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|
!**********************************************************************
! Copyright 1998,1999,2000,2001,2002,2005,2007,2008,2009,2010 *
! Andreas Stohl, Petra Seibert, A. Frank, Gerhard Wotawa, *
! Caroline Forster, Sabine Eckhardt, John Burkhart, Harald Sodemann *
! *
! This file is part of FLEXPART. *
! *
! FLEXPART is free software: you can redistribute it and/or modify *
! it under the terms of the GNU General Public License as published by*
! the Free Software Foundation, either version 3 of the License, or *
! (at your option) any later version. *
! *
! FLEXPART is distributed in the hope that it will be useful, *
! but WITHOUT ANY WARRANTY; without even the implied warranty of *
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
! GNU General Public License for more details. *
! *
! You should have received a copy of the GNU General Public License *
! along with FLEXPART. If not, see <http://www.gnu.org/licenses/>. *
!**********************************************************************
subroutine gridcheck
!**********************************************************************
! *
! FLEXPART MODEL SUBROUTINE GRIDCHECK *
! *
!**********************************************************************
! *
! AUTHOR: G. WOTAWA *
! DATE: 1997-08-06 *
! LAST UPDATE: 1997-10-10 *
! *
! Update: 1999-02-08, global fields allowed, A. Stohl*
! CHANGE: 17/11/2005, Caroline Forster, GFS data *
! CHANGE: 11/01/2008, Harald Sodemann, GRIB1/2 input with *
! ECMWF grib_api *
! CHANGE: 03/12/2008, Harald Sodemann, update to f90 with *
! ECMWF grib_api *
! *
!**********************************************************************
! *
! DESCRIPTION: *
! *
! THIS SUBROUTINE DETERMINES THE GRID SPECIFICATIONS (LOWER LEFT *
! LONGITUDE, LOWER LEFT LATITUDE, NUMBER OF GRID POINTS, GRID DIST- *
! ANCE AND VERTICAL DISCRETIZATION OF THE ECMWF MODEL) FROM THE *
! GRIB HEADER OF THE FIRST INPUT FILE. THE CONSISTANCY (NO CHANGES *
! WITHIN ONE FLEXPART RUN) IS CHECKED IN THE ROUTINE "READWIND" AT *
! ANY CALL. *
! *
! XLON0 geographical longitude of lower left gridpoint *
! YLAT0 geographical latitude of lower left gridpoint *
! NX number of grid points x-direction *
! NY number of grid points y-direction *
! DX grid distance x-direction *
! DY grid distance y-direction *
! NUVZ number of grid points for horizontal wind *
! components in z direction *
! NWZ number of grid points for vertical wind *
! component in z direction *
! sizesouth, sizenorth give the map scale (i.e. number of virtual grid*
! points of the polar stereographic grid): *
! used to check the CFL criterion *
! UVHEIGHT(1)- heights of gridpoints where u and v are *
! UVHEIGHT(NUVZ) given *
! WHEIGHT(1)- heights of gridpoints where w is given *
! WHEIGHT(NWZ) *
! *
!**********************************************************************
use grib_api
use par_mod
use com_mod
use conv_mod
use cmapf_mod, only: stlmbr,stcm2p
implicit none
!HSO parameters for grib_api
integer :: ifile
integer :: iret
integer :: igrib
real(kind=4) :: xaux1,xaux2,yaux1,yaux2
real(kind=8) :: xaux1in,xaux2in,yaux1in,yaux2in
integer :: gribVer,parCat,parNum,typSurf,valSurf,discipl
!HSO end
integer :: ix,jy,i,ifn,ifield,j,k,iumax,iwmax,numskip
real :: sizesouth,sizenorth,xauxa,pint
real :: akm_usort(nwzmax)
real,parameter :: eps=0.0001
! NCEP GFS
real :: pres(nwzmax), help
integer :: i179,i180,i181
! VARIABLES AND ARRAYS NEEDED FOR GRIB DECODING
integer :: isec1(8),isec2(3)
real(kind=4) :: zsec4(jpunp)
character(len=1) :: opt
!HSO grib api error messages
character(len=24) :: gribErrorMsg = 'Error reading grib file'
character(len=20) :: gribFunction = 'gridcheckwind_gfs'
!
if (numbnests.ge.1) then
write(*,*) ' ###########################################'
write(*,*) ' FLEXPART ERROR SUBROUTINE GRIDCHECK:'
write(*,*) ' NO NESTED WINDFIELDAS ALLOWED FOR GFS! '
write(*,*) ' ###########################################'
stop
endif
iumax=0
iwmax=0
if(ideltas.gt.0) then
ifn=1
else
ifn=numbwf
endif
!
! OPENING OF DATA FILE (GRIB CODE)
!
