phylmd/Mobidic/regr_pr_comb_coefoz.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 * coefoz

    call regr_pr_int_coefoz(ncid, "Sigma_Mob", julien, plev, top_value=0., &
         v3=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	guez	7	module regr_pr_comb_coefoz_m
2	guez	3
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	guez	7	real, save:: c_Mob(klon, llm)
11	guez	3	! (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	guez	7	! "c_Mob(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
15	guez	3	! middle of layer "k".)
16
17	guez	7	real, save:: a2(klon, llm)
18	guez	3	! (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	guez	7	! "a2(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
22	guez	3	! middle of layer "k".)
23
24	guez	7	real, save:: a4_mass(klon, llm)
25	guez	3	! (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	guez	7	! "a4_mass(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
29	guez	3	! middle of layer "k".)
30
31	guez	7	real, save:: a6_mass(klon, llm)
32	guez	3	! (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	guez	7	! "a6_mass(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
36	guez	3	! middle of layer "k".)
37
38	guez	7	real, save:: r_het_interm(klon, llm)
39	guez	3	! (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	guez	7	! "r_het_interm(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
44	guez	3	! middle of layer "k".)
45
46			private klon, llm
47
48			contains
49
50	guez	7	subroutine regr_pr_comb_coefoz(julien)
51	guez	3
52	guez	7	! "regr_pr_comb_coefoz" stands for "regrid pressure combine
53			! coefficients ozone".
54	guez	3
55	guez	7	! 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	guez	3	use phyetat0_m, only: rlat
69
70	guez	7	integer, intent(in):: julien ! jour julien, 1 <= julien <= 360
71
72	guez	3	! Variables local to the procedure:
73			integer ncid ! for NetCDF
74
75	guez	7	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	guez	3	! above, in cm2 s-1)
94			! (On the "physics" grid.
95	guez	7	! "a6(i, k)" is at longitude "rlon(i)", latitude "rlat(i)",
96	guez	3	! 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	guez	7	integer k
104	guez	3
105			!------------------------------------
106
107			print *, "Call sequence information: read_coefoz"
108
109			call nf95_open("coefoz_LMDZ.nc", nf90_nowrite, ncid)
110
111	guez	7	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	guez	3
116	guez	7	! 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	guez	3	! 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	guez	7	! Combine coefficients to get "c_Mob":
138			! (We use as few local variables as possible, in order to spare
139			! main memory.)
140	guez	3
141	guez	7	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	guez	9	c_mob = c_mob - a2 * coefoz
145	guez	7
146			call regr_pr_int_coefoz(ncid, "Sigma_Mob", julien, plev, top_value=0., &
147	guez	9	v3=coefoz)
148	guez	7	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	guez	3	! Heterogeneous chemistry is only at high latitudes:
155	guez	7	forall (k = 1: llm)
156			where (abs(rlat) <= 45.) r_het_interm(:, k) = 0.
157	guez	3	end forall
158	guez	7	where (r_het_interm /= 0.) r_het_interm = r_het_interm * (Clx / 3.8e-9)**2
159	guez	3
160	guez	7	deallocate(plev) ! pointer
161	guez	3	call nf95_close(ncid)
162
163	guez	7	end subroutine regr_pr_comb_coefoz
164	guez	3
165	guez	7	end module regr_pr_comb_coefoz_m