| 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: convertPOPT.F90,v 1.9 2004-06-02 23:25:50 eong Exp $ |
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| 9 | ! CVS $Name: $ |
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| 10 | ! |
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| 11 | ! Copyright (c) 1997, 1998 the Regents of the University of |
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| 12 | ! California. |
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| 13 | ! |
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| 14 | ! Unless otherwise indicated, this software has been authored |
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| 15 | ! by an employee or employees of the University of California, |
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| 16 | ! operator of the Los Alamos National Laboratory under Contract |
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| 17 | ! No. W-7405-ENG-36 with the U.S. Department of Energy. The U.S. |
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| 18 | ! Government has rights to use, reproduce, and distribute this |
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| 19 | ! software. The public may copy and use this software without |
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| 20 | ! charge, provided that this Notice and any statement of authorship |
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| 21 | ! are reproduced on all copies. Neither the Government nor the |
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| 22 | ! University makes any warranty, express or implied, or assumes |
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| 23 | ! any liability or responsibility for the use of this software. |
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| 24 | ! |
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| 25 | !*********************************************************************** |
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| 26 | |
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| 27 | subroutine convertPOPT(GGrid, grid_file_in, grid_topo_in, nx, ny) |
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| 28 | |
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| 29 | !----------------------------------------------------------------------- |
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| 30 | ! |
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| 31 | ! This file converts a POP grid.dat file to a remapping grid file. |
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| 32 | ! |
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| 33 | !----------------------------------------------------------------------- |
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| 34 | |
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| 35 | use m_AttrVect,only : AttrVect |
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| 36 | use m_GeneralGrid,only : MCT_GGrid_init => init |
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| 37 | use m_GeneralGrid,only : MCT_GGrid_indexIA => indexIA |
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| 38 | use m_GeneralGrid,only : MCT_GGrid_indexRA => indexRA |
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| 39 | use m_GeneralGrid,only : GeneralGrid |
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| 40 | use m_stdio |
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| 41 | use m_ioutil |
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| 42 | use m_die |
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| 43 | |
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| 44 | |
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| 45 | implicit none |
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| 46 | |
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| 47 | !----------------------------------------------------------------------- |
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| 48 | ! |
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| 49 | ! variables that describe the grid |
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| 50 | ! 4/3 nx = 192, ny = 128 |
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| 51 | ! 2/3 (mod) nx = 384, ny = 288 |
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| 52 | ! x3p Greenland DP nx = 100, ny = 116 |
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| 53 | ! x2p Greenland DP nx = 160, ny = 192 |
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| 54 | ! x1p Greenland DP nx = 320, ny = 384 |
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| 55 | ! |
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| 56 | !----------------------------------------------------------------------- |
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| 57 | |
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| 58 | type(GeneralGrid), intent(out) :: GGrid |
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| 59 | character (len=*), intent(in) :: grid_file_in |
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| 60 | character (len=*), intent(in) :: grid_topo_in |
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| 61 | integer, intent(in) :: nx |
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| 62 | integer, intent(in) :: ny |
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| 63 | |
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| 64 | integer :: grid_size |
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| 65 | |
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| 66 | integer, parameter :: & |
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| 67 | grid_rank = 2, & |
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| 68 | grid_corners = 4 |
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| 69 | |
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| 70 | integer, dimension(2) :: & |
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| 71 | grid_dims ! size of each dimension |
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| 72 | |
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| 73 | !----------------------------------------------------------------------- |
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| 74 | ! |
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| 75 | ! grid coordinates and masks |
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| 76 | ! |
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| 77 | !----------------------------------------------------------------------- |
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| 78 | |
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| 79 | !:: NOTE: The following kind specifiers are needed to read the proper |
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| 80 | !:: values for the POP grid files. The subsequent type conversions |
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| 81 | !:: on these variables may pose a risk. |
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| 82 | |
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| 83 | integer(kind(1)), dimension(:), allocatable :: & |
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| 84 | grid_imask |
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| 85 | |
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| 86 | real, dimension(:), allocatable :: & |
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| 87 | grid_area , &! area as computed in POP |
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| 88 | grid_center_lat, &! lat/lon coordinates for |
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| 89 | grid_center_lon ! each grid center in radians |
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| 90 | |
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| 91 | real(selected_real_kind(13)), dimension(:,:), allocatable :: & |
