| 1 | ! |
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| 2 | !$Id: cdrag.F90 ???? 2015-??-?? ??:??:??Z ? $ |
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| 3 | ! |
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| 4 | SUBROUTINE cdrag( knon, nsrf, & |
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| 5 | speed, t1, q1, zgeop1, & |
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| 6 | psol, tsurf, qsurf, z0m, z0h, & |
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| 7 | pcfm, pcfh, zri, pref ) |
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| 8 | |
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| 9 | USE dimphy |
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| 10 | USE indice_sol_mod |
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| 11 | IMPLICIT NONE |
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| 12 | ! ================================================================= c |
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| 13 | ! |
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| 14 | ! Objet : calcul des cdrags pour le moment (pcfm) et |
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| 15 | ! les flux de chaleur sensible et latente (pcfh). |
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| 16 | ! |
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| 17 | ! Modified histroy: |
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| 18 | ! 27-Jan-2014: richardson number inconsistant between |
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| 19 | ! coefcdrag.F90 and clcdrag.F90, Fuxing WANG wrote this subroutine |
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| 20 | ! by merging coefcdrag and clcdrag. |
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| 21 | ! |
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| 22 | ! References: |
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| 23 | ! Louis, J. F., 1979: A parametric model of vertical eddy fluxes in the |
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| 24 | ! atmosphere. Boundary-Layer Meteorology. 01/1979; 17(2):187-202. |
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| 25 | ! Louis, J. F., Tiedtke, M. and Geleyn, J. F., 1982: `A short history of the |
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| 26 | ! operational PBL parametrization at ECMWF'. Workshop on boundary layer |
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| 27 | ! parametrization, November 1981, ECMWF, Reading, England. |
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| 28 | ! Page: 19. Equations in Table 1. |
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| 29 | ! Anton Beljaars. May 1992. The parametrization of the planetary boundary layer. |
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| 30 | ! European Centre for Medium-Range Weather Forecasts. |
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| 31 | ! Equations: 110-113. Page 40. |
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| 32 | ! Miller,M.J., A.C.M.Beljaars, T.N.Palmer. 1992. The sensitivity of the ECMWF |
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| 33 | ! model to the parameterization of evaporation from the tropical oceans. J. |
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| 34 | ! Climate, 5:418-434. |
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| 35 | ! |
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| 36 | ! ================================================================= c |
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| 37 | ! |
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| 38 | ! knon----input-I- nombre de points pour un type de surface |
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| 39 | ! nsrf----input-I- indice pour le type de surface; voir indicesol.h |
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| 40 | ! speed---input-R- module du vent au 1er niveau du modele |
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| 41 | ! t1------input-R- temperature de l'air au 1er niveau du modele |
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| 42 | ! q1------input-R- humidite de l'air au 1er niveau du modele |
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| 43 | ! zgeop---input-R- geopotentiel au 1er niveau du modele |
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| 44 | ! psol----input-R- pression au sol |
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| 45 | ! tsurf---input-R- temperature de l'air a la surface |
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| 46 | ! qsurf---input-R- humidite de l'air a la surface |
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| 47 | ! z0m, z0h---input-R- rugosite |
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| 48 | !! u1, v1 are removed, speed is used. Fuxing WANG, 04/03/2015, |
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| 49 | !! u1------input-R- vent zonal au 1er niveau du modele |
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| 50 | !! v1------input-R- vent meridien au 1er niveau du modele |
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| 51 | ! |
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| 52 | ! pcfm---output-R- cdrag pour le moment |
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| 53 | ! pcfh---output-R- cdrag pour les flux de chaleur latente et sensible |
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| 54 | ! zri----output-R- Richardson number |
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| 55 | ! pref---output-R- pression au niveau zgeop/RG |
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| 56 | ! |
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| 57 | ! Parameters: |
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| 58 | ! ckap-----Karman constant |
