[e200b7a] | 1 | !********************************************************************** |
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| 2 | ! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 * |
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| 3 | ! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, * |
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| 4 | ! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann * |
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| 5 | ! * |
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| 6 | ! This file is part of FLEXPART. * |
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| 7 | ! * |
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| 8 | ! FLEXPART is free software: you can redistribute it and/or modify * |
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| 9 | ! it under the terms of the GNU General Public License as published by* |
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| 10 | ! the Free Software Foundation, either version 3 of the License, or * |
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| 11 | ! (at your option) any later version. * |
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| 12 | ! * |
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| 13 | ! FLEXPART is distributed in the hope that it will be useful, * |
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| 14 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 15 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 16 | ! GNU General Public License for more details. * |
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| 17 | ! * |
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| 18 | ! You should have received a copy of the GNU General Public License * |
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| 19 | ! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. * |
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| 20 | !********************************************************************** |
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| 21 | |
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[496c607] | 22 | subroutine calcpar_gfs(n,uuh,vvh,pvh) |
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[e200b7a] | 23 | ! i i i o |
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| 24 | !***************************************************************************** |
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| 25 | ! * |
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| 26 | ! Computation of several boundary layer parameters needed for the * |
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| 27 | ! dispersion calculation and calculation of dry deposition velocities. * |
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| 28 | ! All parameters are calculated over the entire grid. * |
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| 29 | ! * |
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| 30 | ! Author: A. Stohl * |
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| 31 | ! * |
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| 32 | ! 21 May 1995 * |
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| 33 | ! * |
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| 34 | ! ------------------------------------------------------------------ * |
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| 35 | ! Petra Seibert, Feb 2000: * |
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| 36 | ! convection scheme: * |
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| 37 | ! new variables in call to richardson * |
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| 38 | ! * |
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| 39 | !***************************************************************************** |
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| 40 | ! Changes, Bernd C. Krueger, Feb. 2001: |
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| 41 | ! Variables tth and qvh (on eta coordinates) in common block |
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| 42 | !***************************************************************************** |
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| 43 | ! * |
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| 44 | ! CHANGE 17/11/2005 Caroline Forster NCEP GFS version * |
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| 45 | ! * |
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[496c607] | 46 | !***************************************************************************** |
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| 47 | ! Changes Arnold, D. and Morton, D. (2015): * |
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| 48 | ! -- description of local and common variables * |
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| 49 | !***************************************************************************** |
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[e200b7a] | 50 | ! Functions: * |
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| 51 | ! scalev computation of ustar * |
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| 52 | ! obukhov computatio of Obukhov length * |
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| 53 | ! * |
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| 54 | !***************************************************************************** |
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| 55 | |
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| 56 | use par_mod |
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| 57 | use com_mod |
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| 58 | |
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| 59 | implicit none |
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| 60 | |
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[496c607] | 61 | !*********************************************************************** |
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| 62 | ! Subroutine Parameters: * |
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| 63 | ! input * |
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| 64 | ! n temporal index for meteorological fields (1 to 3)* |
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| 65 | ! uuh,vvh, wwh wind components in ECMWF model levels * |
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| 66 | integer :: n |
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[e200b7a] | 67 | real :: uuh(0:nxmax-1,0:nymax-1,nuvzmax) |
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| 68 | real :: vvh(0:nxmax-1,0:nymax-1,nuvzmax) |
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| 69 | real :: pvh(0:nxmax-1,0:nymax-1,nuvzmax) |
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[496c607] | 70 | |
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| 71 | !*********************************************************************** |
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| 72 | ! Local variables * |
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| 73 | ! * |