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| 92 | grid_corner_lat, &! lat/lon coordinates for |
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| 93 | grid_corner_lon ! each grid corner in radians |
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| 94 | |
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| 95 | real(selected_real_kind(13)), dimension(:,:), allocatable :: & |
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| 96 | HTN, HTE ! T-cell grid lengths |
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| 97 | |
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| 98 | !----------------------------------------------------------------------- |
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| 99 | ! |
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| 100 | ! defined constants |
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| 101 | ! |
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| 102 | !----------------------------------------------------------------------- |
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| 103 | |
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| 104 | real(selected_real_kind(13)), parameter :: & |
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| 105 | zero = 0.0, & |
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| 106 | one = 1.0, & |
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| 107 | two = 2.0, & |
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| 108 | three = 3.0, & |
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| 109 | four = 4.0, & |
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| 110 | five = 5.0, & |
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| 111 | half = 0.5, & |
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| 112 | quart = 0.25, & |
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| 113 | bignum = 1.e+20, & |
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| 114 | tiny = 1.e-14, & |
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| 115 | pi = 3.14159265359, & |
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| 116 | pi2 = two*pi, & |
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| 117 | pih = half*pi |
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| 118 | |
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| 119 | real(selected_real_kind(13)), parameter :: & |
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| 120 | radius = 6.37122e8 , & ! radius of Earth (cm) |
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| 121 | area_norm = one/(radius*radius) |
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| 122 | |
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| 123 | !----------------------------------------------------------------------- |
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| 124 | ! |
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| 125 | ! other local variables |
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| 126 | ! |
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| 127 | !----------------------------------------------------------------------- |
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| 128 | |
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| 129 | character(len=*),parameter :: myname_= 'convertPOPT' |
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| 130 | |
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| 131 | integer :: i, j, k, n, p, q, r, ier |
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| 132 | |
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| 133 | integer :: iunit, ocn_add, im1, jm1, np1, np2 |
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| 134 | |
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| 135 | integer :: center_lat, center_lon, & |
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| 136 | corner_lat, corner_lon, & |
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| 137 | imask, area |
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| 138 | |
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| 139 | real :: tmplon, dlat, dxt, dyt |
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| 140 | |
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| 141 | real :: x1, x2, x3, x4, & |
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| 142 | y1, y2, y3, y4, & |
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| 143 | z1, z2, z3, z4, & |
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| 144 | tx, ty, tz, da |
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| 145 | |
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| 146 | grid_size = nx*ny |
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| 147 | |
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| 148 | allocate(grid_imask(grid_size), & |
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| 149 | grid_area(grid_size), & |
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| 150 | grid_center_lat(grid_size), & |
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| 151 | grid_center_lon(grid_size), & |
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| 152 | grid_corner_lat(grid_corners,grid_size), & |
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| 153 | grid_corner_lon(grid_corners,grid_size), & |
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| 154 | HTN(nx,ny), & |
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| 155 | HTE(nx,ny), & |
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| 156 | stat=ier) |
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| 157 | |
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| 158 | if(ier/=0) call die(myname_,"allocate(grid_imask... ", ier) |
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| 159 | |
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| 160 | !----------------------------------------------------------------------- |
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| 161 | ! |
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| 162 | ! read in grid info |
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| 163 | ! lat/lon info is on velocity points which correspond |
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| 164 | ! to the NE corner (in logical space) of the grid cell. |
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| 165 | ! |
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| 166 | !----------------------------------------------------------------------- |
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| 167 | |
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| 168 | iunit = luavail() |
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| 169 | |
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| 170 | open(unit=iunit, file=trim(grid_topo_in), status='old', & |
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| 171 | form='unformatted', access='direct', recl=grid_size*4) |
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| 172 | |
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| 173 | read (unit=iunit,rec=1) grid_imask |
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| 174 | |
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| 175 | call luflush(iunit) |
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| 176 | |
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| 177 | iunit = luavail() |
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| 178 | #if SYSSUPERUX || SYSOSF1 |
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| 179 | open(unit=iunit, file=trim(grid_file_in), status='old', & |
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| 180 | form='unformatted', access='direct', recl=grid_size*2) |
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| 181 | #else |
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| 182 | open(unit=iunit, file=trim(grid_file_in), status='old', & |
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| 183 | form='unformatted', access='direct', recl=grid_size*8) |
