libf/phylmd/read_coefoz_m.f90

module regr_pr_comb_coefoz_m

  ! This module is clean: no C preprocessor directive, no include line.

  use dimens_m, only: llm
  use dimphy, only: klon

  implicit none

  real, save:: c_Mob(klon, llm)
  ! (sum of Mobidic terms in the net mass production rate of ozone
  ! by chemistry, per unit mass of air, in s-1)
  ! (On the "physics" grid.
  ! "c_Mob(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
  ! middle of layer "k".)

  real, save:: a2(klon, llm)
  ! (derivative of mass production rate of ozone per unit mass of
  ! air with respect to ozone mass fraction, in s-1)
  ! (On the "physics" grid.
  ! "a2(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
  ! middle of layer "k".)

  real, save:: a4_mass(klon, llm)
  ! (derivative of mass production rate of ozone per unit mass of
  ! air with respect to temperature, in s-1 K-1)
  ! (On the "physics" grid.
  ! "a4_mass(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
  ! middle of layer "k".)

  real, save:: a6_mass(klon, llm)
  ! (derivative of mass production rate of ozone per unit mass of
  ! air with respect to mass column-density of ozone above, in m2 s-1 kg-1)
  ! (On the "physics" grid.
  ! "a6_mass(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
  ! middle of layer "k".)

  real, save:: r_het_interm(klon, llm)
  ! (net mass production rate by heterogeneous chemistry, per unit
  ! mass of ozone, corrected for chlorine content and latitude, but
  ! not for temperature and sun direction, in s-1)
  ! (On the "physics" grid.
  ! "r_het_interm(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
  ! middle of layer "k".)

  private klon, llm

contains

  subroutine regr_pr_comb_coefoz(julien)

    ! "regr_pr_comb_coefoz" stands for "regrid pressure combine
    ! coefficients ozone".

    ! This subroutine :
    ! -- reads from a file all eight parameters for ozone chemistry,
    !    at the current day ;
    ! -- regrids the parameters in pressure to the LMDZ vertical grid ;
    ! -- packs the parameters to the "physics" horizontal grid ;
    ! -- combines the eight parameters to define the five module variables.

    ! We assume that, in "coefoz_LMDZ.nc", the pressure levels are in hPa
    ! and strictly increasing.

    use netcdf95, only: nf95_open, nf95_close, nf95_get_coord
    use netcdf, only: nf90_nowrite
    use regr_pr_coefoz, only: regr_pr_av_coefoz, regr_pr_int_coefoz
    use phyetat0_m, only: rlat

    integer, intent(in):: julien ! jour julien, 1 <= julien <= 360

    ! Variables local to the procedure:
    integer ncid ! for NetCDF

    real, pointer:: plev(:)
    ! (pressure level of input data, converted to Pa, in strictly
    ! increasing order)

    integer n_plev ! number of pressure levels in the input data

    real, allocatable:: press_in_edg(:)
    ! (edges of pressure intervals for input data, in Pa, in strictly
    ! increasing order)

    real coefoz(klon, llm)
    ! (temporary storage for an ozone coefficient)
    ! (On the "physics" grid.
    ! "coefoz(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
    ! middle of layer "k".)

    real a6(klon, llm)
    ! (derivative of "P_net_Mob" with respect to column-density of ozone
    ! above, in cm2 s-1)
    ! (On the "physics" grid.
    ! "a6(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
    ! middle of layer "k".)

    real, parameter:: amu = 1.6605402e-27 ! atomic mass unit, in kg

    real, parameter:: Clx = 3.8e-9
    ! (total chlorine content in the upper stratosphere)

    integer k

    !------------------------------------

    print *, "Call sequence information: read_coefoz"

    call nf95_open("coefoz_LMDZ.nc", nf90_nowrite, ncid)

    call nf95_get_coord(ncid, "plev", plev)
    ! Convert from hPa to Pa because "regr_pr_av" and "regr_pr_int" require so:
    plev = plev * 100.
    n_plev = size(plev)

    ! Compute edges of pressure intervals:
    allocate(press_in_edg(n_plev + 1))
    press_in_edg(1) = 0.
    ! We choose edges halfway in logarithm:
    forall (k = 2:n_plev) press_in_edg(k) = sqrt(plev(k - 1) * plev(k))
    press_in_edg(n_plev + 1) = huge(0.)
    ! (infinity, but any value guaranteed to be greater than the
    ! surface pressure would do)

    call regr_pr_av_coefoz(ncid, "a2", julien, press_in_edg, a2)

    call regr_pr_av_coefoz(ncid, "a4", julien, press_in_edg, a4_mass)
    a4_mass = a4_mass * 48. / 29.