5 call grib_open_file(ifile,path(3)(1:length(3)) &
//trim(wfname(ifn)),'r',iret)
if (iret.ne.GRIB_SUCCESS) then
goto 999 ! ERROR DETECTED
endif
!turn on support for multi fields messages
call grib_multi_support_on
ifield=0
10 ifield=ifield+1
!
! GET NEXT FIELDS
!
call grib_new_from_file(ifile,igrib,iret)
if (iret.eq.GRIB_END_OF_FILE ) then
goto 30 ! EOF DETECTED
elseif (iret.ne.GRIB_SUCCESS) then
goto 999 ! ERROR DETECTED
endif
!first see if we read GRIB1 or GRIB2
call grib_get_int(igrib,'editionNumber',gribVer,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
if (gribVer.eq.1) then ! GRIB Edition 1
!read the grib1 identifiers
call grib_get_int(igrib,'indicatorOfParameter',isec1(6),iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_int(igrib,'indicatorOfTypeOfLevel',isec1(7),iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_int(igrib,'level',isec1(8),iret)
call grib_check(iret,gribFunction,gribErrorMsg)
!get the size and data of the values array
call grib_get_real4_array(igrib,'values',zsec4,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
else ! GRIB Edition 2
!read the grib2 identifiers
call grib_get_int(igrib,'discipline',discipl,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_int(igrib,'parameterCategory',parCat,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_int(igrib,'parameterNumber',parNum,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_int(igrib,'typeOfFirstFixedSurface',typSurf,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_int(igrib,'scaledValueOfFirstFixedSurface', &
valSurf,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
!convert to grib1 identifiers
isec1(6)=-1
isec1(7)=-1
isec1(8)=-1
if ((parCat.eq.2).and.(parNum.eq.2).and.(typSurf.eq.100)) then ! U
isec1(6)=33 ! indicatorOfParameter
isec1(7)=100 ! indicatorOfTypeOfLevel
isec1(8)=valSurf/100 ! level, convert to hPa
elseif ((parCat.eq.3).and.(parNum.eq.5).and.(typSurf.eq.1)) then ! TOPO
isec1(6)=7 ! indicatorOfParameter
isec1(7)=1 ! indicatorOfTypeOfLevel
isec1(8)=0
elseif ((parCat.eq.0).and.(parNum.eq.0).and.(typSurf.eq.1) &
.and.(discipl.eq.2)) then ! LSM
isec1(6)=81 ! indicatorOfParameter
isec1(7)=1 ! indicatorOfTypeOfLevel
isec1(8)=0
endif
if (isec1(6).ne.-1) then
! get the size and data of the values array
call grib_get_real4_array(igrib,'values',zsec4,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
endif
endif ! gribVer
if(ifield.eq.1) then
!get the required fields from section 2
!store compatible to gribex input
call grib_get_int(igrib,'numberOfPointsAlongAParallel', &
isec2(2),iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_int(igrib,'numberOfPointsAlongAMeridian', &
isec2(3),iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_real8(igrib,'longitudeOfFirstGridPointInDegrees', &
xaux1in,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_real8(igrib,'longitudeOfLastGridPointInDegrees', &
xaux2in,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_real8(igrib,'latitudeOfLastGridPointInDegrees', &
yaux1in,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
call grib_get_real8(igrib,'latitudeOfFirstGridPointInDegrees', &
yaux2in,iret)
call grib_check(iret,gribFunction,gribErrorMsg)
xaux1=xaux1in
xaux2=xaux2in
yaux1=yaux1in
yaux2=yaux2in
nxfield=isec2(2)
ny=isec2(3)
if((abs(xaux1).lt.eps).and.(xaux2.ge.359)) then ! NCEP DATA FROM 0 TO
xaux1=-179.0 ! 359 DEG EAST ->
xaux2=-179.0+360.-360./real(nxfield) ! TRANSFORMED TO -179
endif ! TO 180 DEG EAST
if (xaux1.gt.180) xaux1=xaux1-360.0
if (xaux2.gt.180) xaux2=xaux2-360.0
if (xaux1.lt.-180) xaux1=xaux1+360.0
if (xaux2.lt.-180) xaux2=xaux2+360.0
if (xaux2.lt.xaux1) xaux2=xaux2+360.
xlon0=xaux1
ylat0=yaux1
dx=(xaux2-xaux1)/real(nxfield-1)
dy=(yaux2-yaux1)/real(ny-1)
dxconst=180./(dx*r_earth*pi)
dyconst=180./(dy*r_earth*pi)
!HSO end edits
! Check whether fields are global
! If they contain the poles, specify polar stereographic map
! projections using the stlmbr- and stcm2p-calls
!***********************************************************
xauxa=abs(xaux2+dx-360.-xaux1)
if (xauxa.lt.0.001) then
nx=nxfield+1 ! field is cyclic
xglobal=.true.