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| 184 | #endif |
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| 185 | |
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| 186 | read (unit=iunit, rec=1) grid_corner_lat(3,:) |
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| 187 | read (unit=iunit, rec=2) grid_corner_lon(3,:) |
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| 188 | read (unit=iunit, rec=3) HTN |
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| 189 | read (unit=iunit, rec=4) HTE |
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| 190 | call luflush(iunit) |
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| 191 | |
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| 192 | !:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: |
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| 193 | !::::::::::::TEST DIAGNOSTICS:::::::::::::::::::::::::::::::::: |
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| 194 | !:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: |
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| 195 | |
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| 196 | k=0 |
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| 197 | do j=1,grid_size |
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| 198 | if(grid_imask(j)==0) k=k+1 |
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| 199 | enddo |
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| 200 | |
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| 201 | write(stdout,*) "CONVERTPOPT: NUM_ZEROES(GRID_IMASK), SUM(GRID_IMASK)",& |
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| 202 | k, sum(grid_imask) |
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| 203 | |
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| 204 | write(stdout,*) "CONVERTPOPT: GRID_CORNER_LAT VALUES = ", & |
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| 205 | grid_corner_lat(3,1:10) |
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| 206 | |
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| 207 | write(stdout,*) "CONVERTPOPT: GRID_CORNER_LON VALUES = ", & |
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| 208 | grid_corner_lon(3,1:10) |
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| 209 | |
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| 210 | write(stdout,*) "CONVERTPOPT: HTN VALUES = ", & |
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| 211 | HTN(1,1:10) |
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| 212 | |
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| 213 | write(stdout,*) "CONVERTPOPT: HTE VALUES = ", & |
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| 214 | HTE(1,1:10) |
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| 215 | |
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| 216 | !::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: |
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| 217 | |
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| 218 | grid_dims(1) = nx |
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| 219 | grid_dims(2) = ny |
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| 220 | |
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| 221 | !----------------------------------------------------------------------- |
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| 222 | ! |
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| 223 | ! convert KMT field to integer grid mask |
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| 224 | ! |
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| 225 | !----------------------------------------------------------------------- |
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| 226 | |
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| 227 | grid_imask = min(grid_imask, 1) |
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| 228 | |
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| 229 | !----------------------------------------------------------------------- |
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| 230 | ! |
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| 231 | ! compute remaining corners |
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| 232 | ! |
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| 233 | !----------------------------------------------------------------------- |
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| 234 | |
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| 235 | do j=1,ny |
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| 236 | do i=1,nx |
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| 237 | ocn_add = (j-1)*nx + i |
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| 238 | if (i .ne. 1) then |
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| 239 | im1 = ocn_add - 1 |
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| 240 | else |
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| 241 | im1 = ocn_add + nx - 1 |
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| 242 | endif |
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| 243 | |
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| 244 | grid_corner_lat(4,ocn_add) = grid_corner_lat(3,im1) |
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| 245 | grid_corner_lon(4,ocn_add) = grid_corner_lon(3,im1) |
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| 246 | end do |
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| 247 | end do |
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| 248 | |
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| 249 | do j=2,ny |
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| 250 | do i=1,nx |
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| 251 | ocn_add = (j-1)*nx + i |
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| 252 | jm1 = (j-2)*nx + i |
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| 253 | |
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| 254 | grid_corner_lat(2,ocn_add) = grid_corner_lat(3,jm1) |
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| 255 | grid_corner_lat(1,ocn_add) = grid_corner_lat(4,jm1) |
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| 256 | |
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| 257 | grid_corner_lon(2,ocn_add) = grid_corner_lon(3,jm1) |
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| 258 | grid_corner_lon(1,ocn_add) = grid_corner_lon(4,jm1) |
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| 259 | end do |
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| 260 | end do |
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| 261 | |
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| 262 | !----------------------------------------------------------------------- |
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| 263 | ! |
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| 264 | ! mock up the lower row boundaries |
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| 265 | ! |
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| 266 | !----------------------------------------------------------------------- |
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| 267 | |
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| 268 | do i=1,nx |
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| 269 | dlat = grid_corner_lat(1,i+2*nx) - grid_corner_lat(1,i+nx) |
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| 270 | grid_corner_lat(1,i) = grid_corner_lat(1,i+nx) - dlat |
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| 271 | grid_corner_lat(1,i) = max(grid_corner_lat(1,i), -pih + tiny) |
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| 272 | |
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| 273 | dlat = grid_corner_lat(2,i+2*nx) - grid_corner_lat(2,i+nx) |
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| 274 | grid_corner_lat(2,i) = grid_corner_lat(2,i+nx) - dlat |
