| 1 |
module regr_lat_time_coefoz_m |
| 2 |
|
| 3 |
! This module is clean: no C preprocessor directive, no include line. |
| 4 |
! Author: Lionel GUEZ |
| 5 |
|
| 6 |
implicit none |
| 7 |
|
| 8 |
private |
| 9 |
public regr_lat_time_coefoz |
| 10 |
|
| 11 |
contains |
| 12 |
|
| 13 |
subroutine regr_lat_time_coefoz |
| 14 |
|
| 15 |
! "regr_lat_time_coefoz" stands for "regrid latitude time |
| 16 |
! coefficients ozone". |
| 17 |
|
| 18 |
! This procedure reads from a NetCDF file parameters for ozone |
| 19 |
! chemistry, regrids them in latitude and time, and writes the |
| 20 |
! regridded fields to a new NetCDF file. |
| 21 |
|
| 22 |
! The input fields depend on time, pressure level and |
| 23 |
! latitude. |
| 24 |
! We assume that the input fields are step functions |
| 25 |
! of latitude. |
| 26 |
! Regridding in latitude is made by averaging, with a cosine of |
| 27 |
! latitude factor. |
| 28 |
! The target LMDZ latitude grid is the "scalar" grid: "rlatu". |
| 29 |
! The values of "rlatu" are taken to be the centers of intervals. |
| 30 |
! Regridding in time is by linear interpolation. |
| 31 |
! Monthly values are processed to get daily values, on the basis |
| 32 |
! of a 360-day calendar. |
| 33 |
|
| 34 |
! We assume that in the input file: |
| 35 |
! -- the latitude is in degrees and strictly monotonic (as all |
| 36 |
! NetCDF coordinate variables should be); |
| 37 |
! -- time increases from January to December (even though we do |
| 38 |
! not use values of the input time coordinate). |
| 39 |
|
| 40 |
use dimens_m, only: jjm |
| 41 |
use comgeom, only: rlatv |
| 42 |
use comconst, only: pi |
| 43 |
use regr1_step_av_m, only: regr1_step_av |
| 44 |
use regr3_lint_m, only: regr3_lint |
| 45 |
use netcdf95, only: nf95_open, nf95_gw_var, nf95_close, & |
| 46 |
nf95_inq_varid, handle_err, nf95_put_var |
| 47 |
use netcdf, only: nf90_nowrite, nf90_get_var |
| 48 |
|
| 49 |
! Variables local to the procedure: |
| 50 |
|
| 51 |
integer ncid_in, ncid_out ! NetCDF IDs for input and output files |
| 52 |
integer n_plev ! number of pressure levels in the input data |
| 53 |
integer n_lat! number of latitudes in the input data |
| 54 |
|
| 55 |
real, pointer:: latitude(:) |
| 56 |
! (of input data, converted to rad, sorted in strictly increasing order) |
| 57 |
|
| 58 |
real, allocatable:: lat_in_edg(:) |
| 59 |
! (edges of latitude intervals for input data, in rad, in strictly |
| 60 |
! increasing order) |
| 61 |
|
| 62 |
real, pointer:: plev(:) ! pressure level of input data |
| 63 |
logical decr_lat ! decreasing latitude in the input file |
| 64 |
|
| 65 |
real, allocatable:: o3_par_in(:, :, :) ! (n_lat, n_plev, 12) |
| 66 |
! (ozone parameter from the input file) |
| 67 |
! ("o3_par_in(j, l, month)" is at latitude "latitude(j)" and pressure |
| 68 |
