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module o3_chem_m |
module o3_chem_m |
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! This module is clean: no C preprocessor directive, no include line. |
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IMPLICIT none |
IMPLICIT none |
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private o3_prod |
private o3_prod |
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! This procedure evolves the ozone mass fraction through a time |
! This procedure evolves the ozone mass fraction through a time |
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! step taking only chemistry into account. |
! step taking only chemistry into account. |
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use nrutil, only: assert |
! All the 2-dimensional arrays are on the "physics" grid. |
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! Their shape is "(/klon, llm/)". |
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! Index "(i, :)" is for longitude "rlon(i)", latitude "rlat(i)". |
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use nr_util, only: assert, pi |
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use dimphy, only: klon |
use dimphy, only: klon |
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use dimens_m, only: llm |
use dimens_m, only: llm |
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use read_coefoz_m, only: c_Mob, a4_mass, a2, r_het_interm |
use regr_pr_comb_coefoz_m, only: c_Mob, a4_mass, a2, r_het_interm |
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use orbite_m, only: orbite, zenang |
use orbite_m, only: orbite, zenang |
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use nrtype, only: pi |
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integer, intent(in):: julien ! jour julien, 1 <= julien <= 360 |
integer, intent(in):: julien ! jour julien, 1 <= julien <= 360 |
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real, intent(in):: gmtime ! heure de la journée en fraction de jour |
real, intent(in):: gmtime ! heure de la journée en fraction de jour |
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real, intent(in):: t_seri(:, :) ! temperature, in K |
real, intent(in):: t_seri(:, :) ! (klon, llm) temperature, in K |
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real, intent(in):: zmasse(:, :) |
real, intent(in):: zmasse(:, :) ! (klon, llm) |
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! (column-density of mass of air in a cell, in kg m-2) |
! (column-density of mass of air in a cell, in kg m-2) |
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! (On the "physics" grid. |
! "zmasse(:, k)" is for layer "k".) |
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! "zmasse(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", for |
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! layer "k".) |
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real, intent(in):: pdtphys ! time step for physics, in s |
real, intent(in):: pdtphys ! time step for physics, in s |
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real, intent(inout):: q(:, :) ! mass fraction of ozone |
real, intent(inout):: q(:, :) ! (klon, llm) mass fraction of ozone |
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! (On the "physics" grid. |
! "q(:, k)" is at middle of layer "k".) |
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! "q(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of |
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! layer "k".) |
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! Variables local to the procedure: |
! Variables local to the procedure: |
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integer month, k |
integer k |
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real c(klon, llm) |
real c(klon, llm) |
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! (constant term during a time step in the net mass production |
! (constant term during a time step in the net mass production |
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! rate of ozone by chemistry, per unit mass of air, in s-1) |
! rate of ozone by chemistry, per unit mass of air, in s-1) |
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! (On the "physics" grid. |
! "c(:, k)" is at middle of layer "k".) |
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! "c(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of |
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! layer "k".) |
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real b(klon, llm) |
real b(klon, llm) |
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! (coefficient of "q" in the net mass production |
! (coefficient of "q" in the net mass production |
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! rate of ozone by chemistry, per unit mass of air, in s-1) |
! rate of ozone by chemistry, per unit mass of air, in s-1) |
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! (On the "physics" grid. |
! "b(:, k)" is at middle of layer "k".) |
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! "b(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of |
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! layer "k".) |
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real dq_o3_chem(klon, llm) |
real dq_o3_chem(klon, llm) |
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! (variation of ozone mass fraction due to chemistry during a time step) |
! (variation of ozone mass fraction due to chemistry during a time step) |
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! (On the "physics" grid. |
! "dq_o3_chem(:, k)" is at middle of layer "k".) |
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! "dq_o3_chem(i, k)" is at longitude "rlon(i)", latitude |
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! "rlat(i)", middle of layer "k".) |
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real earth_long |
real earth_long |
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! (longitude vraie de la Terre dans son orbite solaire, par |
! (longitude vraie de la Terre dans son orbite solaire, par |
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call assert(llm == (/size(q, 2), size(t_seri, 2), size(zmasse, 2)/), & |
call assert(llm == (/size(q, 2), size(t_seri, 2), size(zmasse, 2)/), & |
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"o3_chem llm") |
"o3_chem llm") |
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month = (julien - 1) / 30 + 1 ! compute the month from the day number |
c = c_Mob + a4_mass * t_seri |
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c = c_Mob(:, :, month) + a4_mass(:, :, month) * t_seri |
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! Compute coefficient "b": |
! Compute coefficient "b": |
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! Heterogeneous chemistry is only at low temperature: |
! Heterogeneous chemistry is only at low temperature: |
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where (t_seri < 195.) |
where (t_seri < 195.) |
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b = r_het_interm(:, :, month) |
b = r_het_interm |
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elsewhere |
elsewhere |
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b = 0. |