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| 74 | ! ttlev |
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| 75 | ! qvlev |
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| 76 | ! * obukhov_gfs subroutine/function to calculate Obukhov length * |
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| 77 | ! * scalev subroutine/function to calculate ustar * |
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| 78 | ! ol obukhov length |
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| 79 | ! hmixplus maximum lifting from availiable kinetic enrgy * |
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| 80 | ! ulev, vlev wind speed at model levels * |
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| 81 | ! ew subroutine/function to calculate saturation * |
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| 82 | ! water vaport for a given air temperature * |
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| 83 | ! rh relative humidity at surface * |
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| 84 | ! vd deposition velocity from all species * |
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| 85 | ! subsceff excess hmin due to subgrid effects * |
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| 86 | ! ylat temporary latitude * |
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| 87 | ! altmin minimum height of the tropopause * |
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| 88 | ! tvoldm pold, zold temporary variables to keep previous values * |
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| 89 | ! pint pressure on model levels * |
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| 90 | ! tv virtual temperature on model levels * |
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| 91 | ! zlev height of model levels * |
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| 92 | |
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| 93 | real :: ttlev(nuvzmax),qvlev(nuvzmax),obukhov_gfs,scalev,ol,hmixplus |
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| 94 | real :: ulev(nuvzmax),vlev(nuvzmax),ew,rh,vd(maxspec),subsceff,ylat |
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| 95 | real :: altmin,tvold,pold,zold,pint,tv,zlev(nuvzmax),hmixdummy |
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| 96 | |
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| 97 | |
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| 98 | ! Other variables: |
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| 99 | ! ix,jy,kz,i,lz,kzmin loop control indices in each direction * |
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| 100 | integer :: ix,jy,i,kz,lz,kzmin,llev |
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| 101 | |
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| 102 | !*********************************************************************** |
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| 103 | |
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| 104 | !*********************************************************************** |
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| 105 | ! Local constants * |
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[e200b7a] | 106 | real,parameter :: const=r_air/ga |
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[496c607] | 107 | !*********************************************************************** |
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| 108 | |
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| 109 | |
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| 110 | !*********************************************************************** |
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| 111 | ! Global variables * |
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| 112 | ! from par_mod and com_mod * |
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| 113 | ! ustar [m/s] friction velocity * |
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| 114 | ! oli [m] inverse Obukhov length (1/L) * |
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| 115 | ! hmix [m] mixing height * |
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| 116 | ! wstar [m/s] convective velocity scale * |
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| 117 | ! ustar [m/s] friction velocity * |
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| 118 | ! z0 roughness length for the landuse classes * |
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| 119 | ! tropopause [m] altitude of thermal tropopause * |
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| 120 | ! nx, ny actual dimensions of wind fields in x and y direction * |
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| 121 | ! dx, dy grid distances in x,y direction * |
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| 122 | ! akm, bkm coefficients which regulate vertical discretization of ecmwf* |
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| 123 | ! akz, bkz model discretization coeffizients at the centre of layers * |
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| 124 | ! ps surface pressure * |
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| 125 | ! tt2 2-m temperature * |
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| 126 | ! tt2d 2-m dew temperature * |
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| 127 | ! sshf surface sensible heat flux * |
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| 128 | ! surfstr surface stress * |
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| 129 | ! convprec convective precip * |
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| 130 | ! lsprec large scale precip * |
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| 131 | ! sd snow depth * |
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| 132 | ! ssr surface solar radiation * |
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| 133 | ! xlon0, ylat0 geographical longitude/latitude of lower left grid point* |
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| 134 | ! |
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| 135 | !*********************************************************************** |
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| 136 | |
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| 137 | !----------------------------------------------------------------------------- |
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[e200b7a] | 138 | |
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| 139 | |
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| 140 | ! Loop over entire grid |
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| 141 | !********************** |
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| 142 | |
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| 143 | do jy=0,nymin1 |
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| 144 | |
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| 145 | ! Set minimum height for tropopause |
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| 146 | !********************************** |
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| 147 | |