! level "plev(l)". "month" is between 1 and 12.) |
| 69 |
|
| 70 |
real, allocatable:: v_regr_lat(:, :, :) ! (jjm + 1, n_plev, 0:13) |
| 71 |
! (mean of a variable "v" over a latitude interval) |
| 72 |
! (First dimension is latitude interval. |
| 73 |
! The latitude interval for "v_regr_lat(j,:, :)" contains "rlatu(j)". |
| 74 |
! If "j" is between 2 and "jjm" then the interval is: |
| 75 |
! [rlatv(j), rlatv(j-1)] |
| 76 |
! If "j" is 1 or "jjm + 1" then the interval is: |
| 77 |
! [rlatv(1), pi / 2] |
| 78 |
! or: |
| 79 |
! [- pi / 2, rlatv(jjm)] |
| 80 |
! respectively. |
| 81 |
! "v_regr_lat(:, l, :)" is for pressure level "plev(l)". |
| 82 |
! Last dimension is month number.) |
| 83 |
|
| 84 |
real, allocatable:: o3_par_out(:, :, :) ! (jjm + 1, n_plev, 360) |
| 85 |
! (regridded ozone parameter) |
| 86 |
! ("o3_par_out(j, l, day)" is at latitude "rlatu(j)", pressure |
| 87 |
! level "plev(l)" and date "January 1st 0h" + "tmidday(day)", in a |
| 88 |
! 360-day calendar.) |
| 89 |
|
| 90 |
integer j |
| 91 |
integer i_v ! index of ozone parameter |
| 92 |
integer, parameter:: n_o3_param = 8 ! number of ozone parameters |
| 93 |
|
| 94 |
character(len=11) name_in(n_o3_param) |
| 95 |
! (name of NetCDF primary variable in the input file) |
| 96 |
|
| 97 |
character(len=9) name_out(n_o3_param) |
| 98 |
! (name of NetCDF primary variable in the output file) |
| 99 |
|
| 100 |
integer varid_in(n_o3_param), varid_out(n_o3_param), varid_plev, varid_time |
| 101 |
integer ncerr, varid |
| 102 |
! (for NetCDF) |
| 103 |
|
| 104 |
real, parameter:: tmidmonth(0:13) = (/(-15. + 30. * j, j = 0, 13)/) |
| 105 |
! (time to middle of month, in days since January 1st 0h, in a |
| 106 |
! 360-day calendar) |
| 107 |
! (We add values -15 and 375 so that, for example, day 3 of the year is |
| 108 |
! interpolated between the December and the January value.) |
| 109 |
|
| 110 |
real, parameter:: tmidday(360) = (/(j + 0.5, j = 0, 359)/) |
| 111 |
! (time to middle of day, in days since January 1st 0h, in a |
| 112 |
! 360-day calendar) |
| 113 |
|
| 114 |
!--------------------------------- |
| 115 |
|
| 116 |
print *, "Call sequence information: regr_lat_time_coefoz" |
| 117 |
|
| 118 |
! Names of ozone parameters: |
| 119 |
i_v = 0 |
| 120 |
|
| 121 |
i_v = i_v + 1 |
| 122 |
name_in(i_v) = "P_net" |
| 123 |
name_out(i_v) = "P_net_Mob" |
| 124 |
|
| 125 |
i_v = i_v + 1 |
| 126 |
name_in(i_v) = "a2" |
| 127 |
name_out(i_v) = "a2" |
| 128 |
|
| 129 |
i_v = i_v + 1 |
| 130 |
name_in(i_v) = "tro3" |
| 131 |
name_out(i_v) = "r_Mob" |
| 132 |
|
| 133 |
i_v = i_v + 1 |
| 134 |
name_in(i_v) = "a4" |
| 135 |
name_out(i_v) = "a4" |
| 136 |
|
| 137 |
i_v = i_v + 1 |
| 138 |
name_in(i_v) = "temperature" |
| 139 |
name_out(i_v) = "temp_Mob" |
| 140 |
|
| 141 |
i_v = i_v + 1 |
| 142 |
name_in(i_v) = "a6" |
