| 1 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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| 2 | ! |
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| 3 | ! This file converts a POP grid.dat file to a remapping grid file |
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| 4 | ! in netCDF format. |
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| 5 | ! |
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| 6 | !----------------------------------------------------------------------- |
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| 7 | ! |
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| 8 | ! CVS:$Id$ |
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| 9 | ! |
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| 10 | ! Copyright (c) 1997, 1998 the Regents of the University of |
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| 11 | ! California. |
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| 12 | ! |
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| 13 | ! Unless otherwise indicated, this software has been authored |
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| 14 | ! by an employee or employees of the University of California, |
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| 15 | ! operator of the Los Alamos National Laboratory under Contract |
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| 16 | ! No. W-7405-ENG-36 with the U.S. Department of Energy. The U.S. |
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| 17 | ! Government has rights to use, reproduce, and distribute this |
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| 18 | ! software. The public may copy and use this software without |
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| 19 | ! charge, provided that this Notice and any statement of authorship |
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| 20 | ! are reproduced on all copies. Neither the Government nor the |
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| 21 | ! University makes any warranty, express or implied, or assumes |
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| 22 | ! any liability or responsibility for the use of this software. |
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| 23 | ! |
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| 24 | !*********************************************************************** |
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| 25 | |
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| 26 | program convertPOPT |
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| 27 | |
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| 28 | !----------------------------------------------------------------------- |
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| 29 | ! |
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| 30 | ! This file converts a POP grid.dat file to a remapping grid file. |
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| 31 | ! |
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| 32 | !----------------------------------------------------------------------- |
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| 33 | |
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| 34 | use kinds_mod |
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| 35 | use constants |
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| 36 | use iounits |
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| 37 | use netcdf_mod |
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| 38 | |
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| 39 | implicit none |
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| 40 | |
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| 41 | !----------------------------------------------------------------------- |
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| 42 | ! |
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| 43 | ! variables that describe the grid |
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| 44 | ! 4/3 nx = 192, ny = 128 |
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| 45 | ! 2/3 (mod) nx = 384, ny = 288 |
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| 46 | ! x3p Greenland DP nx = 100, ny = 116 |
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| 47 | ! x2p Greenland DP nx = 160, ny = 192 |
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| 48 | ! x1p Greenland DP nx = 320, ny = 384 |
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| 49 | ! |
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| 50 | !----------------------------------------------------------------------- |
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| 51 | |
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| 52 | integer (kind=int_kind), parameter :: |
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| 53 | & nx = 320, ny = 384, |
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| 54 | & grid_size = nx*ny, |
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| 55 | & grid_rank = 2, |
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| 56 | & grid_corners = 4 |
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| 57 | |
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| 58 | integer (kind=int_kind), dimension(2) :: |
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| 59 | & grid_dims ! size of each dimension |
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| 60 | |
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| 61 | character(char_len), parameter :: |
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| 62 | & grid_name = 'Greenland DP x1p', |
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| 63 | & grid_file_in = '/scratch/pwjones/grid.320x384.da', |
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| 64 | & grid_topo_in = '/scratch/pwjones/kmt.320x384.da', |
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| 65 | & grid_file_out = '/scratch/pwjones/Greenland_DP_x1p.nc' |
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| 66 | |
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| 67 | real (kind=dbl_kind), parameter :: |
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| 68 | & radius = 6370.0e5_dbl_kind ! radius of Earth (cm) |
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| 69 | &, area_norm = one/(radius*radius) |
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| 70 | |
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| 71 | !----------------------------------------------------------------------- |
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| 72 | ! |
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| 73 | ! grid coordinates and masks |
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| 74 | ! |
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| 75 | !----------------------------------------------------------------------- |
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| 76 | |
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| 77 | integer (kind=int_kind), dimension(grid_size) :: |
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| 78 | & grid_imask |
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| 79 | |
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| 80 | real (kind=dbl_kind), dimension(grid_size) :: |
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| 81 | & grid_area , ! area as computed in POP |
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| 82 | & grid_center_lat, ! lat/lon coordinates for |
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| 83 | & grid_center_lon ! each grid center in radians |
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| 84 | |
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| 85 | real (kind=dbl_kind), dimension(grid_corners,grid_size) :: |
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| 86 | & grid_corner_lat, ! lat/lon coordinates for |