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| 59 | ! cb,cc,cd-parameters in Louis et al., 1982 |
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| 60 | ! ================================================================= c |
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| 61 | ! |
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| 62 | ! |
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| 63 | ! Parametres d'entree |
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| 64 | !***************************************************************** |
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| 65 | INTEGER, INTENT(IN) :: knon, nsrf |
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| 66 | REAL, DIMENSION(klon), INTENT(IN) :: speed ! module du vent au 1er niveau du modele |
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| 67 | REAL, DIMENSION(klon), INTENT(IN) :: zgeop1! geopotentiel au 1er niveau du modele |
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| 68 | REAL, DIMENSION(klon), INTENT(IN) :: psol ! pression au sol |
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| 69 | REAL, DIMENSION(klon), INTENT(IN) :: t1 ! temperature at 1st level |
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| 70 | REAL, DIMENSION(klon), INTENT(IN) :: q1 ! humidity at 1st level |
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| 71 | REAL, DIMENSION(klon), INTENT(IN) :: tsurf ! Surface temperature (K) |
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| 72 | REAL, DIMENSION(klon), INTENT(IN) :: qsurf ! Surface humidity (Kg/Kg) |
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| 73 | REAL, DIMENSION(klon), INTENT(IN) :: z0m, z0h ! Rugosity at surface (m) |
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| 74 | ! paprs, pplay u1, v1: to be deleted |
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| 75 | ! they were in the old clcdrag. Fuxing WANG, 04/03/2015 |
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| 76 | ! REAL, DIMENSION(klon,klev+1), INTENT(IN) :: paprs |
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| 77 | ! REAL, DIMENSION(klon,klev), INTENT(IN) :: pplay |
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| 78 | ! REAL, DIMENSION(klon), INTENT(IN) :: u1, v1 |
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| 79 | |
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| 80 | ! Parametres de sortie |
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| 81 | !****************************************************************** |
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| 82 | REAL, DIMENSION(klon), INTENT(OUT) :: pcfm ! Drag coefficient for heat flux |
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| 83 | REAL, DIMENSION(klon), INTENT(OUT) :: pcfh ! Drag coefficient for momentum |
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| 84 | REAL, DIMENSION(klon), INTENT(OUT) :: zri ! Richardson number |
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| 85 | REAL, DIMENSION(klon), INTENT(OUT) :: pref ! Pression au niveau zgeop/RG |
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| 86 | |
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| 87 | ! Parametres local |
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| 88 | INTEGER :: ng_q1 ! Number of grids that q1 < 0.0 |
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| 89 | INTEGER :: ng_qsurf ! Number of grids that qsurf < 0.0 |
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| 90 | ! zgeop1, psol: to be deleted, they are inputs now. Fuxing WANG, 04/03/2015 |
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| 91 | ! REAL, DIMENSION(klon) :: zgeop1! geopotentiel au 1er niveau du modele |
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| 92 | ! REAL, DIMENSION(klon) :: psol ! pression au sol |
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| 93 | ! |
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| 94 | ! ================================================================= c |
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| 95 | ! |
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| 96 | INCLUDE "YOMCST.h" |
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| 97 | INCLUDE "YOETHF.h" |
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| 98 | ! INCLUDE "indicesol.h" |
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| 99 | INCLUDE "clesphys.h" |
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| 100 | INCLUDE "iniprint.h" |
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| 101 | ! |
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| 102 | ! Quelques constantes et options: |
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| 103 | !!$PB REAL, PARAMETER :: ckap=0.35, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
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| 104 | REAL, PARAMETER :: CKAP=0.40, CB=5.0, CC=5.0, CD=5.0, CEPDU2 = (0.1)**2 |
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| 105 | ! |
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| 106 | ! Variables locales : |
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| 107 | INTEGER :: i |
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| 108 | REAL :: zdu2, ztsolv |
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| 109 | REAL :: ztvd, zscf |
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| 110 | REAL :: zucf, zcr |
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| 111 | REAL :: friv, frih |
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| 112 | REAL, DIMENSION(klon) :: zcfm1, zcfm2 ! Drag coefficient for momentum |
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| 113 | REAL, DIMENSION(klon) :: zcfh1, zcfh2 ! Drag coefficient for heat flux |
