| 1 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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| 2 | ! |
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| 3 | ! This module creates grid description files for input to the SCRIP code |
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| 4 | ! |
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| 5 | !----------------------------------------------------------------------- |
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| 6 | |
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| 7 | MODULE scripgrid_mod |
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| 8 | |
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| 9 | USE kinds_mod |
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| 10 | USE constants |
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| 11 | USE iounits |
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| 12 | USE netcdf |
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| 13 | USE netcdf_mod |
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| 14 | |
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| 15 | IMPLICIT NONE |
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| 16 | |
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| 17 | !----------------------------------------------------------------------- |
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| 18 | ! module variables that describe the grid |
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| 19 | |
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| 20 | INTEGER (kind=int_kind), parameter :: & |
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| 21 | grid_rank = 2, & |
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| 22 | grid_corners = 4 |
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| 23 | INTEGER (kind=int_kind) :: nx, ny, grid_size |
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| 24 | INTEGER (kind=int_kind), dimension(2) :: & |
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| 25 | grid_dims, & ! size of x, y dimensions |
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| 26 | grid_dim_ids ! ids of the x, y dimensions |
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| 27 | INTEGER (kind=int_kind), ALLOCATABLE, DIMENSION(:) :: & |
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| 28 | grid_imask ! land-sea mask |
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| 29 | REAL (kind=int_kind), ALLOCATABLE, DIMENSION(:) :: & |
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| 30 | grid_center_lat, & ! lat/lon coordinates for |
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| 31 | grid_center_lon ! each grid center in degrees |
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| 32 | REAL (kind=dbl_kind), ALLOCATABLE, DIMENSION(:,:) :: & |
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| 33 | grid_corner_lat, & ! lat/lon coordinates for |
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| 34 | grid_corner_lon ! each grid corner in degrees |
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| 35 | REAL (kind=dbl_kind), ALLOCATABLE, DIMENSION(:,:,:) :: & |
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| 36 | corner_lon, & |
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| 37 | corner_lat |
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| 38 | REAL (kind=dbl_kind), PARAMETER :: circle = 360.0 |
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| 39 | |
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| 40 | !----------------------------------------------------------------------- |
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| 41 | ! module variables that describe the netcdf file |
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| 42 | |
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| 43 | INTEGER (kind=int_kind) :: & |
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| 44 | ncstat, & ! general netCDF status variable |
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| 45 | ncid_in |
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| 46 | |
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| 47 | CONTAINS |
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| 48 | |
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| 49 | ! ============================================================================== |
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| 50 | |
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| 51 | SUBROUTINE convert(nm_in) |
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| 52 | |
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| 53 | ! ----------------------------------------------------------------------------- |
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| 54 | ! - input variables |
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| 55 | |
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| 56 | CHARACTER(char_len), INTENT(in) :: & |
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| 57 | nm_in |
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| 58 | |
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| 59 | ! ----------------------------------------------------------------------------- |
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| 60 | ! - local variables |
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| 61 | |
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| 62 | CHARACTER(char_len) :: & |
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| 63 | nemo_file, input_file, method, input_lon, input_lat, datagrid_file, & |
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| 64 | nemogrid_file, nemo_lon, nemo_lat, corn_lon, corn_lat, nemo_mask, input_mask |
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| 65 | INTEGER (kind=int_kind), dimension(2) :: & |
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| 66 | offset |
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| 67 | INTEGER (kind=int_kind) :: & |
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| 68 | iunit, nemo_mask_value, input_mask_value |
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| 69 | |
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| 70 | namelist /grid_inputs/ nemo_file, input_file, datagrid_file, nemogrid_file, & |
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| 71 | method, input_lon, input_lat, nemo_lon, nemo_lat, & |
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| 72 | nemo_mask, nemo_mask_value, input_mask, input_mask_value |
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| 73 | |
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| 74 | !----------------------------------------------------------------------- |
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| 75 | ! - namelist describing the processing |
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| 76 | ! note that mask_value is the minimum good value, |
