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module read_coefoz_m |
module regr_pr_comb_coefoz_m |
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! This module is clean: no C preprocessor directive, no include line. |
! This module is clean: no C preprocessor directive, no include line. |
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implicit none |
implicit none |
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real, save:: c_Mob(klon, llm, 12) |
real, save:: c_Mob(klon, llm) |
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! (sum of Mobidic terms in the net mass production rate of ozone |
! (sum of Mobidic terms in the net mass production rate of ozone |
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! by chemistry, per unit mass of air, in s-1) |
! by chemistry, per unit mass of air, in s-1) |
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! (On the "physics" grid. |
! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
! "c_Mob(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! "c_Mob(i, k, month)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
! middle of layer "k".) |
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real, save:: a2(klon, llm, 12) |
real, save:: a2(klon, llm) |
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! (derivative of mass production rate of ozone per unit mass of |
! (derivative of mass production rate of ozone per unit mass of |
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! air with respect to ozone mass fraction, in s-1) |
! air with respect to ozone mass fraction, in s-1) |
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! (On the "physics" grid. |
! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
! "a2(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! "a2(i, k, month)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
! middle of layer "k".) |
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real, save:: a4_mass(klon, llm, 12) |
real, save:: a4_mass(klon, llm) |
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! (derivative of mass production rate of ozone per unit mass of |
! (derivative of mass production rate of ozone per unit mass of |
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! air with respect to temperature, in s-1 K-1) |
! air with respect to temperature, in s-1 K-1) |
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! (On the "physics" grid. |
! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
! "a4_mass(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! "a4_mass(i, k, month)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
! middle of layer "k".) |
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real, save:: a6_mass(klon, llm, 12) |
real, save:: a6_mass(klon, llm) |
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! (derivative of mass production rate of ozone per unit mass of |
! (derivative of mass production rate of ozone per unit mass of |
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! air with respect to mass column-density of ozone above, in m2 s-1 kg-1) |
! air with respect to mass column-density of ozone above, in m2 s-1 kg-1) |
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! (On the "physics" grid. |
! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
! "a6_mass(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! "a6_mass(i, k, month)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
! middle of layer "k".) |
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real, save:: r_het_interm(klon, llm, 12) |
real, save:: r_het_interm(klon, llm) |
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! (net mass production rate by heterogeneous chemistry, per unit |
! (net mass production rate by heterogeneous chemistry, per unit |
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! mass of ozone, corrected for chlorine content and latitude, but |
! mass of ozone, corrected for chlorine content and latitude, but |
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! not for temperature and sun direction, in s-1) |
! not for temperature and sun direction, in s-1) |
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! (On the "physics" grid. |
! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
! "r_het_interm(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! "r_het_interm(i, k, month)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
! middle of layer "k".) |
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private klon, llm |
private klon, llm |
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contains |
contains |
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subroutine read_coefoz |
subroutine regr_pr_comb_coefoz(julien) |
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! This subroutine reads from a file all eight parameters for ozone |
! "regr_pr_comb_coefoz" stands for "regrid pressure combine |
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! chemistry, at all months. |
! coefficients ozone". |
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! The parameters are packed to the "physics" grid. |
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! Finally, the eight parameters are combined to define the five |
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! module variables. |
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use netcdf95, only: nf95_open, nf95_close, nf90_nowrite |
! This subroutine : |
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use o3_Mob_ph_m, only: o3_Mob_ph |
! -- reads from a file all eight parameters for ozone chemistry, |
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! at the current day ; |
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! -- regrids the parameters in pressure to the LMDZ vertical grid ; |
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! -- packs the parameters to the "physics" horizontal grid ; |
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! -- combines the eight parameters to define the five module variables. |
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! We assume that, in "coefoz_LMDZ.nc", the pressure levels are in hPa |
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! and strictly increasing. |
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use netcdf95, only: nf95_open, nf95_close, nf95_get_coord |
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use netcdf, only: nf90_nowrite |
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use regr_pr_coefoz, only: regr_pr_av_coefoz, regr_pr_int_coefoz |
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use phyetat0_m, only: rlat |
use phyetat0_m, only: rlat |
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integer, intent(in):: julien ! jour julien, 1 <= julien <= 360 |
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! Variables local to the procedure: |
