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|
subroutine readwind(indj,n)
***********************************************************************
* *
* TRAJECTORY MODEL SUBROUTINE READWIND *
* *
***********************************************************************
* *
* AUTHOR: G. WOTAWA *
* DATE: 1997-08-05 *
* LAST UPDATE: ---------- *
* Update: 1998-07-29, global fields allowed *
* A. Stohl, G. Wotawa *
* Update: 2001-01-05 NCEP Data Pressure levels *
* *
***********************************************************************
* *
* DESCRIPTION: *
* *
* READING OF ECMWF METEOROLOGICAL FIELDS FROM INPUT DATA FILES. THE *
* INPUT DATA FILES ARE EXPECTED TO BE AVAILABLE IN GRIB CODE *
* *
* INPUT: *
* indj indicates number of the wind field to be read in *
* n temporal index for meteorological fields (1 to 3)*
* *
* IMPORTANT VARIABLES FROM COMMON BLOCK: *
* *
* wfname File name of data to be read in *
* nxfield,ny,nuvz,nwz expected field dimensions *
* nlev_ec number of vertical levels ecmwf model *
* uu,vv,ww wind fields *
* tt,qq temperature and specific humidity *
* ps surface pressure *
* *
***********************************************************************
use grib_api
include 'includepar'
include 'includecom'
integer ii,indj,i,j,k,n,ifield,iumax
integer ix,jy,induvz,indwz,numpt,numpu,numpv,numpw,numprh
real help,temp,plev,ew,elev
* VARIABLES AND ARRAYS NEEDED FOR GRIB DECODING
C dimension of isec2 at least (22+n), where n is the number of parallels or
C meridians in a quasi-regular (reduced) Gaussian or lat/long grid
C dimension of zsec2 at least (10+nn), where nn is the number of vertical
C coordinate parameters
integer isec1(56),isec2(22+nxmax+nymax)
real zsec4(jpunp)
real xaux,yaux,xaux0,yaux0
real ylat,xlon,wdummy,ffpol,ddpol,xlonr
real uuaux,vvaux,uupolaux,vvpolaux
logical error
! parameters for grib_api
integer ifile
integer iret
integer igrib
integer*4 isize
integer gribVer,parCat,parNum,typSurf,valSurf
real*8 zsecn4(jpunp*4)
real*8 xauxin,yauxin
integer i179,i180,i181
iumax=0
*
* OPENING OF DATA FILE (GRIB CODE)
*
*
* OPENING OF DATA FILE (GRIB CODE)
*
!HSO
! print*,'reading winds from ',path(3)(1:len(3))
! >//trim(wfname(indj)),'|'
!5 iret=grib_open_file(ifile,path(3)(1:len(3))
5 call grib_open_file(ifile,path(3)(1:len(3))
>//trim(wfname(indj)),'r',iret)
call grib_check(iret,'flextra','readwind_gfs.f')
! turn on support for multi fields messages
call grib_multi_support_on()
numpt=0
numpu=0
numpv=0
numpw=0
numprh=0
ifield=0
10 ifield=ifield+1
*
* GET NEXT FIELDS
*
call grib_new_from_file(ifile,igrib,iret)
if (igrib .eq. -1 ) then
if (iret .ne. -1) then
call grib_check(iret,'flextra','readwind_gfs.f')
goto 888 ! ERROR DETECTED
endif
goto 50 ! EOF DETECTED
endif
