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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
SUBROUTINE JWSCAL( PZFA, KLATS, KLONS, KFIRST, PLATS)
C
C---->
C**** JWSCAL
C
C PURPOSE
C _______
C
C This routine applies a scale factor to all latitudes except
C the poles
C
C INTERFACE
C _________
C
C CALL JWSCAL( PZFA, KLATS, KLONS, KFIRST, PLATS)
C
C Input parameters
C ________________
C
C PZFA - Array of wind field (U or V) fourier coefficients
C KLATS - Number of latitude lines in PZFA
C KLONS - Number of longitude points in each line of latitude
C KFIRST - First latitude to process in PLATS
C PLATS - Array of gaussian latitudes (degrees)
C
C Output parameters
C ________________
C
C PZFA - Modified array of fourier coefficients
C
C Common block usage
C __________________
C
C None.
C
C Method
C ______
C
C Apply latitude-dependent scale factor to all coefficients.
C It is assumed that no latitude is at the North or South pole.
C
C Externals
C _________
C
C SSCAL - Apply scalar correction to row of values
C
C
C Reference
C _________
C
C None
C
C
C Comments
C ________
C
C PZFA contains pairs of north/south latitudes.
C
C
C AUTHOR
C ______
C
C J.D.Chambers *ECMWF* Jan 1994
C
C MODIFICATIONS
C _____________
C
C None.
C
C----<
C _______________________________________________________
C
C* Section 0. Definition of variables.
C _______________________________________________________
C
C* Prefix conventions for variable names
C
C Logical L (but not LP), global or common.
C O, dummy argument
C G, local variable
C LP, parameter.
C Character C, global or common.
C H, dummy argument
C Y (but not YP), local variable
C YP, parameter.
C Integer M and N, global or common.
C K, dummy argument
C I, local variable
C J (but not JP), loop control
C JP, parameter.
C Real A to F and Q to X, global or common.
C P (but not PP), dummy argument
C Z, local variable
C PP, parameter.
C
IMPLICIT NONE
C
#include "jparams.h"
C
C Subroutine arguments
C
REAL PZFA
DIMENSION PZFA(JPLONO+2, 64)
INTEGER KLATS, KLONS, KFIRST
REAL PLATS
DIMENSION PLATS(*)
C
C Local variables
C
INTEGER JNEXTLAT, INORTH, ISOUTH
REAL ZCOSI, ZLAT, ZPIBY2, ZDEGR
C _______________________________________________________
C
C* Section 1. Initialization.
C _______________________________________________________
C
100 CONTINUE
ZPIBY2 = PPI / 2.0
ZDEGR = PPI / 180.0
C
C _______________________________________________________
C
C* Section 2. Apply scale factor to all latitudes.
C _______________________________________________________
C
200 CONTINUE
INORTH = -1
DO 220 JNEXTLAT = 1, KLATS
ZLAT = PLATS( KFIRST + JNEXTLAT - 1 )
INORTH = INORTH + 2
ISOUTH = INORTH + 1
ZCOSI = 1.0 / COS( ZLAT * ZDEGR )
CALL SSCAL( KLONS, ZCOSI, PZFA( 2, INORTH), 1)
CALL SSCAL( KLONS, ZCOSI, PZFA( 2, ISOUTH), 1)
220 CONTINUE
C _______________________________________________________
C
C* Section 9. Return to calling routine.
C _______________________________________________________
C
900 CONTINUE
C
RETURN
END
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