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|
C Copyright 1981-2007 ECMWF
C
C Licensed under the GNU Lesser General Public License which
C incorporates the terms and conditions of version 3 of the GNU
C General Public License.
C See LICENSE and gpl-3.0.txt for details.
C
INTEGER FUNCTION INTUVPH( KFIELD1, KFIELD2, INLEN,
X KUGRIBO, KVGRIBO,
X OUTLENU, OUTLENV)
C
C---->
C**** INTUVPH
C
C Purpose
C -------
C
C Interpolate GRIB format input spectral vorticity and divergence,
C or spectral U and V, fields to GRIB format U and V fields.
C
C
C Interface
C ---------
C
C IRET = INTUVPH(KFIELD1,KFIELD2,INLEN,
C KUGRIBO,KVGRIBO,OUTLENU,OUTLENV)
C
C Input
C -----
C
C KFIELD1 - Input vorticity or U field (spectral, GRIB format).
C KFIELD2 - Input divergence or V field (spectral, GRIB format).
C INLEN - Input field length (words).
C
C
C Output
C ------
C
C KUGRIBO - Output U field (GRIB format).
C KVGRIBO - Output V field (GRIB format).
C OUTLENU - Output U field length (words).
C OUTLENV - Output V field length (words).
C
C
C Method
C ------
C
C Convert spectral vorticity/divergence to spectral U/V and then
C interpolate U and V to output fields.
C
C Note that a common block is used in intf.h to hold the U/V
C fields before interpolation.
C
C Externals
C ---------
C
C IBASINI - Ensure basic interpolation setup is done.
C INTUVDH - Encodes/decodes data into/from GRIB code.
C INTUVXH - Interpolate U or V component spectral field to grid point.
C JVOD2UV - Converts spectral vorticity/divergence to spectral U/V.
C JMEMHAN - Allocate scratch memory.
C GRIBEX - GRIB decoding/encoding.
C ISCRSZ - Calculate number of values in generated field.
C FIXAREA - Fixup area definition to correspond to grid definitions
C INTLOG - Log error message.
C RESET_C - Reset interpolation handling options using GRIB product.
C INSANE - Ensure no outrageous values given for interpolation.
C GRSMKP - P factor calculation switch for routine GRIBEX.
C
C
C Author
C ------
C
C J.D.Chambers ECMWF February 2001
C
C
C----<
C -----------------------------------------------------------------|
C
IMPLICIT NONE
C
C Function arguments
C
INTEGER KFIELD1(*), KFIELD2(*), INLEN
INTEGER KUGRIBO(*), KVGRIBO(*), OUTLENU, OUTLENV
C
#include "parim.h"
#include "nifld.common"
#include "nofld.common"
#include "grfixed.h"
#include "intf.h"
C
C Parameters
C
INTEGER JPROUTINE, JPALLOC, JPDEALL, JPSCR3, JPSCR4,JPSCR5
PARAMETER (JPROUTINE = 40160 )
PARAMETER (JPALLOC = 1)
PARAMETER (JPDEALL = 0)
PARAMETER (JPSCR3 = 3)
PARAMETER (JPSCR4 = 4)
PARAMETER (JPSCR5 = 5)
C
C Local variables
C
CHARACTER*1 HFUNC
REAL EW, NS
LOGICAL LOLDWIND
INTEGER IERR,KPR,ISZVD,ISZUV,IWORD,ISIZE,ILENF,ISAME,IPARAM
INTEGER NEXT, LOOP, MTRUNC, NTRUNC, NTROLD, NTROLD2, NPARAM
INTEGER MIRESO, MORESO, NOLD, NLEN
C
LOGICAL LFIRST, LNEWUV
CHARACTER*3 EXTRA
DATA LFIRST/.TRUE./, LNEWUV/.TRUE./, EXTRA/'NO '/
SAVE LFIRST, LNEWUV
C
DATA NTROLD/-1/, NTROLD2/-1/
SAVE NTROLD, NTROLD2
INTEGER IPVORT, IPDIV, IP_U, IP_V, IDIVOFF
#ifdef POINTER_64
INTEGER*8 IZNFLDO
#endif
REAL ZNFLDO
POINTER ( IZNFLDO, ZNFLDO )
DIMENSION ZNFLDO( 1 )
#ifdef POINTER_64
INTEGER*8 IUV, IVD
#endif
REAL UV, VD
POINTER ( IUV, UV )
POINTER ( IVD, VD )
DIMENSION UV( 1 ), VD( 1 )
C
C Externals
C
INTEGER RESET_C,ISCRSZ,FIXAREA,AURESOL
INTEGER IBASINI, INSANE, INTUVDH, INTUVXH
C
C -----------------------------------------------------------------|
C* Section 1. Initialise
C -----------------------------------------------------------------|
C
100 CONTINUE
C
INTUVPH = 0
IERR = 0
KPR = 0
C
IF( LFIRST ) THEN
CALL GETENV('IGNORE_UV_EXTRA_MODE', EXTRA)
IF((EXTRA(1:1).EQ.'Y').OR.(EXTRA(1:1).EQ.'y')) LNEWUV = .FALSE.