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| 148 | ylat=ylat0+real(jy)*dy |
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| 149 | if ((ylat.ge.-20.).and.(ylat.le.20.)) then |
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| 150 | altmin = 5000. |
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| 151 | else |
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| 152 | if ((ylat.gt.20.).and.(ylat.lt.40.)) then |
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| 153 | altmin=2500.+(40.-ylat)*125. |
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| 154 | else if ((ylat.gt.-40.).and.(ylat.lt.-20.)) then |
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| 155 | altmin=2500.+(40.+ylat)*125. |
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| 156 | else |
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| 157 | altmin=2500. |
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| 158 | endif |
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| 159 | endif |
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| 160 | |
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| 161 | do ix=0,nxmin1 |
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| 162 | |
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| 163 | ! 1) Calculation of friction velocity |
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| 164 | !************************************ |
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| 165 | |
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| 166 | ustar(ix,jy,1,n)=scalev(ps(ix,jy,1,n),tt2(ix,jy,1,n), & |
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| 167 | td2(ix,jy,1,n),surfstr(ix,jy,1,n)) |
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| 168 | if (ustar(ix,jy,1,n).le.1.e-8) ustar(ix,jy,1,n)=1.e-8 |
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| 169 | |
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| 170 | ! 2) Calculation of inverse Obukhov length scale |
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| 171 | !*********************************************** |
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| 172 | |
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| 173 | ! NCEP version: find first level above ground |
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| 174 | llev = 0 |
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| 175 | do i=1,nuvz |
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| 176 | if (ps(ix,jy,1,n).lt.akz(i)) llev=i |
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| 177 | end do |
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| 178 | llev = llev+1 |
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| 179 | if (llev.gt.nuvz) llev = nuvz-1 |
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| 180 | ! NCEP version |
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| 181 | |
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| 182 | ! calculate inverse Obukhov length scale with tth(llev) |
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[496c607] | 183 | ol=obukhov_gfs(ps(ix,jy,1,n),tt2(ix,jy,1,n),td2(ix,jy,1,n), & |
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[e200b7a] | 184 | tth(ix,jy,llev,n),ustar(ix,jy,1,n),sshf(ix,jy,1,n),akz(llev)) |
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| 185 | if (ol.ne.0.) then |
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| 186 | oli(ix,jy,1,n)=1./ol |
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| 187 | else |
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| 188 | oli(ix,jy,1,n)=99999. |
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| 189 | endif |
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| 190 | |
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| 191 | |
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| 192 | ! 3) Calculation of convective velocity scale and mixing height |
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| 193 | !************************************************************** |
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| 194 | |
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| 195 | do i=1,nuvz |
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| 196 | ulev(i)=uuh(ix,jy,i) |
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| 197 | vlev(i)=vvh(ix,jy,i) |
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| 198 | ttlev(i)=tth(ix,jy,i,n) |
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| 199 | qvlev(i)=qvh(ix,jy,i,n) |
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| 200 | end do |
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| 201 | |
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| 202 | ! NCEP version hmix has been read in in readwind.f, is therefore not calculated here |
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[496c607] | 203 | call richardson_gfs(ps(ix,jy,1,n),ustar(ix,jy,1,n),ttlev,qvlev, & |
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[e200b7a] | 204 | ulev,vlev,nuvz,akz,bkz,sshf(ix,jy,1,n),tt2(ix,jy,1,n), & |
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| 205 | td2(ix,jy,1,n),hmixdummy,wstar(ix,jy,1,n),hmixplus) |
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| 206 | |
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| 207 | if(lsubgrid.eq.1) then |
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| 208 | subsceff=min(excessoro(ix,jy),hmixplus) |
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| 209 | else |
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| 210 | subsceff=0 |
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| 211 | endif |
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| 212 | ! |
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| 213 | ! CALCULATE HMIX EXCESS ACCORDING TO SUBGRIDSCALE VARIABILITY AND STABILITY |
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| 214 | ! |
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| 215 | hmix(ix,jy,1,n)=hmix(ix,jy,1,n)+subsceff |
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| 216 | hmix(ix,jy,1,n)=max(hmixmin,hmix(ix,jy,1,n)) ! set minimum PBL height |
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| 217 | hmix(ix,jy,1,n)=min(hmixmax,hmix(ix,jy,1,n)) ! set maximum PBL height |
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| 218 | |
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| 219 | ! 4) Calculation of dry deposition velocities |
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| 220 | !******************************************** |
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| 221 | |
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| 222 | if (DRYDEP) then |
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| 223 | ! Sabine Eckhardt, Dec 06: use new index for z0 for water depending on |
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| 224 | ! windspeed |
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| 225 | z0(7)=0.016*ustar(ix,jy,1,n)*ustar(ix,jy,1,n)/ga |
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| 226 | |
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| 227 | ! Calculate relative humidity at surface |
