---|
| 262 | !* random |
|---|
| 263 | ZCLEAR(JL) = ZCLEAR(JL)*(1.0 - PCLDLU(JL,JK)) |
|---|
| 264 | ZCLOUD(JL) = 1.0 - ZCLEAR(JL) |
|---|
| 265 | ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
|---|
| 266 | END IF |
|---|
| 267 | END DO |
|---|
| 268 | END DO |
|---|
| 269 | END DO |
|---|
| 270 | ! |
|---|
| 271 | ! |
|---|
| 272 | !* 2.5 CLOUD COVER ABOVE THE LEVEL OF CALCULATION |
|---|
| 273 | ! ------------------------------------------ |
|---|
| 274 | ! |
|---|
| 275 | DO JK1 = 1 , KLEV |
|---|
| 276 | DO JL = KIDIA,KFDIA |
|---|
| 277 | ZCLEAR(JL)=1. |
|---|
| 278 | ZCLOUD(JL)=0. |
|---|
| 279 | END DO |
|---|
| 280 | DO JK = JK1 , KLEV |
|---|
| 281 | DO JL = KIDIA,KFDIA |
|---|
| 282 | IF (NOVLP.EQ.1) THEN |
|---|
| 283 | !* maximum-random |
|---|
| 284 | ZCLEAR(JL)=ZCLEAR(JL)*(1.0-MAX(PCLDLD(JL,JK),ZCLOUD(JL))) & |
|---|
| 285 | & /(1.0-MIN(ZCLOUD(JL),1.-REPCLC)) |
|---|
| 286 | ZCLM(JL,JK1,JK) = 1.0 - ZCLEAR(JL) |
|---|
| 287 | ZCLOUD(JL) = PCLDLD(JL,JK) |
|---|
| 288 | ELSE IF (NOVLP.EQ.2) THEN |
|---|
| 289 | !* maximum |
|---|
| 290 | ZCLOUD(JL) = MAX(ZCLOUD(JL) , PCLDLD(JL,JK)) |
|---|
| 291 | ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
|---|
| 292 | ELSE IF (NOVLP.EQ.3) THEN |
|---|
| 293 | !* random |
|---|
| 294 | ZCLEAR(JL) = ZCLEAR(JL)*(1.0 - PCLDLD(JL,JK)) |
|---|
| 295 | ZCLOUD(JL) = 1.0 - ZCLEAR(JL) |
|---|
| 296 | ZCLM(JL,JK1,JK) = ZCLOUD(JL) |
|---|
| 297 | END IF |
|---|
| 298 | END DO |
|---|
| 299 | END DO |
|---|
| 300 | END DO |
|---|
| 301 | ! |
|---|
| 302 | ! |
|---|
| 303 | ! |
|---|
| 304 | !* 3. FLUXES FOR PARTIAL/MULTIPLE LAYERED CLOUDINESS |
|---|
| 305 | ! ---------------------------------------------- |
|---|
| 306 | ! |
|---|
| 307 | !* 3.1 DOWNWARD FLUXES |
|---|
| 308 | ! --------------- |
|---|
| 309 | ! |
|---|
| 310 | DO JL = KIDIA,KFDIA |
|---|
| 311 | PFLUX(JL,2,KLEV+1) = 0. |
|---|
| 312 | END DO |
|---|
| 313 | ! |
|---|
| 314 | DO JK1 = KLEV , 1 , -1 |
|---|
| 315 | ! |
|---|
| 316 | !* CONTRIBUTION FROM CLEAR-SKY FRACTION |
|---|
| 317 | ! |
|---|
| 318 | DO JL = KIDIA,KFDIA |
|---|
| 319 | ZFD (JL) = (1. - ZCLM(JL,JK1,KLEV)) * ZDNF(JL,1,JK1) |
|---|
| 320 | ! |
|---|
| 321 | !* CONTRIBUTION FROM ADJACENT CLOUD |
|---|
| 322 | ! |
|---|
