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guez |
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module read_coefoz_m |
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! This module is clean: no C preprocessor directive, no include line. |
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use dimens_m, only: llm |
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use dimphy, only: klon |
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implicit none |
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real, save:: c_Mob(klon, llm, 12) |
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! (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) |
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! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
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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".) |
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real, save:: a2(klon, llm, 12) |
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! (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) |
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! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
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! "a2(i, k, month)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
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real, save:: a4_mass(klon, llm, 12) |
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! (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) |
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! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
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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".) |
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real, save:: a6_mass(klon, llm, 12) |
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! (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) |
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! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
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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".) |
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real, save:: r_het_interm(klon, llm, 12) |
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! (net mass production rate by heterogeneous chemistry, per unit |
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! mass of ozone, corrected for chlorine content and latitude, but |
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! not for temperature and sun direction, in s-1) |
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! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
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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".) |
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private klon, llm |
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contains |
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subroutine read_coefoz |
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! This subroutine reads from a file all eight parameters for ozone |
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! chemistry, at all months. |
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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 |
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use o3_Mob_ph_m, only: o3_Mob_ph |
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use phyetat0_m, only: rlat |
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! Variables local to the procedure: |
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integer ncid ! for NetCDF |
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real a6(klon, llm, 12) |
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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) |
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! (On the "physics" grid. |
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! Third dimension is the number of the month in the year. |
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! "a6(i, k, month)" is at longitude "rlon(i)", latitude "rlat(i)", |
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! middle of layer "k".) |
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real, parameter:: amu = 1.6605402e-27 ! atomic mass unit, in kg |
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real, parameter:: Clx = 3.8e-9 |
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! (total chlorine content in the upper stratosphere) |
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integer k, month |
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!------------------------------------ |
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print *, "Call sequence information: read_coefoz" |
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call nf95_open("coefoz_LMDZ.nc", nf90_nowrite, ncid) |
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a2 = o3_Mob_ph(ncid, "a2") |
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a4_mass = o3_Mob_ph(ncid, "a4") * 48. / 29. |
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a6 = o3_Mob_ph(ncid, "a6") |
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! Compute "a6_mass" avoiding underflow, do not divide by 1e4 |
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! before dividing by molecular mass: |
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a6_mass = a6 / (1e4 * 29. * amu) |
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! (factor 1e4: conversion from cm2 to m2) |
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c_Mob = 48. / 29. * (o3_Mob_ph(ncid, "P_net_Mob") & |
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- a2 * o3_Mob_ph(ncid, "r_Mob") - a6 * o3_Mob_ph(ncid, "Sigma_Mob")) & |
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- a4_mass * o3_Mob_ph(ncid, "temp_Mob") |
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r_het_interm = o3_Mob_ph(ncid, "R_Het") * (Clx / 3.8e-9)**2 |
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! Heterogeneous chemistry is only at high latitudes: |
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forall (k = 1: llm, month = 1: 12) |
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where (abs(rlat) <= 45.) r_het_interm(:, k, month) = 0. |
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end forall |
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call nf95_close(ncid) |
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end subroutine read_coefoz |
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end module read_coefoz_m |
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