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Last change
on this file since 4725 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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