if (abs(nxshift).ge.nx) &
stop 'nxshift in file par_mod is too large'
xlon0=xlon0+real(nxshift)*dx
else
nx=nxfield
xglobal=.false.
if (nxshift.ne.0) &
stop 'nxshift (par_mod) must be zero for non-global domain'
endif
nxmin1=nx-1
nymin1=ny-1
if (xlon0.gt.180.) xlon0=xlon0-360.
xauxa=abs(yaux1+90.)
if (xglobal.and.xauxa.lt.0.001) then
sglobal=.true. ! field contains south pole
! Enhance the map scale by factor 3 (*2=6) compared to north-south
! map scale
sizesouth=6.*(switchsouth+90.)/dy
call stlmbr(southpolemap,-90.,0.)
call stcm2p(southpolemap,0.,0.,switchsouth,0.,sizesouth, &
sizesouth,switchsouth,180.)
switchsouthg=(switchsouth-ylat0)/dy
else
sglobal=.false.
switchsouthg=999999.
endif
xauxa=abs(yaux2-90.)
if (xglobal.and.xauxa.lt.0.001) then
nglobal=.true. ! field contains north pole
! Enhance the map scale by factor 3 (*2=6) compared to north-south
! map scale
sizenorth=6.*(90.-switchnorth)/dy
call stlmbr(northpolemap,90.,0.)
call stcm2p(northpolemap,0.,0.,switchnorth,0.,sizenorth, &
sizenorth,switchnorth,180.)
switchnorthg=(switchnorth-ylat0)/dy
else
nglobal=.false.
switchnorthg=999999.
endif
endif ! ifield.eq.1
if (nxshift.lt.0) stop 'nxshift (par_mod) must not be negative'
if (nxshift.ge.nxfield) stop 'nxshift (par_mod) too large'
! NCEP ISOBARIC LEVELS
!*********************
if((isec1(6).eq.33).and.(isec1(7).eq.100)) then ! check for U wind
iumax=iumax+1
pres(iumax)=real(isec1(8))*100.0
endif
i179=nint(179./dx)
if (dx.lt.0.7) then
i180=nint(180./dx)+1 ! 0.5 deg data
else
i180=nint(179./dx)+1 ! 1 deg data
endif
i181=i180+1
! NCEP TERRAIN
!*************
if((isec1(6).eq.007).and.(isec1(7).eq.001)) then
do jy=0,ny-1
do ix=0,nxfield-1
help=zsec4(nxfield*(ny-jy-1)+ix+1)
if(ix.le.i180) then
oro(i179+ix,jy)=help
excessoro(i179+ix,jy)=0.0 ! ISOBARIC SURFACES: SUBGRID TERRAIN DISREGARDED
else
oro(ix-i181,jy)=help
excessoro(ix-i181,jy)=0.0 ! ISOBARIC SURFACES: SUBGRID TERRAIN DISREGARDED
endif
end do
end do
endif
! NCEP LAND SEA MASK
!*******************
if((isec1(6).eq.081).and.(isec1(7).eq.001)) then
do jy=0,ny-1
do ix=0,nxfield-1
help=zsec4(nxfield*(ny-jy-1)+ix+1)
if(ix.le.i180) then
lsm(i179+ix,jy)=help
else
lsm(ix-i181,jy)=help
endif
end do
end do
endif
call grib_release(igrib)
goto 10 !! READ NEXT LEVEL OR PARAMETER
!
! CLOSING OF INPUT DATA FILE
!
! HSO
30 continue
call grib_close_file(ifile)
! HSO end edits
nuvz=iumax
nwz =iumax
nlev_ec=iumax
if (nx.gt.nxmax) then
write(*,*) 'FLEXPART error: Too many grid points in x direction.'
write(*,*) 'Reduce resolution of wind fields.'
write(*,*) 'Or change parameter settings in file par_mod.'
write(*,*) nx,nxmax
stop
endif
if (ny.gt.nymax) then
write(*,*) 'FLEXPART error: Too many grid points in y direction.'
write(*,*) 'Reduce resolution of wind fields.'
write(*,*) 'Or change parameter settings in file par_mod.'
write(*,*) ny,nymax
stop
endif
if (nuvz.gt.nuvzmax) then
write(*,*) 'FLEXPART error: Too many u,v grid points in z '// &
'direction.'
write(*,*) 'Reduce resolution of wind fields.'
write(*,*) 'Or change parameter settings in file par_mod.'
write(*,*) nuvz,nuvzmax
stop
endif
if (nwz.gt.nwzmax) then
write(*,*) 'FLEXPART error: Too many w grid points in z '// &
'direction.'
