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#ifdef RS6K |
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@PROCESS HOT NOSTRICT |
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#endif |
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SUBROUTINE SRTM_REFTRA & |
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& ( KLEV , KMODTS, & |
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& LDRTCHK, & |
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& PGG , PRMUZ, PTAU , PW, & |
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& PREF , PREFD, PTRA , PTRAD & |
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& ) |
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!**** *SRTM_REFTRA* - REFLECTIVITY AND TRANSMISSIVITY |
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! PURPOSE. |
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! -------- |
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! COMPUTES THE REFLECTIVITY AND TRANSMISSIVITY OF A CLEAR OR |
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! CLOUDY LAYER USING A CHOICE OF VARIOUS APPROXIMATIONS. |
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!** INTERFACE. |
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! ---------- |
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! *SRTM_REFTRA* IS CALLED BY *SRTM_SPCVRT* |
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! EXPLICIT ARGUMENTS : |
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! -------------------- |
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! INPUTS |
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! ------ |
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! KMODTS = 1 EDDINGTON (JOSEPH ET AL., 1976) |
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! = 2 PIFM (ZDUNKOWSKI ET AL., 1980) |
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! = 3 DISCRETE ORDINATES (LIOU, 1973) |
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! LDRTCHK = .T. IF CLOUDY |
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! = .F. IF CLEAR-SKY |
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! PGG = ASSYMETRY FACTOR |
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! PRMUZ = COSINE SOLAR ZENITH ANGLE |
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! PTAU = OPTICAL THICKNESS |
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! PW = SINGLE SCATTERING ALBEDO |
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! OUTPUTS |
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! ------- |
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! PREF : COLLIMATED BEAM REFLECTIVITY |
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! PREFD : DIFFUSE BEAM REFLECTIVITY |
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! PTRA : COLLIMATED BEAM TRANSMISSIVITY |
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! PTRAD : DIFFUSE BEAM TRANSMISSIVITY |
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! METHOD. |
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! ------- |
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! STANDARD DELTA-EDDINGTON, P.I.F.M., OR D.O.M. LAYER CALCULATIONS. |
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! EXTERNALS. |
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! ---------- |
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! NONE |
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! REFERENCE. |
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! ---------- |
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! AUTHOR. |
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! ------- |
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! JEAN-JACQUES MORCRETTE *ECMWF* |
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! MODIFICATIONS. |
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! -------------- |
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! ORIGINAL : 03-02-27 |
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! M.Hamrud 01-Oct-2003 CY28 Cleaning |
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! Mike Iacono, AER, Mar 2004: bug fix |
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! ------------------------------------------------------------------ |
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!* 0.1 ARGUMENTS |
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! --------- |
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USE PARKIND1 ,ONLY : JPIM ,JPRB |
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USE YOMHOOK ,ONLY : LHOOK, DR_HOOK |
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USE PARSRTM , ONLY : JPLAY |
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!USE YOESW , ONLY : NDBUG |
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USE YOERDU , ONLY : REPLOG |
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IMPLICIT NONE |
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INTEGER(KIND=JPIM),INTENT(IN) :: KLEV |
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INTEGER(KIND=JPIM),INTENT(OUT) :: KMODTS |
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LOGICAL ,INTENT(IN) :: LDRTCHK(JPLAY) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PGG(JPLAY) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PRMUZ |
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REAL(KIND=JPRB) ,INTENT(IN) :: PTAU(JPLAY) |
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REAL(KIND=JPRB) ,INTENT(IN) :: PW(JPLAY) |
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REAL(KIND=JPRB) ,INTENT(INOUT) :: PREF(JPLAY) |
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REAL(KIND=JPRB) ,INTENT(INOUT) :: PREFD(JPLAY) |
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REAL(KIND=JPRB) ,INTENT(INOUT) :: PTRA(JPLAY) |
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REAL(KIND=JPRB) ,INTENT(INOUT) :: PTRAD(JPLAY) |
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! ------------------------------------------------------------------ |
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INTEGER(KIND=JPIM) :: JK |
