[64] | 1 | !! This module define solar |
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| 2 | !! |
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| 3 | !! @call sechiba_main |
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| 4 | !! @Version : $Revision: 1.1 $, $Date: 2010/04/06 14:26:07 $ |
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| 5 | !! |
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| 6 | !! $Header: /home/ssipsl/CVSREP/ORCHIDEE/src_global/solar.f90,v 1.1 2010/04/06 14:26:07 ssipsl Exp $ |
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| 7 | !! |
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| 8 | !! @author Marie-Alice Foujols, Jan Polcher and Martial Mancip |
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| 9 | !! |
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| 10 | !! |
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| 11 | MODULE solar |
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| 12 | |
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| 13 | USE defprec |
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| 14 | USE constantes |
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| 15 | USE parallel |
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| 16 | |
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| 17 | IMPLICIT NONE |
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| 18 | |
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| 19 | |
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| 20 | |
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| 21 | CONTAINS |
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| 22 | ! |
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| 23 | !f90doc CONTAINS |
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| 24 | ! |
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| 25 | ! |
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| 26 | ! |
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| 27 | !- |
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| 28 | !===================================================================== |
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| 29 | SUBROUTINE solarang (julian, julian0, iim, jjm, lon, lat, csang) |
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| 30 | !--------------------------------------------------------------------- |
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| 31 | !- This subroutine computes the solar angle according to the method |
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| 32 | !- used by GSWP and developed by J.C. Morill. |
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| 33 | !- See for further details : |
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| 34 | !- http://www.atmo.arizona.edu/~morrill/swrad.html |
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| 35 | !--------------------------------------------------------------------- |
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| 36 | ! |
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| 37 | USE calendar |
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| 38 | ! |
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| 39 | IMPLICIT NONE |
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| 40 | !- |
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| 41 | INTEGER,INTENT(in) :: iim, jjm |
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| 42 | REAL,INTENT(in) :: julian |
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| 43 | REAL,INTENT(in) :: julian0 |
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| 44 | REAL,DIMENSION(iim,jjm), INTENT(in) :: lon, lat |
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| 45 | REAL,DIMENSION(iim,jjm), INTENT(out) :: csang |
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| 46 | !- |
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| 47 | REAL :: gamma, dec, decd |
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| 48 | REAL :: et, gmt, le, ls, lcorr, latime, omega, omegad |
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| 49 | REAL :: llatd, llat |
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| 50 | INTEGER :: igmt, ilon, ilat |
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| 51 | INTEGER,SAVE,ALLOCATABLE :: zone(:), lhour(:) |
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| 52 | ! |
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| 53 | LOGICAL :: check = .FALSE. |
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| 54 | !--------------------------------------------------------------------- |
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| 55 | ! |
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| 56 | ! pi = 4.*ATAN(1.) |
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| 57 | IF (check) WRITE(numout,*) 'We get the right calendar information' |
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| 58 | !- |
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| 59 | !- 1) Day angle gamma |
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| 60 | !- |
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| 61 | ! gamma = 2.*pi*MOD(julian,one_year)/one_year |
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| 62 | gamma = 2.*pi*(julian-julian0)/one_year |
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| 63 | !- |
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| 64 | !- 2) Solar declination (assumed constant for a 24 hour period) page 7 |
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| 65 | !- in radians |
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| 66 | !- |
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| 67 | IF (check) WRITE(numout,*) 'Solar declination' |
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| 68 | ! |
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| 69 | dec = ( 0.006918-0.399912*COS(gamma)+0.070257*SIN(gamma) & |
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| 70 | & -0.006758*COS(2*gamma)+0.000907*SIN(2*gamma) & |
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| 71 | & -0.002697*COS(3*gamma)+0.00148*SIN(3*gamma)) |
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| 72 | decd = dec*(180/pi) |
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| 73 | !- |
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| 74 | !- maximum error 0.0006 rad (<3'), leads to error |
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| 75 | !- of less than 1/2 degree in zenith angle |
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| 76 | !- |
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| 77 | IF (check) WRITE(numout,*) 'Equation of time' |
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| 78 | !- 3) Equation of time page 11 |
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| 79 | !- |
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| 80 | et = ( 0.000075+0.001868*COS(gamma)-0.032077*SIN(gamma)& |
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| 81 | & -0.014615*COS(2*gamma)-0.04089*SIN(2*gamma))*229.18 |
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| 82 | !- |
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| 83 | !- Get the time zones for the current time |
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| 84 | !- |
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| 85 | gmt = 24.*(julian-INT(julian)) |
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| 86 | IF (.NOT.ALLOCATED(zone)) ALLOCATE(zone(iim)) |
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| 87 | IF (.NOT.ALLOCATED(lhour)) ALLOCATE(lhour(iim)) |
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| 88 | !- |
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| 89 | igmt = NINT(gmt) |
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| 90 | IF (check) WRITE(numout,*) 'Get time zone' |
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| 91 | CALL time_zone(igmt, iim, jjm, lon, zone, lhour) |
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| 92 | !- |
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| 93 | !- Start a loop through the grid |
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| 94 | !- |
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| 95 | IF (check) WRITE(numout,*) 'Start a loop through the grid' |
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| 96 | DO ilon=1,iim |
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| 97 | !--- |
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| 98 | !--- 4) Local apparent time page 13 |
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| 99 | !--- |
