| 1 | SUBROUTINE GPPREF(KPROMA,KSTART,KPROF,KFLEV,PVAH,PVBH,PALPH,PRESH,PRESF) |
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| 2 | |
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| 3 | !**** *GPPREF* - Computes full level pressure |
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| 4 | |
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| 5 | ! Purpose. |
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| 6 | ! -------- |
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| 7 | ! Computes pressures at half and full model levels. |
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| 8 | |
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| 9 | !** Interface. |
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| 10 | ! ---------- |
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| 11 | ! *CALL* *GPPREF(...) |
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| 12 | |
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| 13 | ! Explicit arguments : |
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| 14 | ! -------------------- |
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| 15 | ! KPROMA : dimensioning |
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| 16 | ! KSTART : start of work |
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| 17 | ! KPROF : depth of work |
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| 18 | ! KFLEV : vert. dimensioning |
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| 19 | ! PVAH(KFLEV),PVBH(KFLEV)- vertical coordinate |
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| 20 | ! PALPH (KPROMA,KFLEV) - COEFF OF THE HYDROST |
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| 21 | ! PRESH(KPROMA,0:KFLEV) - HALF LEVEL PRESSURE |
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| 22 | ! PRESF(KPROMA,KFLEV) - FULL LEVEL PRESSURE |
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| 23 | ! |
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| 24 | ! Implicit arguments : NONE. |
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| 25 | ! -------------------- |
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| 26 | |
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| 27 | ! Method. |
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| 28 | ! ------- |
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| 29 | ! See documentation |
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| 30 | |
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| 31 | ! Externals. None. |
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| 32 | ! ---------- |
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| 33 | |
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| 34 | ! Reference. |
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| 35 | ! ---------- |
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| 36 | ! ECMWF Research Department documentation of the IFS |
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| 37 | |
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| 38 | ! PHk*ln(PHk) - PHk-1*ln(PHk-1) |
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| 39 | ! Full level P: ln(PFk) = [ ------------------------------- - 1. ] |
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| 40 | ! PHk - PHk-1 |
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| 41 | |
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| 42 | ! which simplifies to: PFk = Pk+1/2 * exp(-ALPHA) |
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| 43 | |
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| 44 | ! In case of NDLNPR=1 it becomes even simpler (no need of LAPRXP any |
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| 45 | ! more in principle !) : |
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| 46 | ! PFk = Pk+1/2 * (1.-ALPHA) except at the top |
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| 47 | ! level : |
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| 48 | ! PF1 = P1.5 / (2+Cv/R) |
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| 49 | |
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| 50 | ! Author. |
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| 51 | ! ------- |
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| 52 | ! Erik Andersson, Mats Hamrud and Philippe Courtier *ECMWF* |
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| 53 | |
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| 54 | ! Modifications. |
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| 55 | ! -------------- |
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| 56 | ! Original : 92-11-23 |
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| 57 | ! Modified : 95-01-31 by Radmila Bubnova: correction in the case |
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| 58 | ! of the other approximation of d (ln p). |
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| 59 | ! Modified : 00-11-22 by Agathe Untch: modifications for vertical |
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| 60 | ! finite elements |
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| 61 | ! M.Hamrud 01-Oct-2003 CY28 Cleaning |
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| 62 | ! Modified : 04-11-15 by K. YESSAD: improve the hierarchy of tests |
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| 63 | ! Modified : 15-Feb-2005 by K. YESSAD: ZTOPPRES becomes TOPPRES |
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| 64 | ! ------------------------------------------------------------------ |
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| 65 | |
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| 66 | USE PARKIND1 ,ONLY : JPIM ,JPRB |
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| 67 | USE YOMHOOK ,ONLY : LHOOK, DR_HOOK |
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| 68 | |
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| 69 | USE YOMCT0 , ONLY : LAPRXPK |
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| 70 | USE YOMDYN , ONLY : NDLNPR |
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| 71 | USE YOMCST , ONLY : RD ,RCVD |
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| 72 | USE YOMCVER , ONLY : LVERTFE |
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| 73 | USE YOMGEM , ONLY : VAF ,VBF ,TOPPRES |
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| 74 | |
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| 75 | ! ------------------------------------------------------------------ |
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| 76 | |
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| 77 | IMPLICIT NONE |
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| 78 | |
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| 79 | INTEGER(KIND=JPIM),INTENT(IN) :: KPROMA |
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| 80 | INTEGER(KIND=JPIM),INTENT(IN) :: KFLEV |
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| 81 | INTEGER(KIND=JPIM),INTENT(IN) :: KSTART |
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| 82 | INTEGER(KIND=JPIM),INTENT(IN) :: KPROF |
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| 83 | REAL(KIND=JPRB) :: PVAH(0:KFLEV) ! Argument NOT used |
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| 84 | REAL(KIND=JPRB) :: PVBH(0:KFLEV) ! Argument NOT used |
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| 85 | REAL(KIND=JPRB) ,INTENT(IN) :: PALPH(KPROMA,KFLEV) |
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| 86 | REAL(KIND=JPRB) ,INTENT(IN) :: PRESH(KPROMA,0:KFLEV) |
