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 calcpar_gfs(n,uuh,vvh,pvh) |
---|
23 | ! i i i o |
---|
24 | !***************************************************************************** |
---|
25 | ! * |
---|
26 | ! Computation of several boundary layer parameters needed for the * |
---|
27 | ! dispersion calculation and calculation of dry deposition velocities. * |
---|
28 | ! All parameters are calculated over the entire grid. * |
---|
29 | ! * |
---|
30 | ! Author: A. Stohl * |
---|
31 | ! * |
---|
32 | ! 21 May 1995 * |
---|
33 | ! * |
---|
34 | ! ------------------------------------------------------------------ * |
---|
35 | ! Petra Seibert, Feb 2000: * |
---|
36 | ! convection scheme: * |
---|
37 | ! new variables in call to richardson * |
---|
38 | ! * |
---|
39 | !***************************************************************************** |
---|
40 | ! Changes, Bernd C. Krueger, Feb. 2001: |
---|
41 | ! Variables tth and qvh (on eta coordinates) in common block |
---|
42 | !***************************************************************************** |
---|
43 | ! * |
---|
44 | ! CHANGE 17/11/2005 Caroline Forster NCEP GFS version * |
---|
45 | ! * |
---|
46 | !***************************************************************************** |
---|
47 | ! Changes Arnold, D. and Morton, D. (2015): * |
---|
48 | ! -- description of local and common variables * |
---|
49 | !***************************************************************************** |
---|
50 | ! Functions: * |
---|
51 | ! scalev computation of ustar * |
---|
52 | ! obukhov computatio of Obukhov length * |
---|
53 | ! * |
---|
54 | !***************************************************************************** |
---|
55 | |
---|
56 | use par_mod |
---|
57 | use com_mod |
---|
58 | |
---|
59 | implicit none |
---|
60 | |
---|
61 | !*********************************************************************** |
---|
62 | ! Subroutine Parameters: * |
---|
63 | ! input * |
---|
64 | ! n temporal index for meteorological fields (1 to 3)* |
---|
65 | ! uuh,vvh, wwh wind components in ECMWF model levels * |
---|
66 | integer :: n |
---|
67 | real :: uuh(0:nxmax-1,0:nymax-1,nuvzmax) |
---|
68 | real :: vvh(0:nxmax-1,0:nymax-1,nuvzmax) |
---|
69 | real :: pvh(0:nxmax-1,0:nymax-1,nuvzmax) |
---|
70 | |
---|
71 | !*********************************************************************** |
---|
72 | ! Local variables * |
---|
73 | ! * |
---|
74 | ! ttlev |
---|
75 | ! qvlev |
---|
76 | ! * obukhov_gfs subroutine/function to calculate Obukhov length * |
---|
77 | ! * scalev subroutine/function to calculate ustar * |
---|
78 | ! ol obukhov length |
---|
79 | ! hmixplus maximum lifting from availiable kinetic enrgy * |
---|
80 | ! ulev, vlev wind speed at model levels * |
---|
81 | ! ew subroutine/function to calculate saturation * |
---|
82 | ! water vaport for a given air temperature * |
---|
83 | ! rh relative humidity at surface * |
---|
84 | ! vd deposition velocity from all species * |
---|
85 | ! subsceff excess hmin due to subgrid effects * |
---|
86 | ! ylat temporary latitude * |
---|
87 | ! altmin minimum height of the tropopause * |
---|
88 | ! tvoldm pold, zold temporary variables to keep previous values * |
---|
89 | ! pint pressure on model levels * |
---|
90 | ! tv virtual temperature on model levels * |
---|
91 | ! zlev height of model levels * |
---|
92 | |
---|
93 | real :: ttlev(nuvzmax),qvlev(nuvzmax),obukhov_gfs,scalev,ol,hmixplus |
---|
94 | real :: ulev(nuvzmax),vlev(nuvzmax),ew,rh,vd(maxspec),subsceff,ylat |
---|
95 | real :: altmin,tvold,pold,zold,pint,tv,zlev(nuvzmax),hmixdummy |
---|
96 | |
---|
97 | |
---|
98 | ! Other variables: |
---|
99 | ! ix,jy,kz,i,lz,kzmin loop control indices in each direction * |
---|
100 | integer :: ix,jy,i,kz,lz,kzmin,llev |
---|
101 | |
---|
102 | !*********************************************************************** |
---|
103 | |
---|
104 | !*********************************************************************** |
---|
105 | ! Local constants * |