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| 114 | LOGICAL, PARAMETER :: zxli=.FALSE. ! calcul des cdrags selon Laurent Li |
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| 115 | REAL, DIMENSION(klon) :: zcdn_m, zcdn_h ! Drag coefficient in neutral conditions |
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| 116 | ! |
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| 117 | ! Fonctions thermodynamiques et fonctions d'instabilite |
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| 118 | REAL :: fsta, fins, x |
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| 119 | fsta(x) = 1.0 / (1.0+10.0*x*(1+8.0*x)) |
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| 120 | fins(x) = SQRT(1.0-18.0*x) |
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| 121 | |
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| 122 | ! ================================================================= c |
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| 123 | ! Fuxing WANG, 04/03/2015, delete the calculation of zgeop1 |
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| 124 | ! (le geopotentiel du premier couche de modele). |
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| 125 | ! zgeop1 is an input ivariable in this subroutine. |
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| 126 | ! DO i = 1, knon |
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| 127 | ! zgeop1(i) = RD * t1(i) / (0.5*(paprs(i,1)+pplay(i,1))) & |
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| 128 | ! * (paprs(i,1)-pplay(i,1)) |
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| 129 | ! END DO |
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| 130 | ! ================================================================= c |
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| 131 | ! |
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| 132 | ! Fuxing WANG, 04/03/2015 |
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| 133 | ! To check if there are negative q1, qsurf values. |
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| 134 | ng_q1 = 0 ! Initialization |
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| 135 | ng_qsurf = 0 ! Initialization |
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| 136 | DO i = 1, knon |
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| 137 | IF (q1(i).LT.0.0) ng_q1 = ng_q1 + 1 |
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| 138 | IF (qsurf(i).LT.0.0) ng_qsurf = ng_qsurf + 1 |
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| 139 | ENDDO |
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| 140 | IF (ng_q1.GT.0) THEN |
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| 141 | WRITE(lunout,*)" *** Warning: Negative q1(humidity at 1st level) values in cdrag.F90 !" |
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| 142 | WRITE(lunout,*)" The total number of the grids is: ", ng_q1 |
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| 143 | WRITE(lunout,*)" The negative q1 is set to zero " |
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| 144 | ! abort_message="voir ci-dessus" |
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| 145 | ! CALL abort_gcm(modname,abort_message,1) |
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| 146 | ENDIF |
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| 147 | IF (ng_qsurf.GT.0) THEN |
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| 148 | WRITE(lunout,*)" *** Warning: Negative qsurf(humidity at surface) values in cdrag.F90 !" |
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| 149 | WRITE(lunout,*)" The total number of the grids is: ", ng_qsurf |
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| 150 | WRITE(lunout,*)" The negative qsurf is set to zero " |
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| 151 | ! abort_message="voir ci-dessus" |
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| 152 | ! CALL abort_gcm(modname,abort_message,1) |
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| 153 | ENDIF |
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| 154 | |
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| 155 | ! Calculer le frottement au sol (Cdrag) |
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| 156 | DO i = 1, knon |
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| 157 | !------------------------------------------------------------ |
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| 158 | ! u1, v1 are replaced by speed. Fuxing WANG, 04/03/2015, |
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| 159 | ! zdu2 = MAX(CEPDU2,u1(i)**2+v1(i)**2) |
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| 160 | !------------------------------------------------------------ |
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| 161 | zdu2 = MAX(CEPDU2, speed(i)**2) |
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| 162 | ! psol(i) = paprs(i,1) |
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| 163 | pref(i) = EXP(LOG(psol(i)) - zgeop1(i)/(RD*t1(i)* & |
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| 164 | (1.+ RETV * max(q1(i),0.0)))) ! negative q1 set to zero |
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| 165 | !------------ the old calculations in clcdrag---------------- |
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| 166 | ! ztsolv = tsurf(i) * (1.0+RETV*qsurf(i)) |
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| 167 | ! ztvd = (t1(i)+zgeop1(i)/RCPD/(1.+RVTMP2*q1(i))) & |
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| 168 | ! *(1.+RETV*q1(i)) |
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| 169 | !------------------------------------------------------------ |
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| 170 | ! Fuxing WANG, 04/03/2015, in this revised version, |
