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module regr_pr_o3_m |
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implicit none |
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contains |
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subroutine regr_pr_o3(p3d, o3_mob_regr) |
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! "regr_pr_o3" stands for "regrid pressure ozone". |
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! This procedure reads Mobidic ozone mole fraction from |
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! "coefoz_LMDZ.nc" at the initial day and regrids it in pressure. |
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! Ozone mole fraction from "coefoz_LMDZ.nc" is a 2D latitude -- |
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! pressure variable. |
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! The target horizontal LMDZ grid is the "scalar" grid: "rlonv", "rlatu". |
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! The target vertical LMDZ grid is the grid of layer boundaries. |
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! We assume that the input variable is already on the LMDZ "rlatu" |
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! latitude grid. |
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! The input variable does not depend on longitude, but the |
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! pressure at LMDZ layers does. |
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! Therefore, the values on the LMDZ grid do depend on longitude. |
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! Regridding is by averaging, assuming a step function. |
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! We assume that, in the input file, the pressure levels are in |
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! hPa and strictly increasing. |
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use conf_gcm_m, only: dayref |
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use dimens_m, only: iim, jjm, llm |
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use netcdf95, only: nf95_open, nf95_close, nf95_inq_varid, handle_err, & |
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nf95_gw_var |
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use netcdf, only: nf90_nowrite, nf90_get_var |
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use nr_util, only: assert |
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use grid_change, only: dyn_phy |
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use numer_rec_95, only: regr1_step_av |
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REAL, intent(in):: p3d(:, :, :) ! (iim + 1, jjm + 1, llm+1) |
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! pressure at layer interfaces, in Pa |
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! ("p3d(i, j, l)" is at longitude "rlonv(i)", latitude "rlatu(j)", |
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! for interface "l") |
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real, intent(out):: o3_mob_regr(:, :, :) ! (iim + 1, jjm + 1, llm) |
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! (ozone mole fraction from Mobidic adapted to the LMDZ grid) |
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! ("o3_mob_regr(i, j, l)" is at longitude "rlonv(i)", latitude |
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! "rlatu(j)" and pressure level "pls(i, j, l)") |
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! Variables local to the procedure: |
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real, pointer:: plev(:) |
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! (pressure levels of Mobidic data, in Pa, in strictly increasing order) |
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real, allocatable:: press_in_edg(:) |
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! (edges of pressure intervals for Mobidic data, in Pa, in strictly |
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! increasing order) |
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integer ncid, varid, ncerr ! for NetCDF |
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integer n_plev ! number of pressure levels in Mobidic data |
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integer i, j |
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real, allocatable:: r_mob(:, :)! (jjm + 1, n_plev) |
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! (ozone mole fraction from Mobidic at day "dayref") |
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! (r_mob(j, k) is at latitude "rlatu(j)" and pressure level "plev(k)".) |
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!------------------------------------------------------------ |
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print *, "Call sequence information: regr_pr_o3" |
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call assert(shape(o3_mob_regr) == (/iim + 1, jjm + 1, llm/), & |
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"regr_pr_o3 o3_mob_regr") |
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call assert(shape(p3d) == (/iim + 1, jjm + 1, llm + 1/), & |
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"regr_pr_o3 p3d") |
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call nf95_open("coefoz_LMDZ.nc", nf90_nowrite, ncid) |
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call nf95_inq_varid(ncid, "plev", varid) |
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call nf95_gw_var(ncid, varid, plev) |
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! Convert from hPa to Pa because "regr_pr_av" requires so: |
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plev = plev * 100. |
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n_plev = size(plev) |
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! Compute edges of pressure intervals: |
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allocate(press_in_edg(n_plev + 1)) |
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press_in_edg(1) = 0. |
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! We choose edges halfway in logarithm: |
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forall (j = 2:n_plev) press_in_edg(j) = sqrt(plev(j - 1) * plev(j)) |
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press_in_edg(n_plev + 1) = huge(0.) |
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! (infinity, but any value guaranteed to be greater than the |
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! surface pressure would do) |
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deallocate(plev) ! pointer |
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call nf95_inq_varid(ncid, "r_Mob", varid) |
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allocate(r_mob(jjm + 1, n_plev)) |
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! Get data at the right day from the input file: |
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ncerr = nf90_get_var(ncid, varid, r_mob, start=(/1, 1, dayref/)) |
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call handle_err("nf90_get_var r_Mob", ncerr) |
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! Latitudes are in increasing order in the input file while |
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! "rlatu" is in decreasing order so we need to invert order: |
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r_mob = r_mob(jjm+1:1:-1, :) |
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call nf95_close(ncid) |
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! Regrid in pressure by averaging a step function of pressure: |
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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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o3_mob_regr(i, j, llm:1:-1) & |
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= regr1_step_av(r_mob(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 decreasing) |
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end if |
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end do |
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end do |
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! Duplicate pole values on all longitudes: |
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o3_mob_regr(2:, 1, :) = spread(o3_mob_regr(1, 1, :), dim=1, ncopies=iim) |
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o3_mob_regr(2:, jjm + 1, :) & |
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= spread(o3_mob_regr(1, jjm + 1, :), dim=1, ncopies=iim) |
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! Duplicate first longitude to last longitude: |
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o3_mob_regr(iim + 1, 2:jjm, :) = o3_mob_regr(1, 2:jjm, :) |
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end subroutine regr_pr_o3 |
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end module regr_pr_o3_m |
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