Last change
on this file since 3711 was
2696,
checked in by kanani, 7 years ago
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Merge of branch palm4u into trunk
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File size:
704 bytes
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1 | SUBROUTINE Update_SUN() |
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2 | !USE KPP_ROOT_Parameters |
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3 | !USE KPP_ROOT_Global |
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4 | |
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5 | IMPLICIT NONE |
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6 | |
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7 | KPP_REAL :: SunRise, SunSet |
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8 | KPP_REAL :: Thour, Tlocal, Ttmp |
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9 | ! PI - Value of pi |
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10 | KPP_REAL, PARAMETER :: PI = 3.14159265358979d0 |
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11 | |
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12 | SunRise = 4.5_dp |
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13 | SunSet = 19.5_dp |
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14 | Thour = TIME/3600.0_dp |
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15 | Tlocal = Thour - (INT(Thour)/24)*24 |
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16 | |
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17 | IF ((Tlocal>=SunRise).AND.(Tlocal<=SunSet)) THEN |
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18 | Ttmp = (2.0*Tlocal-SunRise-SunSet)/(SunSet-SunRise) |
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19 | IF (Ttmp.GT.0) THEN |
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20 | Ttmp = Ttmp*Ttmp |
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21 | ELSE |
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22 | Ttmp = -Ttmp*Ttmp |
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23 | END IF |
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24 | SUN = ( 1.0_dp + COS(PI*Ttmp) )/2.0_dp |
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25 | ELSE |
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26 | SUN = 0.0_dp |
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27 | END IF |
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28 | |
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29 | END SUBROUTINE Update_SUN |
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30 | |
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