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SUBROUTINE LWTT(PGA,PGB,PUU, PTT) |
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use dimens_m |
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use dimphy |
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use raddim |
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use raddimlw |
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IMPLICIT none |
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C |
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C----------------------------------------------------------------------- |
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C PURPOSE. |
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C -------- |
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C THIS ROUTINE COMPUTES THE TRANSMISSION FUNCTIONS FOR ALL THE |
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C ABSORBERS (H2O, UNIFORMLY MIXED GASES, AND O3) IN ALL SIX SPECTRAL |
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C INTERVALS. |
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C |
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C METHOD. |
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C ------- |
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C |
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C 1. TRANSMISSION FUNCTION BY H2O AND UNIFORMLY MIXED GASES ARE |
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C COMPUTED USING PADE APPROXIMANTS AND HORNER'S ALGORITHM. |
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C 2. TRANSMISSION BY O3 IS EVALUATED WITH MALKMUS'S BAND MODEL. |
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C 3. TRANSMISSION BY H2O CONTINUUM AND AEROSOLS FOLLOW AN |
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C A SIMPLE EXPONENTIAL DECREASE WITH ABSORBER AMOUNT. |
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C |
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C REFERENCE. |
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C ---------- |
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C |
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C SEE RADIATION'S PART OF THE MODEL'S DOCUMENTATION AND |
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C ECMWF RESEARCH DEPARTMENT DOCUMENTATION OF THE IFS |
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C |
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C AUTHOR. |
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C ------- |
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C JEAN-JACQUES MORCRETTE *ECMWF* |
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C |
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C MODIFICATIONS. |
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C -------------- |
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C ORIGINAL : 88-12-15 |
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C |
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C----------------------------------------------------------------------- |
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REAL*8 O1H, O2H |
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PARAMETER (O1H=2230.) |
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PARAMETER (O2H=100.) |
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REAL*8 RPIALF0 |
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PARAMETER (RPIALF0=2.0) |
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C |
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C* ARGUMENTS: |
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C |
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REAL*8 PUU(KDLON,NUA) |
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REAL*8 PTT(KDLON,NTRA) |
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REAL*8 PGA(KDLON,8,2) |
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REAL*8 PGB(KDLON,8,2) |
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C |
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C* LOCAL VARIABLES: |
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C |
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REAL*8 zz, zxd, zxn |
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REAL*8 zpu, zpu10, zpu11, zpu12, zpu13 |
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REAL*8 zeu, zeu10, zeu11, zeu12, zeu13 |
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REAL*8 zx, zy, zsq1, zsq2, zvxy, zuxy |
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REAL*8 zaercn, zto1, zto2, zxch4, zych4, zxn2o, zyn2o |
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REAL*8 zsqn21, zodn21, zsqh42, zodh42 |
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REAL*8 zsqh41, zodh41, zsqn22, zodn22, zttf11, zttf12 |
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REAL*8 zuu11, zuu12, za11, za12 |
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INTEGER jl, ja |
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C ------------------------------------------------------------------ |
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C |
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C* 1. HORNER'S ALGORITHM FOR H2O AND CO2 TRANSMISSION |
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C ----------------------------------------------- |
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C |
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100 CONTINUE |
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C |
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C |
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DO 130 JA = 1 , 8 |
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DO 120 JL = 1, KDLON |
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ZZ =SQRT(PUU(JL,JA)) |
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c ZXD(JL,1)=PGB( JL, 1,1) + ZZ(JL, 1)*(PGB( JL, 1,2) + ZZ(JL, 1)) |
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c ZXN(JL,1)=PGA( JL, 1,1) + ZZ(JL, 1)*(PGA( JL, 1,2) ) |
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c PTT(JL,1)=ZXN(JL,1)/ZXD(JL,1) |
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ZXD =PGB( JL,JA,1) + ZZ *(PGB( JL,JA,2) + ZZ ) |
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ZXN =PGA( JL,JA,1) + ZZ *(PGA( JL,JA,2) ) |
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PTT(JL,JA)=ZXN /ZXD |
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120 CONTINUE |
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130 CONTINUE |
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C |
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C ------------------------------------------------------------------ |
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C |
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C* 2. CONTINUUM, OZONE AND AEROSOL TRANSMISSION FUNCTIONS |
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C --------------------------------------------------- |