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| 171 | ! the negative qsurf and q1 are set to zero (as in coefcdrag) |
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| 172 | ztsolv = tsurf(i) * (1.0+RETV*max(qsurf(i),0.0)) ! negative qsurf set to zero |
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| 173 | ztvd = (t1(i)+zgeop1(i)/RCPD/(1.+RVTMP2*q1(i))) & |
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| 174 | *(1.+RETV*max(q1(i),0.0)) ! negative q1 set to zero |
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| 175 | zri(i) = zgeop1(i)*(ztvd-ztsolv)/(zdu2*ztvd) |
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| 176 | |
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| 177 | |
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| 178 | ! Coefficients CD neutres pour m et h |
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| 179 | zcdn_m(i) = (CKAP/LOG(1.+zgeop1(i)/(RG*z0m(i))))**2 |
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| 180 | zcdn_h(i) = (CKAP/LOG(1.+zgeop1(i)/(RG*z0h(i))))**2 |
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| 181 | |
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| 182 | IF (zri(i) .GT. 0.) THEN ! situation stable |
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| 183 | zri(i) = MIN(20.,zri(i)) |
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| 184 | IF (.NOT.zxli) THEN |
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| 185 | zscf = SQRT(1.+CD*ABS(zri(i))) |
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| 186 | friv = AMAX1(1. / (1.+2.*CB*zri(i)/ZSCF), f_ri_cd_min) |
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| 187 | zcfm1(i) = zcdn_m(i) * friv |
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| 188 | frih = AMAX1(1./ (1.+3.*CB*zri(i)*ZSCF), f_ri_cd_min ) |
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| 189 | !!$ PB zcfh1(i) = zcdn(i) * frih |
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| 190 | !!$ PB zcfh1(i) = f_cdrag_stable * zcdn(i) * frih |
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| 191 | zcfh1(i) = f_cdrag_ter * zcdn_h(i) * frih |
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| 192 | IF(nsrf.EQ.is_oce) zcfh1(i) = f_cdrag_oce * zcdn_h(i) * frih |
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| 193 | !!$ PB |
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| 194 | pcfm(i) = zcfm1(i) |
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| 195 | pcfh(i) = zcfh1(i) |
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| 196 | ELSE |
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| 197 | pcfm(i) = zcdn_m(i)* fsta(zri(i)) |
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| 198 | pcfh(i) = zcdn_h(i)* fsta(zri(i)) |
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| 199 | ENDIF |
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| 200 | ELSE ! situation instable |
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| 201 | IF (.NOT.zxli) THEN |
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| 202 | zucf = 1./(1.+3.0*CB*CC*zcdn_m(i)*SQRT(ABS(zri(i)) & |
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| 203 | *(1.0+zgeop1(i)/(RG*z0m(i))))) |
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| 204 | zcfm2(i) = zcdn_m(i)*amax1((1.-2.0*CB*zri(i)*zucf),f_ri_cd_min) |
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| 205 | !!$ PB zcfh2(i) = zcdn_h(i)*amax1((1.-3.0*cb*zri(i)*zucf),f_ri_cd_min) |
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| 206 | zcfh2(i) = f_cdrag_ter*zcdn_h(i)*amax1((1.-3.0*CB*zri(i)*zucf),f_ri_cd_min) |
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| 207 | pcfm(i) = zcfm2(i) |
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| 208 | pcfh(i) = zcfh2(i) |
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| 209 | ELSE |
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| 210 | pcfm(i) = zcdn_m(i)* fins(zri(i)) |
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| 211 | pcfh(i) = zcdn_h(i)* fins(zri(i)) |
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| 212 | ENDIF |
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| 213 | IF(iflag_gusts==0) THEN |
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| 214 | ! cdrah sur l'ocean cf. Miller et al. (1992) - only active when gustiness parameterization is not active |
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| 215 | zcr = (0.0016/(zcdn_m(i)*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
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| 216 | IF(nsrf.EQ.is_oce) pcfh(i) =f_cdrag_oce* zcdn_h(i)*(1.0+zcr**1.25)**(1./1.25) |
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| 217 | ENDIF |
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| 218 | ENDIF |
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| 219 | END DO |
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| 220 | |
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| 221 | ! ================================================================= c |
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| 222 | |
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| 223 | ! IM cf JLD : on seuille cdrag_m et cdrag_h |
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| 224 | IF (nsrf == is_oce) THEN |
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| 225 | DO i=1,knon |
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| 226 | pcfm(i)=MIN(pcfm(i),cdmmax) |
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| 227 | pcfh(i)=MIN(pcfh(i),cdhmax) |
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| 228 | END DO |
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| 229 | END IF |
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| 230 | |
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| 231 | END SUBROUTINE cdrag |
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