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| 87 | & grid_corner_lon ! each grid corner in radians |
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| 88 | |
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| 89 | real (kind=dbl_kind), dimension(nx,ny) :: |
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| 90 | & HTN, HTE ! T-cell grid lengths |
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| 91 | |
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| 92 | !----------------------------------------------------------------------- |
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| 93 | ! |
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| 94 | ! other local variables |
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| 95 | ! |
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| 96 | !----------------------------------------------------------------------- |
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| 97 | |
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| 98 | integer (kind=int_kind) :: i, j, n, iunit, ocn_add, im1, jm1 |
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| 99 | |
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| 100 | integer (kind=int_kind) :: |
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| 101 | & ncstat, ! general netCDF status variable |
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| 102 | & nc_grid_id, ! netCDF grid dataset id |
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| 103 | & nc_gridsize_id, ! netCDF grid size dim id |
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| 104 | & nc_gridcorn_id, ! netCDF grid corner dim id |
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| 105 | & nc_gridrank_id, ! netCDF grid rank dim id |
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| 106 | & nc_griddims_id, ! netCDF grid dimensions id |
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| 107 | & nc_grdcntrlat_id, ! netCDF grid center lat id |
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| 108 | & nc_grdcntrlon_id, ! netCDF grid center lon id |
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| 109 | & nc_grdimask_id, ! netCDF grid mask id |
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| 110 | & nc_gridarea_id, ! netCDF grid area id |
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| 111 | & nc_grdcrnrlat_id, ! netCDF grid corner lat id |
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| 112 | & nc_grdcrnrlon_id ! netCDF grid corner lon id |
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| 113 | |
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| 114 | integer (kind=int_kind), dimension(2) :: |
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| 115 | & nc_dims2_id ! netCDF dim id array for 2-d arrays |
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| 116 | |
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| 117 | real (kind=dbl_kind) :: tmplon, dxt, dyt |
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| 118 | |
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| 119 | !----------------------------------------------------------------------- |
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| 120 | ! |
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| 121 | ! read in grid info |
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| 122 | ! lat/lon info is on velocity points which correspond |
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| 123 | ! to the NE corner (in logical space) of the grid cell. |
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| 124 | ! |
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| 125 | !----------------------------------------------------------------------- |
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| 126 | |
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| 127 | call get_unit(iunit) |
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| 128 | open(unit=iunit, file=grid_topo_in, status='old', |
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| 129 | & form='unformatted', access='direct', recl=grid_size*4) |
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| 130 | read (unit=iunit,rec=1) grid_imask |
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| 131 | call release_unit(iunit) |
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| 132 | |
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| 133 | call get_unit(iunit) |
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| 134 | open(unit=iunit, file=grid_file_in, status='old', |
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| 135 | & form='unformatted', access='direct', recl=grid_size*8) |
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| 136 | read (unit=iunit, rec=1) grid_corner_lat(3,:) |
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| 137 | read (unit=iunit, rec=2) grid_corner_lon(3,:) |
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| 138 | read (unit=iunit, rec=3) HTN |
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| 139 | read (unit=iunit, rec=4) HTE |
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| 140 | call release_unit(iunit) |
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| 141 | |
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| 142 | grid_dims(1) = nx |
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| 143 | grid_dims(2) = ny |
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| 144 | |
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| 145 | !----------------------------------------------------------------------- |
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| 146 | ! |
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| 147 | ! convert KMT field to integer grid mask |
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| 148 | ! |
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| 149 | !----------------------------------------------------------------------- |
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| 150 | |
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| 151 | grid_imask = min(grid_imask, 1) |
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| 152 | |
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| 153 | !----------------------------------------------------------------------- |
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| 154 | ! |
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| 155 | ! compute remaining corners |
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| 156 | ! |
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| 157 | !----------------------------------------------------------------------- |
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| 158 | |
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| 159 | do j=1,ny |
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| 160 | do i=1,nx |
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| 161 | ocn_add = (j-1)*nx + i |
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| 162 | if (i .ne. 1) then |
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| 163 | im1 = ocn_add - 1 |
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| 164 | else |
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| 165 | im1 = ocn_add + nx - 1 |
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| 166 | endif |
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| 167 | |
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| 168 | grid_corner_lat(4,ocn_add) = grid_corner_lat(3,im1) |
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| 169 | grid_corner_lon(4,ocn_add) = grid_corner_lon(3,im1) |
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| 170 | end do |
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| 171 | end do |
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| 172 | |
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| 173 | do j=2,ny |
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| 174 | do i=1,nx |