    call regr_pr_av_coefoz(ncid, "a6", julien, press_in_edg, a6)

    ! Compute "a6_mass" avoiding underflow, do not divide by 1e4
    ! before dividing by molecular mass:
    a6_mass = a6 / (1e4 * 29. * amu)
    ! (factor 1e4: conversion from cm2 to m2)

    ! Combine coefficients to get "c_Mob":
    ! (We use as few local variables as possible, in order to spare
    ! main memory.)

    call regr_pr_av_coefoz(ncid, "P_net_Mob", julien, press_in_edg, c_Mob)

    call regr_pr_av_coefoz(ncid, "r_Mob", julien, press_in_edg, coefoz)
    c_mob = c_mob - a2 * coeofoz

    call regr_pr_int_coefoz(ncid, "Sigma_Mob", julien, plev, top_value=0., &
         coefoz)
    c_mob = (c_mob - a6 * coefoz) * 48. / 29.

    call regr_pr_av_coefoz(ncid, "temp_Mob", julien, press_in_edg, coefoz)
    c_mob = c_mob - a4_mass * coefoz

    call regr_pr_av_coefoz(ncid, "R_Het", julien, press_in_edg, r_het_interm)
    ! Heterogeneous chemistry is only at high latitudes:
    forall (k = 1: llm)
       where (abs(rlat) <= 45.) r_het_interm(:, k) = 0.
    end forall
    where (r_het_interm  /= 0.) r_het_interm = r_het_interm * (Clx / 3.8e-9)**2

    deallocate(plev) ! pointer
    call nf95_close(ncid)

