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module regr_lat_time_coefoz_m |
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|
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! Author: Lionel GUEZ |
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|
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implicit none |
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|
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private |
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public regr_lat_time_coefoz |
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|
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contains |
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|
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subroutine regr_lat_time_coefoz |
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|
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! "regr_lat_time_coefoz" stands for "regrid latitude time |
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! coefficients ozone". |
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|
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! This procedure reads from a NetCDF file parameters for ozone |
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! chemistry, regrids them in latitude and time, and writes the |
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! regridded fields to a new NetCDF file. |
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|
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! The input fields depend on time, pressure level and |
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! latitude. |
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! We assume that the input fields are step functions |
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! of latitude. |
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! Regridding in latitude is made by averaging, with a cosine of |
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! latitude factor. |
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! The target LMDZ latitude grid is the "scalar" grid: "rlatu". |
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! The values of "rlatu" are taken to be the centers of intervals. |
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! Regridding in time is by linear interpolation. |
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! Monthly values are processed to get daily values, on the basis |
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! of a 360-day calendar. |
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|
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! We assume that in the input file: |
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! -- the latitude is in degrees and strictly monotonic (as all |
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! NetCDF coordinate variables should be); |
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! -- time increases from January to December (even though we do |
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! not use values of the input time coordinate). |
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|
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use dimens_m, only: jjm |
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use comgeom, only: rlatv |
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use nr_util, only: pi |
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use numer_rec_95, only: regr1_step_av, regr3_lint |
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use netcdf95, only: nf95_open, nf95_gw_var, nf95_close, & |
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nf95_inq_varid, handle_err, nf95_put_var |
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use netcdf, only: nf90_nowrite, nf90_get_var |
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|
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! Variables local to the procedure: |
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|
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integer ncid_in, ncid_out ! NetCDF IDs for input and output files |
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integer n_plev ! number of pressure levels in the input data |
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integer n_lat! number of latitudes in the input data |
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|
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real, pointer:: latitude(:) |
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! (of input data, converted to rad, sorted in strictly increasing order) |
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|
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real, allocatable:: lat_in_edg(:) |
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! (edges of latitude intervals for input data, in rad, in strictly |
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! increasing order) |
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|
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real, pointer:: plev(:) ! pressure level of input data |
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logical decr_lat ! decreasing latitude in the input file |
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|
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real, allocatable:: o3_par_in(:, :, :) ! (n_lat, n_plev, 12) |
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! (ozone parameter from the input file) |
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! ("o3_par_in(j, l, month)" is at latitude "latitude(j)" and pressure |
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! level "plev(l)". "month" is between 1 and 12.) |
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|
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real, allocatable:: v_regr_lat(:, :, :) ! (jjm + 1, n_plev, 0:13) |
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! (mean of a variable "v" over a latitude interval) |
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! (First dimension is latitude interval. |
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! The latitude interval for "v_regr_lat(j,:, :)" contains "rlatu(j)". |
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! If "j" is between 2 and "jjm" then the interval is: |
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! [rlatv(j), rlatv(j-1)] |
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! If "j" is 1 or "jjm + 1" then the interval is: |
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! [rlatv(1), pi / 2] |
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! or: |
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! [- pi / 2, rlatv(jjm)] |
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! respectively. |
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! "v_regr_lat(:, l, :)" is for pressure level "plev(l)". |
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! Last dimension is month number.) |
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|
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real, allocatable:: o3_par_out(:, :, :) ! (jjm + 1, n_plev, 360) |
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! (regridded ozone parameter) |
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! ("o3_par_out(j, l, day)" is at latitude "rlatu(j)", pressure |
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! level "plev(l)" and date "January 1st 0h" + "tmidday(day)", in a |
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! 360-day calendar.) |
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|
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integer j |
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integer i_v ! index of ozone parameter |
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integer, parameter:: n_o3_param = 8 ! number of ozone parameters |
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|
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character(len=11) name_in(n_o3_param) |
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! (name of NetCDF primary variable in the input file) |
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|
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character(len=9) name_out(n_o3_param) |
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! (name of NetCDF primary variable in the output file) |
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|
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integer varid_in(n_o3_param), varid_out(n_o3_param), varid_plev, varid_time |
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integer ncerr, varid |
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! (for NetCDF) |
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|
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real, parameter:: tmidmonth(0:13) = (/(-15. + 30. * j, j = 0, 13)/) |
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! (time to middle of month, in days since January 1st 0h, in a |
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! 360-day calendar) |
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! (We add values -15 and 375 so that, for example, day 3 of the year is |
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! interpolated between the December and the January value.) |
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|
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real, parameter:: tmidday(360) = (/(j + 0.5, j = 0, 359)/) |
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! (time to middle of day, in days since January 1st 0h, in a |
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! 360-day calendar) |