IF( LNEWUV ) THEN
CALL INTLOG(JP_DEBUG,
X 'INTUVPH: IGNORE_UV_EXTRA_MODE not turned on',JPQUIET)
ELSE
CALL INTLOG(JP_DEBUG,
X 'INTUVPH: IGNORE_UV_EXTRA_MODE turned on',JPQUIET)
ENDIF
LFIRST = .FALSE.
ENDIF
C
MIRESO = NIRESO
MORESO = NORESO
C
LOLDWIND = LWINDSET
C
C Ensure that basic initialisation has been done
C
IERR = IBASINI(0)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTUVPH: basic initialise failed',JPQUIET)
INTUVPH = IERR
GOTO 900
ENDIF
C
C -----------------------------------------------------------------|
C* Section 2. Unpack the input fields.
C -----------------------------------------------------------------|
C
200 CONTINUE
C
C Need to establish input truncation, so unpack GRIB sections 1
C and 2.
C
IPARAM = 0
ISZVD = 1
IERR = INTUVDH(VD(IPVORT),ISZVD,KFIELD1,INLEN,'I',IPARAM)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTUVPH: GRIB header decode failed',IERR)
INTUVPH = IERR
GOTO 900
ENDIF
C
C Check that the input is an ECMWF spectral field
C
IF( (ISEC1(1).NE.128).OR.(ISEC2(1).NE.50) ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: Input is not ECMWF spectral field.',JPQUIET)
INTUVPH = JPROUTINE + 2
GOTO 900
ENDIF
C
C Get scratch memory for input unpacked fields.
C Unpacked field memory areas are adjacent.
C
NIRESO = ISEC2(2)
ISZVD = (NIRESO+1)*(NIRESO+2)
IPVORT = 1
IPDIV = 1 + ISZVD
CALL JMEMHAN( JPSCR4, IVD, ISZVD*2, JPALLOC, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: Scratch memory type 4 allocation failed.',JPQUIET)
INTUVPH = IERR
GOTO 900
ENDIF
C
C Decode input fields..
C
IERR = INTUVDH(VD(IPVORT),ISZVD,KFIELD1,INLEN,'D',IPARAM)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTUVPH: Vorticity decoding failed',IERR)
INTUVPH = IERR
GOTO 900
ENDIF
C
IERR = INTUVDH(VD(IPDIV),ISZVD,KFIELD2,INLEN,'D',IPARAM)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTUVPH: Divergence decoding failed',IERR)
INTUVPH = IERR
GOTO 900
ENDIF
C
C Setup interpolation options from input GRIB characteristics.
C
IERR = RESET_C( ISEC1, ISEC2, ZSEC2, ISEC4)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: Setup interp. options from GRIB failed.',JPQUIET)
INTUVPH = IERR
GOTO 900
ENDIF
C
C Check that no outrageous values given for interpolation
C
ISAME = INSANE()
IF( (ISAME.GT.0).AND.(ISAME.NE.27261) ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: Interpolation cannot use given values.',JPQUIET)
INTUVPH = ISAME
GOTO 900
ENDIF
C
C -----------------------------------------------------------------|
C* Section 3. Convert spectral vorticity/divergence
C to spectral U/V
C -----------------------------------------------------------------|
C
300 CONTINUE
C
C Spectral U and V for Tn are to be generated from vorticity
C and divergence spectral T(n-1)
C
C Get scratch memory for U and V spectral fields.
C The memory areas are adjacent.
C
IF( ISEC1(6).EQ.155 ) THEN
C
C Truncate vorticity and divergence to correspond to U/V
C
NTRUNC = NORESO - 1
C
IF( LNEWUV ) THEN
MTRUNC = NTRUNC + 1
ELSE
NTRUNC = NTRUNC + 1
MTRUNC = NTRUNC
ENDIF
C
C Check whether user requested a truncation before interpolation
C
IF( .NOT.LNORESO ) THEN
C
C If user did not supply a truncation value, see whether or
C not the 'autoresol' flag is set. If not, use the input
C truncation.
