Last change
on this file since 4620 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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