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|
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!--------------------------------- |
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|
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print *, "Call sequence information: regr_lat_time_coefoz" |
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|
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! Names of ozone parameters: |
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i_v = 0 |
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|
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i_v = i_v + 1 |
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name_in(i_v) = "P_net" |
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name_out(i_v) = "P_net_Mob" |
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|
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i_v = i_v + 1 |
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name_in(i_v) = "a2" |
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name_out(i_v) = "a2" |
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|
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i_v = i_v + 1 |
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name_in(i_v) = "tro3" |
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name_out(i_v) = "r_Mob" |
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|
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i_v = i_v + 1 |
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name_in(i_v) = "a4" |
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name_out(i_v) = "a4" |
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|
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i_v = i_v + 1 |
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name_in(i_v) = "temperature" |
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name_out(i_v) = "temp_Mob" |
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i_v = i_v + 1 |
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name_in(i_v) = "a6" |
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name_out(i_v) = "a6" |
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|
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i_v = i_v + 1 |
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name_in(i_v) = "Sigma" |
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name_out(i_v) = "Sigma_Mob" |
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|
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i_v = i_v + 1 |
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name_in(i_v) = "R_Het" |
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name_out(i_v) = "R_Het" |
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|
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call nf95_open("coefoz.nc", nf90_nowrite, ncid_in) |
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|
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! Get coordinates from the input file: |
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|
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call nf95_inq_varid(ncid_in, "latitude", varid) |
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call nf95_gw_var(ncid_in, varid, latitude) |
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! Convert from degrees to rad, because "rlatv" is in rad: |
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latitude = latitude / 180. * pi |
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n_lat = size(latitude) |
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! We need to supply the latitudes to "regr1_step_av" in |
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! increasing order, so invert order if necessary: |
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decr_lat = latitude(1) > latitude(n_lat) |
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if (decr_lat) latitude = latitude(n_lat:1:-1) |
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|
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! Compute edges of latitude intervals: |
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allocate(lat_in_edg(n_lat + 1)) |
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lat_in_edg(1) = - pi / 2 |
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forall (j = 2:n_lat) lat_in_edg(j) = (latitude(j - 1) + latitude(j)) / 2 |
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lat_in_edg(n_lat + 1) = pi / 2 |
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deallocate(latitude) ! pointer |
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|
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call nf95_inq_varid(ncid_in, "plev", varid) |
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call nf95_gw_var(ncid_in, varid, plev) |
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n_plev = size(plev) |
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! (We only need the pressure coordinate to copy it to the output file.) |
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|
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! Get the IDs of ozone parameters in the input file: |
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do i_v = 1, n_o3_param |
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call nf95_inq_varid(ncid_in, trim(name_in(i_v)), varid_in(i_v)) |
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end do |
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|
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! Create the output file and get the variable IDs: |
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call prepare_out(ncid_in, varid_in, n_plev, name_out, ncid_out, & |
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varid_out, varid_plev, varid_time) |
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|
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! Write remaining coordinate variables: |
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call nf95_put_var(ncid_out, varid_time, tmidday) |
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call nf95_put_var(ncid_out, varid_plev, plev) |
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|
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deallocate(plev) ! pointer |
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|
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allocate(o3_par_in(n_lat, n_plev, 12)) |
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allocate(v_regr_lat(jjm + 1, n_plev, 0:13)) |
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allocate(o3_par_out(jjm + 1, n_plev, 360)) |
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|
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do i_v = 1, n_o3_param |
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! Process ozone parameter "name_in(i_v)" |
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|
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ncerr = nf90_get_var(ncid_in, varid_in(i_v), o3_par_in) |
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call handle_err("nf90_get_var", ncerr, ncid_in) |
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|
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if (decr_lat) o3_par_in = o3_par_in(n_lat:1:-1, :, :) |
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|
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! Regrid in latitude: |
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! We average with respect to sine of latitude, which is |
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! equivalent to weighting by cosine of latitude: |
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v_regr_lat(jjm+1:1:-1, :, 1:12) = regr1_step_av(o3_par_in, & |
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xs=sin(lat_in_edg), xt=sin((/- pi / 2, rlatv(jjm:1:-1), pi / 2/))) |
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! (invert order of indices in "v_regr_lat" because "rlatu" is |
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! decreasing) |
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|
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! Duplicate January and December values, in preparation of time |
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! interpolation: |
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v_regr_lat(:, :, 0) = v_regr_lat(:, :, 12) |
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v_regr_lat(:, :, 13) = v_regr_lat(:, :, 1) |
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|
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! Regrid in time by linear interpolation: |
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o3_par_out = regr3_lint(v_regr_lat, tmidmonth, tmidday) |
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|
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! Write to file: |
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call nf95_put_var(ncid_out, varid_out(i_v), & |
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o3_par_out(jjm+1:1:-1, :, :)) |
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! (The order of "rlatu" is inverted in the output file) |
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end do |
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|
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call nf95_close(ncid_out) |
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call nf95_close(ncid_in) |
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|
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end subroutine regr_lat_time_coefoz |
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|
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!******************************************** |