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| 87 | REAL(KIND=JPRB) ,INTENT(OUT) :: PRESF(KPROMA,KFLEV) |
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| 88 | |
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| 89 | ! ------------------------------------------------------------------ |
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| 90 | |
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| 91 | INTEGER(KIND=JPIM) :: IFIRST, JLEV, JLON |
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| 92 | REAL(KIND=JPRB) :: ZMUL |
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| 93 | REAL(KIND=JPRB) :: ZHOOK_HANDLE |
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| 94 | |
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| 95 | ! ------------------------------------------------------------------ |
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| 96 | |
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| 97 | IF (LHOOK) CALL DR_HOOK('GPPREF',0,ZHOOK_HANDLE) |
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| 98 | |
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| 99 | ! ------------------------------------------------------------------ |
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| 100 | |
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| 101 | !* 1. Level to begin normal computations |
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| 102 | ! ---------------------------------- |
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| 103 | |
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| 104 | ! This is introduced to allow the use of GPPREF without the implicit |
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| 105 | ! assumption that the top level input for pressure is 0 hPa. |
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| 106 | ! This restriction is only necessary in the case of use of NDLNPR=1. |
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| 107 | ! |
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| 108 | ! LVERTFE : .T./.F. Finite element/conventional vertical discretisation. |
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| 109 | ! NDLNPR : NDLNPR=0: conventional formulation of delta, i.e. ln(P(l)/P(l-1)). |
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| 110 | ! NDLNPR=1: formulation of delta used in non hydrostatic model, |
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| 111 | ! LAPRXPK : way of computing full-levels pressures in primitive equation |
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| 112 | ! |
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| 113 | LVERTFE=.TRUE. !!!!! A REVOIR (MPL) comment faut-il vraiment calculer PRESF ? |
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| 114 | |
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| 115 | IF ((.NOT.LVERTFE).AND.(NDLNPR == 1)) THEN |
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| 116 | IF(PRESH(KSTART,0) <= TOPPRES)THEN |
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| 117 | IFIRST=2 |
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| 118 | ELSE |
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| 119 | IFIRST=1 |
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| 120 | DO JLON=KSTART,KPROF |
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| 121 | IF(PRESH(JLON,0) <= TOPPRES)THEN |
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| 122 | IFIRST=2 |
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| 123 | EXIT |
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| 124 | ENDIF |
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| 125 | ENDDO |
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| 126 | ENDIF |
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| 127 | ENDIF |
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| 128 | |
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| 129 | ! ------------------------------------------------------------------ |
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| 130 | |
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| 131 | !* 2. COMPUTES FULL LEVEL PRESSURES. |
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| 132 | ! ------------------------------ |
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| 133 | |
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| 134 | IF (LVERTFE) THEN |
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| 135 | DO JLEV=1,KFLEV |
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| 136 | ! print *,'GPPREF: LVERTFE KFLEV KSTART KPROF JLEV',LVERTFE,KFLEV,KSTART,KPROF,JLEV |
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| 137 | PRESF(KSTART:KPROF,JLEV)=VAF(JLEV)+VBF(JLEV)*PRESH(KSTART:KPROF,KFLEV) |
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| 138 | ENDDO |
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| 139 | ELSE |
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| 140 | IF (NDLNPR == 0) THEN |
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| 141 | IF (LAPRXPK) THEN |
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| 142 | DO JLEV=1,KFLEV |
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| 143 | DO JLON=KSTART,KPROF |
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| 144 | PRESF(JLON,JLEV)=(PRESH(JLON,JLEV-1)+PRESH(JLON,JLEV))*0.5_JPRB |
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| 145 | ENDDO |
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| 146 | ENDDO |
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| 147 | ELSE |
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| 148 | DO JLEV=1,KFLEV |
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| 149 | DO JLON=KSTART,KPROF |
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| 150 | PRESF(JLON,JLEV)=EXP(-PALPH(JLON,JLEV))*PRESH(JLON,JLEV) |
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| 151 | ENDDO |
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| 152 | ENDDO |
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| 153 | ENDIF |
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| 154 | ELSEIF (NDLNPR == 1) THEN |
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| 155 | DO JLEV=IFIRST,KFLEV |
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| 156 | DO JLON=KSTART,KPROF |
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| 157 | PRESF(JLON,JLEV)=(1.0_JPRB-PALPH(JLON,JLEV))*PRESH(JLON,JLEV) |
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| 158 | ENDDO |
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| 159 | ENDDO |
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| 160 | ZMUL=1.0_JPRB/(2.0_JPRB+RCVD/RD) |
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| 161 | DO JLEV=1,IFIRST-1 |
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| 162 | DO JLON=KSTART,KPROF |
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| 163 | PRESF(JLON,JLEV)=PRESH(JLON,JLEV)*ZMUL |
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| 164 | ENDDO |
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| 165 | ENDDO |
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| 166 | ENDIF |
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| 167 | ENDIF |
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| 168 | |
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| 169 | ! ------------------------------------------------------------------ |
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| 170 | |
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| 171 | IF (LHOOK) CALL DR_HOOK('GPPREF',1,ZHOOK_HANDLE) |
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| 172 | END SUBROUTINE GPPREF |
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