| 1 |
module regr_pr_o3_m |
| 2 |
|
| 3 |
implicit none |
| 4 |
|
| 5 |
contains |
| 6 |
|
| 7 |
subroutine regr_pr_o3(p3d, o3_mob_regr) |
| 8 |
|
| 9 |
! "regr_pr_o3" stands for "regrid pressure ozone". |
| 10 |
! This procedure reads Mobidic ozone mole fraction from |
| 11 |
! "coefoz_LMDZ.nc" at the initial day and regrids it in pressure. |
| 12 |
! Ozone mole fraction from "coefoz_LMDZ.nc" is a 2D latitude -- |
| 13 |
! pressure variable. |
| 14 |
! The target horizontal LMDZ grid is the "scalar" grid: "rlonv", "rlatu". |
| 15 |
! The target vertical LMDZ grid is the grid of layer boundaries. |
| 16 |
! We assume that the input variable is already on the LMDZ "rlatu" |
| 17 |
! latitude grid. |
| 18 |
! The input variable does not depend on longitude, but the |
| 19 |
! pressure at LMDZ layers does. |
| 20 |
! Therefore, the values on the LMDZ grid do depend on longitude. |
| 21 |
! Regridding is by averaging, assuming a step function. |
| 22 |
! We assume that, in the input file, the pressure levels are in |
| 23 |
! hPa and strictly increasing. |
| 24 |
|
| 25 |
use conf_gcm_m, only: dayref |
| 26 |
use dimens_m, only: iim, jjm, llm |
| 27 |
use netcdf95, only: nf95_open, nf95_close, nf95_inq_varid, handle_err, & |
| 28 |
nf95_gw_var |
| 29 |
use netcdf, only: nf90_nowrite, nf90_get_var |
| 30 |
use nr_util, only: assert |
| 31 |
use grid_change, only: dyn_phy |
| 32 |
use numer_rec_95, only: regr1_step_av |
| 33 |
|
| 34 |
REAL, intent(in):: p3d(:, :, :) ! (iim + 1, jjm + 1, llm+1) |
| 35 |
! pressure at layer interfaces, in Pa |
| 36 |
! ("p3d(i, j, l)" is at longitude "rlonv(i)", latitude "rlatu(j)", |
| 37 |
! for interface "l") |
| 38 |
|
| 39 |
real, intent(out):: o3_mob_regr(:, :, :) ! (iim + 1, jjm + 1, llm) |
| 40 |
! (ozone mole fraction from Mobidic adapted to the LMDZ grid) |
| 41 |
! ("o3_mob_regr(i, j, l)" is at longitude "rlonv(i)", latitude |
| 42 |
! "rlatu(j)" and pressure level "pls(i, j, l)") |
| 43 |
|
| 44 |
! Variables local to the procedure: |
| 45 |
|
| 46 |
real, pointer:: plev(:) |
| 47 |
! (pressure levels of Mobidic data, in Pa, in strictly increasing order) |
| 48 |
|
| 49 |
real, allocatable:: press_in_edg(:) |
| 50 |
! (edges of pressure intervals for Mobidic data, in Pa, in strictly |
| 51 |
! increasing order) |
| 52 |
|
| 53 |
integer ncid, varid, ncerr ! for NetCDF |
| 54 |
integer n_plev ! number of pressure levels in Mobidic data |
| 55 |
integer i, j |
| 56 |
|
| 57 |
real, allocatable:: r_mob(:, :)! (jjm + 1, n_plev) |
| 58 |
! (ozone mole fraction from Mobidic at day "dayref") |
| 59 |
! (r_mob(j, k) is at latitude "rlatu(j)" and pressure level "plev(k)".) |
| 60 |
|
| 61 |
!------------------------------------------------------------ |
| 62 |
|
| 63 |
print *, "Call sequence information: regr_pr_o3" |
| 64 |
|
| 65 |
call assert(shape(o3_mob_regr) == (/iim + 1, jjm + 1, llm/), & |
| 66 |
"regr_pr_o3 o3_mob_regr") |
| 67 |
call assert(shape(p3d) == (/iim + 1, jjm + 1, llm + 1/), & |
| 68 |
"regr_pr_o3 p3d") |
| 69 |
|
| 70 |
call nf95_open("coefoz_LMDZ.nc", nf90_nowrite, ncid) |
| 71 |
|
| 72 |
call nf95_inq_varid(ncid, "plev", varid) |
| 73 |
call nf95_gw_var(ncid, varid, plev) |
| 74 |
! Convert from hPa to Pa because "regr_pr_av" requires so: |
| 75 |
plev = plev * 100. |
| 76 |
n_plev = size(plev) |
| 77 |
|
| 78 |
! Compute edges of pressure intervals: |
| 79 |
allocate(press_in_edg(n_plev + 1)) |
| 80 |
press_in_edg(1) = 0. |
| 81 |
! We choose edges halfway in logarithm: |
| 82 |
forall (j = 2:n_plev) press_in_edg(j) = sqrt(plev(j - 1) * plev(j)) |
| 83 |
press_in_edg(n_plev + 1) = huge(0.) |
| 84 |
! (infinity, but any value guaranteed to be greater than the |
| 85 |
! surface pressure would do) |
| 86 |
|
| 87 |
deallocate(plev) ! pointer |
| 88 |
|
| 89 |
call nf95_inq_varid(ncid, "r_Mob", varid) |
| 90 |
allocate(r_mob(jjm + 1, n_plev)) |
| 91 |
|
| 92 |
! Get data at the right day from the input file: |
| 93 |
ncerr = nf90_get_var(ncid, varid, r_mob, start=(/1, 1, dayref/)) |
| 94 |
call handle_err("nf90_get_var r_Mob", ncerr) |
| 95 |
! Latitudes are in increasing order in the input file while |
| 96 |
! "rlatu" is in decreasing order so we need to invert order: |
| 97 |
r_mob = r_mob(jjm+1:1:-1, :) |
| 98 |
|
| 99 |
call nf95_close(ncid) |
| 100 |
|
| 101 |
! Regrid in pressure by averaging a step function of pressure: |
| 102 |
do j = 1, jjm + 1 |
| 103 |
do i = 1, iim |
| 104 |
if (dyn_phy(i, j)) then |
| 105 |
o3_mob_regr(i, j, llm:1:-1) & |
| 106 |
= regr1_step_av(r_mob(j, :), press_in_edg, & |
| 107 |
p3d(i, j, llm+1:1:-1)) |
| 108 |
! (invert order of indices because "p3d" is decreasing) |
| 109 |
end if |
| 110 |
end do |
| 111 |
end do |
| 112 |
|
| 113 |
! Duplicate pole values on all longitudes: |
| 114 |
o3_mob_regr(2:, 1, :) = spread(o3_mob_regr(1, 1, :), dim=1, ncopies=iim) |
| 115 |
o3_mob_regr(2:, jjm + 1, :) & |
| 116 |
= spread(o3_mob_regr(1, jjm + 1, :), dim=1, ncopies=iim) |
| 117 |
|
| 118 |
! Duplicate first longitude to last longitude: |
| 119 |
o3_mob_regr(iim + 1, 2:jjm, :) = o3_mob_regr(1, 2:jjm, :) |
| 120 |
|
| 121 |
end subroutine regr_pr_o3 |
| 122 |
|
| 123 |
end module regr_pr_o3_m |
Parent Directory
| 
Revision Log