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guez |
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module zenang_m |
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IMPLICIT NONE |
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contains |
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SUBROUTINE zenang(longi, gmtime, pdtrad, pmu0, frac) |
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USE dimphy, ONLY : klon |
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USE yomcst, ONLY : r_incl |
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USE phyetat0_m, ONLY : rlat, rlon |
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use nr_util, only: assert, pi |
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! Author : O. Boucher (LMD/CNRS), d'après les routines "zenith" et |
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! "angle" de Z.X. Li |
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! Calcule les valeurs moyennes du cos de l'angle zénithal et |
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! l'ensoleillement moyen entre "gmtime1" et "gmtime2" connaissant la |
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! déclinaison, la latitude et la longitude. |
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! Différent de la routine "angle" en ce sens que "zenang" fournit des |
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! moyennes de "pmu0" et non des valeurs instantanées. |
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! Du coup "frac" prend toutes les valeurs entre 0 et 1. |
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! Date : première version le 13 decembre 1994 |
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! revu pour GCM le 30 septembre 1996 |
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REAL, INTENT (IN):: longi |
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! (longitude vraie de la terre dans son plan solaire a partir de |
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! l'equinoxe de printemps) (in degrees) |
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REAL, INTENT (IN):: gmtime ! temps universel en fraction de jour |
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REAL, INTENT (IN):: pdtrad ! pas de temps du rayonnement (secondes) |
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REAL, INTENT (OUT):: pmu0(:) ! (klon) |
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! (cosine of mean zenith angle between "gmtime" and "gmtime+pdtrad") |
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REAL, INTENT (OUT), OPTIONAL:: frac(:) ! (klon) |
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! (ensoleillement moyen entre gmtime et gmtime+pdtrad) |
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! Variables local to the procedure: |
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INTEGER i |
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REAL gmtime1, gmtime2 |
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REAL deux_pi |
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REAL omega1, omega2, omega |
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! omega1, omega2 : temps 1 et 2 exprimés en radians avec 0 à midi. |
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! omega : heure en radians du coucher de soleil |
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! -omega est donc l'heure en radians de lever du soleil |
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REAL omegadeb, omegafin |
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REAL zfrac1, zfrac2, z1_mu, z2_mu |
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REAL lat_sun ! déclinaison en radians |
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REAL latr ! latitude du point de grille en radians |
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!---------------------------------------------------------------------- |
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if (present(frac)) call assert((/size(pmu0), size(frac)/) == klon, & |
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"zenang") |
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deux_pi = 2*pi |
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lat_sun = asin(sin(longi * pi / 180.) * sin(r_incl * pi / 180.)) |
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! Capderou (2003 #784, équation 4.49) |
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gmtime1 = gmtime*86400. |
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gmtime2 = gmtime*86400. + pdtrad |
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DO i = 1, klon |
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latr = rlat(i)*pi/180. |
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omega = 0.0 !--nuit polaire |
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IF (latr>=(pi/2.-lat_sun) .OR. latr<=(-pi/2.-lat_sun)) THEN |
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omega = pi ! journee polaire |
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END IF |
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IF (latr<(pi/2.+lat_sun) .AND. latr>(-pi/2.+lat_sun) .AND. & |
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latr<(pi/2.-lat_sun) .AND. latr>(-pi/2.-lat_sun)) THEN |
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omega = -tan(latr)*tan(lat_sun) |
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omega = acos(omega) |
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END IF |
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omega1 = gmtime1 + rlon(i)*86400.0/360.0 |
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omega1 = omega1/86400.0*deux_pi |
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omega1 = mod(omega1+deux_pi, deux_pi) |
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omega1 = omega1 - pi |
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omega2 = gmtime2 + rlon(i)*86400.0/360.0 |
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omega2 = omega2/86400.0*deux_pi |
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omega2 = mod(omega2+deux_pi, deux_pi) |
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omega2 = omega2 - pi |
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TEST_OMEGA12: IF (omega1<=omega2) THEN |
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! on est dans la meme journee locale |
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IF (omega2<=-omega .OR. omega1>=omega .OR. omega<1E-5) THEN |
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! nuit |
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IF (present(frac)) frac(i) = 0.0 |
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pmu0(i) = 0.0 |
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ELSE |
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! jour + nuit / jour |
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omegadeb = max(-omega, omega1) |
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omegafin = min(omega, omega2) |
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IF (present(frac)) frac(i) = (omegafin-omegadeb)/(omega2-omega1) |
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pmu0(i) = sin(latr)*sin(lat_sun) + cos(latr)*cos(lat_sun)*(sin( & |
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omegafin)-sin(omegadeb))/(omegafin-omegadeb) |
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END IF |
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ELSE TEST_OMEGA12 |
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!---omega1 GT omega2 -- a cheval sur deux journees |
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!-------------------entre omega1 et pi |
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IF (omega1>=omega) THEN !--nuit |
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zfrac1 = 0.0 |
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z1_mu = 0.0 |
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ELSE !--jour+nuit |
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omegadeb = max(-omega, omega1) |
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omegafin = omega |
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zfrac1 = omegafin - omegadeb |
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z1_mu = sin(latr)*sin(lat_sun) + cos(latr)*cos(lat_sun)*(sin( & |
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omegafin)-sin(omegadeb))/(omegafin-omegadeb) |
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END IF |
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!---------------------entre -pi et omega2 |
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IF (omega2<=-omega) THEN !--nuit |
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zfrac2 = 0.0 |
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z2_mu = 0.0 |
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ELSE !--jour+nuit |
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omegadeb = -omega |
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omegafin = min(omega, omega2) |
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zfrac2 = omegafin - omegadeb |
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z2_mu = sin(latr)*sin(lat_sun) + cos(latr)*cos(lat_sun)*(sin( & |
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omegafin)-sin(omegadeb))/(omegafin-omegadeb) |
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END IF |
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!-----------------------moyenne |
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IF (present(frac)) frac(i) = (zfrac1+zfrac2)/ & |
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(omega2+deux_pi-omega1) |
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pmu0(i) = (zfrac1*z1_mu+zfrac2*z2_mu)/max(zfrac1+zfrac2, 1.E-10) |
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END IF TEST_OMEGA12 |
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END DO |
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END SUBROUTINE zenang |
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end module zenang_m |
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