! first see if we read GRIB1 or GRIB2
call grib_get_int( igrib,
>'editionNumber',gribVer, iret)
call grib_check(iret, 'flextra', 'readwind_gfs.f')
! get the size and data of the values array
call grib_get_size(igrib,'values',isize)
call grib_get_real8_array(igrib,'values',zsecn4,isize)
do i=1,isize
zsec4(i)=zsecn4(i)
enddo
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,'flextra','readwind_gfs.f')
call grib_get_int( igrib,
>'indicatorOfTypeOfLevel',isec1(7), iret)
call grib_check(iret,'flextra','readwind_gfs.f')
call grib_get_int( igrib,
> 'level',isec1(8), iret)
call grib_check(iret,'flextra','readwind_gfs.f')
else ! GRIB Edition 2
! read the grib2 identifiers
call grib_get_int( igrib,
>'parameterCategory',parCat, iret)
call grib_check(iret,'flextra','readwind_gfs.f')
call grib_get_int( igrib,
>'parameterNumber',parNum, iret)
call grib_check(iret,'flextra','readwind_gfs.f')
call grib_get_int( igrib,
> 'typeOfFirstFixedSurface',typSurf, iret)
call grib_check(iret,'flextra','readwind_gfs.f')
call grib_get_int( igrib,
> 'scaledValueOfFirstFixedSurface',valSurf, iret)
call grib_check(iret,'flextra','readwind_gfs.f')
! convert to grib1 identifiers
isec1(6)=-1
isec1(7)=-1
isec1(8)=-1
if ((parCat.eq.0).and.(parNum.eq.0).and.(typSurf.eq.100)) then ! T
isec1(6)=11 ! indicatorOfParameter
isec1(7)=100 ! indicatorOfTypeOfLevel
isec1(8)=valSurf/100 ! level, convert to hPa
elseif ((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.2).and.(parNum.eq.3).and.(typSurf.eq.100)) then ! V
isec1(6)=34 ! indicatorOfParameter
isec1(7)=100 ! indicatorOfTypeOfLevel
isec1(8)=valSurf/100 ! level, convert to hPa
elseif ((parCat.eq.2).and.(parNum.eq.8).and.(typSurf.eq.100)) then ! W
isec1(6)=39 ! indicatorOfParameter
isec1(7)=100 ! indicatorOfTypeOfLevel
isec1(8)=valSurf/100 ! level, convert to hPa
elseif ((parCat.eq.1).and.(parNum.eq.1).and.(typSurf.eq.100)) then ! RH
isec1(6)=52 ! indicatorOfParameter
isec1(7)=100 ! indicatorOfTypeOfLevel
isec1(8)=valSurf/100 ! level, convert to hPa
elseif ((parCat.eq.1).and.(parNum.eq.1).and.(typSurf.eq.103)) then ! RH2
isec1(6)=52 ! indicatorOfParameter
isec1(7)=105 ! indicatorOfTypeOfLevel
isec1(8)=2
elseif ((parCat.eq.0).and.(parNum.eq.0).and.(typSurf.eq.103)) then ! T2
isec1(6)=11 ! indicatorOfParameter
isec1(7)=105 ! indicatorOfTypeOfLevel
isec1(8)=2
elseif ((parCat.eq.2).and.(parNum.eq.2).and.(typSurf.eq.103)) then ! U10
isec1(6)=33 ! indicatorOfParameter
isec1(7)=105 ! indicatorOfTypeOfLevel
isec1(8)=10
elseif ((parCat.eq.2).and.(parNum.eq.3).and.(typSurf.eq.103)) then ! V10
isec1(6)=34 ! indicatorOfParameter
isec1(7)=105 ! indicatorOfTypeOfLevel
isec1(8)=10
elseif ((parCat.eq.3).and.(parNum.eq.1).and.(typSurf.eq.101)) then ! SLP
isec1(6)=2 ! indicatorOfParameter
isec1(7)=102 ! indicatorOfTypeOfLevel