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| 275 | grid_corner_lat(2,i) = max(grid_corner_lat(2,i), -pih + tiny) |
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| 276 | |
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| 277 | grid_corner_lon(1,i) = grid_corner_lon(4,i) |
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| 278 | grid_corner_lon(2,i) = grid_corner_lon(3,i) |
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| 279 | end do |
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| 280 | |
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| 281 | !----------------------------------------------------------------------- |
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| 282 | ! |
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| 283 | ! correct for 0,2pi longitude crossings |
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| 284 | ! |
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| 285 | !----------------------------------------------------------------------- |
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| 286 | |
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| 287 | do ocn_add=1,grid_size |
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| 288 | if (grid_corner_lon(1,ocn_add) > pi2) & |
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| 289 | grid_corner_lon(1,ocn_add) = & |
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| 290 | grid_corner_lon(1,ocn_add) - pi2 |
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| 291 | if (grid_corner_lon(1,ocn_add) < 0.0) & |
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| 292 | grid_corner_lon(1,ocn_add) = & |
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| 293 | grid_corner_lon(1,ocn_add) + pi2 |
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| 294 | do n=2,grid_corners |
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| 295 | tmplon = grid_corner_lon(n ,ocn_add) - & |
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| 296 | grid_corner_lon(n-1,ocn_add) |
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| 297 | if (tmplon < -three*pih) grid_corner_lon(n,ocn_add) = & |
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| 298 | grid_corner_lon(n,ocn_add) + pi2 |
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| 299 | if (tmplon > three*pih) grid_corner_lon(n,ocn_add) = & |
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| 300 | grid_corner_lon(n,ocn_add) - pi2 |
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| 301 | end do |
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| 302 | end do |
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| 303 | |
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| 304 | !----------------------------------------------------------------------- |
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| 305 | ! |
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| 306 | ! compute ocean cell centers by averaging corner values |
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| 307 | ! |
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| 308 | !----------------------------------------------------------------------- |
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| 309 | |
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| 310 | do ocn_add=1,grid_size |
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| 311 | z1 = cos(grid_corner_lat(1,ocn_add)) |
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| 312 | x1 = cos(grid_corner_lon(1,ocn_add))*z1 |
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| 313 | y1 = sin(grid_corner_lon(1,ocn_add))*z1 |
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| 314 | z1 = sin(grid_corner_lat(1,ocn_add)) |
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| 315 | |
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| 316 | z2 = cos(grid_corner_lat(2,ocn_add)) |
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| 317 | x2 = cos(grid_corner_lon(2,ocn_add))*z2 |
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| 318 | y2 = sin(grid_corner_lon(2,ocn_add))*z2 |
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| 319 | z2 = sin(grid_corner_lat(2,ocn_add)) |
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| 320 | |
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| 321 | z3 = cos(grid_corner_lat(3,ocn_add)) |
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| 322 | x3 = cos(grid_corner_lon(3,ocn_add))*z3 |
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| 323 | y3 = sin(grid_corner_lon(3,ocn_add))*z3 |
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| 324 | z3 = sin(grid_corner_lat(3,ocn_add)) |
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| 325 | |
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| 326 | z4 = cos(grid_corner_lat(4,ocn_add)) |
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| 327 | x4 = cos(grid_corner_lon(4,ocn_add))*z4 |
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| 328 | y4 = sin(grid_corner_lon(4,ocn_add))*z4 |
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| 329 | z4 = sin(grid_corner_lat(4,ocn_add)) |
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| 330 | |
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| 331 | tx = (x1+x2+x3+x4)/4.0 |
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| 332 | ty = (y1+y2+y3+y4)/4.0 |
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| 333 | tz = (z1+z2+z3+z4)/4.0 |
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| 334 | da = sqrt(tx**2+ty**2+tz**2) |
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| 335 | |
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| 336 | tz = tz/da |
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| 337 | ! grid_center_lon in radians |
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| 338 | grid_center_lon(ocn_add) = 0.0 |
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| 339 | if (tx .ne. 0.0 .or. ty .ne. 0.0) & |
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| 340 | grid_center_lon(ocn_add) = atan2(ty,tx) |
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| 341 | ! grid_center_lat in radians |
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| 342 | grid_center_lat(ocn_add) = asin(tz) |
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| 343 | |
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| 344 | end do |
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| 345 | |
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| 346 | ! j=1: linear approximation |
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| 347 | n = 0 |
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| 348 | do i=1,nx |
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| 349 | n = n + 1 |
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| 350 | np1 = n + nx |
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| 351 | np2 = n + 2*nx |
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| 352 | grid_center_lon(n) = grid_center_lon(np1) |
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| 353 | grid_center_lat(n) = 2.0*grid_center_lat(np1) - & |
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| 354 | grid_center_lat(np2) |
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| 355 | end do |
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| 356 | |
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| 357 | do ocn_add=1,grid_size |
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| 358 | if (grid_center_lon(ocn_add) > pi2) & |
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| 359 | grid_center_lon(ocn_add) = grid_center_lon(ocn_add) - pi2 |
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| 360 | if (grid_center_lon(ocn_add) < 0.0) & |
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| 361 | grid_center_lon(ocn_add) = grid_center_lon(ocn_add) + pi2 |
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| 362 | enddo |