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| 175 | ocn_add = (j-1)*nx + i |
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| 176 | jm1 = (j-2)*nx + i |
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| 177 | |
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| 178 | grid_corner_lat(2,ocn_add) = grid_corner_lat(3,jm1) |
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| 179 | grid_corner_lat(1,ocn_add) = grid_corner_lat(4,jm1) |
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| 180 | |
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| 181 | grid_corner_lon(2,ocn_add) = grid_corner_lon(3,jm1) |
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| 182 | grid_corner_lon(1,ocn_add) = grid_corner_lon(4,jm1) |
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| 183 | end do |
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| 184 | end do |
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| 185 | |
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| 186 | !----------------------------------------------------------------------- |
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| 187 | ! |
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| 188 | ! mock up the lower row boundaries |
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| 189 | ! |
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| 190 | !----------------------------------------------------------------------- |
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| 191 | |
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| 192 | do i=1,nx |
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| 193 | grid_corner_lat(1,i) = -pih + tiny |
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| 194 | grid_corner_lat(2,i) = -pih + tiny |
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| 195 | |
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| 196 | grid_corner_lon(1,i) = grid_corner_lon(4,i) |
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| 197 | grid_corner_lon(2,i) = grid_corner_lon(3,i) |
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| 198 | end do |
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| 199 | |
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| 200 | !----------------------------------------------------------------------- |
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| 201 | ! |
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| 202 | ! correct for 0,2pi longitude crossings |
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| 203 | ! |
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| 204 | !----------------------------------------------------------------------- |
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| 205 | |
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| 206 | do ocn_add=1,grid_size |
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| 207 | if (grid_corner_lon(1,ocn_add) > pi2) |
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| 208 | & grid_corner_lon(1,ocn_add) = |
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| 209 | & grid_corner_lon(1,ocn_add) - pi2 |
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| 210 | if (grid_corner_lon(1,ocn_add) < 0.0) |
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| 211 | & grid_corner_lon(1,ocn_add) = |
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| 212 | & grid_corner_lon(1,ocn_add) + pi2 |
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| 213 | do n=2,grid_corners |
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| 214 | tmplon = grid_corner_lon(n ,ocn_add) - |
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| 215 | & grid_corner_lon(n-1,ocn_add) |
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| 216 | if (tmplon < -three*pih) grid_corner_lon(n,ocn_add) = |
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| 217 | & grid_corner_lon(n,ocn_add) + pi2 |
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| 218 | if (tmplon > three*pih) grid_corner_lon(n,ocn_add) = |
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| 219 | & grid_corner_lon(n,ocn_add) - pi2 |
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| 220 | end do |
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| 221 | end do |
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| 222 | |
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| 223 | !----------------------------------------------------------------------- |
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| 224 | ! |
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| 225 | ! compute ocean cell centers by averaging corner values |
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| 226 | ! |
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| 227 | !----------------------------------------------------------------------- |
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| 228 | |
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| 229 | do ocn_add=1,grid_size |
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| 230 | grid_center_lat(ocn_add) = grid_corner_lat(1,ocn_add) |
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| 231 | grid_center_lon(ocn_add) = grid_corner_lon(1,ocn_add) |
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| 232 | do n=2,grid_corners |
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| 233 | grid_center_lat(ocn_add) = grid_center_lat(ocn_add) + |
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| 234 | & grid_corner_lat(n,ocn_add) |
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| 235 | grid_center_lon(ocn_add) = grid_center_lon(ocn_add) + |
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| 236 | & grid_corner_lon(n,ocn_add) |
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| 237 | end do |
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| 238 | grid_center_lat(ocn_add) = grid_center_lat(ocn_add)/ |
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| 239 | & float(grid_corners) |
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| 240 | grid_center_lon(ocn_add) = grid_center_lon(ocn_add)/ |
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| 241 | & float(grid_corners) |
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| 242 | if (grid_center_lon(ocn_add) > pi2) |
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| 243 | & grid_center_lon(ocn_add) = grid_center_lon(ocn_add) - pi2 |
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| 244 | if (grid_center_lon(ocn_add) < 0.0) |
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| 245 | & grid_center_lon(ocn_add) = grid_center_lon(ocn_add) + pi2 |
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| 246 | end do |
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| 247 | |
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| 248 | !----------------------------------------------------------------------- |
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| 249 | ! |
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| 250 | ! compute cell areas in same way as POP |
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| 251 | ! |
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| 252 | !----------------------------------------------------------------------- |
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| 253 | |
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| 254 | n = 0 |
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| 255 | do j=1,ny |
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| 256 | if (j > 1) then |
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| 257 | jm1 = j-1 |
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| 258 | else |
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| 259 | jm1 = 1 |
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| 260 | endif |
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| 261 | do i=1,nx |
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| 262 | if (i > 1) then |
