| 1 | MODULE grid_conversion |
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| 2 | |
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| 3 | implicit none |
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| 4 | |
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| 5 | !======================================================================= |
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| 6 | contains |
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| 7 | !======================================================================= |
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| 8 | SUBROUTINE lonlat2vect(nlon,nlat,ngrid,v_ll,v_vect) |
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| 9 | ! To convert data from lon x lat grid (where values at the poles are duplicated) into a vector |
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| 10 | ! /!\ The longitudes -180 and +180 are not duplicated like in the PCM dynamics |
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| 11 | |
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| 12 | implicit none |
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| 13 | |
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| 14 | ! Arguments |
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| 15 | !---------- |
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| 16 | integer, intent(in) :: nlon, nlat, ngrid |
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| 17 | real, dimension(nlon,nlat), intent(in) :: v_ll |
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| 18 | real, dimension(ngrid), intent(out) :: v_vect |
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| 19 | |
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| 20 | ! Local variables |
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| 21 | !---------------- |
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| 22 | integer :: i, j |
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| 23 | |
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| 24 | ! Code |
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| 25 | !----- |
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| 26 | ! 1D case |
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| 27 | #ifdef CPP_1D |
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| 28 | v_vect(1) = v_ll(1,1) |
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| 29 | return |
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| 30 | #else |
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| 31 | ! Check |
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| 32 | if (ngrid /= nlon*(nlat - 2) + 2) error stop 'lonlat2vect: problem of dimensions!' |
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| 33 | |
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| 34 | ! Initialization |
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| 35 | v_vect = 0. |
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| 36 | |
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| 37 | ! Treatment of the poles |
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| 38 | v_vect(1) = v_ll(1,1) |
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| 39 | v_vect(ngrid) = v_ll(1,nlat) |
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| 40 | |
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| 41 | ! Treatment of regular points |
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| 42 | do j = 2,nlat - 1 |
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| 43 | do i = 1,nlon |
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| 44 | v_vect(1 + i + (j - 2)*nlon) = v_ll(i,j) |
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| 45 | enddo |
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| 46 | enddo |
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| 47 | #endif |
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| 48 | |
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| 49 | END SUBROUTINE lonlat2vect |
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| 50 | |
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| 51 | !======================================================================= |
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| 52 | SUBROUTINE vect2lonlat(nlon,nlat,ngrid,v_vect,v_ll) |
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| 53 | ! To convert data from a vector into lon x lat grid (where values at the poles are duplicated) |
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| 54 | ! /!\ The longitudes -180 and +180 are not duplicated like in the PCM dynamics |
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| 55 | |
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| 56 | implicit none |
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| 57 | |
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| 58 | ! Arguments |
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| 59 | !---------- |
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| 60 | integer, intent(in) :: nlon, nlat, ngrid |
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| 61 | real, dimension(ngrid), intent(in) :: v_vect |
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| 62 | real, dimension(nlon,nlat), intent(out) :: v_ll |
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| 63 | |
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| 64 | ! Local variables |
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| 65 | !---------------- |
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| 66 | integer :: i, j |
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| 67 | |
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| 68 | ! Code |
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| 69 | !----- |
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| 70 | ! 1D case |
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| 71 | #ifdef CPP_1D |
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| 72 | v_ll(1,1) = v_vect(1) |
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| 73 | return |
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| 74 | #else |
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| 75 | ! Check |
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| 76 | if (ngrid /= nlon*(nlat - 2) + 2) error stop 'vect2lonlat: problem of dimensions!' |
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| 77 | |
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| 78 | ! Initialization |
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| 79 | v_ll = 0. |
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| 80 | |
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| 81 | ! Treatment of the poles |
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| 82 | v_ll(:,1) = v_vect(1) |
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| 83 | v_ll(:,nlat) = v_vect(ngrid) |
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| 84 | |
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| 85 | ! Treatment of regular points |
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| 86 | do j = 2,nlat - 1 |
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| 87 | do i = 1,nlon |
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| 88 | v_ll(i,j) = v_vect(1 + i + (j - 2)*nlon) |
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| 89 | enddo |
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| 90 | enddo |
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| 91 | #endif |
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| 92 | |
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| 93 | END SUBROUTINE vect2lonlat |
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| 94 | |
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| 95 | END MODULE grid_conversion |
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