isec1(8)=0
elseif ((parCat.eq.3).and.(parNum.eq.0).and.(typSurf.eq.1)) then ! SP
isec1(6)=1 ! indicatorOfParameter
isec1(7)=1 ! indicatorOfTypeOfLevel
isec1(8)=0
elseif ((parCat.eq.1).and.(parNum.eq.13).and.(typSurf.eq.1)) then ! SNOW
isec1(6)=66 ! indicatorOfParameter
isec1(7)=1 ! indicatorOfTypeOfLevel
isec1(8)=0
elseif ((parCat.eq.0).and.(parNum.eq.0).and.(typSurf.eq.104)) then ! T sigma 0
isec1(6)=11 ! indicatorOfParameter
isec1(7)=107 ! indicatorOfTypeOfLevel
isec1(8)=0.995 ! lowest sigma level
elseif ((parCat.eq.2).and.(parNum.eq.2).and.(typSurf.eq.104)) then ! U sigma 0
isec1(6)=33 ! indicatorOfParameter
isec1(7)=107 ! indicatorOfTypeOfLevel
isec1(8)=0.995 ! lowest sigma level
elseif ((parCat.eq.2).and.(parNum.eq.3).and.(typSurf.eq.104)) then ! V sigma 0
isec1(6)=34 ! indicatorOfParameter
isec1(7)=107 ! indicatorOfTypeOfLevel
isec1(8)=0.995 ! lowest sigma level
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)) then ! LSM
isec1(6)=81 ! indicatorOfParameter
isec1(7)=1 ! indicatorOfTypeOfLevel
isec1(8)=0
elseif ((parCat.eq.3).and.(parNum.eq.196).and.(typSurf.eq.1)) then ! BLH
isec1(6)=221 ! indicatorOfParameter
isec1(7)=1 ! indicatorOfTypeOfLevel
isec1(8)=0
elseif ((parCat.eq.1).and.(parNum.eq.7).and.(typSurf.eq.1)) then ! LSP/TP
isec1(6)=62 ! indicatorOfParameter
isec1(7)=1 ! indicatorOfTypeOfLevel
isec1(8)=0
elseif ((parCat.eq.1).and.(parNum.eq.196).and.(typSurf.eq.1)) then ! CP
isec1(6)=63 ! indicatorOfParameter
isec1(7)=1 ! indicatorOfTypeOfLevel
isec1(8)=0
endif
endif ! gribVer
C Check whether we are on a little endian or on a big endian computer
*********************************************************************
c if (inbuff(1).eq.1112101447) then ! little endian, swap bytes
c iswap=1+ilen/4
c call swap32(inbuff,iswap)
c else if (inbuff(1).ne.1196575042) then ! big endian
c stop 'subroutine gridcheck: corrupt GRIB data'
c endif
c if (ierr.ne.0) goto 10 ! ERROR DETECTED
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,'flextra','readwind_gfs.f')
call grib_get_int( igrib,
>'numberOfPointsAlongAMeridian',isec2(3), iret)
call grib_check(iret,'flextra','readwind_gfs.f')
call grib_get_real8(igrib,
>'longitudeOfFirstGridPointInDegrees',xauxin, iret)
call grib_check(iret,'flextra','readwind_gfs.f')
call grib_get_real8(igrib,
>'latitudeOfLastGridPointInDegrees',yauxin, iret)
call grib_check(iret,'flextra','readwind_gfs.f')
xaux=xauxin
yaux=yauxin
* CHECK GRID SPECIFICATIONS
if(isec2(2).ne.nxfield) stop 'READWIND: NX NOT CONSISTENT'
if(isec2(3).ne.ny) stop 'READWIND: NY NOT CONSISTENT'
if(xaux.eq.0.) xaux=-179.0 ! NCEP DATA
xaux0=xlon0
yaux0=ylat0
if(xaux.lt.0.) xaux=xaux+360.
if(yaux.lt.0.) yaux=yaux+360.
if(xaux0.lt.0.) xaux0=xaux0+360.
if(yaux0.lt.0.) yaux0=yaux0+360.
