1 |
guez |
90 |
module regr_pr_av_m |
2 |
guez |
3 |
|
3 |
|
|
implicit none |
4 |
|
|
|
5 |
|
|
contains |
6 |
|
|
|
7 |
guez |
162 |
subroutine regr_pr_av(ncid, name, julien, paprs, v3) |
8 |
guez |
3 |
|
9 |
guez |
90 |
! "regr_pr_av" stands for "regrid pressure averaging". |
10 |
|
|
|
11 |
|
|
! This procedure reads a 2D latitude-pressure field from a NetCDF |
12 |
|
|
! file, at a given day, regrids this field in pressure to the LMDZ |
13 |
|
|
! vertical grid and packs it to the LMDZ horizontal "physics" |
14 |
|
|
! grid. |
15 |
|
|
|
16 |
|
|
! We assume that, in the input file, the field has 3 dimensions: |
17 |
|
|
! latitude, pressure, julian day. |
18 |
|
|
|
19 |
|
|
! We assume that the input field is already on the LMDZ "rlatu" |
20 |
|
|
! latitudes, except that latitudes are in ascending order in the |
21 |
|
|
! input file. |
22 |
|
|
|
23 |
guez |
19 |
! The target vertical LMDZ grid is the grid of layer boundaries. |
24 |
guez |
20 |
! Regridding in pressure is done by averaging a step function of pressure. |
25 |
guez |
3 |
|
26 |
|
|
use dimens_m, only: iim, jjm, llm |
27 |
|
|
use dimphy, only: klon |
28 |
guez |
52 |
use grid_change, only: dyn_phy |
29 |
guez |
90 |
use netcdf95, only: nf95_inq_varid, nf95_get_var |
30 |
guez |
36 |
use nr_util, only: assert |
31 |
guez |
61 |
use numer_rec_95, only: regr1_step_av |
32 |
guez |
17 |
use press_coefoz_m, only: press_in_edg |
33 |
guez |
3 |
|
34 |
|
|
integer, intent(in):: ncid ! NetCDF ID of the file |
35 |
|
|
character(len=*), intent(in):: name ! of the NetCDF variable |
36 |
guez |
7 |
integer, intent(in):: julien ! jour julien, 1 <= julien <= 360 |
37 |
guez |
3 |
|
38 |
guez |
162 |
real, intent(in):: paprs(:, :) ! (klon, llm + 1) |
39 |
|
|
! (pression pour chaque inter-couche, en Pa) |
40 |
|
|
|
41 |
guez |
7 |
real, intent(out):: v3(:, :) ! (klon, llm) |
42 |
guez |
90 |
! regridded field on the partial "physics" grid |
43 |
|
|
! "v3(i, k)" is at longitude "xlon(i)", latitude "xlat(i)", in |
44 |
|
|
! layer "k". |
45 |
guez |
7 |
|
46 |
|
|
! Variables local to the procedure: |
47 |
|
|
|
48 |
guez |
105 |
integer varid ! for NetCDF |
49 |
guez |
20 |
|
50 |
guez |
162 |
real v1(jjm + 1, size(press_in_edg) - 1) |
51 |
guez |
90 |
! input field at day "julien" |
52 |
|
|
! "v1(j, k)" is at latitude "rlatu(j)" and for |
53 |
|
|
! pressure interval "[press_in_edg(k), press_in_edg(k+1)]". |
54 |
guez |
7 |
|
55 |
guez |
162 |
real v2(klon, size(press_in_edg) - 1) |
56 |
|
|
! Field on the "physics" horizontal grid. "v2(i, k)" is at |
57 |
|
|
! longitude "xlon(i)", latitude "xlat(i)" and for pressure |
58 |
|
|
! interval "[press_in_edg(k), press_in_edg(k+1)]".) |
59 |
guez |
7 |
|
60 |
guez |
162 |
integer i, k |
61 |
guez |
20 |
|
62 |
guez |
7 |
!-------------------------------------------- |
63 |
|
|
|
64 |
guez |
162 |
call assert(shape(v3) == (/klon, llm/), "regr_pr_av klon llm") |
65 |
|
|
call assert(shape(paprs) == (/klon, llm+1/), "regr_pr_av paprs") |
66 |
guez |
7 |
|
67 |
|
|
call nf95_inq_varid(ncid, name, varid) |
68 |
|
|
|
69 |
|
|
! Get data at the right day from the input file: |
70 |
guez |
90 |
call nf95_get_var(ncid, varid, v1, start=(/1, 1, julien/)) |
71 |
guez |
20 |
! Latitudes are in ascending order in the input file while |
72 |
|
|
! "rlatu" is in descending order so we need to invert order: |
73 |
guez |
7 |
v1 = v1(jjm+1:1:-1, :) |
74 |
|
|
|
75 |
guez |
162 |
forall (k = 1:size(press_in_edg) - 1) v2(:, k) = pack(spread(v1(:, k), & |
76 |
|
|
dim = 1, ncopies = iim + 1), dyn_phy) |
77 |
|
|
|
78 |
guez |
7 |
! Regrid in pressure at each horizontal position: |
79 |
guez |
162 |
do i = 1, klon |
80 |
|
|
v3(i, llm:1:-1) = regr1_step_av(v2(i, :), press_in_edg, & |
81 |
|
|
paprs(i, llm+1:1:-1)) |
82 |
|
|
! (invert order of indices because "paprs" is in descending order) |
83 |
guez |
19 |
end do |
84 |
guez |
7 |
|
85 |
guez |
90 |
end subroutine regr_pr_av |
86 |
guez |
7 |
|
87 |
guez |
90 |
end module regr_pr_av_m |