  end subroutine regr_pr_comb_coefoz

end module regr_pr_comb_coefoz_m
1	module regr_pr_comb_coefoz_m
2
3	! This module is clean: no C preprocessor directive, no include line.
4
5	use dimens_m, only: llm
6	use dimphy, only: klon
7
8	implicit none
9
10	real, save:: c_Mob(klon, llm)
11	! (sum of Mobidic terms in the net mass production rate of ozone
12	! by chemistry, per unit mass of air, in s-1)
13	! (On the "physics" grid.
14	! "c_Mob(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
15	! middle of layer "k".)
16
17	real, save:: a2(klon, llm)
18	! (derivative of mass production rate of ozone per unit mass of
19	! air with respect to ozone mass fraction, in s-1)
20	! (On the "physics" grid.
21	! "a2(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
22	! middle of layer "k".)
23
24	real, save:: a4_mass(klon, llm)
25	! (derivative of mass production rate of ozone per unit mass of
26	! air with respect to temperature, in s-1 K-1)
27	! (On the "physics" grid.
28	! "a4_mass(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
29	! middle of layer "k".)
30
31	real, save:: a6_mass(klon, llm)
32	! (derivative of mass production rate of ozone per unit mass of
33	! air with respect to mass column-density of ozone above, in m2 s-1 kg-1)
34	! (On the "physics" grid.
35	! "a6_mass(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
36	! middle of layer "k".)
37
38	real, save:: r_het_interm(klon, llm)
39	! (net mass production rate by heterogeneous chemistry, per unit
40	! mass of ozone, corrected for chlorine content and latitude, but
41	! not for temperature and sun direction, in s-1)
42	! (On the "physics" grid.
43	! "r_het_interm(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
44	! middle of layer "k".)
45
46	private klon, llm
47
48	contains
49
50	subroutine regr_pr_comb_coefoz(julien)
51
52	! "regr_pr_comb_coefoz" stands for "regrid pressure combine
53	! coefficients ozone".
54
55	! This subroutine :
56	! -- reads from a file all eight parameters for ozone chemistry,
57	! at the current day ;
58	! -- regrids the parameters in pressure to the LMDZ vertical grid ;
59	! -- packs the parameters to the "physics" horizontal grid ;
60	! -- combines the eight parameters to define the five module variables.
61
62	! We assume that, in "coefoz_LMDZ.nc", the pressure levels are in hPa
63	! and strictly increasing.
64
65	use netcdf95, only: nf95_open, nf95_close, nf95_get_coord
66	use netcdf, only: nf90_nowrite
67	use regr_pr_coefoz, only: regr_pr_av_coefoz, regr_pr_int_coefoz
68	use phyetat0_m, only: rlat
69
70	integer, intent(in):: julien ! jour julien, 1 <= julien <= 360
71
72	! Variables local to the procedure:
73	integer ncid ! for NetCDF
74
75	real, pointer:: plev(:)
76	! (pressure level of input data, converted to Pa, in strictly
77	! increasing order)
78
79	integer n_plev ! number of pressure levels in the input data
80
81	real, allocatable:: press_in_edg(:)
82	! (edges of pressure intervals for input data, in Pa, in strictly
83	! increasing order)
84
85	real coefoz(klon, llm)
86	! (temporary storage for an ozone coefficient)
87	! (On the "physics" grid.
88	! "coefoz(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
89	! middle of layer "k".)
90
91	real a6(klon, llm)
92	! (derivative of "P_net_Mob" with respect to column-density of ozone
93	! above, in cm2 s-1)
94	! (On the "physics" grid.
95	! "a6(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
96	! middle of layer "k".)
97
98	real, parameter:: amu = 1.6605402e-27 ! atomic mass unit, in kg
99
100	real, parameter:: Clx = 3.8e-9
101	! (total chlorine content in the upper stratosphere)
102
103	integer k
104
105	!------------------------------------
106
107	print *, "Call sequence information: read_coefoz"
108
109	call nf95_open("coefoz_LMDZ.nc", nf90_nowrite, ncid)
110
111	call nf95_get_coord(ncid, "plev", plev)
112	! Convert from hPa to Pa because "regr_pr_av" and "regr_pr_int" require so:
113	plev = plev * 100.
114	n_plev = size(plev)
115
116	! Compute edges of pressure intervals:
117	allocate(press_in_edg(n_plev + 1))
118	press_in_edg(1) = 0.
119	! We choose edges halfway in logarithm:
120	forall (k = 2:n_plev) press_in_edg(k) = sqrt(plev(k - 1) * plev(k))
121	press_in_edg(n_plev + 1) = huge(0.)
122	! (infinity, but any value guaranteed to be greater than the
123	! surface pressure would do)
124
125	call regr_pr_av_coefoz(ncid, "a2", julien, press_in_edg, a2)
126
127	call regr_pr_av_coefoz(ncid, "a4", julien, press_in_edg, a4_mass)
128	a4_mass = a4_mass * 48. / 29.
129
130	call regr_pr_av_coefoz(ncid, "a6", julien, press_in_edg, a6)
131
132	! Compute "a6_mass" avoiding underflow, do not divide by 1e4
133	! before dividing by molecular mass:
134	a6_mass = a6 / (1e4 * 29. * amu)
135	! (factor 1e4: conversion from cm2 to m2)
136
137	! Combine coefficients to get "c_Mob":
138	! (We use as few local variables as possible, in order to spare
139	! main memory.)
140
141	call regr_pr_av_coefoz(ncid, "P_net_Mob", julien, press_in_edg, c_Mob)
142
143	call regr_pr_av_coefoz(ncid, "r_Mob", julien, press_in_edg, coefoz)
144	c_mob = c_mob - a2 * coeofoz
145
146	call regr_pr_int_coefoz(ncid, "Sigma_Mob", julien, plev, top_value=0., &
147	coefoz)
148	c_mob = (c_mob - a6 * coefoz) * 48. / 29.
149
150	call regr_pr_av_coefoz(ncid, "temp_Mob", julien, press_in_edg, coefoz)
151	c_mob = c_mob - a4_mass * coefoz
152
153	call regr_pr_av_coefoz(ncid, "R_Het", julien, press_in_edg, r_het_interm)
154	! Heterogeneous chemistry is only at high latitudes:
155	forall (k = 1: llm)
156	where (abs(rlat) <= 45.) r_het_interm(:, k) = 0.
157	end forall
158	where (r_het_interm /= 0.) r_het_interm = r_het_interm * (Clx / 3.8e-9)**2
159
160	deallocate(plev) ! pointer
161	call nf95_close(ncid)
162
163	end subroutine regr_pr_comb_coefoz
164
165	end module regr_pr_comb_coefoz_m