! Variables local to the procedure: |
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integer ncid ! for NetCDF |
integer ncid ! for NetCDF |
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real a6(klon, llm, 12) |
real, pointer:: plev(:) |
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! (derivative of P_net_Mob with respect to column-density of ozone |
! (pressure level of input data, converted to Pa, in strictly |
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! increasing order) |
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integer n_plev ! number of pressure levels in the input data |
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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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real coefoz(klon, llm) |
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! (temporary storage for an ozone coefficient) |
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! (On the "physics" grid. |
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! "coefoz(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
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real a6(klon, llm) |
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! (derivative of "P_net_Mob" with respect to column-density of ozone |
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! above, in cm2 s-1) |
! above, in cm2 s-1) |
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! (On the "physics" grid. |
! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
! "a6(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! "a6(i, k, month)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
! middle of layer "k".) |
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real, parameter:: amu = 1.6605402e-27 ! atomic mass unit, in kg |
real, parameter:: amu = 1.6605402e-27 ! atomic mass unit, in kg |
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real, parameter:: Clx = 3.8e-9 |
real, parameter:: Clx = 3.8e-9 |
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! (total chlorine content in the upper stratosphere) |
! (total chlorine content in the upper stratosphere) |
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integer k, month |
integer k |
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!------------------------------------ |
!------------------------------------ |
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call nf95_open("coefoz_LMDZ.nc", nf90_nowrite, ncid) |
call nf95_open("coefoz_LMDZ.nc", nf90_nowrite, ncid) |
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a2 = o3_Mob_ph(ncid, "a2") |
call nf95_get_coord(ncid, "plev", plev) |
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a4_mass = o3_Mob_ph(ncid, "a4") * 48. / 29. |
! Convert from hPa to Pa because "regr_pr_av" and "regr_pr_int" require so: |
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a6 = o3_Mob_ph(ncid, "a6") |
plev = plev * 100. |
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n_plev = size(plev) |
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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 (k = 2:n_plev) press_in_edg(k) = sqrt(plev(k - 1) * plev(k)) |
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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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call regr_pr_av_coefoz(ncid, "a2", julien, press_in_edg, a2) |
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call regr_pr_av_coefoz(ncid, "a4", julien, press_in_edg, a4_mass) |
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a4_mass = a4_mass * 48. / 29. |
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call regr_pr_av_coefoz(ncid, "a6", julien, press_in_edg, a6) |
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! Compute "a6_mass" avoiding underflow, do not divide by 1e4 |
! Compute "a6_mass" avoiding underflow, do not divide by 1e4 |
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! before dividing by molecular mass: |
! before dividing by molecular mass: |
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a6_mass = a6 / (1e4 * 29. * amu) |
a6_mass = a6 / (1e4 * 29. * amu) |
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! (factor 1e4: conversion from cm2 to m2) |
! (factor 1e4: conversion from cm2 to m2) |
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c_Mob = 48. / 29. * (o3_Mob_ph(ncid, "P_net_Mob") & |
! Combine coefficients to get "c_Mob": |
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- a2 * o3_Mob_ph(ncid, "r_Mob") - a6 * o3_Mob_ph(ncid, "Sigma_Mob")) & |
! (We use as few local variables as possible, in order to spare |
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- a4_mass * o3_Mob_ph(ncid, "temp_Mob") |
! main memory.) |
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call regr_pr_av_coefoz(ncid, "P_net_Mob", julien, press_in_edg, c_Mob) |
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call regr_pr_av_coefoz(ncid, "r_Mob", julien, press_in_edg, coefoz) |
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c_mob = c_mob - a2 * coeofoz |
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call regr_pr_int_coefoz(ncid, "Sigma_Mob", julien, plev, top_value=0., & |
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coefoz) |
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c_mob = (c_mob - a6 * coefoz) * 48. / 29. |
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call regr_pr_av_coefoz(ncid, "temp_Mob", julien, press_in_edg, coefoz) |
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c_mob = c_mob - a4_mass * coefoz |
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r_het_interm = o3_Mob_ph(ncid, "R_Het") * (Clx / 3.8e-9)**2 |
call regr_pr_av_coefoz(ncid, "R_Het", julien, press_in_edg, r_het_interm) |
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! Heterogeneous chemistry is only at high latitudes: |
! Heterogeneous chemistry is only at high latitudes: |
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forall (k = 1: llm, month = 1: 12) |
forall (k = 1: llm) |
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where (abs(rlat) <= 45.) r_het_interm(:, k, month) = 0. |
where (abs(rlat) <= 45.) r_het_interm(:, k) = 0. |
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end forall |
end forall |
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where (r_het_interm /= 0.) r_het_interm = r_het_interm * (Clx / 3.8e-9)**2 |
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deallocate(plev) ! pointer |
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call nf95_close(ncid) |
call nf95_close(ncid) |
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end subroutine read_coefoz |
end subroutine regr_pr_comb_coefoz |
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end module read_coefoz_m |
end module regr_pr_comb_coefoz_m |
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