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! $Id$ |
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module regr_pr_int_m |
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! Author: Lionel GUEZ |
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implicit none |
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contains |
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subroutine regr_pr_int(ncid, name, julien, plev, pplay, top_value, v3) |
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! "regr_pr_int" stands for "regrid pressure interpolation". |
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! In this procedure: |
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! -- the root process reads a 2D latitude-pressure field from a |
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! NetCDF file, at a given day. |
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! -- the field is packed to the LMDZ horizontal "physics" |
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! grid and scattered to all threads of all processes; |
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! -- in all the threads of all the processes, the field is regridded in |
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! pressure to the LMDZ vertical grid. |
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! We assume that, in the input file, the field has 3 dimensions: |
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! latitude, pressure, julian day. |
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! We assume that latitudes are in ascending order in the input file. |
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! The target vertical LMDZ grid is the grid of mid-layers. |
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! Regridding is by linear interpolation. |
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use dimphy, only: klon |
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use netcdf95, only: nf95_inq_varid, handle_err |
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use netcdf, only: nf90_get_var |
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use assert_m, only: assert |
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use regr_lint_m, only: regr_lint |
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use mod_phys_lmdz_mpi_data, only: is_mpi_root |
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use mod_grid_phy_lmdz, only: nbp_lon, nbp_lat, nbp_lev |
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use mod_phys_lmdz_transfert_para, only: scatter2d |
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! (pack to the LMDZ horizontal "physics" grid and scatter) |
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integer, intent(in):: ncid ! NetCDF ID of the file |
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character(len=*), intent(in):: name ! of the NetCDF variable |
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integer, intent(in):: julien ! jour julien, 1 <= julien <= 360 |
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real, intent(in):: plev(:) |
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! (pressure level of input data, in Pa, in strictly ascending order) |
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real, intent(in):: pplay(:, :) ! (klon, nbp_lev) |
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! (pression pour le mileu de chaque couche, en Pa) |
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real, intent(in):: top_value |
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! (extra value of field at 0 pressure) |
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real, intent(out):: v3(:, :) ! (klon, nbp_lev) |
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! (regridded field on the partial "physics" grid) |
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! ("v3(i, k)" is at longitude "xlon(i)", latitude |
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! "xlat(i)", middle of layer "k".) |
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! Variables local to the procedure: |
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integer varid, ncerr ! for NetCDF |
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real v1(nbp_lon, nbp_lat, 0:size(plev)) |
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! (input field at day "julien", on the global "dynamics" horizontal grid) |
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! (First dimension is for longitude. |
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! The value is the same for all longitudes. |
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! "v1(:, j, k >=1)" is at latitude "rlatu(j)" and pressure "plev(k)".) |
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real v2(klon, 0:size(plev)) |
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! (field scattered to the partial "physics" horizontal grid) |
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! "v2(i, k >= 1)" is at longitude "xlon(i)", latitude "xlat(i)" |
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! and pressure "plev(k)".) |
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integer i |
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!-------------------------------------------- |
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call assert(shape(v3) == (/klon, nbp_lev/), "regr_pr_int v3") |
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call assert(shape(pplay) == (/klon, nbp_lev/), "regr_pr_int pplay") |
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!$omp master |
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if (is_mpi_root) then |
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call nf95_inq_varid(ncid, name, varid) |
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! Get data at the right day from the input file: |
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ncerr = nf90_get_var(ncid, varid, v1(1, :, 1:), start=(/1, 1, julien/)) |
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call handle_err("regr_pr_int nf90_get_var " // name, ncerr, ncid) |
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! Latitudes are in ascending order in the input file while |
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! "rlatu" is in descending order so we need to invert order: |
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v1(1, :, 1:) = v1(1, nbp_lat:1:-1, 1:) |
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! Complete "v1" with the value at 0 pressure: |
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v1(1, :, 0) = top_value |
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! Duplicate on all longitudes: |
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v1(2:, :, :) = spread(v1(1, :, :), dim=1, ncopies=nbp_lon-1) |
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end if |
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!$omp end master |
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call scatter2d(v1, v2) |
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! Regrid in pressure at each horizontal position: |
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do i = 1, klon |
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call regr_lint(1, v2(i, :), (/0., plev/), pplay(i, nbp_lev:1:-1), & |
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v3(i, nbp_lev:1:-1)) |
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! (invert order of indices because "pplay" is in descending order) |
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end do |
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end subroutine regr_pr_int |
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end module regr_pr_int_m |
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