if(abs(xaux-xaux0).gt.eps)
& stop 'READWIND: LOWER LEFT LONGITUDE NOT CONSISTENT'
if(abs(yaux-yaux0).gt.eps)
& stop 'READWIND: LOWER LEFT LATITUDE NOT CONSISTENT'
endif
!HSO end of edits
i179=nint(179./dx)
i180=nint(179./dx)+1
i181=i180+1
do 20 j=0,ny-1
do 20 i=0,nxfield-1
if((isec1(6).eq.011).and.(isec1(7).eq.100)) then
* TEMPERATURE
if((i.eq.0).and.(j.eq.0)) then
do 21 ii=1,nuvz
if ((isec1(8)*100.0).eq.akz(ii)) numpt=ii
21 continue
endif
help=zsec4(nxfield*(ny-j-1)+i+1)
if(i.le.i180) then
tt(i179+i,j,numpt,n)=help
else
tt(i-i181,j,numpt,n)=help
endif
endif
if((isec1(6).eq.033).and.(isec1(7).eq.100)) then
* U VELOCITY
if((i.eq.0).and.(j.eq.0)) then
do 22 ii=1,nuvz
if ((isec1(8)*100.0).eq.akz(ii)) numpu=ii
22 continue
endif
help=zsec4(nxfield*(ny-j-1)+i+1)
if(i.le.i180) then
uu(i179+i,j,numpu,n)=help
else
uu(i-i181,j,numpu,n)=help
endif
endif
if((isec1(6).eq.034).and.(isec1(7).eq.100)) then
* V VELOCITY
if((i.eq.0).and.(j.eq.0)) then
do 23 ii=1,nuvz
if ((isec1(8)*100.0).eq.akz(ii)) numpv=ii
23 continue
endif
help=zsec4(nxfield*(ny-j-1)+i+1)
if(i.le.i180) then
vv(i179+i,j,numpv,n)=help
else
vv(i-i181,j,numpv,n)=help
endif
endif
if((isec1(6).eq.039).and.(isec1(7).eq.100)) then
* W VELOCITY
if((i.eq.0).and.(j.eq.0)) then
do 25 ii=1,nuvz
if ((isec1(8)*100.0).eq.akz(ii)) numpw=ii
25 continue
endif
help=zsec4(nxfield*(ny-j-1)+i+1)
if(i.le.i180) then
ww(i179+i,j,numpw,n)=help
else
ww(i-i181,j,numpw,n)=help
endif
endif
if((isec1(6).eq.052).and.(isec1(7).eq.100)) then
* RELATIVE HUMIDITY -> CONVERT TO SPECIFIC HUMIDITY
if((i.eq.0).and.(j.eq.0)) then
do 24 ii=1,nuvz
if ((isec1(8)*100.0).eq.akz(ii)) numprh=ii
24 continue
endif
help=zsec4(nxfield*(ny-j-1)+i+1)
if(i.le.i180) then
qq(i179+i,j,numprh,n)=help
else
qq(i-i181,j,numprh,n)=help
endif
endif
if((isec1(6).eq.001).and.(isec1(7).eq.001)) then
* SURFACE PRESSURE
help=zsec4(nxfield*(ny-j-1)+i+1)
if(i.le.i180) then
ps(i179+i,j,1,n)=help
else
ps(i-i181,j,1,n)=help
endif
endif
if((isec1(6).eq.007).and.(isec1(7).eq.001)) then
* TOPOGRAPHY
help=zsec4(nxfield*(ny-j-1)+i+1)
if(i.le.i180) then
oro(i179+i,j)=help
else
oro(i-i181,j)=help
endif
endif
20 continue
if((isec1(6).eq.33).and.(isec1(7).eq.100)) iumax=iumax+1
if (igrib.ne.-1) then
call grib_release(igrib, iret)
call grib_check(iret,'flextra','readwind_gfs.f')
endif
goto 10 !! READ NEXT LEVEL OR PARAMETER