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| 77 | ! so that where the mask is less than the value is masked |
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| 78 | |
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| 79 | nemo_file = "coordinates.nc" |
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| 80 | nemo_lon = "glamt" |
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| 81 | nemo_lat = "gphit" |
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| 82 | input_lon = "lon" |
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| 83 | input_lat = "lat" |
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| 84 | input_mask = "none" |
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| 85 | input_mask_value = 0 |
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| 86 | datagrid_file = 'remap_data_grid.nc' |
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| 87 | nemogrid_file = 'remap_nemo_grid.nc' |
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| 88 | |
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| 89 | call get_unit(iunit) |
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| 90 | open(iunit, file=nm_in, status='old', form='formatted') |
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| 91 | read(iunit, nml=grid_inputs) |
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| 92 | call release_unit(iunit) |
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| 93 | |
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| 94 | if (trim(nemo_file) .eq. 'coordinates.nc') then |
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| 95 | |
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| 96 | ! set up the names of the corner variables for a given input |
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| 97 | ! the offset represents what needs to be added to (i,j) to get to the correct |
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| 98 | ! element in the corner arrays to correspond to the point northeast of the center |
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| 99 | if (nemo_lon(5:5) == "t") then |
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| 100 | corn_lon = "glamf" |
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| 101 | corn_lat = "gphif" |
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| 102 | offset = (/ 0,0 /) |
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| 103 | else if (nemo_lon(5:5) == "u") then |
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| 104 | corn_lon = "glamv" |
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| 105 | corn_lat = "gphiv" |
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| 106 | offset = (/ 1,0 /) |
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| 107 | else if (nemo_lon(5:5) == "v") then |
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| 108 | corn_lon = "glamu" |
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| 109 | corn_lat = "gphiu" |
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| 110 | offset = (/ 0,1 /) |
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| 111 | else |
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| 112 | write(6,*) 'unknown nemo_lon name' |
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| 113 | stop |
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| 114 | endif |
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| 115 | |
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| 116 | write(6,*) "processing " // trim(nemo_file) |
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| 117 | call convertNEMO(nemo_file, nemo_lon, nemo_lat, corn_lon, corn_lat, & |
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| 118 | offset, nemogrid_file) |
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| 119 | |
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| 120 | else |
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| 121 | |
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| 122 | write(6,*) "processing regular grid " // trim(nemo_file) |
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| 123 | call convertFLUX(nemo_file, nemo_lon, nemo_lat, & |
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| 124 | nemo_mask, nemo_mask_value, nemogrid_file) |
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| 125 | |
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| 126 | endif |
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| 127 | |
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| 128 | write(6,*) "processing regular grid" |
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| 129 | call convertFLUX(input_file, input_lon, input_lat, & |
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| 130 | input_mask, input_mask_value, datagrid_file) |
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| 131 | |
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| 132 | END SUBROUTINE convert |
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| 133 | |
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| 134 | ! ============================================================================== |
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| 135 | |
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| 136 | SUBROUTINE convertNEMO(grid_file_in, cent_lon, cent_lat, corn_lon, corn_lat, & |
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| 137 | off, grid_file_out) |
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| 138 | |
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| 139 | !----------------------------------------------------------------------- |
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| 140 | ! |
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| 141 | ! This routine converts a NEMO coordinates.nc file to a remapping grid file. |
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| 142 | ! |
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| 143 | |
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| 144 | CHARACTER(char_len), INTENT(in) :: cent_lon, cent_lat, corn_lon, corn_lat |
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| 145 | INTEGER (kind=int_kind), INTENT(in), DIMENSION(2) :: off |
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| 146 | CHARACTER(char_len), INTENT(in) :: grid_file_out |
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| 147 | CHARACTER(char_len), INTENT(in) :: grid_file_in |
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| 148 | |
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| 149 | !----------------------------------------------------------------------- |
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| 150 | ! module variables that describe the grid |
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| 151 | |
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| 152 | CHARACTER(char_len), parameter :: & |
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| 153 | grid_name = 'Remapped NEMO grid for SCRIP' |
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| 154 | |
