1 | !********************************************************************** |
---|
2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
---|
3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
---|
4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
---|
5 | ! * |
---|
6 | ! This file is part of FLEXPART. * |
---|
7 | ! * |
---|
8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
---|
9 | ! it under the terms of the GNU General Public License as published by* |
---|
10 | ! the Free Software Foundation, either version 3 of the License, or * |
---|
11 | ! (at your option) any later version. * |
---|
12 | ! * |
---|
13 | ! FLEXPART is distributed in the hope that it will be useful, * |
---|
14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
---|
15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
---|
16 | ! GNU General Public License for more details. * |
---|
17 | ! * |
---|
18 | ! You should have received a copy of the GNU General Public License * |
---|
19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
---|
20 | !********************************************************************** |
---|
21 | |
---|
22 | subroutine getrc(nc,i,j,t,gr,rh,rr,rc) |
---|
23 | ! i i i i i i i o |
---|
24 | !***************************************************************************** |
---|
25 | ! * |
---|
26 | ! Calculation of the surface resistance according to the procedure given * |
---|
27 | ! in: * |
---|
28 | ! Wesely (1989): Parameterization of surface resistances to gaseous * |
---|
29 | ! dry deposition in regional-scale numerical models. * |
---|
30 | ! Atmos. Environ. 23, 1293-1304. * |
---|
31 | ! * |
---|
32 | ! * |
---|
33 | ! AUTHOR: Andreas Stohl, 19 May 1995 * |
---|
34 | ! * |
---|
35 | !***************************************************************************** |
---|
36 | ! * |
---|
37 | ! Variables: * |
---|
38 | ! * |
---|
39 | ! reldiff(maxspec) diffusivity of H2O/diffusivity of component i * |
---|
40 | ! gr [W/m2] global radiation * |
---|
41 | ! i index of seasonal category * |
---|
42 | ! j index of landuse class * |
---|
43 | ! ldep(maxspec) 1, if deposition shall be calculated for species i * |
---|
44 | ! nc actual number of chemical components * |
---|
45 | ! rcl(maxspec,5,8) [s/m] Lower canopy resistance * |
---|
46 | ! rgs(maxspec,5,8) [s/m] Ground resistance * |
---|
47 | ! rlu(maxspec,5,8) [s/m] Leaf cuticular resistance * |
---|
48 | ! rm(maxspec) [s/m] Mesophyll resistance * |
---|
49 | ! t [C] temperature * |
---|
50 | ! * |
---|
51 | !***************************************************************************** |
---|
52 | |
---|
53 | use par_mod |
---|
54 | use com_mod |
---|
55 | |
---|
56 | implicit none |
---|
57 | |
---|
58 | integer :: i,j,ic,nc |
---|
59 | real :: gr,rh,rr,t,rs,rsm,corr,rluc,rclc,rgsc,rdc,rluo |
---|
60 | real :: rc(maxspec) |
---|
61 | |
---|
62 | |
---|
63 | ! Compute stomatal resistance |
---|
64 | !**************************** |
---|
65 | ! Sabine Eckhardt, Dec 06: use 1E25 instead of 99999. for infinite res. |
---|
66 | |
---|
67 | if ((t.gt.0.).and.(t.lt.40.)) then |
---|
68 | rs=ri(i,j)*(1.+(200./(gr+0.1))**2)*(400./(t*(40.-t))) |
---|
69 | else |
---|
70 | rs=1.E25 |
---|
71 | ! rs=99999. |
---|
72 | endif |
---|
73 | |
---|
74 | |
---|
75 | ! Correct stomatal resistance for effect of dew and rain |
---|
76 | !******************************************************* |
---|
77 | |
---|
78 | if ((rh.gt.0.9).or.(rr.gt.0.)) rs=rs*3. |
---|
79 | |
---|
80 | ! Compute the lower canopy resistance |
---|
81 | !************************************ |
---|
82 | |
---|
83 | rdc=100.*(1.+1000./(gr+10.)) |
---|
84 | |
---|
85 | |
---|
86 | corr=1000.*exp(-1.*t-4.) |
---|
87 | do ic=1,nc |
---|
88 | if (reldiff(ic).gt.0.) then |
---|
89 | |
---|
90 | ! Compute combined stomatal and mesophyll resistance |
---|
91 | !*************************************************** |
---|
92 | |
---|
93 | rsm=rs*reldiff(ic)+rm(ic) |
---|
94 | |
---|
95 | ! Correct leaf cuticular, lower canopy and ground resistance |
---|
96 | !*********************************************************** |
---|
97 | |
---|
98 | rluc=rlu(ic,i,j)+corr |
---|
99 | rclc=rcl(ic,i,j)+corr |
---|
100 | rgsc=rgs(ic,i,j)+corr |
---|
101 | |
---|
102 | ! Correct leaf cuticular resistance for effect of dew and rain |
---|
103 | !************************************************************* |
---|
104 | |
---|
105 | if (rr.gt.0.) then |
---|
106 | rluo=1./(1./1000.+1./(3.*rluc)) |
---|
107 | rluc=1./(1./(3.*rluc)+1.e-7*henry(ic)+f0(ic)/rluo) |
---|
108 | else if (rh.gt.0.9) then |
---|
109 | rluo=1./(1./3000.+1./(3.*rluc)) |
---|
110 | rluc=1./(1./(3.*rluc)+1.e-7*henry(ic)+f0(ic)/rluo) |
---|
111 | endif |
---|
112 | |
---|
113 | ! Combine resistances to give total resistance |
---|
114 | !********************************************* |
---|
115 | |
---|
116 | rc(ic)=1./(1./rsm+1./rluc+1./(rdc+rclc)+1./(rac(i,j)+rgsc)) |
---|
117 | ! Sabine Eckhardt, Dec 06: avoid possible excessively high vdep |
---|
118 | if (rc(ic).lt.10.) rc(ic)=10. |
---|
119 | endif |
---|
120 | end do |
---|
121 | |
---|
122 | end subroutine getrc |
---|