/[lmdze]/trunk/Sources/phylmd/Mobidic/o3_chem.f
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trunk/libf/phylmd/o3_chem_m.f90 revision 3 by guez, Wed Feb 27 13:16:39 2008 UTC trunk/libf/phylmd/Mobidic/o3_chem.f90 revision 36 by guez, Thu Dec 2 17:11:04 2010 UTC
# Line 13  contains Line 13  contains
13      ! This procedure evolves the ozone mass fraction through a time      ! This procedure evolves the ozone mass fraction through a time
14      ! step taking only chemistry into account.      ! step taking only chemistry into account.
15    
16      use nrutil, only: assert      ! All the 2-dimensional arrays are on the "physics" grid.
17        ! Their shape is "(/klon, llm/)".
18        ! Index "(i, :)" is for longitude "rlon(i)", latitude "rlat(i)".
19    
20        use nr_util, only: assert, pi
21      use dimphy, only: klon      use dimphy, only: klon
22      use dimens_m, only: llm      use dimens_m, only: llm
23      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
24      use orbite_m, only: orbite, zenang      use orbite_m, only: orbite, zenang
     use nrtype, only: pi  
25    
26      integer, intent(in):: julien ! jour julien, 1 <= julien <= 360      integer, intent(in):: julien ! jour julien, 1 <= julien <= 360
27      real, intent(in):: gmtime ! heure de la journée en fraction de jour      real, intent(in):: gmtime ! heure de la journée en fraction de jour
28      real, intent(in):: t_seri(:, :) ! temperature,  in K      real, intent(in):: t_seri(:, :) ! (klon, llm) temperature, in K
29    
30      real, intent(in):: zmasse(:, :)      real, intent(in):: zmasse(:, :) ! (klon, llm)
31      ! (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)
32      ! (On the "physics" grid.      ! "zmasse(:, k)" is for layer "k".)
     ! "zmasse(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", for  
     ! layer "k".)  
33    
34      real, intent(in):: pdtphys ! time step for physics, in s      real, intent(in):: pdtphys ! time step for physics, in s
35    
36      real, intent(inout):: q(:, :) ! mass fraction of ozone      real, intent(inout):: q(:, :) ! (klon, llm) mass fraction of ozone
37      ! (On the "physics" grid.      ! "q(:, k)" is at middle of layer "k".)
     ! "q(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of  
     ! layer "k".)  
38    
39      ! Variables local to the procedure:      ! Variables local to the procedure:
40      integer month, k      integer k
41    
42      real c(klon, llm)      real c(klon, llm)
43      ! (constant term during a time step in the net mass production      ! (constant term during a time step in the net mass production
44      ! 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)
45      ! (On the "physics" grid.      ! "c(:, k)" is at middle of layer "k".)
     ! "c(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of  
     ! layer "k".)  
46    
47      real b(klon, llm)      real b(klon, llm)
48      ! (coefficient of "q" in the net mass production      ! (coefficient of "q" in the net mass production
49      ! 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)
50      ! (On the "physics" grid.      ! "b(:, k)" is at middle of layer "k".)
     ! "b(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of  
     ! layer "k".)  
51    
52      real dq_o3_chem(klon, llm)      real dq_o3_chem(klon, llm)
53      ! (variation of ozone mass fraction due to chemistry during a time step)      ! (variation of ozone mass fraction due to chemistry during a time step)
54      ! (On the "physics" grid.      ! "dq_o3_chem(:, k)" is at middle of layer "k".)
     ! "dq_o3_chem(i, k)" is at longitude "rlon(i)", latitude  
     ! "rlat(i)", middle of layer "k".)  
55    
56      real earth_long      real earth_long
57      ! (longitude vraie de la Terre dans son orbite solaire, par      ! (longitude vraie de la Terre dans son orbite solaire, par
# Line 73  contains Line 66  contains
66      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)/), &
67           "o3_chem llm")           "o3_chem llm")
68    
69      month = (julien - 1) / 30 + 1 ! compute the month from the day number      c = c_Mob + a4_mass * t_seri
     c = c_Mob(:, :, month) + a4_mass(:, :, month) * t_seri  
70    
71      ! Compute coefficient "b":      ! Compute coefficient "b":
72    
73      ! Heterogeneous chemistry is only at low temperature:      ! Heterogeneous chemistry is only at low temperature:
74      where (t_seri < 195.)      where (t_seri < 195.)
75         b = r_het_interm(:, :, month)         b = r_het_interm
76      elsewhere      elsewhere
77         b = 0.         b = 0.
78      end where      end where
# Line 92  contains Line 84  contains
84         where (pmu0 <= cos(87. / 180. * pi)) b(:, k) = 0.         where (pmu0 <= cos(87. / 180. * pi)) b(:, k) = 0.