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| 263 | im1 = i-1 |
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| 264 | else |
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| 265 | im1 = nx |
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| 266 | endif |
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| 267 | |
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| 268 | n = n+1 |
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| 269 | |
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| 270 | dxt = half*(HTN(i,j) + HTN(i,jm1)) |
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| 271 | dyt = half*(HTE(i,j) + HTE(im1,j)) |
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| 272 | if (dxt == zero) dxt=one |
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| 273 | if (dyt == zero) dyt=one |
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| 274 | |
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| 275 | grid_area(n) = dxt*dyt*area_norm |
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| 276 | end do |
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| 277 | end do |
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| 278 | |
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| 279 | !----------------------------------------------------------------------- |
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| 280 | ! |
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| 281 | ! set up attributes for netCDF file |
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| 282 | ! |
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| 283 | !----------------------------------------------------------------------- |
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| 284 | |
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| 285 | !*** |
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| 286 | !*** create netCDF dataset for this grid |
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| 287 | !*** |
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| 288 | |
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| 289 | ncstat = nf_create (grid_file_out, NF_CLOBBER, |
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| 290 | & nc_grid_id) |
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| 291 | call netcdf_error_handler(ncstat) |
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| 292 | |
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| 293 | ncstat = nf_put_att_text (nc_grid_id, NF_GLOBAL, 'title', |
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| 294 | & len_trim(grid_name), grid_name) |
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| 295 | call netcdf_error_handler(ncstat) |
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| 296 | |
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| 297 | !*** |
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| 298 | !*** define grid size dimension |
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| 299 | !*** |
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| 300 | |
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| 301 | ncstat = nf_def_dim (nc_grid_id, 'grid_size', grid_size, |
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| 302 | & nc_gridsize_id) |
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| 303 | call netcdf_error_handler(ncstat) |
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| 304 | |
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| 305 | !*** |
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| 306 | !*** define grid rank dimension |
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| 307 | !*** |
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| 308 | |
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| 309 | ncstat = nf_def_dim (nc_grid_id, 'grid_rank', grid_rank, |
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| 310 | & nc_gridrank_id) |
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| 311 | call netcdf_error_handler(ncstat) |
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| 312 | |
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| 313 | !*** |
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| 314 | !*** define grid corner dimension |
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| 315 | !*** |
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| 316 | |
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| 317 | ncstat = nf_def_dim (nc_grid_id, 'grid_corners', grid_corners, |
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| 318 | & nc_gridcorn_id) |
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| 319 | call netcdf_error_handler(ncstat) |
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| 320 | |
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| 321 | !*** |
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| 322 | !*** define grid dim size array |
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| 323 | !*** |
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| 324 | |
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| 325 | ncstat = nf_def_var (nc_grid_id, 'grid_dims', NF_INT, |
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| 326 | & 1, nc_gridrank_id, nc_griddims_id) |
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| 327 | call netcdf_error_handler(ncstat) |
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| 328 | |
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| 329 | !*** |
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| 330 | !*** define grid center latitude array |
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| 331 | !*** |
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| 332 | |
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| 333 | ncstat = nf_def_var (nc_grid_id, 'grid_center_lat', NF_DOUBLE, |
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| 334 | & 1, nc_gridsize_id, nc_grdcntrlat_id) |
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| 335 | call netcdf_error_handler(ncstat) |
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| 336 | |
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| 337 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcntrlat_id, 'units', |
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| 338 | & 7, 'radians') |
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| 339 | call netcdf_error_handler(ncstat) |
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| 340 | |
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| 341 | !*** |
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| 342 | !*** define grid center longitude array |
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| 343 | !*** |
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| 344 | |
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| 345 | ncstat = nf_def_var (nc_grid_id, 'grid_center_lon', NF_DOUBLE, |
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| 346 | & 1, nc_gridsize_id, nc_grdcntrlon_id) |
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| 347 | call netcdf_error_handler(ncstat) |
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| 348 | |
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| 349 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcntrlon_id, 'units', |
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| 350 | & 7, 'radians') |
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| 351 | call netcdf_error_handler(ncstat) |
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| 352 | |
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| 353 | !*** |
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| 354 | !*** define grid area array |
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| 355 | !*** |
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| 356 | |
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| 357 | ncstat = nf_def_var (nc_grid_id, 'grid_area', NF_DOUBLE, |