50 continue
*
* CLOSING OF INPUT DATA FILE
*
call grib_close_file(ifile, iret)
call grib_check(iret,'flextra','readwind_gfs.f')
* TRANSFORM RH TO SPECIFIC HUMIDITY AS NEEDED
do 65 j=0,ny-1
do 65 i=0,nxfield-1
do 65 k=1,nuvz
help=qq(i,j,k,n)
temp=tt(i,j,k,n)
plev=akm(k)
elev=ew(temp)*help/100.0
qq(i,j,k,n)=xmwml*(elev/(plev-((1.0-xmwml)*elev)))
65 continue
C For global fields, assign rightmost grid point the value of the
C leftmost point
*****************************************************************
if (xglobal) then
do 70 j=0,ny-1
oro(nx-1,j)=oro(0,j)
ps(nx-1,j,1,n)=ps(0,j,1,n)
do 71 induvz=1,nuvz
tt(nx-1,j,induvz,n)=tt(0,j,induvz,n)
qq(nx-1,j,induvz,n)=qq(0,j,induvz,n)
uu(nx-1,j,induvz,n)=uu(0,j,induvz,n)
71 vv(nx-1,j,induvz,n)=vv(0,j,induvz,n)
do 70 indwz=1,nwz
70 ww(nx-1,j,indwz,n)=ww(0,j,indwz,n)
endif
C If north pole is in the domain, calculate wind velocities in polar
C stereographic coordinates
********************************************************************
if (nglobal) then
do 74 jy=int(switchnorthg)-2,ny-1
ylat=ylat0+float(jy)*dy
do 74 ix=0,nx-1
xlon=xlon0+float(ix)*dx
do 74 induvz=1,nuvz
74 call cc2gll(northpolemap,ylat,xlon,uu(ix,jy,induvz,n),
+ vv(ix,jy,induvz,n),uupol(ix,jy,induvz,n),
+ vvpol(ix,jy,induvz,n))
do 76 induvz=1,nuvz
* CALCULATE FFPOL, DDPOL FOR CENTRAL GRID POINT
xlon=xlon0+float(nx/2-1)*dx
xlonr=xlon*pi/180.
ffpol=sqrt(uu(nx/2-1,ny-1,induvz,n)**2+
& vv(nx/2-1,ny-1,induvz,n)**2)
if(vv(nx/2-1,ny-1,induvz,n).lt.0.) then
if(vv(nx/2-1,ny-1,induvz,n).gt.-0.00001)
& vv(nx/2-1,ny-1,induvz,n)=-0.00001
ddpol=atan(uu(nx/2-1,ny-1,induvz,n)/
& vv(nx/2-1,ny-1,induvz,n))-xlonr
else
if(vv(nx/2-1,ny-1,induvz,n).lt. 0.00001)
& vv(nx/2-1,ny-1,induvz,n)= 0.00001
ddpol=pi+atan(uu(nx/2-1,ny-1,induvz,n)/
& vv(nx/2-1,ny-1,induvz,n))-xlonr
endif
if(ddpol.lt.0.) ddpol=2.0*pi+ddpol
if(ddpol.gt.2.0*pi) ddpol=ddpol-2.0*pi
* CALCULATE U,V FOR 180 DEG, TRANSFORM TO POLAR STEREOGRAPHIC GRID
xlon=180.0
xlonr=xlon*pi/180.
ylat=90.0
uuaux=-ffpol*sin(xlonr+ddpol)
vvaux=-ffpol*cos(xlonr+ddpol)
call cc2gll(northpolemap,ylat,xlon,uuaux,vvaux,uupolaux,
+ vvpolaux)
jy=ny-1
do 76 ix=0,nx-1
uupol(ix,jy,induvz,n)=uupolaux
vvpol(ix,jy,induvz,n)=vvpolaux
76 continue
* Fix: Set W at pole to the zonally averaged W of the next equator-
* ward parallel of latitude
do 85 indwz=1,nwz
wdummy=0.