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C |
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200 CONTINUE |
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C |
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DO 201 JL = 1, KDLON |
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PTT(JL, 9) = PTT(JL, 8) |
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C |
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C- CONTINUUM ABSORPTION: E- AND P-TYPE |
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C |
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ZPU = 0.002 * PUU(JL,10) |
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ZPU10 = 112. * ZPU |
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ZPU11 = 6.25 * ZPU |
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ZPU12 = 5.00 * ZPU |
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ZPU13 = 80.0 * ZPU |
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ZEU = PUU(JL,11) |
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ZEU10 = 12. * ZEU |
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ZEU11 = 6.25 * ZEU |
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ZEU12 = 5.00 * ZEU |
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ZEU13 = 80.0 * ZEU |
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C |
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C- OZONE ABSORPTION |
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C |
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ZX = PUU(JL,12) |
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ZY = PUU(JL,13) |
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ZUXY = 4. * ZX * ZX / (RPIALF0 * ZY) |
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ZSQ1 = SQRT(1. + O1H * ZUXY ) - 1. |
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ZSQ2 = SQRT(1. + O2H * ZUXY ) - 1. |
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ZVXY = RPIALF0 * ZY / (2. * ZX) |
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ZAERCN = PUU(JL,17) + ZEU12 + ZPU12 |
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ZTO1 = EXP( - ZVXY * ZSQ1 - ZAERCN ) |
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ZTO2 = EXP( - ZVXY * ZSQ2 - ZAERCN ) |
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C |
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C-- TRACE GASES (CH4, N2O, CFC-11, CFC-12) |
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C |
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C* CH4 IN INTERVAL 800-970 + 1110-1250 CM-1 |
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C |
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c NEXOTIC=1 |
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c IF (NEXOTIC.EQ.1) THEN |
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ZXCH4 = PUU(JL,19) |
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ZYCH4 = PUU(JL,20) |
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ZUXY = 4. * ZXCH4*ZXCH4/(0.103*ZYCH4) |
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ZSQH41 = SQRT(1. + 33.7 * ZUXY) - 1. |
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ZVXY = 0.103 * ZYCH4 / (2. * ZXCH4) |
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ZODH41 = ZVXY * ZSQH41 |
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C |
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C* N2O IN INTERVAL 800-970 + 1110-1250 CM-1 |
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C |
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ZXN2O = PUU(JL,21) |
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ZYN2O = PUU(JL,22) |
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ZUXY = 4. * ZXN2O*ZXN2O/(0.416*ZYN2O) |
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ZSQN21 = SQRT(1. + 21.3 * ZUXY) - 1. |
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ZVXY = 0.416 * ZYN2O / (2. * ZXN2O) |
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ZODN21 = ZVXY * ZSQN21 |
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C |
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C* CH4 IN INTERVAL 1250-1450 + 1880-2820 CM-1 |
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C |
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ZUXY = 4. * ZXCH4*ZXCH4/(0.113*ZYCH4) |
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ZSQH42 = SQRT(1. + 400. * ZUXY) - 1. |
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ZVXY = 0.113 * ZYCH4 / (2. * ZXCH4) |
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ZODH42 = ZVXY * ZSQH42 |
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C |
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C* N2O IN INTERVAL 1250-1450 + 1880-2820 CM-1 |
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C |
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ZUXY = 4. * ZXN2O*ZXN2O/(0.197*ZYN2O) |
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ZSQN22 = SQRT(1. + 2000. * ZUXY) - 1. |
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ZVXY = 0.197 * ZYN2O / (2. * ZXN2O) |
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ZODN22 = ZVXY * ZSQN22 |
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C |
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C* CFC-11 IN INTERVAL 800-970 + 1110-1250 CM-1 |
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C |
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ZA11 = 2. * PUU(JL,23) * 4.404E+05 |
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ZTTF11 = 1. - ZA11 * 0.003225 |
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C |
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C* CFC-12 IN INTERVAL 800-970 + 1110-1250 CM-1 |
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C |
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ZA12 = 2. * PUU(JL,24) * 6.7435E+05 |
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ZTTF12 = 1. - ZA12 * 0.003225 |
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C |
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ZUU11 = - PUU(JL,15) - ZEU10 - ZPU10 |
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ZUU12 = - PUU(JL,16) - ZEU11 - ZPU11 - ZODH41 - ZODN21 |
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PTT(JL,10) = EXP( - PUU(JL,14) ) |
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PTT(JL,11) = EXP( ZUU11 ) |
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PTT(JL,12) = EXP( ZUU12 ) * ZTTF11 * ZTTF12 |
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PTT(JL,13) = 0.7554 * ZTO1 + 0.2446 * ZTO2 |
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PTT(JL,14) = PTT(JL,10) * EXP( - ZEU13 - ZPU13 ) |
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PTT(JL,15) = EXP ( - PUU(JL,14) - ZODH42 - ZODN22 ) |
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201 CONTINUE |
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C |
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RETURN |
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END |
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