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module regr_pr_av_m |
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implicit none |
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contains |
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subroutine regr_pr_av(ncid, name, julien, v3) |
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! "regr_pr_av" stands for "regrid pressure averaging". |
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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 this 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. |
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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 the input field is already on the LMDZ "rlatu" |
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! latitudes, except that latitudes are in ascending order in the |
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! input file. |
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! The target vertical LMDZ grid is the grid of layer boundaries. |
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! Regridding in pressure is done by averaging a step function of pressure. |
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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: 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_step_av |
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use press_coefoz_m, only: press_in_edg |
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use pressure_var, only: p3d |
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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(out):: v3(:, :) ! (klon, llm) |
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! regridded field on the partial "physics" grid |
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! "v3(i, k)" is at longitude "xlon(i)", latitude "xlat(i)", in |
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! 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, size(press_in_edg) - 1) |
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! input field at day "julien" |
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! "v1(j, k)" is at latitude "rlatu(j)" and for |
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! pressure interval "[press_in_edg(k), press_in_edg(k+1)]". |
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real v2(iim + 1, jjm + 1, llm) |
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! regridded field on the "dynamics" grid |
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! ("v2(i, j, k)" is at longitude "rlonv(i)", latitude |
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! "rlatu(j)" and for pressure interval "[p3d(i, j, k+1), p3d(i, j, k)]".) |
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integer i, j, k |
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!-------------------------------------------- |
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call assert(shape(v3) == (/klon, llm/), "regr_pr_av") |
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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, 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 = v1(jjm+1:1:-1, :) |
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! Regrid in pressure at each horizontal position: |
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do j = 1, jjm + 1 |
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do i = 1, iim |
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if (dyn_phy(i, j)) then |
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v2(i, j, llm:1:-1) & |
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= regr1_step_av(v1(j, :), press_in_edg, & |
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p3d(i, j, llm+1:1:-1)) |
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! (invert order of indices because "p3d" is in descending order) |
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end if |
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end do |
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end do |
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forall (k = 1:llm) v3(:, k) = pack(v2(:, :, k), dyn_phy) |
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end subroutine regr_pr_av |
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end module regr_pr_av_m |
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