C
IF( LARESOL ) THEN
IF( (NOREPR.EQ.JPREGULAR).OR.(NOREPR.EQ.JPREGROT) ) THEN
EW = FLOAT(NOGRID(1))/PPMULT
NS = FLOAT(NOGRID(2))/PPMULT
ELSE
EW = 90.0/FLOAT(NOGAUSS)
NS = EW
ENDIF
NTRUNC = AURESOL(EW,NS)
IF( NTRUNC.NE.NTROLD ) THEN
NTROLD = NTRUNC
CALL INTLOG(JP_WARN,
X 'INTUVPH: Resolution automatically set to ', NTRUNC)
ENDIF
ELSE
NTRUNC = NIRESO
ENDIF
C
ENDIF
C
C Check whether the output resolution is greater than the input
C
IF( NTRUNC.GT.NIRESO ) THEN
C
C Issue warning if the output resolution was user-supplied
C
IF( .NOT.LARESOL ) THEN
C
C Revert to the input truncation
C
IF( NIRESO.NE.NTROLD2 ) THEN
CALL INTLOG(JP_WARN,
X 'INTUVPH: spectral -> grid point interpolation',JPQUIET)
CALL INTLOG(JP_WARN,
X 'INTUVPH: User supplied resolution = ',NTRUNC)
CALL INTLOG(JP_WARN,
X 'INTUVPH: Input field resolution = ',NIRESO)
CALL INTLOG(JP_WARN,
X 'INTUVPH: User supplied resolution ignored',JPQUIET)
CALL INTLOG(JP_WARN,
X 'INTUVPH: Input field resolution has been used',JPQUIET)
NTROLD2 = NIRESO
ENDIF
NTRUNC = NIRESO
C
ELSE
C
C Revert to the input truncation
C
NTRUNC = NIRESO
IF( NTRUNC.NE.NTROLD2 ) THEN
NTROLD2 = NTRUNC
CALL INTLOG(JP_WARN,
X 'INTUVPH: Auto-resolution selection too high',JPQUIET)
CALL INTLOG(JP_WARN,
X 'INTUVPH: Resolution set to input resolution: ',NTRUNC)
ENDIF
ENDIF
ENDIF
C
MTRUNC = NTRUNC
IF( LNEWUV ) NTRUNC = MTRUNC - 1
C
CALL INTLOG(JP_DEBUG,'INTUVPH: vo/div truncation = ', NTRUNC)
CALL INTLOG(JP_DEBUG,'INTUVPH: U/V truncation = ', MTRUNC)
C
ISIZE = (NTRUNC+1)*(NTRUNC+2)
CALL JMEMHAN( JPSCR5, IZNFLDO, ISIZE*2, JPALLOC, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVP: Scratch memory type 5 allocation failed.',JPQUIET)
INTUVPH = JPROUTINE + 4
GOTO 900
ENDIF
C
CALL SH2SH( VD(IPVORT), NIRESO, ZNFLDO, NTRUNC )
C
IDIVOFF = IPVORT + (NTRUNC+1)*(NTRUNC+2)
CALL SH2SH( VD(IPDIV), NIRESO, ZNFLDO(IDIVOFF), NTRUNC )
C
NEXT = 0
DO LOOP = NTRUNC, 0, -1
NEXT = NEXT + LOOP + 1
ZNFLDO(IDIVOFF+NEXT*2-2) = 0
ZNFLDO(IDIVOFF+NEXT*2-1) = 0
ZNFLDO(IPVORT +NEXT*2-2) = 0
ZNFLDO(IPVORT +NEXT*2-1) = 0
ENDDO
C
ISZUV = (MTRUNC+1)*(MTRUNC+2)
IP_U = 1
IP_V = 1 + ISZUV
CALL JMEMHAN( JPSCR3, IUV, ISZUV*2, JPALLOC, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: Scratch memory type 3 allocation failed.',JPQUIET)
INTUVPH = IERR
GOTO 900
ENDIF
C
C Generate U and V from vorticity and divergence,
C
CALL JVOD2UV(ZNFLDO(IPVORT),ZNFLDO(IDIVOFF),NTRUNC,
X UV(IP_U),UV(IP_V),MTRUNC)
C
ELSE
C
C Get scratch memory for U and V spectral fields.
C The memory areas are adjacent.