---|
106 | real,parameter :: const=r_air/ga |
---|
107 | !*********************************************************************** |
---|
108 | |
---|
109 | |
---|
110 | !*********************************************************************** |
---|
111 | ! Global variables * |
---|
112 | ! from par_mod and com_mod * |
---|
113 | ! ustar [m/s] friction velocity * |
---|
114 | ! oli [m] inverse Obukhov length (1/L) * |
---|
115 | ! hmix [m] mixing height * |
---|
116 | ! wstar [m/s] convective velocity scale * |
---|
117 | ! ustar [m/s] friction velocity * |
---|
118 | ! z0 roughness length for the landuse classes * |
---|
119 | ! tropopause [m] altitude of thermal tropopause * |
---|
120 | ! nx, ny actual dimensions of wind fields in x and y direction * |
---|
121 | ! dx, dy grid distances in x,y direction * |
---|
122 | ! akm, bkm coefficients which regulate vertical discretization of ecmwf* |
---|
123 | ! akz, bkz model discretization coeffizients at the centre of layers * |
---|
124 | ! ps surface pressure * |
---|
125 | ! tt2 2-m temperature * |
---|
126 | ! tt2d 2-m dew temperature * |
---|
127 | ! sshf surface sensible heat flux * |
---|
128 | ! surfstr surface stress * |
---|
129 | ! convprec convective precip * |
---|
130 | ! lsprec large scale precip * |
---|
131 | ! sd snow depth * |
---|
132 | ! ssr surface solar radiation * |
---|
133 | ! xlon0, ylat0 geographical longitude/latitude of lower left grid point* |
---|
134 | ! |
---|
135 | !*********************************************************************** |
---|
136 | |
---|
137 | !----------------------------------------------------------------------------- |
---|
138 | |
---|
139 | |
---|
140 | ! Loop over entire grid |
---|
141 | !********************** |
---|
142 | |
---|
143 | do jy=0,nymin1 |
---|
144 | |
---|
145 | ! Set minimum height for tropopause |
---|
146 | !********************************** |
---|
147 | |
---|
148 | ylat=ylat0+real(jy)*dy |
---|
149 | if ((ylat.ge.-20.).and.(ylat.le.20.)) then |
---|
150 | altmin = 5000. |
---|
151 | else |
---|
152 | if ((ylat.gt.20.).and.(ylat.lt.40.)) then |
---|
153 | altmin=2500.+(40.-ylat)*125. |
---|
154 | else if ((ylat.gt.-40.).and.(ylat.lt.-20.)) then |
---|
155 | altmin=2500.+(40.+ylat)*125. |
---|
156 | else |
---|
157 | altmin=2500. |
---|
158 | endif |
---|
159 | endif |
---|
160 | |
---|
161 | do ix=0,nxmin1 |
---|
162 | |
---|
163 | ! 1) Calculation of friction velocity |
---|
164 | !************************************ |
---|
165 | |
---|
166 | ustar(ix,jy,1,n)=scalev(ps(ix,jy,1,n),tt2(ix,jy,1,n), & |
---|
167 | td2(ix,jy,1,n),surfstr(ix,jy,1,n)) |
---|
168 | if (ustar(ix,jy,1,n).le.1.e-8) ustar(ix,jy,1,n)=1.e-8 |
---|
169 | |
---|
170 | ! 2) Calculation of inverse Obukhov length scale |
---|
171 | !*********************************************** |
---|
172 | |
---|
173 | ! NCEP version: find first level above ground |
---|
174 | llev = 0 |
---|
175 | do i=1,nuvz |
---|
176 | if (ps(ix,jy,1,n).lt.akz(i)) llev=i |
---|
177 | end do |
---|
178 | llev = llev+1 |
---|
179 | if (llev.gt.nuvz) llev = nuvz-1 |
---|
180 | ! NCEP version |
---|
181 | |
---|
182 | ! calculate inverse Obukhov length scale with tth(llev) |
---|
183 | ol=obukhov_gfs(ps(ix,jy,1,n),tt2(ix,jy,1,n),td2(ix,jy,1,n), & |
---|
184 | tth(ix,jy,llev,n),ustar(ix,jy,1,n),sshf(ix,jy,1,n),akz(llev)) |
---|
185 | if (ol.ne.0.) then |
---|
186 | oli(ix,jy,1,n)=1./ol |
---|
187 | else |
---|
188 | oli(ix,jy,1,n)=99999. |
---|
189 | endif |
---|
190 | |
---|
191 | |
---|
192 | ! 3) Calculation of convective velocity scale and mixing height |
---|
193 | !************************************************************** |
---|
194 | |
---|
195 | do i=1,nuvz |
---|
196 | ulev(i)=uuh(ix,jy,i) |
---|
197 | vlev(i)=vvh(ix,jy,i) |
---|
198 | ttlev(i)=tth(ix,jy,i,n) |
---|
199 | qvlev(i)=qvh(ix,jy,i,n) |
---|
200 | end do |
---|
201 | |
---|
202 | ! NCEP version hmix has been read in in readwind.f, is therefore not calculated here |
---|
203 | call richardson_gfs(ps(ix,jy,1,n),ustar(ix,jy,1,n),ttlev,qvlev, & |
