| 1 | subroutine solang ( kgrid,psilon,pcolon,psilat,pcolat, |
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| 2 | & ptim1,ptim2,ptim3,pmu0,pfract ) |
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| 3 | IMPLICIT NONE |
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| 4 | |
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| 5 | C |
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| 6 | C**** *LW* - ORGANIZES THE LONGWAVE CALCULATIONS |
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| 7 | C |
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| 8 | C PURPOSE. |
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| 9 | C -------- |
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| 10 | C CALCULATES THE SOLAR ANGLE FOR ALL THE POINTS OF THE GRID |
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| 11 | C |
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| 12 | C** INTERFACE. |
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| 13 | C ---------- |
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| 14 | C SUBROUTINE SOLANG ( KGRID ) |
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| 15 | C |
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| 16 | C EXPLICIT ARGUMENTS : |
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| 17 | C -------------------- |
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| 18 | C ==== INPUTS === |
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| 19 | C |
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| 20 | C PSILON(KGRID) : SINUS OF THE LONGITUDE |
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| 21 | C PCOLON(KGRID) : COSINUS OF THE LONGITUDE |
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| 22 | C PSILAT(KGRID) : SINUS OF THE LATITUDE |
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| 23 | C PCOLAT(KGRID) : COSINUS OF THE LATITUDE |
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| 24 | C PTIM1 : SIN(DECLI) |
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| 25 | C PTIM2 : COS(DECLI)*COS(TIME) |
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| 26 | C PTIM3 : SIN(DECLI)*SIN(TIME) |
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| 27 | C |
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| 28 | C ==== OUTPUTS === |
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| 29 | C |
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| 30 | C PMU0 (KGRID) : SOLAR ANGLE |
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| 31 | C PFRACT(KGRID) : DAY FRACTION OF THE TIME INTERVAL |
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| 32 | C |
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| 33 | C IMPLICIT ARGUMENTS : NONE |
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| 34 | C -------------------- |
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| 35 | C |
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| 36 | C METHOD. |
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| 37 | C ------- |
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| 38 | C |
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| 39 | C EXTERNALS. |
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| 40 | C ---------- |
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| 41 | C |
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| 42 | C NONE |
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| 43 | C |
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| 44 | C REFERENCE. |
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| 45 | C ---------- |
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| 46 | C |
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| 47 | C RADIATIVE PROCESSES IN METEOROLOGIE AND CLIMATOLOGIE |
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| 48 | C PALTRIDGE AND PLATT |
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| 49 | C |
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| 50 | C AUTHOR. |
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| 51 | C ------- |
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| 52 | C FREDERIC HOURDIN |
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| 53 | C |
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| 54 | C MODIFICATIONS. |
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| 55 | C -------------- |
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| 56 | C ORIGINAL :90-01-14 |
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| 57 | C 92-02-14 CALCULATIONS DONE THE ENTIER GRID (J.Polcher) |
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| 58 | C----------------------------------------------------------------------- |
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| 59 | C |
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| 60 | C ------------------------------------------------------------------ |
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| 61 | |
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| 62 | C----------------------------------------------------------------------- |
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| 63 | C |
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| 64 | C* 0.1 ARGUMENTS |
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| 65 | C --------- |
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| 66 | C |
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| 67 | INTEGER kgrid |
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| 68 | REAL ptim1,ptim2,ptim3 |
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| 69 | REAL psilon(kgrid),pcolon(kgrid),pmu0(kgrid),pfract(kgrid) |
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| 70 | REAL psilat(kgrid), pcolat(kgrid) |
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| 71 | C |
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| 72 | INTEGER jl |
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| 73 | REAL ztim1,ztim2,ztim3 |
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| 74 | C------------------------------------------------------------------------ |
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| 75 | C------------------------------------------------------------------------ |
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| 76 | C------------------------------------------------------------------------ |
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| 77 | C |
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| 78 | C------------------------------------------------------------------------ |
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| 79 | C |
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| 80 | C* 1. INITIALISATION |
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| 81 | C -------------- |
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| 82 | C |
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| 83 | 100 CONTINUE |
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| 84 | C |
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| 85 | DO jl=1,kgrid |
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| 86 | pmu0(jl)=0. |
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| 87 | pfract(jl)=0. |
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| 88 | ENDDO |
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| 89 | C |
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| 90 | C* 1.1 COMPUTATION OF THE SOLAR ANGLE |
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| 91 | C ------------------------------ |
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| 92 | C |
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| 93 | DO jl=1,kgrid |
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| 94 | ztim1=psilat(jl)*ptim1 |
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| 95 | ztim2=pcolat(jl)*ptim2 |
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| 96 | ztim3=pcolat(jl)*ptim3 |
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| 97 | pmu0(jl)=ztim1+ztim2*pcolon(jl)+ztim3*psilon(jl) |
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| 98 | ENDDO |
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| 99 | C |
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| 100 | C* 1.2 DISTINCTION BETWEEN DAY AND NIGHT |
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| 101 | C --------------------------------- |
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| 102 | C |
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| 103 | DO jl=1,kgrid |
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| 104 | IF (pmu0(jl).gt.0.) THEN |
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| 105 | pfract(jl)=1. |
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| 106 | pmu0(jl)=sqrt(1224.*pmu0(jl)*pmu0(jl)+1.)/35. |
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| 107 | ELSE |
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| 108 | pmu0(jl)=0. |
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| 109 | pfract(jl)=0. |
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| 110 | ENDIF |
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| 111 | ENDDO |
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| 112 | C |
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| 113 | RETURN |
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| 114 | END |
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