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!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
! version 3; Last Modified: May 7, 2008.
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SUBROUTINE LINTV_MINMAX (PVLEV,PVI1,PVI2,KNIDIM,KNI, 1
S KNPROF,KNO,PPO,PVO1,PVO2)
#if defined (DOC)
*
***s/r LINTV2 - Linear interpolation and constant value extrapolation.
* Input pressure levels can vary for each profile.
*
*
*Author : J. Halle *CMDA/AES Oct 1999
* (based on lintv)
*
*Revision 001 : J. Halle *CMDA/AES dec 2000
* adapt to TOVS level 1b.
*
*Revision 002 : JM Belanger *CMDA/SMC* june 2001
* 32 bits conversion.
*
*Revision 003 : J. Halle *CMDA/SMC* june 2002
* remove unnecessary comdecks.
*
*Revision 004: J. Halle CMDA/SMC Feb 2003
* replace dynamic memory allocation with automatic arrays.
*Revision 005: P. Koclas CMDA/SMC Apr 2003
* changed loop nesting order for ibm conversion
*Revision 006: S. Pellerin, ARMA, August 2008
* . Argument redefinition (LINTV -> LINTV_MINMAX)
* . Loop over profiles and kno to avoid multiple calls
* . Compute min and max in a single call
* . Introduction of OpenMP over outer profile loop
*Arguments
* i PVLEV(KNIDIM) : Vertical levels, pressure (source)
* i PVI(KNIDIM) : Vector to be interpolated (source)
* i KNIDIM : Dimension of input levels (source)
* i KNI : Number of input levels (source)
* i KNPROF : Number of profiles
* i KNO : Number of output levels (destination)
* i PPO(KNPROF,KNO) : Vertical levels, pressure (destination)
* o PVO(KNPROF,KNO) : Interpolated profiles (destination)
*
* -------------------
** Purpose: Performs the vertical interpolation in log of pressure
* and constant value extrapolation of one-dimensional vectors.
#endif
IMPLICIT NONE
*implicits
*
INTEGER JI, JK, JO, JN, IK, IORDER
INTEGER KNIDIM, KNI, KNO, KNPROF, ILEN, IERR
C
REAL*8 PVLEV(KNIDIM)
REAL*8 PPO(KNPROF,KNO), PVO1(KNPROF,KNO),PVO2(KNPROF,KNO)
REAL*8 PVI1(KNIDIM),pvi2(knidim)
C
REAL*8 ZPI (0:KNI+1)
REAL*8 ZPO (KNO)
REAL*8 ZPVI1(0:KNI+1),ZPVI2(0:KNI+1)
INTEGER IL (KNO)
C
REAL*8 ZW1, ZW2
REAL*8 ZP, XI, ZRT, ZP1, ZP2
C
C** 0. Dynamic memory allocation for temporary vectors
C . -----------------------------------------------
C
050 CONTINUE
C
C ... removed and replaced by automatic arrays, jh feb 2003 ......
C
C** 1. Initialization for vertical extrapolation (extra dummy levels)
C . --------------------------------------------------------------
C
100 CONTINUE
Cpik
ZPI(0)=2000.
ZPI(KNI+1)=2000.
C
C** 1.1 Determine if input pressure levels are in ascending or
C . descending order.
C . -------------------------------------------------------
C
IF ( PVLEV(1) .LT. PVLEV(KNI) ) THEN
IORDER = 1
ELSE
IORDER = -1
ENDIF
C
C** 2. Compute pressure levels pressure
C . ------------------------------------------------
C
200 CONTINUE
C
C** 2.1 Source levels
C . -------------
C
cpik
DO JK = 1, KNI
ZPI(JK) = PVLEV(JK)
ZPVI1(JK) = PVI1(JK)
ZPVI2(JK) = PVI2(JK)
ENDDO
ZPVI1(0) = PVI1(1)
ZPVI1(KNI+1) = PVI1(KNI)
ZPVI2(0) = PVI2(1)
ZPVI2(KNI+1) = PVI2(KNI)
C
C** 2.2 Destination levels
C . ------------------
c$omp parallel do default(shared)
c$omp+private(jk,zpo,il,ji,jo,zrt,zp,xi,ik,zp1,zp2,zw1,zw2)
DO JN = 1, KNPROF
DO JK = 1, KNO
ZPO(JK) = PPO(JN,JK)
ENDDO
C
C* 3. Interpolate in log of pressure or extrapolate with constant value
C* . for each destination pressure level
C . -----------------------------------------------------------------
C
C* . 3.1 Find the adjacent level below
C . -----------------------------
IL(:)=0
C
DO JI=1,KNI
DO JO=1,KNO
ZRT = ZPO(JO)
ZP = ZPI(JI)
XI = SIGN(1.0D0,IORDER*(ZRT-ZP))
IL(JO) = IL(JO) + MAX(0.0D0,XI)
ENDDO
ENDDO
C
C
C* . 3.3 Interpolation/extrapolation
C . ---------------------------
C
DO JO=1,KNO
IK = IL(JO)
ZP = ZPO(JO)
ZP1 = ZPI(IK)
ZP2 = ZPI(IK+1)
ZW1 = LOG(ZP/ZP2)/LOG(ZP1/ZP2)
ZW2 = 1. - ZW1
PVO1(JN,JO) = ZW1*ZPVI1(IK) + ZW2*ZPVI1(IK+1)
PVO2(JN,JO) = ZW1*ZPVI2(IK) + ZW2*ZPVI2(IK+1)
ENDDO
enddo
c$omp end parallel do
C
RETURN
END