| 323 | ZFD(JL) = ZFD(JL) + ZCLM(JL,JK1,JK1) * ZDNF(JL,JK1+1,JK1) |
|---|
| 324 | END DO |
|---|
| 325 | ! |
|---|
| 326 | !* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
|---|
| 327 | ! |
|---|
| 328 | DO JK = KLEV-1 , JK1 , -1 |
|---|
| 329 | DO JL = KIDIA,KFDIA |
|---|
| 330 | ZCFRAC = ZCLM(JL,JK1,JK+1) - ZCLM(JL,JK1,JK) |
|---|
| 331 | ZFD(JL) = ZFD(JL) + ZCFRAC * ZDNF(JL,JK+2,JK1) |
|---|
| 332 | END DO |
|---|
| 333 | END DO |
|---|
| 334 | ! |
|---|
| 335 | DO JL = KIDIA,KFDIA |
|---|
| 336 | PFLUX(JL,2,JK1) = ZFD (JL) |
|---|
| 337 | END DO |
|---|
| 338 | ! |
|---|
| 339 | END DO |
|---|
| 340 | ! |
|---|
| 341 | ! |
|---|
| 342 | ! |
|---|
| 343 | ! |
|---|
| 344 | !* 3.2 UPWARD FLUX AT THE SURFACE |
|---|
| 345 | ! -------------------------- |
|---|
| 346 | ! |
|---|
| 347 | DO JL = KIDIA,KFDIA |
|---|
| 348 | PFLUX(JL,1,1) = PEMIS(JL)*PBSUIN(JL)-(1.-PEMIS(JL))*PFLUX(JL,2,1) |
|---|
| 349 | END DO |
|---|
| 350 | ! |
|---|
| 351 | ! |
|---|
| 352 | ! |
|---|
| 353 | !* 3.3 UPWARD FLUXES |
|---|
| 354 | ! ------------- |
|---|
| 355 | ! |
|---|
| 356 | DO JK1 = 2 , KLEV+1 |
|---|
| 357 | ! |
|---|
| 358 | !* CONTRIBUTION FROM CLEAR-SKY FRACTION |
|---|
| 359 | ! |
|---|
| 360 | DO JL = KIDIA,KFDIA |
|---|
| 361 | ZFU (JL) = (1. - ZCLM(JL,JK1,1)) * ZUPF(JL,1,JK1) |
|---|
| 362 | ! |
|---|
| 363 | !* CONTRIBUTION FROM ADJACENT CLOUD |
|---|
| 364 | ! |
|---|
| 365 | ZFU(JL) = ZFU(JL) + ZCLM(JL,JK1,JK1-1) * ZUPF(JL,JK1,JK1) |
|---|
| 366 | END DO |
|---|
| 367 | ! |
|---|
| 368 | !* CONTRIBUTION FROM OTHER CLOUDY FRACTIONS |
|---|
| 369 | ! |
|---|
| 370 | DO JK = 2 , JK1-1 |
|---|
| 371 | DO JL = KIDIA,KFDIA |
|---|
| 372 | ZCFRAC = ZCLM(JL,JK1,JK-1) - ZCLM(JL,JK1,JK) |
|---|
| 373 | ZFU(JL) = ZFU(JL) + ZCFRAC * ZUPF(JL,JK ,JK1) |
|---|
| 374 | END DO |
|---|
| 375 | END DO |
|---|
| 376 | ! |
|---|
| 377 | DO JL = KIDIA,KFDIA |
|---|
| 378 | PFLUX(JL,1,JK1) = ZFU (JL) |
|---|
| 379 | END DO |
|---|
| 380 | ! |
|---|
| 381 | END DO |
|---|
| 382 | ! |
|---|
| 383 | ! |
|---|
| 384 | END IF |
|---|
| 385 | ! |
|---|
| 386 | ! |
|---|
| 387 | !* 2.3 END OF CLOUD EFFECT COMPUTATIONS |
|---|
| 388 | ! |
|---|
| 389 | !---------------------------------------------------------------------- |
|---|
| 390 | RETURN |
|---|
| 391 | END SUBROUTINE OLWC |
|---|
