7 |
SUBROUTINE zenang(longi, gmtime, pdtrad, mu0, frac) |
SUBROUTINE zenang(longi, gmtime, pdtrad, mu0, frac) |
8 |
|
|
9 |
! Author: O. Boucher (LMD/CNRS), d'après les routines "zenith" et |
! Author: O. Boucher (LMD/CNRS), d'après les routines "zenith" et |
10 |
! "angle" de Z.X. Li |
! "angle" de Z. X. Li |
11 |
|
|
12 |
! Date : première version le 13 décembre 1994, revu pour GCM le 30 |
! Date : première version le 13 décembre 1994, revu pour GCM le 30 |
13 |
! septembre 1996 |
! septembre 1996 |
59 |
lat_sun = asin(sin(longi * pi / 180.) * sin(r_incl * pi / 180.)) |
lat_sun = asin(sin(longi * pi / 180.) * sin(r_incl * pi / 180.)) |
60 |
! Capderou (2003 784, equation 4.49) |
! Capderou (2003 784, equation 4.49) |
61 |
|
|
62 |
gmtime1 = gmtime*86400. |
gmtime1 = gmtime * 86400. |
63 |
gmtime2 = gmtime*86400. + pdtrad |
gmtime2 = gmtime * 86400. + pdtrad |
64 |
|
|
65 |
DO i = 1, klon |
DO i = 1, klon |
66 |
latr = rlat(i)*pi/180. |
latr = rlat(i) * pi / 180. |
67 |
omega = 0.0 ! nuit polaire |
omega = 0. ! nuit polaire |
68 |
IF (latr>=(pi/2.-lat_sun) .OR. latr<=(-pi/2.-lat_sun)) THEN |
IF (latr>=(pi / 2.-lat_sun) .OR. latr<=(-pi / 2.-lat_sun)) THEN |
69 |
omega = pi ! journée polaire |
omega = pi ! journée polaire |
70 |
END IF |
END IF |
71 |
IF (latr<(pi/2.+lat_sun) .AND. latr>(-pi/2.+lat_sun) .AND. & |
IF (latr<(pi / 2.+lat_sun) .AND. latr>(-pi / 2.+lat_sun) .AND. & |
72 |
latr<(pi/2.-lat_sun) .AND. latr>(-pi/2.-lat_sun)) THEN |
latr<(pi / 2.-lat_sun) .AND. latr>(-pi / 2.-lat_sun)) THEN |
73 |
omega = -tan(latr)*tan(lat_sun) |
omega = -tan(latr) * tan(lat_sun) |
74 |
omega = acos(omega) |
omega = acos(omega) |
75 |
END IF |
END IF |
76 |
|
|
77 |
omega1 = gmtime1 + rlon(i)*86400.0/360.0 |
omega1 = gmtime1 + rlon(i) * 86400. / 360. |
78 |
omega1 = omega1/86400.0*twopi |
omega1 = omega1 / 86400. * twopi |
79 |
omega1 = mod(omega1+twopi, twopi) |
omega1 = mod(omega1+twopi, twopi) |
80 |
omega1 = omega1 - pi |
omega1 = omega1 - pi |
81 |
|
|
82 |
omega2 = gmtime2 + rlon(i)*86400.0/360.0 |
omega2 = gmtime2 + rlon(i) * 86400. / 360. |
83 |
omega2 = omega2/86400.0*twopi |
omega2 = omega2 / 86400. * twopi |
84 |
omega2 = mod(omega2+twopi, twopi) |
omega2 = mod(omega2+twopi, twopi) |
85 |
omega2 = omega2 - pi |
omega2 = omega2 - pi |
86 |
|
|
88 |
! on est dans la meme journee locale |
! on est dans la meme journee locale |
89 |
IF (omega2<=-omega .OR. omega1>=omega .OR. omega<1E-5) THEN |
IF (omega2<=-omega .OR. omega1>=omega .OR. omega<1E-5) THEN |
90 |
! nuit |
! nuit |
91 |
IF (present(frac)) frac(i) = 0.0 |
IF (present(frac)) frac(i) = 0. |
92 |
mu0(i) = 0.0 |
mu0(i) = 0. |
93 |
ELSE |
ELSE |
94 |
! jour + nuit / jour |
! jour + nuit / jour |
95 |
omegadeb = max(-omega, omega1) |
omegadeb = max(-omega, omega1) |
96 |
omegafin = min(omega, omega2) |
omegafin = min(omega, omega2) |
97 |
IF (present(frac)) frac(i) = (omegafin-omegadeb)/(omega2-omega1) |
IF (present(frac)) frac(i) = (omegafin-omegadeb) / (omega2-omega1) |
98 |
mu0(i) = sin(latr) * sin(lat_sun) + cos(latr) * cos(lat_sun) & |
mu0(i) = sin(latr) * sin(lat_sun) + cos(latr) * cos(lat_sun) & |
99 |
* (sin(omegafin) - sin(omegadeb)) / (omegafin - omegadeb) |
* (sin(omegafin) - sin(omegadeb)) / (omegafin - omegadeb) |
100 |
END IF |
END IF |
102 |
! omega1 > omega2, à cheval sur deux journées |
! omega1 > omega2, à cheval sur deux journées |
103 |
! entre omega1 et pi |
! entre omega1 et pi |
104 |
IF (omega1>=omega) THEN ! nuit |
IF (omega1>=omega) THEN ! nuit |
105 |
zfrac1 = 0.0 |
zfrac1 = 0. |
106 |
z1_mu = 0.0 |
z1_mu = 0. |
107 |
ELSE ! jour+nuit |
ELSE ! jour+nuit |
108 |
omegadeb = max(-omega, omega1) |
omegadeb = max(-omega, omega1) |
109 |
omegafin = omega |
omegafin = omega |
113 |
END IF |
END IF |
114 |
! entre -pi et omega2 |
! entre -pi et omega2 |
115 |
IF (omega2<=-omega) THEN ! nuit |
IF (omega2<=-omega) THEN ! nuit |
116 |
zfrac2 = 0.0 |
zfrac2 = 0. |
117 |
z2_mu = 0.0 |
z2_mu = 0. |
118 |
ELSE ! jour+nuit |
ELSE ! jour+nuit |
119 |
omegadeb = -omega |
omegadeb = -omega |
120 |
omegafin = min(omega, omega2) |
omegafin = min(omega, omega2) |
123 |
* (sin(omegafin) - sin(omegadeb)) / (omegafin - omegadeb) |
* (sin(omegafin) - sin(omegadeb)) / (omegafin - omegadeb) |
124 |
END IF |
END IF |
125 |
! moyenne |
! moyenne |
126 |
IF (present(frac)) frac(i) = (zfrac1+zfrac2)/ (omega2+twopi-omega1) |
IF (present(frac)) frac(i) = (zfrac1+zfrac2) / (omega2+twopi-omega1) |
127 |
mu0(i) = (zfrac1*z1_mu+zfrac2*z2_mu)/max(zfrac1+zfrac2, 1.E-10) |
mu0(i) = (zfrac1 * z1_mu+zfrac2 * z2_mu) / max(zfrac1+zfrac2, 1e-10) |
128 |
END IF |
END IF |
129 |
END DO |
END DO |
130 |
|
|