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guez |
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module regr_coefoz_m |
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! This module is clean: no C preprocessor directive, no include line. |
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implicit none |
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private |
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public regr_coefoz |
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contains |
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subroutine regr_coefoz |
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! "regr_coefoz" stands for "regrid coefficients ozone". |
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! This procedure reads from a file parameters for ozone |
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! chemistry and regrids them for LMDZ. |
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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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! Horizontal regridding is made by averaging on latitude, with a |
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! cosine of latitude factor. |
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! The target horizontal LMDZ grid is the "scalar" grid: "rlonv", "rlatu". |
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! The values of "rlatu" are taken to be the centers of intervals. |
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! The target vertical LMDZ grid is the grid of mid-layers. |
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! The input latitude values are different from the latitude values |
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! of the LMDZ "scalar" grid. |
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! The input data does not depend on longitude, but the pressure |
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! at LMDZ mid-layers does. |
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! Therefore, the values on the LMDZ grid do depend on longitude. |
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! The regridded fields are written to a file. |
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! We assume that in the input file the latitude is in degrees |
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! and the pressure level is in hPa, and that both are strictly |
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! monotonic. |
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use dimens_m, only: iim, jjm, llm |
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use comgeom, only: rlatv |
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use comconst, only: pi |
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use pressure_m, only: p3d, pls |
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use regr1_step_av_m, only: regr1_step_av |
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use regr1_lint_m, only: regr1_lint |
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use netcdf95, only: nf95_open, nf90_nowrite, coordin, nf95_close, & |
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nf95_inq_varid, handle_err, nf90_put_var, nf90_get_var |
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! Variables local to the procedure: |
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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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real, pointer:: latitude(:) |
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! (of input data, converted to rad, sorted in strictly increasing order) |
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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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real, pointer:: plev(:) |
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! (pressure level of input data, converted to Pa, sorted |
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! in strictly increasing order) |
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real, allocatable:: press_in_edg(:) |
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! (edges of pressure intervals for input data, in Pa, in strictly |
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! increasing order) |
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logical decr_lat ! decreasing latitude in the input file |
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logical decr_plev ! decreasing pressure level in the input file |
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real, allocatable:: o3_par_in(:, :, :) |
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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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real o3_par_out(iim + 1, jjm + 1, llm, 12) |
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! (ozone parameter adapted to the LMDZ grid) |
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! (Last dimension is month number. |
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! "o3_par_out(i, j, l, month)" is at longitude "rlonv(i)", latitude |
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! "rlatu(j)" and pressure level "pls(i, j, l)") |
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integer i, 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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character(len=11) name_in(n_o3_param) |
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character(len=9) name_out(n_o3_param) |
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logical:: stepav_choice(n_o3_param) = .true. |
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! (vertical regridding by step avergage, otherwise linear interpolation) |
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real top_value(n_o3_param) |
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! (value at 0 pressure, only used for linear interpolation) |
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integer varid_in(n_o3_param), varid_out(n_o3_param), ncerr ! for NetCDF |
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real, allocatable:: v_regr_lat(:, :, :) |
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! (mean of "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 interval |
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! "[press_in_edg(l), press_in_edg(l+1)]" or pressure level "plev(l)", |
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! depending on the type of vertical regridding, step average or linear |
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! interpolation. |