| 143 |
name_out(i_v) = "a6" |
| 144 |
|
| 145 |
i_v = i_v + 1 |
| 146 |
name_in(i_v) = "Sigma" |
| 147 |
name_out(i_v) = "Sigma_Mob" |
| 148 |
|
| 149 |
i_v = i_v + 1 |
| 150 |
name_in(i_v) = "R_Het" |
| 151 |
name_out(i_v) = "R_Het" |
| 152 |
|
| 153 |
call nf95_open("coefoz.nc", nf90_nowrite, ncid_in) |
| 154 |
|
| 155 |
! Get coordinates from the input file: |
| 156 |
|
| 157 |
call nf95_inq_varid(ncid_in, "latitude", varid) |
| 158 |
call nf95_gw_var(ncid_in, varid, latitude) |
| 159 |
! Convert from degrees to rad, because "rlatv" is in rad: |
| 160 |
latitude = latitude / 180. * pi |
| 161 |
n_lat = size(latitude) |
| 162 |
! We need to supply the latitudes to "regr1_step_av" in |
| 163 |
! increasing order, so invert order if necessary: |
| 164 |
decr_lat = latitude(1) > latitude(n_lat) |
| 165 |
if (decr_lat) latitude = latitude(n_lat:1:-1) |
| 166 |
|
| 167 |
! Compute edges of latitude intervals: |
| 168 |
allocate(lat_in_edg(n_lat + 1)) |
| 169 |
lat_in_edg(1) = - pi / 2 |
| 170 |
forall (j = 2:n_lat) lat_in_edg(j) = (latitude(j - 1) + latitude(j)) / 2 |
| 171 |
lat_in_edg(n_lat + 1) = pi / 2 |
| 172 |
deallocate(latitude) ! pointer |
| 173 |
|
| 174 |
call nf95_inq_varid(ncid_in, "plev", varid) |
| 175 |
call nf95_gw_var(ncid_in, varid, plev) |
| 176 |
n_plev = size(plev) |
| 177 |
! (We only need the pressure coordinate to copy it to the output file.) |
| 178 |
|
| 179 |
! Get the IDs of ozone parameters in the input file: |
| 180 |
do i_v = 1, n_o3_param |
| 181 |
call nf95_inq_varid(ncid_in, trim(name_in(i_v)), varid_in(i_v)) |
| 182 |
end do |
| 183 |
|
| 184 |
! Create the output file and get the variable IDs: |
| 185 |
call prepare_out(ncid_in, varid_in, n_plev, name_out, ncid_out, & |
| 186 |
varid_out, varid_plev, varid_time) |
| 187 |
|
| 188 |
! Write remaining coordinate variables: |
| 189 |
call nf95_put_var(ncid_out, varid_time, tmidday) |
| 190 |
call nf95_put_var(ncid_out, varid_plev, plev) |
| 191 |
|
| 192 |
deallocate(plev) ! pointer |
| 193 |
|
| 194 |
allocate(o3_par_in(n_lat, n_plev, 12)) |
| 195 |
allocate(v_regr_lat(jjm + 1, n_plev, 0:13)) |
| 196 |
allocate(o3_par_out(jjm + 1, n_plev, 360)) |
| 197 |
|
| 198 |
do i_v = 1, n_o3_param |
| 199 |
! Process ozone parameter "name_in(i_v)" |
| 200 |
|
| 201 |
ncerr = nf90_get_var(ncid_in, varid_in(i_v), o3_par_in) |
| 202 |
call handle_err("nf90_get_var", ncerr, ncid_in) |
| 203 |
|
| 204 |
if (decr_lat) o3_par_in = o3_par_in(n_lat:1:-1, :, :) |
| 205 |
|
| 206 |
! Regrid in latitude: |
| 207 |
! We average with respect to sine of latitude, which is |
| 208 |
! equivalent to weighting by cosine of latitude: |
| 209 |
v_regr_lat(jjm+1:1:-1, :, 1:12) = regr1_step_av(o3_par_in, & |
| 210 |
xs=sin(lat_in_edg), xt=sin((/- pi / 2, rlatv(jjm:1:-1), pi / 2/))) |
| 211 |