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| 155 | !----------------------------------------------------------------------- |
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| 156 | ! grid coordinates and masks |
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| 157 | |
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| 158 | REAL (kind=dbl_kind), ALLOCATABLE, DIMENSION(:,:) :: & |
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| 159 | clon, clat, & ! expanded corner arrays |
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| 160 | glam, & ! center longitude |
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| 161 | gphi, & ! center latitude |
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| 162 | glamc, & ! corner longitude |
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| 163 | gphic ! corner latitude |
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| 164 | |
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| 165 | !----------------------------------------------------------------------- |
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| 166 | ! other local variables |
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| 167 | |
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| 168 | INTEGER (kind=int_kind) :: i, j, n, iunit, im1, jm1, imid, isame, ic, jc |
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| 169 | INTEGER (kind=int_kind) :: varid_lam, varid_phi, varid_lamc, varid_phic |
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| 170 | INTEGER (kind=int_kind) :: jdim |
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| 171 | INTEGER (kind=int_kind), dimension(4) :: grid_dimids ! input fields have 4 dims |
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| 172 | REAL (kind=dbl_kind) :: tmplon, dxt, dyt |
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| 173 | |
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| 174 | !----------------------------------------------------------------------- |
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| 175 | ! read in grid info |
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| 176 | ! |
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| 177 | ! For NEMO input grids, assume that variable names are glam, glamc etc. |
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| 178 | ! Assume that 1st 2 dimensions of these variables are x and y directions. |
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| 179 | ! These assumptions are made by NEMO, so should be valid for coordinates.nc. |
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| 180 | ! |
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| 181 | ! write in nf90 calls (without error handling) and then think about |
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| 182 | ! making more readable by taking chunks into ncutil |
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| 183 | ! |
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| 184 | |
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| 185 | ncstat = nf90_open( grid_file_in, NF90_NOWRITE, ncid_in ) |
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| 186 | call netcdf_error_handler(ncstat) |
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| 187 | |
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| 188 | ! find dimids for 'glam' |
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| 189 | ! use dimids to get dimlengths |
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| 190 | ! allocate glam array |
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| 191 | ! get glam from file |
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| 192 | |
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| 193 | ncstat = nf90_inq_varid( ncid_in, cent_lon, varid_lam ) |
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| 194 | call netcdf_error_handler(ncstat) |
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| 195 | ncstat = nf90_inq_varid( ncid_in, corn_lon, varid_lamc ) |
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| 196 | call netcdf_error_handler(ncstat) |
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| 197 | ncstat = nf90_inq_varid( ncid_in, cent_lat, varid_phi ) |
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| 198 | call netcdf_error_handler(ncstat) |
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| 199 | ncstat = nf90_inq_varid( ncid_in, corn_lat, varid_phic ) |
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| 200 | call netcdf_error_handler(ncstat) |
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| 201 | |
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| 202 | ncstat = nf90_inquire_variable( ncid_in, varid_lam, dimids=grid_dimids(:) ) |
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| 203 | call netcdf_error_handler(ncstat) |
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| 204 | DO jdim = 1, SIZE(grid_dims) |
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| 205 | ncstat = nf90_inquire_dimension( ncid_in, grid_dimids(jdim), & |
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| 206 | len=grid_dims(jdim) ) |
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| 207 | call netcdf_error_handler(ncstat) |
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| 208 | END DO |
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| 209 | nx = grid_dims(1) |
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| 210 | ny = grid_dims(2) |
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| 211 | grid_size = nx * ny |
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| 212 | WRITE(*,FMT='("Input grid dimensions are:",2i6)') nx, ny |
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| 213 | |
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| 214 | ! assume that dimensions are all the same as glam |
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| 215 | ALLOCATE( glam(nx,ny), glamc(nx,ny), gphi(nx,ny), gphic(nx,ny) ) |
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| 216 | ncstat = nf90_get_var( ncid_in, varid_lam, glam(:,:) ) |
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| 217 | call netcdf_error_handler(ncstat) |
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| 218 | ncstat = nf90_get_var( ncid_in, varid_lamc, glamc(:,:) ) |
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| 219 | call netcdf_error_handler(ncstat) |
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| 220 | ncstat = nf90_get_var( ncid_in, varid_phi, gphi(:,:) ) |
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| 221 | call netcdf_error_handler(ncstat) |
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| 222 | ncstat = nf90_get_var( ncid_in, varid_phic, gphic(:,:) ) |
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| 223 | call netcdf_error_handler(ncstat) |
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| 224 | |
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| 225 | !----------------------------------------------------------------------- |