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|
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subroutine prepare_out(ncid_in, varid_in, n_plev, name_out, ncid_out, & |
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varid_out, varid_plev, varid_time) |
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|
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! This subroutine creates the NetCDF output file, defines |
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! dimensions and variables, and writes one of the coordinate variables. |
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|
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use dimens_m, only: jjm |
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use comgeom, only: rlatu |
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use nr_util, only: assert_eq, pi |
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|
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use netcdf95, only: nf95_create, nf95_def_dim, nf95_def_var, & |
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nf95_put_att, nf95_enddef, nf95_copy_att, nf95_put_var |
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use netcdf, only: nf90_clobber, nf90_float, nf90_copy_att, nf90_global |
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|
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integer, intent(in):: ncid_in, varid_in(:), n_plev |
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character(len=*), intent(in):: name_out(:) ! of NetCDF variables |
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integer, intent(out):: ncid_out, varid_out(:), varid_plev, varid_time |
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|
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! Variables local to the procedure: |
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integer ncerr |
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integer dimid_rlatu, dimid_plev, dimid_time |
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integer varid_rlatu |
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integer i, n_o3_param |
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|
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!--------------------------- |
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|
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print *, "Call sequence information: prepare_out" |
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n_o3_param = assert_eq(size(varid_in), size(varid_out), & |
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size(name_out), "prepare_out") |
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|
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call nf95_create("coefoz_LMDZ.nc", nf90_clobber, ncid_out) |
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|
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! Dimensions: |
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call nf95_def_dim(ncid_out, "time", 360, dimid_time) |
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call nf95_def_dim(ncid_out, "plev", n_plev, dimid_plev) |
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call nf95_def_dim(ncid_out, "rlatu", jjm + 1, dimid_rlatu) |
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|
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! Define coordinate variables: |
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|
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call nf95_def_var(ncid_out, "time", nf90_float, dimid_time, varid_time) |
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call nf95_put_att(ncid_out, varid_time, "units", "days since 2000-1-1") |
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call nf95_put_att(ncid_out, varid_time, "calendar", "360_day") |
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call nf95_put_att(ncid_out, varid_time, "standard_name", "time") |
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|
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call nf95_def_var(ncid_out, "plev", nf90_float, dimid_plev, varid_plev) |
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call nf95_put_att(ncid_out, varid_plev, "units", "millibar") |
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call nf95_put_att(ncid_out, varid_plev, "standard_name", "air_pressure") |
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call nf95_put_att(ncid_out, varid_plev, "long_name", "air pressure") |
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|
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call nf95_def_var(ncid_out, "rlatu", nf90_float, dimid_rlatu, varid_rlatu) |
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call nf95_put_att(ncid_out, varid_rlatu, "units", "degrees_north") |
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call nf95_put_att(ncid_out, varid_rlatu, "standard_name", "latitude") |
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|
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! Define primary variables: |
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|
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do i = 1, n_o3_param |
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call nf95_def_var(ncid_out, name_out(i), nf90_float, & |
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(/dimid_rlatu, dimid_plev, dimid_time/), varid_out(i)) |
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|
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! The following commands may fail. That is OK. It should just |
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! mean that the attribute is not defined in the input file. |
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|
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ncerr = nf90_copy_att(ncid_in, varid_in(i), "long_name",& |
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& ncid_out, varid_out(i)) |
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call handle_err_copy_att("long_name") |
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|
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ncerr = nf90_copy_att(ncid_in, varid_in(i), "units", ncid_out,& |
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& varid_out(i)) |
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call handle_err_copy_att("units") |
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|
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ncerr = nf90_copy_att(ncid_in, varid_in(i), "standard_name", ncid_out,& |
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& varid_out(i)) |
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call handle_err_copy_att("standard_name") |
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end do |
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|
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! Global attributes: |
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call nf95_copy_att(ncid_in, nf90_global, "Conventions", ncid_out, & |
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nf90_global) |
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call nf95_copy_att(ncid_in, nf90_global, "title", ncid_out, nf90_global) |
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call nf95_copy_att(ncid_in, nf90_global, "source", ncid_out, nf90_global) |
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call nf95_put_att(ncid_out, nf90_global, "comment", "Regridded for LMDZ") |
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|
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call nf95_enddef(ncid_out) |
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|
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! Write one of the coordinate variables: |
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call nf95_put_var(ncid_out, varid_rlatu, rlatu(jjm+1:1:-1) / pi * 180.) |
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! (convert from rad to degrees and sort in increasing order) |
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|
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contains |
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|
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subroutine handle_err_copy_att(att_name) |
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|
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use netcdf, only: nf90_noerr, nf90_strerror |
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|
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character(len=*), intent(in):: att_name |
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|
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!---------------------------------------- |
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|
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if (ncerr /= nf90_noerr) then |
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print *, "prepare_out " // trim(name_out(i)) & |
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// " nf90_copy_att " // att_name // " -- " & |
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// trim(nf90_strerror(ncerr)) |
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end if |
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|
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end subroutine handle_err_copy_att |
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|
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end subroutine prepare_out |
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|
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end module regr_lat_time_coefoz_m |
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