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REAL(KIND=JPRB) :: ZA, ZA1, ZA2 |
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REAL(KIND=JPRB) :: ZBETA, ZDEND, ZDENR, ZDENT |
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REAL(KIND=JPRB) :: ZE1, ZE2, ZEM1, ZEM2, ZEMM, ZEP1, ZEP2 |
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REAL(KIND=JPRB) :: ZG, ZG3, ZGAMMA1, ZGAMMA2, ZGAMMA3, ZGAMMA4, ZGT |
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REAL(KIND=JPRB) :: ZR1, ZR2, ZR3, ZR4, ZR5, ZRK, ZRK2, ZRKG, ZRM1, ZRP, ZRP1, ZRPP |
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REAL(KIND=JPRB) :: ZSR3, ZT1, ZT2, ZT3, ZT4, ZT5, ZTO1 |
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REAL(KIND=JPRB) :: ZW, ZWCRIT, ZWO |
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REAL(KIND=JPRB) :: ZHOOK_HANDLE,EXP500,ZTEMP |
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! ------------------------------------------------------------------ |
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IF (LHOOK) CALL DR_HOOK('SRTM_REFTRA',0,ZHOOK_HANDLE) |
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EXP500=EXP(500.0_JPRB) |
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ZSR3=SQRT(3._JPRB) |
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ZWCRIT=0.9995_JPRB |
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KMODTS=2 |
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!NDBUG=3 |
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DO JK=1,KLEV |
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! if (NDBUG < 2) then |
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! print 9000,JK,LRTCHK(JK),PTAU(JK),PW(JK),PGG(JK),PRMUZ |
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9000 format(1x,'SRTM_REFTRA:inputs:',I3,L8,4E13.6) |
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! end if |
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IF (.NOT.LDRTCHK(JK)) THEN |
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PREF(JK) =0.0_JPRB |
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PTRA(JK) =1.0_JPRB |
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PREFD(JK)=0.0_JPRB |
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PTRAD(JK)=1.0_JPRB |
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! if (NDBUG < 2) then |
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! print 9001,JL,JK,PREF(JK),PTRA(JK),PREFD(JK),PTRAD(JK) |
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9001 format(1x,'SRTM_REFTRA:not.LRTCKH:',2I3,4F10.6) |
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! end if |
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ELSE |
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ZTO1=PTAU(JK) |
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ZW =PW(JK) |
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ZG =PGG(JK) |
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!-- GENERAL TWO-STREAM EXPRESSIONS |
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ZG3= 3._JPRB * ZG |
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IF (KMODTS == 1) THEN |
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ZGAMMA1= (7._JPRB - ZW * (4._JPRB + ZG3)) * 0.25_JPRB |
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ZGAMMA2=-(1._JPRB - ZW * (4._JPRB - ZG3)) * 0.25_JPRB |
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ZGAMMA3= (2._JPRB - ZG3 * PRMUZ ) * 0.25_JPRB |
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ELSEIF (KMODTS == 2) THEN |
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ZGAMMA1= (8._JPRB - ZW * (5._JPRB + ZG3)) * 0.25_JPRB |
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ZGAMMA2= 3._JPRB *(ZW * (1._JPRB - ZG )) * 0.25_JPRB |
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ZGAMMA3= (2._JPRB - ZG3 * PRMUZ ) * 0.25_JPRB |
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ELSEIF (KMODTS == 3) THEN |
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ZGAMMA1= ZSR3 * (2._JPRB - ZW * (1._JPRB + ZG)) * 0.5_JPRB |
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ZGAMMA2= ZSR3 * ZW * (1._JPRB - ZG ) * 0.5_JPRB |
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ZGAMMA3= (1._JPRB - ZSR3 * ZG * PRMUZ ) * 0.5_JPRB |
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ENDIF |
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ZGAMMA4= 1._JPRB - ZGAMMA3 |
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!-- RECOMPUTE ORIGINAL S.S.A. TO TEST FOR CONSERVATIVE SOLUTION |
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ZWO= ZW / (1._JPRB - (1._JPRB - ZW) * (ZG / (1._JPRB - ZG))**2) |
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! ZTEMP=(1._JPRB - ZG)**2 |
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! ZWO= ZW*ZTEMP/ (ZTEMP - (1._JPRB - ZW)*(ZG **2)) |
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IF (ZWO >= ZWCRIT) THEN |
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!!-- conservative scattering |
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ZA = ZGAMMA1 * PRMUZ |
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ZA1 = ZA - ZGAMMA3 |
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ZGT = ZGAMMA1 * ZTO1 |
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!-- Homogeneous reflectance and transmittance |
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! collimated beam |
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ZE1 = MIN ( ZTO1 / PRMUZ , 500._JPRB) |
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ZE2 = EXP ( - ZE1 ) |
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ZTEMP=1.0_JPRB/(1._JPRB + ZGT) |
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PREF(JK) = (ZGT - ZA1 * (1._JPRB - ZE2)) *ZTEMP |
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PTRA(JK) = 1._JPRB - PREF(JK) |
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! isotropic incidence |
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PREFD(JK) = ZGT *ZTEMP |
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PTRAD(JK) = 1._JPRB - PREFD(JK) |