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| 226 | ! - Mask is all ocean for now |
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| 227 | |
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| 228 | ALLOCATE( grid_imask(grid_size) ) |
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| 229 | grid_imask(:) = 1 |
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| 230 | |
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| 231 | !----------------------------------------------------------------------- |
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| 232 | ! corners are arranged as follows: 4 3 |
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| 233 | ! 1 2 |
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| 234 | ! |
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| 235 | ! Assume that cyclic grids have 2 wrap columns in coordinates.nc |
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| 236 | ! (this is the case for ORCA grids) |
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| 237 | ! |
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| 238 | |
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| 239 | ! ----------------------------------------------------------------------------- |
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| 240 | ! create a single pair of arrays for the corners where clon(1,1) corresponds |
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| 241 | ! to the south west corner of a box containing glam(1,1) |
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| 242 | ! various special cases then apply |
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| 243 | ! bottom row: assume clon(:,j) = clon(:,j+1) |
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| 244 | |
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| 245 | ALLOCATE ( clon(nx+1,ny+1), clat(nx+1,ny+1) ) |
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| 246 | |
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| 247 | ! first the easy internal points |
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| 248 | DO j = 2,ny |
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| 249 | DO i = 2,nx |
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| 250 | ic = i + off(1) - 1 |
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| 251 | jc = j + off(2) - 1 |
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| 252 | clon(i,j) = glamc(ic,jc) |
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| 253 | clat(i,j) = gphic(ic,jc) |
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| 254 | ENDDO |
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| 255 | ENDDO |
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| 256 | |
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| 257 | ! then the tricky boundary points |
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| 258 | imid = (nx-1)/2 + 1 |
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| 259 | DO j = 1,ny+1,ny |
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| 260 | DO i = 1,nx+1,nx |
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| 261 | ic = i + off(1) - 1 |
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| 262 | jc = j + off(2) - 1 |
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| 263 | if (ic == 0 .and. jc == 0) then |
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| 264 | clon(i,j) = glamc(nx,1) |
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| 265 | clat(i,j) = gphic(nx,1) - (gphic(nx,2)-gphic(nx,1)) |
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| 266 | else if (ic == nx+1 .and. jc == 0) then |
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| 267 | clon(i,j) = glamc(1,1) |
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| 268 | clat(i,j) = gphic(1,1) - (gphic(1,2)-gphic(1,1)) |
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| 269 | else if (ic == 0 .and. jc == ny+1) then |
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| 270 | isame = 2*imid - nx + 1 |
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| 271 | clon(i,j) = glamc(isame,jc-1) |
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| 272 | clat(i,j) = gphic(isame,jc-1) |
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| 273 | else if (ic == nx+1 .and. jc == ny+1) then |
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| 274 | isame = 2*imid |
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| 275 | clon(i,j) = glamc(isame,jc-1) |
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| 276 | clat(i,j) = gphic(isame,jc-1) |
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| 277 | else if (ic == 0) then |
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| 278 | clon(i,j) = glamc(nx,jc) |
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| 279 | clat(i,j) = gphic(nx,jc) |
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| 280 | else if (jc == 0) then |
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| 281 | clon(i,j) = glamc(ic,1) |
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| 282 | clat(i,j) = gphic(ic,1) - (gphic(ic,2)-gphic(ic,1)) |
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| 283 | else if (ic == nx+1) then |
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| 284 | clon(i,j) = glamc(1,jc) |
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| 285 | clat(i,j) = gphic(1,jc) |
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| 286 | else if (jc == ny+1) then |
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| 287 | isame = 2*imid - ic + 1 |
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| 288 | clon(i,j) = glamc(isame,jc-1) |
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| 289 | clat(i,j) = gphic(isame,jc-1) |
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| 290 | endif |
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| 291 | ENDDO |
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| 292 | ENDDO |
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| 293 | |
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| 294 | ALLOCATE ( corner_lon(4,nx,ny), corner_lat(4,nx,ny) ) |
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| 295 | |
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| 296 | ! top-right corner |
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| 297 | corner_lon(3,:,:) = clon(2:nx+1,2:ny+1) |
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| 298 | corner_lat(3,:,:) = clat(2:nx+1,2:ny+1) |
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| 299 | |
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| 300 | ! top-left corner |
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| 301 | corner_lon(4,:,:) = clon(1:nx,2:ny+1) |
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| 302 | corner_lat(4,:,:) = clat(1:nx,2:ny+1) |
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| 303 | |
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| 304 | ! bottom-right corner |