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| 358 | & 1, nc_gridsize_id, nc_gridarea_id) |
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| 359 | call netcdf_error_handler(ncstat) |
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| 360 | |
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| 361 | !*** |
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| 362 | !*** define grid mask |
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| 363 | !*** |
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| 364 | |
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| 365 | ncstat = nf_def_var (nc_grid_id, 'grid_imask', NF_INT, |
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| 366 | & 1, nc_gridsize_id, nc_grdimask_id) |
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| 367 | call netcdf_error_handler(ncstat) |
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| 368 | |
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| 369 | ncstat = nf_put_att_text (nc_grid_id, nc_grdimask_id, 'units', |
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| 370 | & 8, 'unitless') |
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| 371 | call netcdf_error_handler(ncstat) |
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| 372 | |
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| 373 | !*** |
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| 374 | !*** define grid corner latitude array |
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| 375 | !*** |
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| 376 | |
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| 377 | nc_dims2_id(1) = nc_gridcorn_id |
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| 378 | nc_dims2_id(2) = nc_gridsize_id |
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| 379 | |
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| 380 | ncstat = nf_def_var (nc_grid_id, 'grid_corner_lat', NF_DOUBLE, |
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| 381 | & 2, nc_dims2_id, nc_grdcrnrlat_id) |
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| 382 | call netcdf_error_handler(ncstat) |
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| 383 | |
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| 384 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcrnrlat_id, 'units', |
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| 385 | & 7, 'radians') |
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| 386 | call netcdf_error_handler(ncstat) |
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| 387 | |
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| 388 | !*** |
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| 389 | !*** define grid corner longitude array |
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| 390 | !*** |
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| 391 | |
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| 392 | ncstat = nf_def_var (nc_grid_id, 'grid_corner_lon', NF_DOUBLE, |
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| 393 | & 2, nc_dims2_id, nc_grdcrnrlon_id) |
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| 394 | call netcdf_error_handler(ncstat) |
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| 395 | |
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| 396 | ncstat = nf_put_att_text (nc_grid_id, nc_grdcrnrlon_id, 'units', |
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| 397 | & 7, 'radians') |
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| 398 | call netcdf_error_handler(ncstat) |
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| 399 | |
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| 400 | !*** |
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| 401 | !*** end definition stage |
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| 402 | !*** |
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| 403 | |
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| 404 | ncstat = nf_enddef(nc_grid_id) |
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| 405 | call netcdf_error_handler(ncstat) |
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| 406 | |
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| 407 | !----------------------------------------------------------------------- |
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| 408 | ! |
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| 409 | ! write grid data |
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| 410 | ! |
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| 411 | !----------------------------------------------------------------------- |
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| 412 | |
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| 413 | ncstat = nf_put_var_int(nc_grid_id, nc_griddims_id, grid_dims) |
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| 414 | call netcdf_error_handler(ncstat) |
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| 415 | |
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| 416 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcntrlat_id, |
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| 417 | & grid_center_lat) |
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| 418 | ncstat = nf_put_var_int(nc_grid_id, nc_grdimask_id, grid_imask) |
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| 419 | call netcdf_error_handler(ncstat) |
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| 420 | |
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| 421 | ncstat = nf_put_var_double(nc_grid_id, nc_gridarea_id, |
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| 422 | & grid_area) |
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| 423 | call netcdf_error_handler(ncstat) |
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| 424 | |
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| 425 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcntrlat_id, |
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| 426 | & grid_center_lat) |
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| 427 | call netcdf_error_handler(ncstat) |
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| 428 | |
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| 429 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcntrlon_id, |
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| 430 | & grid_center_lon) |
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| 431 | call netcdf_error_handler(ncstat) |
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| 432 | |
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| 433 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcrnrlat_id, |
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| 434 | & grid_corner_lat) |
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| 435 | call netcdf_error_handler(ncstat) |
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| 436 | |
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| 437 | ncstat = nf_put_var_double(nc_grid_id, nc_grdcrnrlon_id, |
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| 438 | & grid_corner_lon) |
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| 439 | call netcdf_error_handler(ncstat) |
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| 440 | |
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| 441 | ncstat = nf_close(nc_grid_id) |
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| 442 | |
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| 443 | !*********************************************************************** |
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| 444 | |
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| 445 | end program convertPOPT |
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| 446 | |
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| 447 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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