---|
204 | ulev,vlev,nuvz,akz,bkz,sshf(ix,jy,1,n),tt2(ix,jy,1,n), & |
---|
205 | td2(ix,jy,1,n),hmixdummy,wstar(ix,jy,1,n),hmixplus) |
---|
206 | |
---|
207 | if(lsubgrid.eq.1) then |
---|
208 | subsceff=min(excessoro(ix,jy),hmixplus) |
---|
209 | else |
---|
210 | subsceff=0 |
---|
211 | endif |
---|
212 | ! |
---|
213 | ! CALCULATE HMIX EXCESS ACCORDING TO SUBGRIDSCALE VARIABILITY AND STABILITY |
---|
214 | ! |
---|
215 | hmix(ix,jy,1,n)=hmix(ix,jy,1,n)+subsceff |
---|
216 | hmix(ix,jy,1,n)=max(hmixmin,hmix(ix,jy,1,n)) ! set minimum PBL height |
---|
217 | hmix(ix,jy,1,n)=min(hmixmax,hmix(ix,jy,1,n)) ! set maximum PBL height |
---|
218 | |
---|
219 | ! 4) Calculation of dry deposition velocities |
---|
220 | !******************************************** |
---|
221 | |
---|
222 | if (DRYDEP) then |
---|
223 | ! Sabine Eckhardt, Dec 06: use new index for z0 for water depending on |
---|
224 | ! windspeed |
---|
225 | z0(7)=0.016*ustar(ix,jy,1,n)*ustar(ix,jy,1,n)/ga |
---|
226 | |
---|
227 | ! Calculate relative humidity at surface |
---|
228 | !*************************************** |
---|
229 | rh=ew(td2(ix,jy,1,n))/ew(tt2(ix,jy,1,n)) |
---|
230 | |
---|
231 | call getvdep(n,ix,jy,ustar(ix,jy,1,n), & |
---|
232 | tt2(ix,jy,1,n),ps(ix,jy,1,n),1./oli(ix,jy,1,n), & |
---|
233 | ssr(ix,jy,1,n),rh,lsprec(ix,jy,1,n)+convprec(ix,jy,1,n), & |
---|
234 | sd(ix,jy,1,n),vd) |
---|
235 | |
---|
236 | do i=1,nspec |
---|
237 | vdep(ix,jy,i,n)=vd(i) |
---|
238 | end do |
---|
239 | |
---|
240 | endif |
---|
241 | |
---|
242 | !****************************************************** |
---|
243 | ! Calculate height of thermal tropopause (Hoinka, 1997) |
---|
244 | !****************************************************** |
---|
245 | |
---|
246 | ! 1) Calculate altitudes of NCEP model levels |
---|
247 | !********************************************* |
---|
248 | |
---|
249 | tvold=tt2(ix,jy,1,n)*(1.+0.378*ew(td2(ix,jy,1,n))/ & |
---|
250 | ps(ix,jy,1,n)) |
---|
251 | pold=ps(ix,jy,1,n) |
---|
252 | zold=0. |
---|
253 | do kz=llev,nuvz |
---|
254 | pint=akz(kz)+bkz(kz)*ps(ix,jy,1,n) ! pressure on model layers |
---|
255 | tv=tth(ix,jy,kz,n)*(1.+0.608*qvh(ix,jy,kz,n)) |
---|
256 | |
---|
257 | if (abs(tv-tvold).gt.0.2) then |
---|
258 | zlev(kz)=zold+const*log(pold/pint)*(tv-tvold)/log(tv/tvold) |
---|
259 | else |
---|
260 | zlev(kz)=zold+const*log(pold/pint)*tv |
---|
261 | endif |
---|
262 | tvold=tv |
---|
263 | pold=pint |
---|
264 | zold=zlev(kz) |
---|
265 | end do |
---|
266 | |
---|
267 | ! 2) Define a minimum level kzmin, from which upward the tropopause is |
---|
268 | ! searched for. This is to avoid inversions in the lower troposphere |
---|
269 | ! to be identified as the tropopause |
---|
270 | !************************************************************************ |
---|
271 | |
---|
272 | do kz=llev,nuvz |
---|
273 | if (zlev(kz).ge.altmin) then |
---|
274 | kzmin=kz |
---|
275 | goto 45 |
---|
276 | endif |
---|
277 | end do |
---|
278 | 45 continue |
---|
279 | |
---|
280 | ! 3) Search for first stable layer above minimum height that fulfills the |
---|
281 | ! thermal tropopause criterion |
---|
282 | !************************************************************************ |
---|
283 | |
---|
284 | do kz=kzmin,nuvz |
---|
285 | do lz=kz+1,nuvz |
---|
286 | if ((zlev(lz)-zlev(kz)).gt.2000.) then |
---|
287 | if (((tth(ix,jy,kz,n)-tth(ix,jy,lz,n))/ & |
---|
288 | (zlev(lz)-zlev(kz))).lt.0.002) then |
---|
289 | tropopause(ix,jy,1,n)=zlev(kz) |
---|
290 | goto 51 |
---|
291 | endif |
---|
292 | goto 50 |
---|
293 | endif |
---|
294 | end do |
---|
295 | 50 continue |
---|
296 | end do |
---|
297 | 51 continue |
---|
298 | |
---|
299 | |
---|
300 | end do |
---|
301 | end do |
---|
302 | |
---|
303 | |
---|
304 | ! Calculation of potential vorticity on 3-d grid |
---|
305 | !*********************************************** |
---|
306 | |
---|
307 | call calcpv(n,uuh,vvh,pvh) |
---|
308 | |
---|
309 | |
---|
310 | end subroutine calcpar_gfs |
---|