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| 305 | corner_lon(2,:,:) = clon(2:nx+1,1:ny) |
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| 306 | corner_lat(2,:,:) = clat(2:nx+1,1:ny) |
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| 307 | |
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| 308 | ! bottom-left corner |
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| 309 | corner_lon(1,:,:) = clon(1:nx,1:ny) |
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| 310 | corner_lat(1,:,:) = clat(1:nx,1:ny) |
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| 311 | |
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| 312 | ! For [N, E, W]-ward extrapolation near the poles, should we use stereographic (or |
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| 313 | ! similar) projection? This issue will come for V,F interpolation, and for all |
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| 314 | ! grids with non-cyclic grids. |
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| 315 | |
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| 316 | ! ----------------------------------------------------------------------------- |
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| 317 | ! correct for 0,2pi longitude crossings |
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| 318 | ! (In practice this means putting all corners into 0,2pi range |
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| 319 | ! and ensuring that no box corners are miles from each other. |
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| 320 | ! 3pi/2 is used as threshold - I think this is quite arbitrary.) |
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| 321 | |
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| 322 | corner_lon(:,:,:) = MODULO( corner_lon(:,:,:), circle ) |
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| 323 | DO n = 2, grid_corners |
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| 324 | WHERE ( corner_lon(n,:,:) - corner_lon(n-1,:,:) < -three*circle*0.25 ) |
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| 325 | corner_lon(n,:,:) = corner_lon(n,:,:) + circle |
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| 326 | ELSEWHERE( corner_lon(n,:,:) - corner_lon(n-1,:,:) > three*circle*0.25 ) |
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| 327 | corner_lon(n,:,:) = corner_lon(n,:,:) - circle |
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| 328 | END WHERE |
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| 329 | END DO |
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| 330 | |
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| 331 | ! ----------------------------------------------------------------------------- |
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| 332 | ! - put longitudes on smooth grid |
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| 333 | |
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| 334 | ! call mouldlon(glam,nx,ny) |
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| 335 | ! call mouldlon(corner_lon(1,:,:),nx,ny) |
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| 336 | ! call mouldlon(corner_lon(2,:,:),nx,ny) |
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| 337 | ! call mouldlon(corner_lon(3,:,:),nx,ny) |
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| 338 | ! call mouldlon(corner_lon(4,:,:),nx,ny) |
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| 339 | |
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| 340 | ! ----------------------------------------------------------------------------- |
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| 341 | ! - reshape for SCRIP input format |
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| 342 | |
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| 343 | ALLOCATE( grid_center_lon(grid_size), grid_center_lat(grid_size) ) |
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| 344 | |
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| 345 | grid_center_lon(:) = RESHAPE( glam(:,:), (/ grid_size /) ) |
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| 346 | grid_center_lat(:) = RESHAPE( gphi(:,:), (/ grid_size /) ) |
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| 347 | |
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| 348 | DEALLOCATE( glam, gphi, glamc, gphic ) |
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| 349 | |
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| 350 | ALLOCATE( grid_corner_lon(4, grid_size), grid_corner_lat(4, grid_size) ) |
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| 351 | |
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| 352 | grid_corner_lon(:,:) = RESHAPE( corner_lon(:,:,:), (/ 4, grid_size /) ) |
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| 353 | grid_corner_lat(:,:) = RESHAPE( corner_lat(:,:,:), (/ 4, grid_size /) ) |
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| 354 | |
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| 355 | DEALLOCATE( corner_lon, corner_lat ) |
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| 356 | |
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| 357 | CALL createSCRIPgrid(grid_file_out, grid_name) |
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| 358 | |
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| 359 | END SUBROUTINE convertNEMO |
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| 360 | |
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| 361 | ! ============================================================================== |
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| 362 | |
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| 363 | SUBROUTINE convertFLUX(grid_file_in, name_lon, name_lat, & |
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| 364 | name_mask, value_mask, grid_file_out) |
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| 365 | |
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| 366 | !----------------------------------------------------------------------- |
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| 367 | ! |
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| 368 | ! This routine creates a remapping grid file from an input grid. |
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| 369 | ! |
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| 370 | !----------------------------------------------------------------------- |
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| 371 | |
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| 372 | CHARACTER(char_len), INTENT(in) :: & |
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| 373 | grid_file_in, name_lon, name_lat, name_mask, grid_file_out |
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| 374 | INTEGER (kind=int_kind) :: value_mask |
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| 375 | |
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| 376 | !----------------------------------------------------------------------- |