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| 363 | |
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| 364 | !----------------------------------------------------------------------- |
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| 365 | ! |
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| 366 | ! compute cell areas in same way as POP |
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| 367 | ! |
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| 368 | !----------------------------------------------------------------------- |
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| 369 | |
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| 370 | n = 0 |
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| 371 | do j=1,ny |
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| 372 | if (j > 1) then |
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| 373 | jm1 = j-1 |
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| 374 | else |
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| 375 | jm1 = 1 |
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| 376 | endif |
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| 377 | do i=1,nx |
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| 378 | if (i > 1) then |
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| 379 | im1 = i-1 |
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| 380 | else |
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| 381 | im1 = nx |
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| 382 | endif |
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| 383 | |
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| 384 | n = n+1 |
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| 385 | |
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| 386 | dxt = half*(HTN(i,j) + HTN(i,jm1)) |
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| 387 | dyt = half*(HTE(i,j) + HTE(im1,j)) |
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| 388 | if (dxt == zero) dxt=one |
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| 389 | if (dyt == zero) dyt=one |
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| 390 | |
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| 391 | grid_area(n) = dxt*dyt*area_norm |
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| 392 | end do |
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| 393 | end do |
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| 394 | |
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| 395 | !----------------------------------------------------------------------- |
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| 396 | ! |
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| 397 | ! intialize GeneralGrid |
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| 398 | ! |
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| 399 | !----------------------------------------------------------------------- |
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| 400 | |
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| 401 | call MCT_GGrid_init(GGrid=GGrid, & |
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| 402 | CoordChars="grid_center_lat:& |
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| 403 | &grid_center_lon", & |
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| 404 | WeightChars="grid_area", & |
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| 405 | OtherChars="grid_corner_lat_1:& |
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| 406 | &grid_corner_lat_2:& |
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| 407 | &grid_corner_lat_3:& |
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| 408 | &grid_corner_lat_4:& |
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| 409 | &grid_corner_lon_1:& |
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| 410 | &grid_corner_lon_2:& |
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| 411 | &grid_corner_lon_3:& |
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| 412 | &grid_corner_lon_4", & |
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| 413 | IndexChars="grid_imask", & |
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| 414 | lsize=grid_size) |
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| 415 | |
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| 416 | center_lat = MCT_GGrid_indexRA(GGrid,'grid_center_lat') |
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| 417 | center_lon = MCT_GGrid_indexRA(GGrid,'grid_center_lon') |
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| 418 | corner_lat = MCT_GGrid_indexRA(GGrid,'grid_corner_lat_1') |
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| 419 | corner_lon = MCT_GGrid_indexRA(GGrid,'grid_corner_lon_1') |
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| 420 | area = MCT_GGrid_indexRA(GGrid,'grid_area') |
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| 421 | imask = MCT_GGrid_indexIA(GGrid,'grid_imask') |
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| 422 | |
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| 423 | GGrid%data%rattr(center_lat,1:grid_size) = & |
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| 424 | grid_center_lat(1:grid_size) |
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| 425 | GGrid%data%rattr(center_lon,1:grid_size) = & |
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| 426 | grid_center_lon(1:grid_size) |
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| 427 | GGrid%data%rattr(area,1:grid_size) = & |
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| 428 | grid_area(1:grid_size) |
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| 429 | GGrid%data%iattr(imask,1:grid_size) = & |
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| 430 | grid_imask(1:grid_size) |
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| 431 | |
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| 432 | do p = 1,grid_corners |
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| 433 | GGrid%data%rattr(corner_lat+p-1,1:grid_size) = & |
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| 434 | grid_corner_lat(p,1:grid_size) |
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| 435 | GGrid%data%rattr(corner_lon+p-1,1:grid_size) = & |
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| 436 | grid_corner_lon(p,1:grid_size) |
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| 437 | enddo |
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| 438 | |
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| 439 | deallocate(grid_imask, grid_area, & |
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| 440 | grid_center_lat, grid_center_lon, & |
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| 441 | grid_corner_lat, grid_corner_lon, & |
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| 442 | HTN, HTE, stat=ier) |
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| 443 | |
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| 444 | if(ier/=0) call die(myname_,"deallocate(grid_imask... ", ier) |
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| 445 | |
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| 446 | |
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| 447 | !*********************************************************************** |
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| 448 | |
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| 449 | end subroutine convertPOPT |
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| 450 | |
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| 451 | !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! |
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| 452 | |
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| 453 | |
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| 454 | |
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