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! if (NDBUG < 2) then |
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! print 9002,JL,JK,PREF(JK),PTRA(JK),PREFD(JK),PTRAD(JK) |
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9002 format(1x,'SRTM_REFTRA: consrv: LDRTCHK:',2I3,4F10.6) |
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! end if |
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ELSE |
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!-- non-conservative scattering |
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ZA1 = ZGAMMA1 * ZGAMMA4 + ZGAMMA2 * ZGAMMA3 |
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ZA2 = ZGAMMA1 * ZGAMMA3 + ZGAMMA2 * ZGAMMA4 |
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! ZRK = SQRT ( ZGAMMA1**2 - ZGAMMA2**2) |
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ZRK = SQRT ( MAX ( REPLOG, ZGAMMA1**2 - ZGAMMA2**2) ) |
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ZRP = ZRK * PRMUZ |
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ZRP1 = 1._JPRB + ZRP |
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ZRM1 = 1._JPRB - ZRP |
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ZRK2 = 2._JPRB * ZRK |
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ZRPP = 1._JPRB - ZRP*ZRP |
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ZRKG = ZRK + ZGAMMA1 |
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ZR1 = ZRM1 * (ZA2 + ZRK * ZGAMMA3) |
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ZR2 = ZRP1 * (ZA2 - ZRK * ZGAMMA3) |
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ZR3 = ZRK2 * (ZGAMMA3 - ZA2 * PRMUZ ) |
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ZR4 = ZRPP * ZRKG |
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ZR5 = ZRPP * (ZRK - ZGAMMA1) |
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ZT1 = ZRP1 * (ZA1 + ZRK * ZGAMMA4) |
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ZT2 = ZRM1 * (ZA1 - ZRK * ZGAMMA4) |
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ZT3 = ZRK2 * (ZGAMMA4 + ZA1 * PRMUZ ) |
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ZT4 = ZR4 |
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ZT5 = ZR5 |
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ZBETA = - ZR5 / ZR4 |
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!-- Homogeneous reflectance and transmittance |
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IF(ZRK * ZTO1 > 500._JPRB)THEN |
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ZEP1=EXP500 |
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ELSE |
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ZEP1=EXP(ZRK * ZTO1) |
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ENDIF |
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ZEM1=1.0_JPRB/ZEP1 |
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IF(ZTO1 > 500._JPRB*PRMUZ)THEN |
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ZEP2=EXP500 |
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ELSE |
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ZEP2=EXP(ZTO1 / PRMUZ) |
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ENDIF |
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ZEM2=1.0_JPRB/ZEP2 |
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! ZE1 = MIN ( ZRK * ZTO1, 500._JPRB) |
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! ZE2 = MIN ( ZTO1 / PRMUZ , 500._JPRB) |
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! ZEP1 = EXP( ZE1 ) |
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! ZEM1 = EXP(-ZE1 ) |
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! ZEM1=1.0_JPRB/ZEP1 |
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! ZEP2 = EXP( ZE2 ) |
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! ZEM2 = EXP(-ZE2 ) |
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! ZEM2=1.0_JPRB/ZEP2 |
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! collimated beam |
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ZDENR = ZR4*ZEP1 + ZR5*ZEM1 |
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!- bug noticed by Mike Iacono |
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! PREF(JK) = ZWO * (ZR1*ZEP1 - ZR2*ZEM1 - ZR3*ZEM2) / ZDENR |
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PREF(JK) = ZW * (ZR1*ZEP1 - ZR2*ZEM1 - ZR3*ZEM2) / ZDENR |
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ZDENT = ZT4*ZEP1 + ZT5*ZEM1 |
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!- bug noticed by Mike Iacono |
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! PTRA(JK) = ZEM2 * (1._JPRB - ZWO * (ZT1*ZEP1 - ZT2*ZEM1 - ZT3*ZEP2) / ZDENT) |
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PTRA(JK) = ZEM2 * (1._JPRB - ZW * (ZT1*ZEP1 - ZT2*ZEM1 - ZT3*ZEP2) / ZDENT) |
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! diffuse beam |
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ZEMM = ZEM1*ZEM1 |
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ZDEND = 1._JPRB / ( (1._JPRB - ZBETA*ZEMM ) * ZRKG) |
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PREFD(JK) = ZGAMMA2 * (1._JPRB - ZEMM) * ZDEND |
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PTRAD(JK) = ZRK2*ZEM1*ZDEND |
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! if (NDBUG < 2) then |
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! print 9003,JL,JK,PREF(JK),PTRA(JK),PREFD(JK),PTRAD(JK) |
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9003 format(1x,'SRTM_REFTRA: OMG<1: LDRTCHK:',2I3,4F10.6) |
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! end if |
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ENDIF |
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ENDIF |
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ENDDO |
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! ------------------------------------------------------------------ |
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IF (LHOOK) CALL DR_HOOK('SRTM_REFTRA',1,ZHOOK_HANDLE) |
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END SUBROUTINE SRTM_REFTRA |