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| 377 | ! variables that describe the grid |
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| 378 | |
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| 379 | CHARACTER(char_len), parameter :: & |
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| 380 | grid_name = 'Remapped regular grid for SCRIP' |
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| 381 | |
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| 382 | !----------------------------------------------------------------------- |
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| 383 | ! grid coordinates (note that a flux file just has lon and lat) |
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| 384 | |
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| 385 | REAL (kind=dbl_kind), ALLOCATABLE, DIMENSION(:) :: & |
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| 386 | lam, phi |
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| 387 | REAL (kind=dbl_kind), ALLOCATABLE, DIMENSION(:,:) :: & |
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| 388 | glam, & ! longitude |
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| 389 | gphi, & ! latitude |
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| 390 | glamc, & |
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| 391 | gphic |
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| 392 | REAL (kind=dbl_kind), ALLOCATABLE, DIMENSION(:,:) :: mask |
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| 393 | |
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| 394 | !----------------------------------------------------------------------- |
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| 395 | ! other local variables |
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| 396 | |
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| 397 | INTEGER (kind=int_kind) :: i, j, n, iunit, im1, jm1 |
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| 398 | INTEGER (kind=int_kind) :: varid_lam, varid_phi, varid_mask |
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| 399 | INTEGER (kind=int_kind) :: jdim, nspace |
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| 400 | INTEGER (kind=int_kind), dimension(4) :: grid_dimids ! input fields have 4 dims |
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| 401 | REAL (kind=dbl_kind) :: tmplon, dxt, dyt |
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| 402 | |
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| 403 | !----------------------------------------------------------------------- |
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| 404 | ! read in grid info |
|---|
| 405 | ! |
|---|
| 406 | ! For NEMO input grids, assume that variable names are glam, glamc etc. |
|---|
| 407 | ! Assume that 1st 2 dimensions of these variables are x and y directions. |
|---|
| 408 | ! These assumptions are made by NEMO, so should be valid for coordinates.nc. |
|---|
| 409 | ! |
|---|
| 410 | ! write in nf90 calls (without error handling) and then think about |
|---|
| 411 | ! making more readable by taking chunks into ncutil |
|---|
| 412 | |
|---|
| 413 | ncstat = nf90_open( grid_file_in, NF90_NOWRITE, ncid_in ) |
|---|
| 414 | call netcdf_error_handler(ncstat) |
|---|
| 415 | |
|---|
| 416 | ! find dimids for 'glamt' |
|---|
| 417 | ! use dimids to get dimlengths |
|---|
| 418 | ! allocate glam array |
|---|
| 419 | ! get glam from file |
|---|
| 420 | |
|---|
| 421 | ncstat = nf90_inq_varid( ncid_in, name_lat, varid_phi ) |
|---|
| 422 | call netcdf_error_handler(ncstat) |
|---|
| 423 | ncstat = nf90_inq_varid( ncid_in, name_lon, varid_lam ) |
|---|
| 424 | call netcdf_error_handler(ncstat) |
|---|
| 425 | |
|---|
| 426 | ncstat = nf90_inquire_variable( ncid_in, varid_lam, ndims=nspace ) |
|---|
| 427 | call netcdf_error_handler(ncstat) |
|---|
| 428 | |
|---|
| 429 | if (nspace == 1) then |
|---|
| 430 | ncstat = nf90_inquire_variable( ncid_in, varid_lam, dimids=grid_dimids(:1) ) |
|---|
| 431 | call netcdf_error_handler(ncstat) |
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| 432 | ncstat = nf90_inquire_variable( ncid_in, varid_phi, dimids=grid_dimids(2:) ) |
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| 433 | call netcdf_error_handler(ncstat) |
|---|
| 434 | ncstat = nf90_inquire_dimension( ncid_in, grid_dimids(1), len=grid_dims(1) ) |
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| 435 | call netcdf_error_handler(ncstat) |
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| 436 | ncstat = nf90_inquire_dimension( ncid_in, grid_dimids(2), len=grid_dims(2) ) |
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| 437 | call netcdf_error_handler(ncstat) |
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| 438 | nx = grid_dims(1) |
|---|
| 439 | ny = grid_dims(2) |
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| 440 | grid_size = nx * ny |
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| 441 | WRITE(*,FMT='("Input grid dimensions are:",2i6)') nx, ny |
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| 442 | |
|---|
| 443 | ALLOCATE( lam(nx), phi(ny) ) |
|---|
| 444 | write(6,*) 'double' |
|---|
| 445 | ncstat = nf90_get_var( ncid_in, varid_lam, lam ) |
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| 446 | call netcdf_error_handler(ncstat) |
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| 447 | ncstat = nf90_get_var( ncid_in, varid_phi, phi ) |
|---|
| 448 | call netcdf_error_handler(ncstat) |
|---|
| 449 | |
|---|
| 450 | ALLOCATE( glam(nx,ny), gphi(nx,ny)) |
|---|
| 451 | write(6,*) shape(lam),shape(phi) |
|---|
| 452 | glam(:,:) = SPREAD(lam,2,ny) |
|---|
| 453 | gphi(:,:) = SPREAD(phi,1,nx) |
|---|
| 454 | else |
|---|
| 455 | |
|---|
| 456 | ncstat = nf90_inquire_variable( ncid_in, varid_lam, dimids=grid_dimids(:2) ) |
|---|
| 457 | call netcdf_error_handler(ncstat) |
|---|
| 458 | ncstat = nf90_inquire_dimension( ncid_in, grid_dimids(1), len=grid_dims(1) ) |
|---|
| 459 | call netcdf_error_handler(ncstat) |
|---|
| 460 | ncstat = nf90_inquire_dimension( ncid_in, grid_dimids(2), len=grid_dims(2) ) |
|---|
| 461 | call netcdf_error_handler(ncstat) |
|---|
| 462 | nx = grid_dims(1) |
|---|
| 463 | ny = grid_dims(2) |
|---|
| 464 | grid_size = nx * ny |
|---|
| 465 | WRITE(*,FMT='("Input grid dimensions are:",2i6)') nx, ny |
|---|
| 466 | |
|---|
| 467 | ALLOCATE( glam(nx,ny), gphi(nx,ny)) |
|---|
| 468 | ncstat = nf90_get_var( ncid_in, varid_lam, glam ) |
|---|
| 469 | call netcdf_error_handler(ncstat) |
|---|
| 470 | ncstat = nf90_get_var( ncid_in, varid_phi, gphi ) |
|---|
| 471 | call netcdf_error_handler(ncstat) |
|---|
| 472 | |
|---|
| 473 | endif |
|---|
| 474 | write(6,*) grid_size,nx,ny |
|---|
| 475 | |
|---|
| 476 | ALLOCATE(glamc(0:nx,0:ny), gphic(0:nx,0:ny) ) |
|---|
| 477 | |
|---|
| 478 | ! - for now a simple average to get top right box corners |
|---|
| 479 | ! - glamc(i,j), gphic(i,j) are top right coordinates of box containing |