b = 0. |
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end where |
end where |
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where (pmu0 <= cos(87. / 180. * pi)) b(:, k) = 0. |
where (pmu0 <= cos(87. / 180. * pi)) b(:, k) = 0. |
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end forall |
end forall |
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b = b + a2(:, :, month) |
b = b + a2 |
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! Midpoint method: |
! Midpoint method: |
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! Trial step to the midpoint: |
! Trial step to the midpoint: |
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dq_o3_chem = o3_prod(q, month, zmasse, c, b) * pdtphys / 2 |
dq_o3_chem = o3_prod(q, zmasse, c, b) * pdtphys / 2 |
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! "Real" step across the whole interval: |
! "Real" step across the whole interval: |
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dq_o3_chem = o3_prod(q + dq_o3_chem, month, zmasse, c, b) * pdtphys |
dq_o3_chem = o3_prod(q + dq_o3_chem, zmasse, c, b) * pdtphys |
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q = q + dq_o3_chem |
q = q + dq_o3_chem |
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! Confine the mass fraction: |
! Confine the mass fraction: |
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!************************************************* |
!************************************************* |
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function o3_prod(q, month, zmasse, c, b) |
function o3_prod(q, zmasse, c, b) |
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! This function computes the production rate of ozone by chemistry. |
! This function computes the production rate of ozone by chemistry. |
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use read_coefoz_m, only: a6_mass |
! All the 2-dimensional arrays are on the "physics" grid. |
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use nrutil, only: assert |
! Their shape is "(/klon, llm/)". |
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! Index "(i, :)" is for longitude "rlon(i)", latitude "rlat(i)". |
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use regr_pr_comb_coefoz_m, only: a6_mass |
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use nr_util, only: assert |
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use dimens_m, only: llm |
use dimens_m, only: llm |
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use dimphy, only: klon |
use dimphy, only: klon |
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real, intent(in):: q(:, :) ! mass fraction of ozone |
real, intent(in):: q(:, :) ! mass fraction of ozone |
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! (On the "physics" grid. |
! "q(:, k)" is at middle of layer "k".) |
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! "q(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of |
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! layer "k".) |
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integer, intent(in):: month |
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real, intent(in):: zmasse(:, :) |
real, intent(in):: zmasse(:, :) |
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! (column-density of mass of air in a layer, in kg m-2) |
! (column-density of mass of air in a layer, in kg m-2) |
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! (On the "physics" grid. |
! ("zmasse(:, k)" is for layer "k".) |
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! "zmasse(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of |
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! layer "k".) |
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real, intent(in):: c(:, :) |
real, intent(in):: c(:, :) |
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! (constant term during a time step in the net mass production |
! (constant term during a time step in the net mass production |
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! rate of ozone by chemistry, per unit mass of air, in s-1) |
! rate of ozone by chemistry, per unit mass of air, in s-1) |
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! (On the "physics" grid. |
! "c(:, k)" is at middle of layer "k".) |
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! "c(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of |
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! layer "k".) |
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real, intent(in):: b(:, :) |
real, intent(in):: b(:, :) |
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! (coefficient of "q" in the net mass production |
! (coefficient of "q" in the net mass production rate of ozone by |
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! rate of ozone by chemistry, per unit mass of air, in s-1) |
! chemistry, per unit mass of air, in s-1) |
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! (On the "physics" grid. |
! ("b(:, k)" is at middle of layer "k".) |
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! "b(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of |
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! layer "k".) |
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real o3_prod(klon, llm) |
real o3_prod(klon, llm) |
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! (net mass production rate of ozone by chemistry, per unit mass |
! (net mass production rate of ozone by chemistry, per unit mass |
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! of air, in s-1) |
! of air, in s-1) |
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! (On the "physics" grid. |
! ("o3_prod(:, k)" is at middle of layer "k".) |
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! "o3_prod(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of |
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! layer "k".) |
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! Variables local to the procedure: |
! Variables local to the procedure: |
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real sigma_mass(klon, llm) |
real sigma_mass(klon, llm) |
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! (mass column-density of ozone above point, in kg m-2) |
! (mass column-density of ozone above point, in kg m-2) |
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! (On the "physics" grid. |
! ("sigma_mass(:, k)" is at middle of layer "k".) |
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! "sigma_mass(i, k)" is at longitude "rlon(i)", latitude |
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! "rlat(i)", middle of layer "k".) |
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integer k |
integer k |
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sigma_mass(:, k) = sigma_mass(:, k+1) + zmasse(:, k) * q(:, k) |
sigma_mass(:, k) = sigma_mass(:, k+1) + zmasse(:, k) * q(:, k) |
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end do |
end do |
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o3_prod = c + b * q + a6_mass(:, :, month) * sigma_mass |
o3_prod = c + b * q + a6_mass * sigma_mass |
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end function o3_prod |
end function o3_prod |
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