1 |
guez |
90 |
module regr_pr_int_m |
2 |
|
|
|
3 |
guez |
168 |
! Author: Lionel GUEZ |
4 |
|
|
|
5 |
guez |
90 |
implicit none |
6 |
|
|
|
7 |
|
|
contains |
8 |
|
|
|
9 |
guez |
162 |
subroutine regr_pr_int(ncid, name, julien, pplay, top_value, v3) |
10 |
guez |
90 |
|
11 |
|
|
! "regr_pr_int" stands for "regrid pressure interpolation". |
12 |
|
|
|
13 |
|
|
! This procedure reads a 2D latitude-pressure field from a NetCDF |
14 |
|
|
! file, at a given day, regrids the field in pressure to the LMDZ |
15 |
|
|
! vertical grid and packs it to the LMDZ horizontal "physics" |
16 |
|
|
! grid. We assume that, in the input file, the field has 3 |
17 |
|
|
! dimensions: latitude, pressure, julian day. We assume that |
18 |
|
|
! latitudes are in ascending order in the input file. We assume |
19 |
|
|
! that the input data is already on the LMDZ "rlatu" latitude |
20 |
|
|
! grid. |
21 |
|
|
|
22 |
guez |
173 |
! The target vertical LMDZ grid is the grid of mid-layers. The |
23 |
|
|
! input data does not depend on longitude, but the pressure at |
24 |
|
|
! LMDZ mid-layers does. Therefore, the values on the LMDZ grid do |
25 |
|
|
! depend on longitude. Regridding is by linear interpolation. |
26 |
guez |
90 |
|
27 |
|
|
use dimens_m, only: iim, jjm, llm |
28 |
|
|
use dimphy, only: klon |
29 |
guez |
168 |
use grid_change, only: gr_dyn_phy |
30 |
guez |
90 |
use netcdf95, only: nf95_inq_varid, nf95_get_var |
31 |
|
|
use nr_util, only: assert |
32 |
|
|
use numer_rec_95, only: regr1_lint |
33 |
|
|
use press_coefoz_m, only: plev |
34 |
|
|
|
35 |
|
|
integer, intent(in):: ncid ! NetCDF ID of the file |
36 |
|
|
character(len=*), intent(in):: name ! of the NetCDF variable |
37 |
|
|
integer, intent(in):: julien ! jour julien, 1 <= julien <= 360 |
38 |
|
|
|
39 |
guez |
162 |
real, intent(in):: pplay(:, :) ! (klon, llm) |
40 |
|
|
! (pression pour le mileu de chaque couche, en Pa) |
41 |
|
|
|
42 |
guez |
90 |
real, intent(in):: top_value |
43 |
|
|
! (extra value of field at 0 pressure) |
44 |
|
|
|
45 |
|
|
real, intent(out):: v3(:, :) ! (klon, llm) |
46 |
|
|
! Regridded field on the partial "physics" grid. "v3(i, k)" is at |
47 |
|
|
! longitude "xlon(i)", latitude "xlat(i)", middle of layer "k". |
48 |
|
|
|
49 |
|
|
! Variables local to the procedure: |
50 |
|
|
|
51 |
guez |
105 |
integer varid ! for NetCDF |
52 |
guez |
90 |
|
53 |
guez |
162 |
real v1(jjm + 1, 0:size(plev)) |
54 |
guez |
90 |
! Input field at day "julien". "v1(j, k >=1)" is at latitude |
55 |
|
|
! "rlatu(j)" and pressure "plev(k)". |
56 |
|
|
|
57 |
guez |
162 |
real v2(klon, 0:size(plev)) |
58 |
|
|
! Field on the "physics" horizontal grid. "v2(i, k >= 1)" is at |
59 |
|
|
! longitude "xlon(i)", latitude "xlat(i)" and pressure "plev(k)".) |
60 |
guez |
90 |
|
61 |
guez |
168 |
integer i |
62 |
guez |
90 |
|
63 |
|
|
!-------------------------------------------- |
64 |
|
|
|
65 |
|
|
call assert(shape(v3) == (/klon, llm/), "regr_pr_int") |
66 |
|
|
|
67 |
|
|
call nf95_inq_varid(ncid, name, varid) |
68 |
|
|
|
69 |
|
|
! Get data at the right day from the input file: |
70 |
|
|
call nf95_get_var(ncid, varid, v1(:, 1:), start=(/1, 1, julien/)) |
71 |
|
|
! Latitudes are in ascending order in the input file while |
72 |
|
|
! "rlatu" is in descending order so we need to invert order: |
73 |
|
|
v1(:, 1:) = v1(jjm+1:1:-1, 1:) |
74 |
|
|
|
75 |
|
|
! Complete "v1" with the value at 0 pressure: |
76 |
|
|
v1(:, 0) = top_value |
77 |
|
|
|
78 |
guez |
168 |
v2 = gr_dyn_phy(spread(v1, dim = 1, ncopies = iim + 1)) |
79 |
guez |
162 |
|
80 |
guez |
90 |
! Regrid in pressure at each horizontal position: |
81 |
guez |
162 |
do i = 1, klon |
82 |
|
|
v3(i, llm:1:-1) = regr1_lint(v2(i, :), (/0., plev/), pplay(i, llm:1:-1)) |
83 |
|
|
! (invert order of indices because "pplay" is in descending order) |
84 |
guez |
90 |
end do |
85 |
|
|
|
86 |
|
|
end subroutine regr_pr_int |
87 |
|
|
|
88 |
|
|
end module regr_pr_int_m |