! (invert order of indices in "v_regr_lat" because "rlatu" is |
| 212 |
! decreasing) |
| 213 |
|
| 214 |
! Duplicate January and December values, in preparation of time |
| 215 |
! interpolation: |
| 216 |
v_regr_lat(:, :, 0) = v_regr_lat(:, :, 12) |
| 217 |
v_regr_lat(:, :, 13) = v_regr_lat(:, :, 1) |
| 218 |
|
| 219 |
! Regrid in time by linear interpolation: |
| 220 |
o3_par_out = regr3_lint(v_regr_lat, tmidmonth, tmidday) |
| 221 |
|
| 222 |
! Write to file: |
| 223 |
call nf95_put_var(ncid_out, varid_out(i_v), & |
| 224 |
o3_par_out(jjm+1:1:-1, :, :)) |
| 225 |
! (The order of "rlatu" is inverted in the output file) |
| 226 |
end do |
| 227 |
|
| 228 |
call nf95_close(ncid_out) |
| 229 |
call nf95_close(ncid_in) |
| 230 |
|
| 231 |
end subroutine regr_lat_time_coefoz |
| 232 |
|
| 233 |
!******************************************** |
| 234 |
|
| 235 |
subroutine prepare_out(ncid_in, varid_in, n_plev, name_out, ncid_out, & |
| 236 |
varid_out, varid_plev, varid_time) |
| 237 |
|
| 238 |
! This subroutine creates the NetCDF output file, defines |
| 239 |
! dimensions and variables, and writes one of the coordinate variables. |
| 240 |
|
| 241 |
use dimens_m, only: jjm |
| 242 |
use comgeom, only: rlatu |
| 243 |
use comconst, only: pi |
| 244 |
use nr_util, only: assert_eq |
| 245 |
|
| 246 |
use netcdf95, only: nf95_create, nf95_def_dim, nf95_def_var, & |
| 247 |
nf95_put_att, nf95_enddef, nf95_copy_att, nf95_put_var |
| 248 |
use netcdf, only: nf90_clobber, nf90_float, nf90_copy_att, nf90_global |
| 249 |
|
| 250 |
integer, intent(in):: ncid_in, varid_in(:), n_plev |
| 251 |
character(len=*), intent(in):: name_out(:) ! of NetCDF variables |
| 252 |
integer, intent(out):: ncid_out, varid_out(:), varid_plev, varid_time |
| 253 |
|
| 254 |
! Variables local to the procedure: |
| 255 |
integer ncerr |
| 256 |
integer dimid_rlatu, dimid_plev, dimid_time |
| 257 |
integer varid_rlatu |
| 258 |
integer i, n_o3_param |
| 259 |
|
| 260 |
!--------------------------- |
| 261 |
|
| 262 |
print *, "Call sequence information: prepare_out" |
| 263 |
n_o3_param = assert_eq(size(varid_in), size(varid_out), & |
| 264 |
size(name_out), "prepare_out") |
| 265 |
|
| 266 |
call nf95_create("coefoz_LMDZ.nc", nf90_clobber, ncid_out) |
| 267 |
|
| 268 |
! Dimensions: |
| 269 |
call nf95_def_dim(ncid_out, "time", 360, dimid_time) |
| 270 |
call nf95_def_dim(ncid_out, "plev", n_plev, dimid_plev) |
| 271 |
call nf95_def_dim(ncid_out, "rlatu", jjm + 1, dimid_rlatu) |
| 272 |
|
| 273 |
! Define coordinate variables: |
| 274 |
|
| 275 |
call nf95_def_var(ncid_out, "time", nf90_float, dimid_time, varid_time) |
| 276 |
call nf95_put_att(ncid_out, varid_time, "units", "days since 2000-1-1") |
| 277 |
call nf95_put_att(ncid_out, varid_time, "calendar", "360_day") |
| 278 |
call nf95_put_att(ncid_out, varid_time, "standard_name", "time") |