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! Last dimension is month number.) |
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!--------------------------------- |
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print *, "Call sequence information: regr_coefoz" |
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! Details for each ozone parameter: |
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i_v = 0 |
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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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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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i_v = i_v + 1 |
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name_in(i_v) = "r" |
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name_out(i_v) = "r_Mob" |
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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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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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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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stepav_choice(i_v) = .false. |
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top_value(i_v) = 0. |
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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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call nf95_open("coefoz_v2_3.nc", nf90_nowrite, ncid_in) |
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! Get coordinates from the input file: |
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latitude => coordin(ncid_in, "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 "stepav" 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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! 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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plev => coordin(ncid_in, "plev") |
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! Convert from hPa to Pa because "p3d" is in Pa: |
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plev(:) = plev(:) * 100. |
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n_plev = size(plev) |
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! We need to supply the pressure levels to "stepav" in |
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! increasing order, so invert order if necessary: |
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decr_plev = plev(1) > plev(n_plev) |
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if (decr_plev) plev(:) = plev(n_plev:1:-1) |
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! Compute edges of pressure intervals: |
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allocate(press_in_edg(n_plev + 1)) |
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press_in_edg(1) = 0. |
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! We choose edges halfway in logarithm: |
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forall (j = 2:n_plev) press_in_edg(j) = sqrt(plev(j - 1) * plev(j)) |
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press_in_edg(n_plev + 1) = huge(0.) |
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! (infinity, but any value guaranteed to be greater than the |
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! surface pressure would do) |
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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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call prepare_out(ncid_in, varid_in, name_out, ncid_out, varid_out) |
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allocate(o3_par_in(n_lat, n_plev, 12), v_regr_lat(jjm + 1, 0:n_plev, 12)) |
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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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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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if (decr_lat) o3_par_in = o3_par_in(n_lat:1:-1, :, :) |
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if (decr_plev) o3_par_in = o3_par_in(:, n_plev:1:-1, :) |
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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:, :) = 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 because "rlatu" is decreasing) |
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! Regrid in pressure at each horizontal position: |
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if (stepav_choice(i_v)) then |
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! Regrid in pressure by averaging a step function of pressure |
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! Poles ("p3d" does not depend on longitude): |
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do j = 1, jjm + 1, jjm |
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! Average on pressure, only for first longitude: |
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o3_par_out(1, j, llm:1:-1, :) & |
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= regr1_step_av(v_regr_lat(j, 1:, :), press_in_edg, & |
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p3d(1, j, llm+1:1:-1)) |
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! (invert order of indices because "p3d" is decreasing) |
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end do |
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! Latitudes other than poles ("p3d" depends on longitude): |
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do j = 2, jjm |
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! Average on pressure at each longitude: |
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do i = 1, iim |
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o3_par_out(i, j, llm:1:-1, :) & |
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= regr1_step_av(v_regr_lat(j, 1:, :), press_in_edg, & |
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p3d(i, j, llm+1:1:-1)) |
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! (invert order of indices because "p3d" is decreasing) |
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end do |
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end do |
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else |
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! Regrid in pressure by linear interpolation |
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! Complete "v_regr_lat" with the value at 0 pressure: |
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v_regr_lat(:, 0, :) = top_value(i_v) |
