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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, pplay, top_value, v3) |
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! "regr_pr_int" stands for "regrid pressure interpolation". |
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! This procedure reads a 2D latitude-pressure field from a NetCDF |
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! file, at a given day, regrids the field in pressure to the LMDZ |
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! vertical grid and packs it to the LMDZ horizontal "physics" |
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! grid. We assume that, in the input file, the field has 3 |
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! dimensions: latitude, pressure, julian day. We assume that |
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! latitudes are in ascending order in the input file. We assume |
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! that the input data is already on the LMDZ "rlatu" latitude |
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! grid. |
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! The target vertical LMDZ grid is the grid of mid-layers. The |
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! input data does not depend on longitude, but the pressure at |
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! LMDZ mid-layers does. Therefore, the values on the LMDZ grid do |
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! depend on longitude. Regridding is by linear interpolation. |
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use dimens_m, only: iim, jjm, llm |
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use dimphy, only: klon |
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use grid_change, only: gr_dyn_phy |
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use netcdf95, only: nf95_inq_varid, nf95_get_var |
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use nr_util, only: assert |
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use numer_rec_95, only: regr1_lint |
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use press_coefoz_m, only: plev |
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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):: pplay(:, :) ! (klon, llm) |
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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, llm) |
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! Regridded field on the partial "physics" grid. "v3(i, k)" is at |
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! longitude "xlon(i)", latitude "xlat(i)", middle of layer "k". |
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! Variables local to the procedure: |
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integer varid ! for NetCDF |
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real v1(jjm + 1, 0:size(plev)) |
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! Input field at day "julien". "v1(j, k >=1)" is at latitude |
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! "rlatu(j)" and pressure "plev(k)". |
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real v2(klon, 0:size(plev)) |
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! Field on the "physics" horizontal grid. "v2(i, k >= 1)" is at |
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! longitude "xlon(i)", latitude "xlat(i)" and pressure "plev(k)".) |
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integer i |
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!-------------------------------------------- |
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call assert(shape(v3) == (/klon, llm/), "regr_pr_int") |
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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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call nf95_get_var(ncid, varid, v1(:, 1:), start=(/1, 1, julien/)) |
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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:) = v1(jjm+1:1:-1, 1:) |
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! Complete "v1" with the value at 0 pressure: |
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v1(:, 0) = top_value |
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v2 = gr_dyn_phy(spread(v1, dim = 1, ncopies = iim + 1)) |
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! Regrid in pressure at each horizontal position: |
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do i = 1, klon |
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v3(i, llm:1:-1) = regr1_lint(v2(i, :), (/0., plev/), pplay(i, llm: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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