| 279 |
|
| 280 |
call nf95_def_var(ncid_out, "plev", nf90_float, dimid_plev, varid_plev) |
| 281 |
call nf95_put_att(ncid_out, varid_plev, "units", "millibar") |
| 282 |
call nf95_put_att(ncid_out, varid_plev, "standard_name", "air_pressure") |
| 283 |
call nf95_put_att(ncid_out, varid_plev, "long_name", "air pressure") |
| 284 |
|
| 285 |
call nf95_def_var(ncid_out, "rlatu", nf90_float, dimid_rlatu, varid_rlatu) |
| 286 |
call nf95_put_att(ncid_out, varid_rlatu, "units", "degrees_north") |
| 287 |
call nf95_put_att(ncid_out, varid_rlatu, "standard_name", "latitude") |
| 288 |
|
| 289 |
! Define primary variables: |
| 290 |
|
| 291 |
do i = 1, n_o3_param |
| 292 |
call nf95_def_var(ncid_out, name_out(i), nf90_float, & |
| 293 |
(/dimid_rlatu, dimid_plev, dimid_time/), varid_out(i)) |
| 294 |
|
| 295 |
! The following commands may fail. That is OK. It should just |
| 296 |
! mean that the attribute is not defined in the input file. |
| 297 |
|
| 298 |
ncerr = nf90_copy_att(ncid_in, varid_in(i), "long_name",& |
| 299 |
& ncid_out, varid_out(i)) |
| 300 |
call handle_err_copy_att("long_name") |
| 301 |
|
| 302 |
ncerr = nf90_copy_att(ncid_in, varid_in(i), "units", ncid_out,& |
| 303 |
& varid_out(i)) |
| 304 |
call handle_err_copy_att("units") |
| 305 |
|
| 306 |
ncerr = nf90_copy_att(ncid_in, varid_in(i), "standard_name", ncid_out,& |
| 307 |
& varid_out(i)) |
| 308 |
call handle_err_copy_att("standard_name") |
| 309 |
end do |
| 310 |
|
| 311 |
! Global attributes: |
| 312 |
call nf95_copy_att(ncid_in, nf90_global, "Conventions", ncid_out, & |
| 313 |
nf90_global) |
| 314 |
call nf95_copy_att(ncid_in, nf90_global, "title", ncid_out, nf90_global) |
| 315 |
call nf95_copy_att(ncid_in, nf90_global, "source", ncid_out, nf90_global) |
| 316 |
call nf95_put_att(ncid_out, nf90_global, "comment", "Regridded for LMDZ") |
| 317 |
|
| 318 |
call nf95_enddef(ncid_out) |
| 319 |
|
| 320 |
! Write one of the coordinate variables: |
| 321 |
call nf95_put_var(ncid_out, varid_rlatu, rlatu(jjm+1:1:-1) / pi * 180.) |
| 322 |
! (convert from rad to degrees and sort in increasing order) |
| 323 |
|
| 324 |
contains |
| 325 |
|
| 326 |
subroutine handle_err_copy_att(att_name) |
| 327 |
|
| 328 |
use netcdf, only: nf90_noerr, nf90_strerror |
| 329 |
|
| 330 |
character(len=*), intent(in):: att_name |
| 331 |
|
| 332 |
!---------------------------------------- |
| 333 |
|
| 334 |
if (ncerr /= nf90_noerr) then |
| 335 |
print *, "prepare_out " // trim(name_out(i)) & |
| 336 |
// " nf90_copy_att " // att_name // " -- " & |
| 337 |
// trim(nf90_strerror(ncerr)) |
| 338 |
end if |
| 339 |
|
| 340 |
end subroutine handle_err_copy_att |
| 341 |
|
| 342 |
end subroutine prepare_out |
| 343 |
|
| 344 |
end module regr_lat_time_coefoz_m |
Parent Directory
| 
Revision Log