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! Poles ("pls" does not depend on longitude): |
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do j = 1, jjm + 1, jjm |
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! Interpolate in pressure, only for first longitude: |
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o3_par_out(1, j, llm:1:-1, :) = regr1_lint(v_regr_lat(j, :, :), & |
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xs=(/0., plev/), xt=pls(1, j, llm:1:-1)) |
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! (invert order of indices because "pls" is decreasing) |
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end do |
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! Latitudes other than poles ("pls" depends on longitude): |
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do j = 2, jjm |
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! Average on pressure at each longitude: |
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do i = 1, iim |
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o3_par_out(i, j, llm:1:-1, :) & |
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= regr1_lint(v_regr_lat(j, :, :), xs=(/0., plev/), & |
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xt=pls(i, j, llm:1:-1)) |
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! (invert order of indices because "pls" is decreasing) |
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end do |
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end do |
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end if |
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| 268 |
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! Duplicate pole values on all longitudes: |
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o3_par_out(2:, 1, :, :) & |
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= spread(o3_par_out(1, 1, :, :), dim=1, ncopies=iim) |
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o3_par_out(2:, jjm + 1, :, :) & |
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= spread(o3_par_out(1, jjm + 1, :, :), dim=1, ncopies=iim) |
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! Duplicate first longitude to last longitude: |
| 275 |
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o3_par_out(iim + 1, 2:jjm, :, :) = o3_par_out(1, 2:jjm, :, :) |
| 276 |
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| 277 |
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! Write to file: |
| 278 |
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| 279 |
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ncerr = nf90_put_var(ncid_out, varid_out(i_v), & |
| 280 |
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o3_par_out(:,jjm+1:1:-1, :, :)) |
| 281 |
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! (The order of "rlatu" is inverted in the output file) |
| 282 |
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call handle_err("nf90_put_var", ncerr, ncid_out) |
| 283 |
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end do |
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| 285 |
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deallocate(plev) ! pointer |
| 286 |
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call nf95_close(ncid_out) |
| 287 |
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call nf95_close(ncid_in) |
| 288 |
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| 289 |
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end subroutine regr_coefoz |
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| 291 |
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!******************************************** |
| 292 |
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| 293 |
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subroutine prepare_out(ncid_in, varid_in, name_out, ncid_out, varid_out) |
| 294 |
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| 295 |
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! This subroutine creates the NetCDF output file, defines |
| 296 |
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! dimensions and variables, writes coordinate variables and "pls". |
| 297 |
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| 298 |
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use dimens_m, only: iim, jjm, llm |
| 299 |
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use comgeom, only: rlatu, rlonv |
| 300 |
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use pressure_m, only: pls |
| 301 |
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use comconst, only: pi |
| 302 |
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use nrutil, only: assert_eq |
| 303 |
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use netcdf95, only: nf95_create, nf90_clobber, nf95_def_dim, & |
| 305 |
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nf95_def_var, nf90_float, nf90_int, nf95_put_att, nf95_enddef, & |
| 306 |
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nf90_put_var, handle_err, nf90_copy_att, nf95_copy_att, nf90_global |
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| 308 |
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integer, intent(in):: ncid_in, varid_in(:) |
| 309 |
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character(len=*), intent(in):: name_out(:) ! of NetCDF variables |
| 310 |
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integer, intent(out):: ncid_out, varid_out(:) |
| 311 |
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| 312 |
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! Variables local to the procedure: |
| 313 |
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integer ncerr |
| 314 |
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integer dimid_rlonv, dimid_rlatu, dimid_sigs, dimid_month |
| 315 |
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integer varid_rlonv, varid_rlatu, varid_sigs, varid_month |
| 316 |
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integer varid_pls |
| 317 |
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integer i, n_o3_param |
| 318 |
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| 319 |
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!--------------------------- |
| 320 |
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| 321 |
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print *, "Call sequence information: prepare_out" |
| 322 |
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n_o3_param = assert_eq(size(varid_in), size(varid_out), & |
| 323 |
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size(name_out), "prepare_out") |
| 324 |
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|
| 325 |