write(*,*) 'Reduce resolution of wind fields.'
write(*,*) 'Or change parameter settings in file par_mod.'
write(*,*) nwz,nwzmax
stop
endif
! If desired, shift all grids by nxshift grid cells
!**************************************************
if (xglobal) then
call shift_field_0(oro,nxfield,ny)
call shift_field_0(lsm,nxfield,ny)
call shift_field_0(excessoro,nxfield,ny)
endif
! Output of grid info
!********************
write(*,*)
write(*,*)
write(*,'(a,2i7)') '# of vertical levels in NCEP data: ', &
nuvz,nwz
write(*,*)
write(*,'(a)') 'Mother domain:'
write(*,'(a,f10.2,a1,f10.2,a,f10.2)') ' Longitude range: ', &
xlon0,' to ',xlon0+(nx-1)*dx,' Grid distance: ',dx
write(*,'(a,f10.2,a1,f10.2,a,f10.2)') ' Latitude range: ', &
ylat0,' to ',ylat0+(ny-1)*dy,' Grid distance: ',dy
write(*,*)
! CALCULATE VERTICAL DISCRETIZATION OF ECMWF MODEL
! PARAMETER akm,bkm DESCRIBE THE HYBRID "ETA" COORDINATE SYSTEM
numskip=nlev_ec-nuvz ! number of ecmwf model layers not used
! by trajectory model
do i=1,nwz
j=numskip+i
k=nlev_ec+1+numskip+i
akm_usort(nwz-i+1)=pres(nwz-i+1)
bkm(nwz-i+1)=0.0
end do
!******************************
! change Sabine Eckhardt: akm should always be in descending order ... readwind adapted!
!******************************
do i=1,nwz
if (akm_usort(1).gt.akm_usort(2)) then
akm(i)=akm_usort(i)
else
akm(i)=akm_usort(nwz-i+1)
endif
end do
!
! CALCULATION OF AKZ, BKZ
! AKZ,BKZ: model discretization parameters at the center of each model
! layer
!
! Assign the 10 m winds to an artificial model level with akz=0 and bkz=1.0,
! i.e. ground level
!*****************************************************************************
do i=1,nuvz
akz(i)=akm(i)
bkz(i)=bkm(i)
end do
! NOTE: In FLEXPART versions up to 4.0, the number of model levels was doubled
! upon the transformation to z levels. In order to save computer memory, this is
! not done anymore in the standard version. However, this option can still be
! switched on by replacing the following lines with those below, that are
! currently commented out. For this, similar changes are necessary in
! verttransform.f and verttranform_nests.f
!*****************************************************************************
nz=nuvz
if (nz.gt.nzmax) stop 'nzmax too small'
do i=1,nuvz
aknew(i)=akz(i)
bknew(i)=bkz(i)
end do
! Switch on following lines to use doubled vertical resolution
!*************************************************************
!nz=nuvz+nwz-1
!if (nz.gt.nzmax) stop 'nzmax too small'
!do 100 i=1,nwz
! aknew(2*(i-1)+1)=akm(i)
!00 bknew(2*(i-1)+1)=bkm(i)
!do 110 i=2,nuvz
! aknew(2*(i-1))=akz(i)
!10 bknew(2*(i-1))=bkz(i)
! End doubled vertical resolution
! Determine the uppermost level for which the convection scheme shall be applied
! by assuming that there is no convection above 50 hPa (for standard SLP)
!*****************************************************************************
do i=1,nuvz-2
pint=akz(i)+bkz(i)*101325.
if (pint.lt.5000.) goto 96
end do
96 nconvlev=i
if (nconvlev.gt.nconvlevmax-1) then
nconvlev=nconvlevmax-1
write(*,*) 'Attention, convection only calculated up to ', &
akz(nconvlev)+bkz(nconvlev)*1013.25,' hPa'
endif
return
999 write(*,*)
write(*,*) ' ###########################################'// &
'###### '
write(*,*) ' TRAJECTORY MODEL SUBROUTINE GRIDCHECK:'
write(*,*) ' CAN NOT OPEN INPUT DATA FILE '//wfname(ifn)
write(*,*) ' ###########################################'// &
'###### '
write(*,*)
write(*,'(a)') '!!! PLEASE INSERT A NEW CD-ROM AND !!!'
write(*,'(a)') '!!! PRESS ANY KEY TO CONTINUE... !!!'
write(*,'(a)') '!!! ...OR TERMINATE FLEXPART PRESSING!!!'
write(*,'(a)') '!!! THE "X" KEY... !!!'
write(*,*)
read(*,'(a)') opt
if(opt.eq.'X') then
stop
else
goto 5
endif
end subroutine gridcheck
|