C
NTRUNC = NIRESO
ISZUV = (NIRESO+1)*(NIRESO+2)
IP_U = 1
IP_V = 1 + ISZUV
CALL JMEMHAN( JPSCR3, IUV, ISZUV*2, JPALLOC, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: Scratch memory type 3 allocation failed.',JPQUIET)
INTUVPH = IERR
GOTO 900
ENDIF
C
C Transfer input spectral U and V to the memory areas.
C
DO LOOP = 0, ISZUV-1
UV(IP_U + LOOP) = VD(IPVORT + LOOP)
UV(IP_V + LOOP) = VD(IPDIV + LOOP)
ENDDO
C
ENDIF
C
C -----------------------------------------------------------------|
C* Section 4. Handle spectral output.
C -----------------------------------------------------------------|
C
400 CONTINUE
C
IF( (LNORESO) .AND.
X ((NOREPR.EQ.JPSPHERE).OR.(NOREPR.EQ.JPSPHROT)) ) THEN
C
CALL INTLOG(JP_DEBUG,
X 'INTUVPH: Produce spectral output with truncation',NORESO)
C
C Set GRIBEX flag to force recalculation of complex packing factor
C
CALL GRSMKP(1)
C
ISIZE = (NORESO+1)*(NORESO+2)
CALL JMEMHAN( JPSCR5, IZNFLDO, ISIZE*2, JPALLOC, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: Scratch memory type 5 allocation failed.',JPQUIET)
INTUVPH = JPROUTINE + 4
GOTO 900
ENDIF
C
IP_U = 1
CALL SH2SH( UV(1), NIRESO, ZNFLDO(IP_U), NORESO )
C
IP_V = 1 + (NORESO+1)*(NORESO+2)
CALL SH2SH( UV(1+ISZUV), NIRESO, ZNFLDO(IP_V), NORESO )
C
NIRESO = NORESO
C
ENDIF
C
C Has all processing been done (ie is the output spectral)?
C
IF( (NOREPR.EQ.JPSPHERE).OR.(NOREPR.EQ.JPSPHROT) ) THEN
C
C Code U into GRIB
C
IERR = INTUVDH(ZNFLDO(IP_U),ISZUV,KUGRIBO,OUTLENU,'C',JP_U)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: U encoding into GRIB failed.',IERR)
INTUVPH = JPROUTINE + 4
GOTO 900
ENDIF
C
C Code V into GRIB
C
IERR = INTUVDH(ZNFLDO(IP_V),ISZUV,KVGRIBO,OUTLENV,'C',JP_V)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: V encoding into GRIB failed.',IERR)
INTUVPH = JPROUTINE + 4
GOTO 490
ENDIF
C
490 CONTINUE
C
C Turn off GRIBEX flag which forces recalculation of complex
C packing factor
C
CALL GRSMKP(0)
C
GOTO 900
C
ENDIF
C
C -----------------------------------------------------------------|
C* Section 6. Generate interpolated GRIB format U and V fields.
C -----------------------------------------------------------------|
C
600 CONTINUE
C
C Get scratch space for interpolation
C
IERR = FIXAREA()
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTUVPH: Fixarea failed.',JPQUIET)
INTUVPH = IERR
GOTO 900
ENDIF
C
ISIZE = ISCRSZ()*2
IF( ISIZE.LE.0 ) THEN
CALL INTLOG(JP_ERROR,'INTUVPH: Get scratch space failed.',ISIZE)
INTUVPH = JPROUTINE + 5
GOTO 900
ENDIF
CALL JMEMHAN( JPSCR5, IZNFLDO, ISIZE, JPALLOC, IERR)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: Scratch memory(5) allocation failed.',JPQUIET)
INTUVPH = JPROUTINE + 5
GOTO 900
ENDIF
C
LWIND = .TRUE.
LWINDSET = .TRUE.
C
C Interpolate U and V
C
NOLD = NIRESO
NIRESO = MTRUNC
IERR = INTUVXH(UV,ISZUV,ZNFLDO,KUGRIBO,KVGRIBO,OUTLENU,OUTLENV)
IF( IERR.NE.0 ) THEN
CALL INTLOG(JP_ERROR,
X 'INTUVPH: U/V interpolation failed.',JPQUIET)
INTUVPH = JPROUTINE + 6
GOTO 900
ENDIF
C
NIRESO = NOLD
C
C -----------------------------------------------------------------|
C* Section 9. Return
C -----------------------------------------------------------------|
C
900 CONTINUE
C
C Clear change flags for next product processing and reset wind flag
C
LCHANGE = .FALSE.
LSMCHNG = .FALSE.
LWINDSET = LOLDWIND
LWIND = .FALSE.
C
NIRESO = MIRESO
NORESO = MORESO
C
RETURN
END
|