jy=ny-2
do 80 ix=0,nx-1
80 wdummy=wdummy+ww(ix,jy,indwz,n)
wdummy=wdummy/float(nx)
jy=ny-1
do 85 ix=0,nx-1
85 ww(ix,jy,indwz,n)=wdummy
endif
C If south pole is in the domain, calculate wind velocities in polar
C stereographic coordinates
********************************************************************
if (sglobal) then
do 77 jy=0,int(switchsouthg)+3
ylat=ylat0+float(jy)*dy
do 77 ix=0,nx-1
xlon=xlon0+float(ix)*dx
do 77 induvz=1,nuvz
77 call cc2gll(southpolemap,ylat,xlon,uu(ix,jy,induvz,n),
+ vv(ix,jy,induvz,n),uupol(ix,jy,induvz,n),
+ vvpol(ix,jy,induvz,n))
do 79 induvz=1,nuvz
* CALCULATE FFPOL, DDPOL FOR CENTRAL GRID POINT
xlon=xlon0+float(nx/2-1)*dx
xlonr=xlon*pi/180.
ffpol=sqrt(uu(nx/2-1,0,induvz,n)**2+
& vv(nx/2-1,0,induvz,n)**2)
if(vv(nx/2-1,0,induvz,n).lt.0.) then
if(vv(nx/2-1,0,induvz,n).gt.-0.00001)
& vv(nx/2-1,0,induvz,n)=-0.00001
ddpol=atan(uu(nx/2-1,0,induvz,n)/
& vv(nx/2-1,0,induvz,n))+xlonr
else
if(vv(nx/2-1,0,induvz,n).lt. 0.00001)
& vv(nx/2-1,0,induvz,n)= 0.00001
ddpol=pi+atan(uu(nx/2-1,0,induvz,n)/
& vv(nx/2-1,0,induvz,n))+xlonr
endif
if(ddpol.lt.0.) ddpol=2.0*pi+ddpol
if(ddpol.gt.2.0*pi) ddpol=ddpol-2.0*pi
* CALCULATE U,V FOR 180 DEG, TRANSFORM TO POLAR STEREOGRAPHIC GRID
xlon=180.0
xlonr=xlon*pi/180.
ylat=-90.0
uuaux=+ffpol*sin(xlonr-ddpol)
vvaux=-ffpol*cos(xlonr-ddpol)
call cc2gll(northpolemap,ylat,xlon,uuaux,vvaux,uupolaux,
+ vvpolaux)
jy=0
do 79 ix=0,nx-1
uupol(ix,jy,induvz,n)=uupolaux
79 vvpol(ix,jy,induvz,n)=vvpolaux
* Fix: Set W at pole to the zonally averaged W of the next equator-
* ward parallel of latitude
do 95 indwz=1,nwz
wdummy=0.
jy=1
do 90 ix=0,nx-1
90 wdummy=wdummy+ww(ix,jy,indwz,n)
wdummy=wdummy/float(nx)
jy=0
do 95 ix=0,nx-1
95 ww(ix,jy,indwz,n)=wdummy
endif
WRITE(*,*) WFTIME(INDJ),' SEC ',WFTIME(INDJ)/3600,' HRS ',
+WFTIME(INDJ)/3600/24,' DAYS ', WFNAME(INDJ)
if(iumax.ne.nuvz) stop 'READWIND: NUVZ NOT CONSISTENT'
if(iumax.ne.nwz) stop 'READWIND: NWZ NOT CONSISTENT'
C Calculate potential temperature and potential vorticity on whole grid
***********************************************************************
call calcpv(n)
return
888 write(*,*) ' #### TRAJECTORY MODEL ERROR! WINDFIELD #### '
write(*,*) ' #### ',wfname(indj),' #### '
write(*,*) ' #### IS NOT GRIB FORMAT !!! #### '
stop 'Execution terminated'
999 write(*,*) ' #### TRAJECTORY MODEL ERROR! WINDFIELD #### '
write(*,*) ' #### ',wfname(indj),' #### '
write(*,*) ' #### CANNOT BE OPENED !!! #### '
error=1
end
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