[4] | 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(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 | ! Variables: * |
---|
| 47 | ! n temporal index for meteorological fields (1 to 3) * |
---|
| 48 | ! * |
---|
| 49 | ! Constants: * |
---|
| 50 | ! * |
---|
| 51 | ! * |
---|
| 52 | ! Functions: * |
---|
| 53 | ! scalev computation of ustar * |
---|
| 54 | ! obukhov computatio of Obukhov length * |
---|
| 55 | ! * |
---|
| 56 | !***************************************************************************** |
---|
| 57 | |
---|
| 58 | use par_mod |
---|
| 59 | use com_mod |
---|
| 60 | |
---|
| 61 | implicit none |
---|
| 62 | |
---|
| 63 | integer :: n,ix,jy,i,kz,lz,kzmin,llev |
---|
| 64 | real :: ttlev(nuvzmax),qvlev(nuvzmax),obukhov,scalev,ol,hmixplus |
---|
| 65 | real :: ulev(nuvzmax),vlev(nuvzmax),ew,rh,vd(maxspec),subsceff,ylat |
---|
| 66 | real :: altmin,tvold,pold,zold,pint,tv,zlev(nuvzmax),hmixdummy |
---|
| 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 | real,parameter :: const=r_air/ga |
---|
| 71 | |
---|
| 72 | |
---|
| 73 | ! Loop over entire grid |
---|
| 74 | !********************** |
---|
| 75 | |
---|
| 76 | do jy=0,nymin1 |
---|
| 77 | |
---|
| 78 | ! Set minimum height for tropopause |
---|
| 79 | !********************************** |
---|
| 80 | |
---|
| 81 | ylat=ylat0+real(jy)*dy |
---|
| 82 | if ((ylat.ge.-20.).and.(ylat.le.20.)) then |
---|
| 83 | altmin = 5000. |
---|
| 84 | else |
---|
| 85 | if ((ylat.gt.20.).and.(ylat.lt.40.)) then |
---|
| 86 | altmin=2500.+(40.-ylat)*125. |
---|
| 87 | else if ((ylat.gt.-40.).and.(ylat.lt.-20.)) then |
---|
| 88 | altmin=2500.+(40.+ylat)*125. |
---|
| 89 | else |
---|
| 90 | altmin=2500. |
---|
| 91 | endif |
---|
| 92 | endif |
---|
| 93 | |
---|
| 94 | do ix=0,nxmin1 |
---|
| 95 | |
---|
| 96 | ! 1) Calculation of friction velocity |
---|
| 97 | !************************************ |
---|
| 98 | |
---|
| 99 | ustar(ix,jy,1,n)=scalev(ps(ix,jy,1,n),tt2(ix,jy,1,n), & |
---|
| 100 | td2(ix,jy,1,n),surfstr(ix,jy,1,n)) |
---|
| 101 | if (ustar(ix,jy,1,n).le.1.e-8) ustar(ix,jy,1,n)=1.e-8 |
---|
| 102 | |
---|
| 103 | ! 2) Calculation of inverse Obukhov length scale |
---|
| 104 | !*********************************************** |
---|
| 105 | |
---|
| 106 | ! NCEP version: find first level above ground |
---|
| 107 | llev = 0 |
---|
| 108 | do i=1,nuvz |
---|
| 109 | if (ps(ix,jy,1,n).lt.akz(i)) llev=i |
---|
| 110 | end do |
---|
| 111 | llev = llev+1 |
---|
| 112 | if (llev.gt.nuvz) llev = nuvz-1 |
---|
| 113 | ! NCEP version |
---|
| 114 | |
---|
| 115 | ! calculate inverse Obukhov length scale with tth(llev) |
---|
| 116 | ol=obukhov(ps(ix,jy,1,n),tt2(ix,jy,1,n),td2(ix,jy,1,n), & |
---|
| 117 | tth(ix,jy,llev,n),ustar(ix,jy,1,n),sshf(ix,jy,1,n),akz(llev)) |
---|
| 118 | if (ol.ne.0.) then |
---|
| 119 | oli(ix,jy,1,n)=1./ol |
---|
| 120 | else |
---|
| 121 | oli(ix,jy,1,n)=99999. |
---|
| 122 | endif |
---|
| 123 | |
---|
| 124 | |
---|
| 125 | ! 3) Calculation of convective velocity scale and mixing height |
---|
| 126 | !************************************************************** |
---|
| 127 | |
---|
| 128 | do i=1,nuvz |
---|
| 129 | ulev(i)=uuh(ix,jy,i) |
---|
| 130 | vlev(i)=vvh(ix,jy,i) |
---|
| 131 | ttlev(i)=tth(ix,jy,i,n) |
---|
| 132 | qvlev(i)=qvh(ix,jy,i,n) |
---|
| 133 | end do |
---|
| 134 | |
---|
| 135 | ! NCEP version hmix has been read in in readwind.f, is therefore not calculated here |
---|
| 136 | call richardson(ps(ix,jy,1,n),ustar(ix,jy,1,n),ttlev,qvlev, & |
---|
| 137 | ulev,vlev,nuvz,akz,bkz,sshf(ix,jy,1,n),tt2(ix,jy,1,n), & |
---|
| 138 | td2(ix,jy,1,n),hmixdummy,wstar(ix,jy,1,n),hmixplus) |
---|
| 139 | |
---|
| 140 | if(lsubgrid.eq.1) then |
---|
| 141 | subsceff=min(excessoro(ix,jy),hmixplus) |
---|
| 142 | else |
---|
| 143 | subsceff=0 |
---|
| 144 | endif |
---|
| 145 | ! |
---|