|---|
| 480 | ! - glam(i,j),gphi(i,j) |
|---|
| 481 | write(6,*) 'averaging' |
|---|
| 482 | write(6,*) size(gphic),size(gphi) |
|---|
| 483 | gphic(1:nx,1:ny-1) = 0.5*(gphi(:,1:ny-1)+gphi(:,2:ny)) |
|---|
| 484 | write(6,*) size(glamc),size(glam) |
|---|
| 485 | glamc(1:nx-1,1:ny) = 0.5*(glam(1:nx-1,:)+glam(2:nx,:)) |
|---|
| 486 | |
|---|
| 487 | ! - left and right column of longitudes |
|---|
| 488 | write(6,*) 'columns' |
|---|
| 489 | glamc(nx,1:ny) = 1.5*glam(nx,:)-0.5*glam(nx-1,:) |
|---|
| 490 | glamc( 0,1:ny) = 1.5*glam(1,:)-0.5*glam(2,:) |
|---|
| 491 | glamc(nx, 0) = glamc(nx,1) |
|---|
| 492 | glamc( 0, 0) = glamc( 0,1) |
|---|
| 493 | |
|---|
| 494 | ! - top and bottom row of latitudes by extrapolation |
|---|
| 495 | write(6,*) 'rows' |
|---|
| 496 | gphic(1:nx,ny) = 1.5*gphi(:,ny)-0.5*gphi(:,ny-1) |
|---|
| 497 | gphic(1:nx, 0) = 1.5*gphi(:,1)-0.5*gphi(:,2) |
|---|
| 498 | gphic( 0,ny) = gphic(1,ny) |
|---|
| 499 | gphic( 0, 0) = gphic(1, 0) |
|---|
| 500 | |
|---|
| 501 | !----------------------------------------------------------------------- |
|---|
| 502 | |
|---|
| 503 | write(6,*) 'allocating' |
|---|
| 504 | ALLOCATE( grid_imask(grid_size) ) |
|---|
| 505 | grid_imask(:) = 1 |
|---|
| 506 | write(6,*) name_mask |
|---|
| 507 | if (trim(name_mask) /= "none") then |
|---|
| 508 | write(6,*) 'masking' |
|---|
| 509 | ncstat = nf90_inq_varid( ncid_in, name_mask, varid_mask ) |
|---|
| 510 | call netcdf_error_handler(ncstat) |
|---|
| 511 | ALLOCATE( mask(nx,ny) ) |
|---|
| 512 | write(6,*) 'reading mask' |
|---|
| 513 | ncstat = nf90_get_var( ncid_in, varid_mask, mask ) |
|---|
| 514 | call netcdf_error_handler(ncstat) |
|---|
| 515 | write(6,*) 'setting mask' |
|---|
| 516 | WHERE ( RESHAPE(mask(:,:),(/ grid_size /)) < value_mask) |
|---|
| 517 | grid_imask = 0 |
|---|
| 518 | END WHERE |
|---|
| 519 | write(6,*) 'masked' |
|---|
| 520 | END IF |
|---|
| 521 | |
|---|
| 522 | !----------------------------------------------------------------------- |
|---|
| 523 | ! corners are arranged as follows: 4 3 |
|---|
| 524 | ! 1 2 |
|---|
| 525 | |
|---|
| 526 | ALLOCATE ( corner_lon(4,nx,ny), corner_lat(4,nx,ny) ) |
|---|
| 527 | |
|---|
| 528 | ! - bottom-left corner |
|---|
| 529 | corner_lon(1,:,:) = glamc(0:nx-1, 0:ny-1 ) |
|---|
| 530 | corner_lat(1,:,:) = gphic(0:nx-1, 0:ny-1 ) |
|---|
| 531 | |
|---|
| 532 | ! - bottom-right corner |
|---|
| 533 | corner_lon(2,:,:) = glamc(1:nx, 0:ny-1 ) |
|---|
| 534 | corner_lat(2,:,:) = gphic(1:nx, 0:ny-1 ) |
|---|
| 535 | |
|---|
| 536 | ! - top-right corner |
|---|
| 537 | corner_lon(3,:,:) = glamc(1:nx,1:ny) |
|---|
| 538 | corner_lat(3,:,:) = gphic(1:nx,1:ny) |
|---|
| 539 | write(6,*) corner_lat(3,nx-2:nx,ny) |
|---|
| 540 | |
|---|
| 541 | ! - top-left corner |
|---|
| 542 | corner_lon(4,:,:) = glamc(0:nx-1, 1:ny ) |
|---|
| 543 | corner_lat(4,:,:) = gphic(0:nx-1, 1:ny ) |
|---|
| 544 | |
|---|
| 545 | ! For [N, E, W]-ward extrapolation near the poles, should we use stereographic (or |
|---|
| 546 | ! similar) projection? This issue will come for V,F interpolation, and for all |
|---|
| 547 | ! grids with non-cyclic grids. |
|---|
| 548 | |
|---|
| 549 | ! ----------------------------------------------------------------------------- |
|---|
| 550 | ! correct for 0,2pi longitude crossings |
|---|
| 551 | ! (In practice this means putting all corners into 0,2pi range |
|---|
| 552 | ! and ensuring that no box corners are miles from each other. |
|---|
| 553 | ! 3pi/2 is used as threshold - I think this is quite arbitrary.) |
|---|
| 554 | |
|---|
| 555 | ! corner_lon(:,:,:) = MODULO( corner_lon(:,:,:), circle ) |
|---|
| 556 | ! DO n = 2, grid_corners |
|---|
| 557 | ! WHERE ( corner_lon(n,:,:) - corner_lon(n-1,:,:) < -three*circle*0.25 ) |
|---|
| 558 | ! corner_lon(n,:,:) = corner_lon(n,:,:) + circle |
|---|
| 559 | ! ELSEWHERE( corner_lon(n,:,:) - corner_lon(n-1,:,:) > three*circle*0.25 ) |
|---|
| 560 | ! corner_lon(n,:,:) = corner_lon(n,:,:) - circle |
|---|
| 561 | ! END WHERE |
|---|
| 562 | ! END DO |
|---|
| 563 | |
|---|
| 564 | ! ----------------------------------------------------------------------------- |
|---|
| 565 | ! - reshape for SCRIP input format |
|---|
| 566 | |
|---|
| 567 | ALLOCATE( grid_center_lon(grid_size), grid_center_lat(grid_size) ) |
|---|
| 568 | |
|---|
| 569 | grid_center_lon(:) = RESHAPE( glam(:,:), (/ grid_size /) ) |
|---|
| 570 | grid_center_lat(:) = RESHAPE( gphi(:,:), (/ grid_size /) ) |
|---|
| 571 | |
|---|
| 572 | DEALLOCATE( glam, gphi, glamc, gphic ) |
|---|
| 573 | |
|---|
| 574 | ALLOCATE( grid_corner_lon(4, grid_size), grid_corner_lat(4, grid_size) ) |
|---|
| 575 | |
|---|
| 576 | grid_corner_lon(:,:) = RESHAPE( corner_lon(:,:,:), (/ 4, grid_size /) ) |
|---|
| 577 | grid_corner_lat(:,:) = RESHAPE( corner_lat(:,:,:), (/ 4, grid_size /) ) |
|---|
| 578 | |
|---|
| 579 | DEALLOCATE( corner_lon, corner_lat ) |
|---|
| 580 | |
|---|
| 581 | CALL createSCRIPgrid(grid_file_out, grid_name) |
|---|
| 582 | |
|---|
| 583 | END SUBROUTINE convertFLUX |
|---|
| 584 | |
|---|
| 585 | ! ============================================================================== |
|---|
| 586 | |
|---|
| 587 | SUBROUTINE mouldlon(lon_grid, nx, ny) |
|---|
| 588 | |
|---|
| 589 | ! ----------------------------------------------------------------------------- |
|---|
| 590 | ! - input variables |
|---|
| 591 | |
|---|
| 592 | INTEGER, INTENT(in) :: nx, ny |
|---|
| 593 | REAL (kind=dbl_kind), INTENT(inout), DIMENSION(nx,ny) :: & |
|---|
| 594 | lon_grid |
|---|
| 595 | |
|---|
| 596 | ! ----------------------------------------------------------------------------- |
|---|
| 597 | ! - local variables |
|---|
| 598 | |
|---|
| 599 | INTEGER :: ix, iy |
|---|
| 600 | REAL (kind=dbl_kind), DIMENSION(:,:), ALLOCATABLE :: & |
|---|
| 601 | dlon |
|---|
| 602 | REAL :: step |
|---|
| 603 | |
|---|
| 604 | ! ----------------------------------------------------------------------------- |
|---|
| 605 | ! - try to eliminate any 360 degree steps in a grid of longitudes |
|---|
| 606 | |
|---|
| 607 | ALLOCATE(dlon(nx,ny)) |
|---|
| 608 | |
|---|
| 609 | step = 0.75*circle |
|---|
| 610 | dlon(:,:) = 0 |
|---|
| 611 | dlon(2:,:) = lon_grid(2:,:) - lon_grid(:nx-1,:) |
|---|
| 612 | WHERE (dlon > -step .AND. dlon < step) |
|---|
| 613 | dlon = 0.0 |
|---|
| 614 | ELSEWHERE |
|---|
| 615 | dlon = -SIGN(circle,dlon) |
|---|
| 616 | END WHERE |
|---|
| 617 | |
|---|
| 618 | ! - close your eyes this is nasty |
|---|
| 619 | DO ix = 2,nx |
|---|
| 620 | dlon(ix,:) = dlon(ix,:) + dlon(ix-1,:) |
|---|
| 621 | END DO |
|---|
| 622 | lon_grid = lon_grid + dlon |
|---|
| 623 | |
|---|
| 624 | END SUBROUTINE mouldlon |
|---|
| 625 | |
|---|
| 626 | ! ============================================================================== |
|---|
| 627 | |
|---|
| 628 | SUBROUTINE createSCRIPgrid(grid_file_out, grid_name) |
|---|
| 629 | |
|---|
| 630 | ! ----------------------------------------------------------------------------- |
|---|
| 631 | ! - input variables |