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| 228 | !*************************************** |
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| 229 | rh=ew(td2(ix,jy,1,n))/ew(tt2(ix,jy,1,n)) |
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| 230 | |
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| 231 | call getvdep(n,ix,jy,ustar(ix,jy,1,n), & |
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| 232 | tt2(ix,jy,1,n),ps(ix,jy,1,n),1./oli(ix,jy,1,n), & |
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| 233 | ssr(ix,jy,1,n),rh,lsprec(ix,jy,1,n)+convprec(ix,jy,1,n), & |
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| 234 | sd(ix,jy,1,n),vd) |
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| 235 | |
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| 236 | do i=1,nspec |
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| 237 | vdep(ix,jy,i,n)=vd(i) |
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| 238 | end do |
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| 239 | |
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| 240 | endif |
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| 241 | |
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| 242 | !****************************************************** |
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| 243 | ! Calculate height of thermal tropopause (Hoinka, 1997) |
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| 244 | !****************************************************** |
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| 245 | |
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| 246 | ! 1) Calculate altitudes of NCEP model levels |
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| 247 | !********************************************* |
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| 248 | |
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| 249 | tvold=tt2(ix,jy,1,n)*(1.+0.378*ew(td2(ix,jy,1,n))/ & |
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| 250 | ps(ix,jy,1,n)) |
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| 251 | pold=ps(ix,jy,1,n) |
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| 252 | zold=0. |
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| 253 | do kz=llev,nuvz |
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| 254 | pint=akz(kz)+bkz(kz)*ps(ix,jy,1,n) ! pressure on model layers |
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| 255 | tv=tth(ix,jy,kz,n)*(1.+0.608*qvh(ix,jy,kz,n)) |
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| 256 | |
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| 257 | if (abs(tv-tvold).gt.0.2) then |
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| 258 | zlev(kz)=zold+const*log(pold/pint)*(tv-tvold)/log(tv/tvold) |
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| 259 | else |
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| 260 | zlev(kz)=zold+const*log(pold/pint)*tv |
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| 261 | endif |
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| 262 | tvold=tv |
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| 263 | pold=pint |
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| 264 | zold=zlev(kz) |
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| 265 | end do |
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| 266 | |
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| 267 | ! 2) Define a minimum level kzmin, from which upward the tropopause is |
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| 268 | ! searched for. This is to avoid inversions in the lower troposphere |
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| 269 | ! to be identified as the tropopause |
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| 270 | !************************************************************************ |
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| 271 | |
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| 272 | do kz=llev,nuvz |
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| 273 | if (zlev(kz).ge.altmin) then |
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| 274 | kzmin=kz |
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| 275 | goto 45 |
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| 276 | endif |
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| 277 | end do |
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| 278 | 45 continue |
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| 279 | |
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| 280 | ! 3) Search for first stable layer above minimum height that fulfills the |
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| 281 | ! thermal tropopause criterion |
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| 282 | !************************************************************************ |
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| 283 | |
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| 284 | do kz=kzmin,nuvz |
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| 285 | do lz=kz+1,nuvz |
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| 286 | if ((zlev(lz)-zlev(kz)).gt.2000.) then |
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| 287 | if (((tth(ix,jy,kz,n)-tth(ix,jy,lz,n))/ & |
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| 288 | (zlev(lz)-zlev(kz))).lt.0.002) then |
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| 289 | tropopause(ix,jy,1,n)=zlev(kz) |
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| 290 | goto 51 |
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| 291 | endif |
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| 292 | goto 50 |
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| 293 | endif |
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| 294 | end do |
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| 295 | 50 continue |
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| 296 | end do |
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| 297 | 51 continue |
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| 298 | |
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| 299 | |
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| 300 | end do |
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| 301 | end do |
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| 302 | |
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| 303 | |
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| 304 | ! Calculation of potential vorticity on 3-d grid |
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| 305 | !*********************************************** |
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| 306 | |
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| 307 | call calcpv(n,uuh,vvh,pvh) |
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| 308 | |
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| 309 | |
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[496c607] | 310 | end subroutine calcpar_gfs |
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