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| 100 | !--- ls standard longitude (nearest 15 degree meridian) |
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| 101 | !--- le local longtitude |
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| 102 | !--- lhour local standard time |
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| 103 | !--- latime local apparent time |
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| 104 | !--- lcorr longitudunal correction (minutes) |
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| 105 | !--- |
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| 106 | le = lon(ilon,1) |
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| 107 | ls = ((zone(ilon)-1)*15)-180. |
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| 108 | lcorr = 4.*(ls-le)*(-1) |
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| 109 | latime = lhour(ilon)+lcorr/60.+et/60. |
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| 110 | IF (latime < 0.) latime = latime+24 |
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| 111 | IF (latime > 24.) latime = latime-24 |
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| 112 | !--- |
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| 113 | !--- 5) Hour angle omega page 15 |
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| 114 | !--- |
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| 115 | !--- hour angle is zero at noon, positive in the morning |
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| 116 | !--- It ranges from 180 to -180 |
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| 117 | !--- |
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| 118 | !--- omegad is omega in degrees, omega is in radians |
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| 119 | !--- |
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| 120 | omegad = (latime-12.)*(-15.) |
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| 121 | omega = omegad*pi/180. |
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| 122 | !--- |
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| 123 | DO ilat=1,jjm |
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| 124 | !----- |
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| 125 | !----- 6) Zenith angle page 15 |
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| 126 | !----- |
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| 127 | !----- csang cosine of zenith angle (radians) |
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| 128 | !----- llatd = local latitude in degrees |
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| 129 | !----- llat = local latitude in radians |
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| 130 | !----- |
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| 131 | llatd = lat(1,ilat) |
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| 132 | llat = llatd*pi/180. |
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| 133 | csang(ilon,ilat) = & |
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| 134 | & MAX(0.,SIN(dec)*SIN(llat)+COS(dec)*COS(llat)*COS(omega)) |
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| 135 | ENDDO |
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| 136 | ENDDO |
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| 137 | !---------------------- |
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| 138 | END SUBROUTINE solarang |
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| 139 | !- |
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| 140 | !===================================================================== |
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| 141 | SUBROUTINE time_zone (gmt, iim, jjm, lon, zone, lhour) |
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| 142 | !--------------------------------------------------------------------- |
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| 143 | ! |
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| 144 | IMPLICIT NONE |
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| 145 | ! |
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| 146 | INTEGER :: gmt, iim, jjm, zone(iim), lhour(iim) |
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| 147 | REAL :: lon(iim,jjm) |
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| 148 | !- |
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| 149 | INTEGER :: deg |
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| 150 | !!?? REAL :: deg |
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| 151 | INTEGER :: i, ilon, change |
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| 152 | !--------------------------------------------------------------------- |
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| 153 | DO ilon=1,iim |
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| 154 | !--- |
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| 155 | !--- Convert longitude index to longtitude in degrees |
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| 156 | !--- |
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| 157 | deg = lon(ilon,1) |
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| 158 | !--- |
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| 159 | !--- Determine into which time zone (15 degree interval) the |
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| 160 | !--- longitude falls. |
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| 161 | !--- |
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| 162 | DO i=1,25 |
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| 163 | IF (deg < (-187.5+(15*i))) THEN |
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| 164 | zone(ilon) = i |
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| 165 | IF (zone(ilon) == 25) zone(ilon) = 1 |
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| 166 | EXIT |
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| 167 | ENDIF |
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| 168 | ENDDO |
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| 169 | !--- |
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| 170 | !--- Calculate change (in number of hours) from GMT time to |
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| 171 | !--- local hour. Change will be negative for zones < 13 and |
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| 172 | !--- positive for zones > 13. |
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| 173 | !--- |
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| 174 | !--- There is also a correction for lhour < 0 and lhour > 23 |
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| 175 | !--- to lhour between 0 and 23. |
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| 176 | !--- |
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| 177 | IF (zone(ilon) < 13) THEN |
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| 178 | change = zone(ilon)-13 |
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| 179 | lhour(ilon) = gmt+change |
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| 180 | ENDIF |
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| 181 | !--- |
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| 182 | IF (zone(ilon) == 13) THEN |
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| 183 | lhour(ilon) = gmt |
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| 184 | ENDIF |
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| 185 | !--- |
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| 186 | IF (zone(ilon) > 13) THEN |
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| 187 | change = zone(ilon)-13 |
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| 188 | lhour(ilon) = gmt+change |
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| 189 | ENDIF |
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| 190 | IF (lhour(ilon) < 0) lhour(ilon) = lhour(ilon)+24 |
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| 191 | IF (lhour(ilon) > 23) lhour(ilon) = lhour(ilon)-24 |
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| 192 | !--- |
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| 193 | ENDDO |
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| 194 | !----------------------- |
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| 195 | END SUBROUTINE time_zone |
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| 196 | |
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| 197 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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| 198 | |
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| 199 | END MODULE solar |
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