|---|
| 632 | |
|---|
| 633 | CHARACTER(char_len), INTENT(in) :: & |
|---|
| 634 | grid_name, grid_file_out |
|---|
| 635 | |
|---|
| 636 | ! ----------------------------------------------------------------------------- |
|---|
| 637 | ! - local variables that describe the netcdf file |
|---|
| 638 | |
|---|
| 639 | INTEGER (kind=int_kind) :: & |
|---|
| 640 | nc_grid_id, & ! netCDF grid dataset id |
|---|
| 641 | nc_gridsize_id, & ! netCDF grid size dim id |
|---|
| 642 | nc_gridcorn_id, & ! netCDF grid corner dim id |
|---|
| 643 | nc_gridrank_id, & ! netCDF grid rank dim id |
|---|
| 644 | nc_griddims_id, & ! netCDF grid dimensions id |
|---|
| 645 | nc_grdcntrlat_id, & ! netCDF grid center lat id |
|---|
| 646 | nc_grdcntrlon_id, & ! netCDF grid center lon id |
|---|
| 647 | nc_grdimask_id, & ! netCDF grid mask id |
|---|
| 648 | nc_gridarea_id, & ! netCDF grid area id |
|---|
| 649 | nc_grdcrnrlat_id, & ! netCDF grid corner lat id |
|---|
| 650 | nc_grdcrnrlon_id ! netCDF grid corner lon id |
|---|
| 651 | |
|---|
| 652 | ! ----------------------------------------------------------------------------- |
|---|
| 653 | ! - create netCDF dataset for this grid |
|---|
| 654 | ! - rewrite in nf90 |
|---|
| 655 | ! - (bring out functional blocks into ncclear for readability) |
|---|
| 656 | |
|---|
| 657 | ncstat = nf90_create (grid_file_out, NF90_CLOBBER, nc_grid_id) |
|---|
| 658 | call netcdf_error_handler(ncstat) |
|---|
| 659 | ncstat = nf90_put_att (nc_grid_id, NF90_GLOBAL, 'title', grid_name) |
|---|
| 660 | call netcdf_error_handler(ncstat) |
|---|
| 661 | |
|---|
| 662 | ! ----------------------------------------------------------------------------- |
|---|
| 663 | ! - define grid size dimension |
|---|
| 664 | |
|---|
| 665 | ncstat = nf90_def_dim (nc_grid_id, 'grid_size', grid_size, nc_gridsize_id) |
|---|
| 666 | call netcdf_error_handler(ncstat) |
|---|
| 667 | |
|---|
| 668 | ! ----------------------------------------------------------------------------- |
|---|
| 669 | ! - define grid rank dimension |
|---|
| 670 | |
|---|
| 671 | ncstat = nf90_def_dim (nc_grid_id, 'grid_rank', grid_rank, nc_gridrank_id) |
|---|
| 672 | call netcdf_error_handler(ncstat) |
|---|
| 673 | |
|---|
| 674 | ! ----------------------------------------------------------------------------- |
|---|
| 675 | ! - define grid corner dimension |
|---|
| 676 | |
|---|
| 677 | ncstat = nf90_def_dim (nc_grid_id, 'grid_corners', grid_corners, nc_gridcorn_id) |
|---|
| 678 | call netcdf_error_handler(ncstat) |
|---|
| 679 | |
|---|
| 680 | ! ----------------------------------------------------------------------------- |
|---|
| 681 | ! - define grid dim size array |
|---|
| 682 | |
|---|
| 683 | ncstat = nf90_def_var(nc_grid_id, 'grid_dims', NF90_INT, nc_gridrank_id, nc_griddims_id) |
|---|
| 684 | call netcdf_error_handler(ncstat) |
|---|
| 685 | |
|---|
| 686 | ! ----------------------------------------------------------------------------- |
|---|
| 687 | ! - define grid mask |
|---|
| 688 | |
|---|
| 689 | ncstat = nf90_def_var(nc_grid_id, 'grid_imask', NF90_INT, & |
|---|
| 690 | nc_gridsize_id, nc_grdimask_id) |
|---|
| 691 | call netcdf_error_handler(ncstat) |
|---|
| 692 | ncstat = nf90_put_att(nc_grid_id, nc_grdimask_id, 'units', 'unitless') |
|---|
| 693 | call netcdf_error_handler(ncstat) |
|---|
| 694 | |
|---|
| 695 | ! ----------------------------------------------------------------------------- |
|---|
| 696 | ! - define grid center latitude array |
|---|
| 697 | |
|---|
| 698 | ncstat = nf90_def_var(nc_grid_id, 'grid_center_lat', NF90_DOUBLE, & |
|---|
| 699 | nc_gridsize_id, nc_grdcntrlat_id) |
|---|
| 700 | call netcdf_error_handler(ncstat) |
|---|
| 701 | ncstat = nf90_put_att(nc_grid_id, nc_grdcntrlat_id, 'units', 'degrees') |
|---|
| 702 | call netcdf_error_handler(ncstat) |
|---|
| 703 | |
|---|
| 704 | ! ----------------------------------------------------------------------------- |
|---|
| 705 | ! - define grid center longitude array |
|---|
| 706 | |
|---|
| 707 | ncstat = nf90_def_var(nc_grid_id, 'grid_center_lon', NF90_DOUBLE, & |
|---|
| 708 | nc_gridsize_id, nc_grdcntrlon_id) |
|---|
| 709 | call netcdf_error_handler(ncstat) |
|---|
| 710 | ncstat = nf90_put_att(nc_grid_id, nc_grdcntrlon_id, 'units', 'degrees') |
|---|
| 711 | call netcdf_error_handler(ncstat) |
|---|
| 712 | |
|---|
| 713 | ! ----------------------------------------------------------------------------- |
|---|
| 714 | ! - define grid corner latitude array |
|---|
| 715 | |
|---|
| 716 | grid_dim_ids = (/ nc_gridcorn_id, nc_gridsize_id /) |
|---|
| 717 | ncstat = nf90_def_var(nc_grid_id, 'grid_corner_lat', NF90_DOUBLE, & |
|---|
| 718 | grid_dim_ids, nc_grdcrnrlat_id) |
|---|
| 719 | call netcdf_error_handler(ncstat) |
|---|
| 720 | ncstat = nf90_put_att(nc_grid_id, nc_grdcrnrlat_id, 'units', 'degrees') |
|---|
| 721 | call netcdf_error_handler(ncstat) |
|---|
| 722 | |
|---|
| 723 | ! ----------------------------------------------------------------------------- |
|---|
| 724 | ! - define grid corner longitude array |
|---|
| 725 | |
|---|
| 726 | ncstat = nf90_def_var(nc_grid_id, 'grid_corner_lon', NF90_DOUBLE, & |
|---|
| 727 | grid_dim_ids, nc_grdcrnrlon_id) |
|---|
| 728 | call netcdf_error_handler(ncstat) |
|---|
| 729 | ncstat = nf90_put_att(nc_grid_id, nc_grdcrnrlon_id, 'units', 'degrees') |
|---|
| 730 | call netcdf_error_handler(ncstat) |
|---|
| 731 | |
|---|
| 732 | ! ----------------------------------------------------------------------------- |
|---|
| 733 | ! end definition stage |
|---|
| 734 | |
|---|
| 735 | ncstat = nf90_enddef(nc_grid_id) |
|---|
| 736 | call netcdf_error_handler(ncstat) |
|---|
| 737 | |
|---|
| 738 | ! ----------------------------------------------------------------------------- |
|---|
| 739 | ! write grid data |
|---|
| 740 | |
|---|
| 741 | ncstat = nf90_put_var(nc_grid_id, nc_griddims_id, grid_dims) |
|---|
| 742 | call netcdf_error_handler(ncstat) |
|---|
| 743 | ncstat = nf90_put_var(nc_grid_id, nc_grdimask_id, grid_imask) |
|---|
| 744 | call netcdf_error_handler(ncstat) |
|---|
| 745 | ncstat = nf90_put_var(nc_grid_id, nc_grdcntrlat_id, grid_center_lat) |
|---|
| 746 | call netcdf_error_handler(ncstat) |
|---|
| 747 | ncstat = nf90_put_var(nc_grid_id, nc_grdcntrlon_id, grid_center_lon) |
|---|
| 748 | call netcdf_error_handler(ncstat) |
|---|
| 749 | ncstat = nf90_put_var(nc_grid_id, nc_grdcrnrlat_id, grid_corner_lat) |
|---|
| 750 | call netcdf_error_handler(ncstat) |
|---|
| 751 | ncstat = nf90_put_var(nc_grid_id, nc_grdcrnrlon_id, grid_corner_lon) |
|---|
| 752 | call netcdf_error_handler(ncstat) |
|---|
| 753 | |
|---|
| 754 | ncstat = nf90_close(nc_grid_id) |
|---|
| 755 | call netcdf_error_handler(ncstat) |
|---|
| 756 | |
|---|
| 757 | DEALLOCATE( grid_imask, grid_center_lon, grid_center_lat, & |
|---|
| 758 | grid_corner_lon, grid_corner_lat ) |
|---|
| 759 | |
|---|
| 760 | |
|---|
| 761 | END SUBROUTINE createSCRIPgrid |
|---|
| 762 | |
|---|
| 763 | END MODULE scripgrid_mod |
|---|
| 764 | |
|---|