85      end forall      end forall
86    
87      b = b + a2(:, :, month)      b = b + a2
88    
89      ! Midpoint method:      ! Midpoint method:
90    
91      ! Trial step to the midpoint:      ! Trial step to the midpoint:
92      dq_o3_chem = o3_prod(q, month, zmasse, c, b) * pdtphys  / 2      dq_o3_chem = o3_prod(q, zmasse, c, b) * pdtphys  / 2
93      ! "Real" step across the whole interval:      ! "Real" step across the whole interval:
94      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
95      q = q + dq_o3_chem      q = q + dq_o3_chem
96    
97      ! Confine the mass fraction:      ! Confine the mass fraction:
# Line 109  contains Line 101  contains
101    
102    !*************************************************    !*************************************************
103    
104    function o3_prod(q, month, zmasse, c, b)    function o3_prod(q, zmasse, c, b)
105    
106      ! This function computes the production rate of ozone by chemistry.      ! This function computes the production rate of ozone by chemistry.
107    
108      use read_coefoz_m, only: a6_mass      ! All the 2-dimensional arrays are on the "physics" grid.
109      use nrutil, only: assert      ! Their shape is "(/klon, llm/)".
110        ! Index "(i, :)" is for longitude "rlon(i)", latitude "rlat(i)".
111    
112        use regr_pr_comb_coefoz_m, only: a6_mass
113        use nr_util, only: assert
114      use dimens_m, only: llm      use dimens_m, only: llm
115      use dimphy, only: klon      use dimphy, only: klon
116    
117      real, intent(in):: q(:, :) ! mass fraction of ozone      real, intent(in):: q(:, :) ! mass fraction of ozone
118      ! (On the "physics" grid.      ! "q(:, k)" is at middle of layer "k".)
     ! "q(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of  
     ! layer "k".)  
   
     integer, intent(in):: month  
119    
120      real, intent(in):: zmasse(:, :)      real, intent(in):: zmasse(:, :)
121      ! (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)
122      ! (On the "physics" grid.      ! ("zmasse(:, k)" is for layer "k".)
     ! "zmasse(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of  
     ! layer "k".)  
123    
124      real, intent(in):: c(:, :)      real, intent(in):: c(:, :)
125      ! (constant term during a time step in the net mass production      ! (constant term during a time step in the net mass production
126      ! 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)
127      ! (On the "physics" grid.      ! "c(:, k)" is at middle of layer "k".)
     ! "c(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of  
     ! layer "k".)  
128    
129      real, intent(in):: b(:, :)      real, intent(in):: b(:, :)
130      ! (coefficient of "q" in the net mass production      ! (coefficient of "q" in the net mass production rate of ozone by
131      ! rate of ozone by chemistry, per unit mass of air, in s-1)      ! chemistry, per unit mass of air, in s-1)
132      ! (On the "physics" grid.      ! ("b(:, k)" is at middle of layer "k".)
     ! "b(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of  
     ! layer "k".)  
133    
134      real o3_prod(klon, llm)      real o3_prod(klon, llm)
135      ! (net mass production rate of ozone by chemistry, per unit mass      ! (net mass production rate of ozone by chemistry, per unit mass
136      ! of air, in s-1)      ! of air, in s-1)
137      ! (On the "physics" grid.      ! ("o3_prod(:, k)" is at middle of layer "k".)
     ! "o3_prod(i, k)" is at longitude "rlon(i)", latitude "rlat(i)", middle of  
     ! layer "k".)  
138    
139      ! Variables local to the procedure:      ! Variables local to the procedure:
140    
141      real sigma_mass(klon, llm)      real sigma_mass(klon, llm)
142      ! (mass column-density of ozone above point, in kg m-2)      ! (mass column-density of ozone above point, in kg m-2)
143      ! (On the "physics" grid.      ! ("sigma_mass(:, k)" is at middle of layer "k".)
     ! "sigma_mass(i, k)" is at longitude "rlon(i)", latitude  
     ! "rlat(i)", middle of layer "k".)  
144    
145      integer k      integer k
146    
# Line 177  contains Line 159  contains
159         sigma_mass(:, k) = sigma_mass(:, k+1) + zmasse(:, k) * q(:, k)         sigma_mass(:, k) = sigma_mass(:, k+1) + zmasse(:, k) * q(:, k)
160      end do      end do
161    
162      o3_prod = c + b * q + a6_mass(:, :, month) * sigma_mass      o3_prod = c + b * q + a6_mass * sigma_mass
163    
164    end function o3_prod    end function o3_prod
165    
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