| 146 | ! CALCULATE HMIX EXCESS ACCORDING TO SUBGRIDSCALE VARIABILITY AND STABILITY |
---|
| 147 | ! |
---|
| 148 | hmix(ix,jy,1,n)=hmix(ix,jy,1,n)+subsceff |
---|
| 149 | hmix(ix,jy,1,n)=max(hmixmin,hmix(ix,jy,1,n)) ! set minimum PBL height |
---|
| 150 | hmix(ix,jy,1,n)=min(hmixmax,hmix(ix,jy,1,n)) ! set maximum PBL height |
---|
| 151 | |
---|
| 152 | ! 4) Calculation of dry deposition velocities |
---|
| 153 | !******************************************** |
---|
| 154 | |
---|
| 155 | if (DRYDEP) then |
---|
| 156 | ! Sabine Eckhardt, Dec 06: use new index for z0 for water depending on |
---|
| 157 | ! windspeed |
---|
| 158 | z0(7)=0.016*ustar(ix,jy,1,n)*ustar(ix,jy,1,n)/ga |
---|
| 159 | |
---|
| 160 | ! Calculate relative humidity at surface |
---|
| 161 | !*************************************** |
---|
| 162 | rh=ew(td2(ix,jy,1,n))/ew(tt2(ix,jy,1,n)) |
---|
| 163 | |
---|
| 164 | call getvdep(n,ix,jy,ustar(ix,jy,1,n), & |
---|
| 165 | tt2(ix,jy,1,n),ps(ix,jy,1,n),1./oli(ix,jy,1,n), & |
---|
| 166 | ssr(ix,jy,1,n),rh,lsprec(ix,jy,1,n)+convprec(ix,jy,1,n), & |
---|
| 167 | sd(ix,jy,1,n),vd) |
---|
| 168 | |
---|
| 169 | do i=1,nspec |
---|
| 170 | vdep(ix,jy,i,n)=vd(i) |
---|
| 171 | end do |
---|
| 172 | |
---|
| 173 | endif |
---|
| 174 | |
---|
| 175 | !****************************************************** |
---|
| 176 | ! Calculate height of thermal tropopause (Hoinka, 1997) |
---|
| 177 | !****************************************************** |
---|
| 178 | |
---|
| 179 | ! 1) Calculate altitudes of NCEP model levels |
---|
| 180 | !********************************************* |
---|
| 181 | |
---|
| 182 | tvold=tt2(ix,jy,1,n)*(1.+0.378*ew(td2(ix,jy,1,n))/ & |
---|
| 183 | ps(ix,jy,1,n)) |
---|
| 184 | pold=ps(ix,jy,1,n) |
---|
| 185 | zold=0. |
---|
| 186 | do kz=llev,nuvz |
---|
| 187 | pint=akz(kz)+bkz(kz)*ps(ix,jy,1,n) ! pressure on model layers |
---|
| 188 | tv=tth(ix,jy,kz,n)*(1.+0.608*qvh(ix,jy,kz,n)) |
---|
| 189 | |
---|
| 190 | if (abs(tv-tvold).gt.0.2) then |
---|
| 191 | zlev(kz)=zold+const*log(pold/pint)*(tv-tvold)/log(tv/tvold) |
---|
| 192 | else |
---|
| 193 | zlev(kz)=zold+const*log(pold/pint)*tv |
---|
| 194 | endif |
---|
| 195 | tvold=tv |
---|
| 196 | pold=pint |
---|
| 197 | zold=zlev(kz) |
---|
| 198 | end do |
---|
| 199 | |
---|
| 200 | ! 2) Define a minimum level kzmin, from which upward the tropopause is |
---|
| 201 | ! searched for. This is to avoid inversions in the lower troposphere |
---|
| 202 | ! to be identified as the tropopause |
---|
| 203 | !************************************************************************ |
---|
| 204 | |
---|
| 205 | do kz=llev,nuvz |
---|
| 206 | if (zlev(kz).ge.altmin) then |
---|
| 207 | kzmin=kz |
---|
| 208 | goto 45 |
---|
| 209 | endif |
---|
| 210 | end do |
---|
| 211 | 45 continue |
---|
| 212 | |
---|
| 213 | ! 3) Search for first stable layer above minimum height that fulfills the |
---|
| 214 | ! thermal tropopause criterion |
---|
| 215 | !************************************************************************ |
---|
| 216 | |
---|
| 217 | do kz=kzmin,nuvz |
---|
| 218 | do lz=kz+1,nuvz |
---|
| 219 | if ((zlev(lz)-zlev(kz)).gt.2000.) then |
---|
| 220 | if (((tth(ix,jy,kz,n)-tth(ix,jy,lz,n))/ & |
---|
| 221 | (zlev(lz)-zlev(kz))).lt.0.002) then |
---|
| 222 | tropopause(ix,jy,1,n)=zlev(kz) |
---|
| 223 | goto 51 |
---|
| 224 | endif |
---|
| 225 | goto 50 |
---|
| 226 | endif |
---|
| 227 | end do |
---|
| 228 | 50 continue |
---|
| 229 | end do |
---|
| 230 | 51 continue |
---|
| 231 | |
---|
| 232 | |
---|
| 233 | end do |
---|
| 234 | end do |
---|
| 235 | |
---|
| 236 | |
---|
| 237 | ! Calculation of potential vorticity on 3-d grid |
---|
| 238 | !*********************************************** |
---|
| 239 | |
---|
| 240 | call calcpv(n,uuh,vvh,pvh) |
---|
| 241 | |
---|
| 242 | |
---|
| 243 | end subroutine calcpar |
---|