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Last change
on this file since 4517 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:
690 bytes
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| 1 | SUBROUTINE Update_SUN() |
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| 2 | |
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| 3 | IMPLICIT NONE |
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| 4 | INCLUDE 'KPP_ROOT_Parameters.h' |
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| 5 | INCLUDE 'KPP_ROOT_Global.h' |
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| 6 | |
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| 7 | KPP_REAL SunRise, SunSet |
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| 8 | KPP_REAL Thour, Tlocal, Ttmp, PI |
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| 9 | PARAMETER (PI = 3.14159265358979d0) |
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| 10 | |
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| 11 | SunRise = 4.5 |
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| 12 | SunSet = 19.5 |
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| 13 | Thour = TIME/3600. |
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| 14 | Tlocal = Thour - (INT(Thour)/24)*24 |
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| 15 | |
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| 16 | IF ((Tlocal.GE.SunRise).AND.(Tlocal.LE.SunSet)) THEN |
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| 17 | Ttmp = (2.0*Tlocal-SunRise-SunSet)/(SunSet-SunRise) |
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| 18 | IF (Ttmp.GT.0) THEN |
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| 19 | Ttmp = Ttmp*Ttmp |
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| 20 | ELSE |
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| 21 | Ttmp = -Ttmp*Ttmp |
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| 22 | END IF |
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| 23 | SUN = ( 1.0 + COS(PI*Ttmp) )/2.0 |
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| 24 | ELSE |
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| 25 | SUN = 0.0 |
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| 26 | END IF |
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| 27 | |
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| 28 | RETURN |
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| 29 | END |
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| 30 | |
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