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call nf95_create("coefoz_LMDZ.nc", nf90_clobber, ncid_out) |
| 326 |
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| 327 |
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! Dimensions: |
| 328 |
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call nf95_def_dim(ncid_out, "month", 12, dimid_month) |
| 329 |
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call nf95_def_dim(ncid_out, "sigs", llm, dimid_sigs) |
| 330 |
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call nf95_def_dim(ncid_out, "rlatu", jjm + 1, dimid_rlatu) |
| 331 |
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call nf95_def_dim(ncid_out, "rlonv", iim + 1, dimid_rlonv) |
| 332 |
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| 333 |
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! Coordinate variables: |
| 334 |
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| 335 |
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call nf95_def_var(ncid_out, "month", nf90_float, dimid_month, varid_month) |
| 336 |
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call nf95_put_att(ncid_out, varid_month, "units", & |
| 337 |
|
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"calendar_month as %m.%f") |
| 338 |
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call nf95_put_att(ncid_out, varid_month, "long_name", "seasonal phase") |
| 339 |
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| 340 |
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call nf95_def_var(ncid_out, "sigs", nf90_int, dimid_sigs, varid_sigs) |
| 341 |
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call nf95_put_att(ncid_out, varid_sigs, "long_name", "s-layer index") |
| 342 |
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| 343 |
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call nf95_def_var(ncid_out, "rlatu", nf90_float, dimid_rlatu, varid_rlatu) |
| 344 |
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call nf95_put_att(ncid_out, varid_rlatu, "units", "degrees_north") |
| 345 |
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call nf95_put_att(ncid_out, varid_rlatu, "long_name", "latitude") |
| 346 |
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| 347 |
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call nf95_def_var(ncid_out, "rlonv", nf90_float, dimid_rlonv, varid_rlonv) |
| 348 |
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call nf95_put_att(ncid_out, varid_rlonv, "units", "degrees_east") |
| 349 |
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call nf95_put_att(ncid_out, varid_rlonv, "long_name", "longitude") |
| 350 |
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|
| 351 |
|
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! Primary variables: |
| 352 |
|
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|
| 353 |
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call nf95_def_var(ncid_out, "pls", nf90_float, & |
| 354 |
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(/dimid_rlonv, dimid_rlatu, dimid_sigs/), varid_pls) |
| 355 |
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call nf95_put_att(ncid_out, varid_pls, "units", "millibar") |
| 356 |
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call nf95_put_att(ncid_out, varid_pls, "long_name", & |
| 357 |
|
|
"pressure at LMDZ mid-layers") |
| 358 |
|
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|
| 359 |
|
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do i = 1, n_o3_param |
| 360 |
|
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call nf95_def_var(ncid_out, name_out(i), nf90_float, & |
| 361 |
|
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(/dimid_rlonv, dimid_rlatu, dimid_sigs, dimid_month/),& |
| 362 |
|
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& varid_out(i)) |
| 363 |
|
|
! The following commands may fail. That is OK. It should just |
| 364 |
|
|
! mean that the attribute is not defined in the input file. |
| 365 |
|
|
ncerr = nf90_copy_att(ncid_in, varid_in(i), "long_name",& |
| 366 |
|
|
& ncid_out, varid_out(i)) |
| 367 |
|
|
call handle_err_copy_att("long_name") |
| 368 |
|
|
ncerr = nf90_copy_att(ncid_in, varid_in(i), "units", ncid_out,& |
| 369 |
|
|
& varid_out(i)) |
| 370 |
|
|
call handle_err_copy_att("units") |
| 371 |
|
|
ncerr = nf90_copy_att(ncid_in, varid_in(i), "standard_name", ncid_out,& |
| 372 |
|
|
& varid_out(i)) |
| 373 |
|
|
call handle_err_copy_att("standard_name") |
| 374 |
|
|
end do |
| 375 |
|
|
|
| 376 |
|
|
! Global attributes: |
| 377 |
|
|
call nf95_copy_att(ncid_in, nf90_global, "title", ncid_out, nf90_global) |
| 378 |
|
|
call nf95_copy_att(ncid_in, nf90_global, "source", ncid_out, nf90_global) |
| 379 |
|
|
call nf95_put_att(ncid_out, nf90_global, "comment", "Regridded for LMDZ") |
| 380 |
|
|
|
| 381 |
|
|
call nf95_enddef(ncid_out) |
| 382 |
|
|
|
| 383 |
|
|
! Coordinate variables: |
| 384 |
|
|
|
| 385 |
|
|
ncerr = nf90_put_var(ncid_out, varid_month, (/(i + 0.5, i = 1, 12)/)) |
| 386 |
|
|
call handle_err("nf90_put_var", ncerr, ncid_out) |
| 387 |
|
|
|
| 388 |
|
|
ncerr = nf90_put_var(ncid_out, varid_sigs, (/(i, i = 1, llm)/)) |
| 389 |
|
|
call handle_err("nf90_put_var", ncerr, ncid_out) |
| 390 |
|
|
|
| 391 |
|
|
ncerr = nf90_put_var(ncid_out, varid_rlatu, rlatu(jjm+1:1:-1) / pi * 180.) |
| 392 |
|
|
! (convert from rad to degrees and sort in increasing order) |
| 393 |
|
|
call handle_err("nf90_put_var", ncerr, ncid_out) |
| 394 |
|
|
|
| 395 |
|
|
ncerr = nf90_put_var(ncid_out, varid_rlonv, rlonv(:) / pi * 180.) |
| 396 |
|
|
! (convert from rad to degrees) |
| 397 |
|
|
call handle_err("nf90_put_var", ncerr, ncid_out) |
| 398 |
|
|
|
| 399 |
|
|
! Primary variable: |
| 400 |
|
|
|
| 401 |
|
|
ncerr = nf90_put_var(ncid_out, varid_pls, pls(:, jjm+1:1:-1, :) / 100.) |
| 402 |
|
|
! (convert from Pa to hPa) |
| 403 |
|
|
call handle_err("nf90_put_var", ncerr, ncid_out) |
| 404 |
|
|
|
| 405 |
|
|
contains |
| 406 |
|
|
|
| 407 |
|
|
subroutine handle_err_copy_att(att_name) |
| 408 |
|
|
|
| 409 |
|
|
use netcdf95, only: nf90_noerr, nf90_strerror |
| 410 |
|
|
|
| 411 |
|
|
character(len=*), intent(in):: att_name |
| 412 |
|
|
|
| 413 |
|
|
!---------------------------------------- |
| 414 |
|
|
|
| 415 |
|
|
if (ncerr /= nf90_noerr) then |
| 416 |
|
|
print *, "prepare_out " // trim(name_out(i)) & |
| 417 |
|
|
// " nf90_copy_att " // att_name // " -- " & |
| 418 |
|
|
// trim(nf90_strerror(ncerr)) |
| 419 |
|
|
end if |
| 420 |
|
|
|
| 421 |
|
|
end subroutine handle_err_copy_att |
| 422 |
|
|
|
| 423 |
|
|
end subroutine prepare_out |
| 424 |
|
|
|
| 425 |
|
|
end module regr_coefoz_m |
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