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module orodrag_m |
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|
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IMPLICIT NONE |
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|
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contains |
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SUBROUTINE orodrag(nlon, nlev, ktest, ptsphy, paphm1, papm1, pgeom1, ptm1, & |
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pum1, pvm1, pmea, pstd, psig, pgamma, ptheta, ppic, pval, pulow, & |
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pvlow, pvom, pvol, pte) |
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|
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USE dimens_m |
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USE dimphy |
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use gwstress_m, only: gwstress |
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USE suphec_m |
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USE yoegwd |
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use gwprofil_m, only: gwprofil |
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use orosetup_m, only: orosetup |
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|
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!**** *gwdrag* - does the gravity wave parametrization. |
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|
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! purpose. |
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|
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! this routine computes the physical tendencies of the |
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! prognostic variables u, v and t due to vertical transports by |
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! subgridscale orographically excited gravity waves |
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|
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!** interface. |
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|
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! called from *callpar*. |
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|
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! the routine takes its input from the long-term storage: |
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! u, v, t and p at t-1. |
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|
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! explicit arguments : |
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|
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! ==== inputs === |
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! ==== outputs === |
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|
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! implicit arguments : none |
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|
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! implicit logical (l) |
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|
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! method. |
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|
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! reference. |
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|
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! author. |
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|
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! m.miller + b.ritter e.c.m.w.f. 15/06/86. |
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|
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! f.lott + m. miller e.c.m.w.f. 22/11/94 |
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|
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!* 0.1 arguments |
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|
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INTEGER nlon, nlev |
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INTEGER jl, ilevp1, jk, ji |
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REAL zdelp, ztemp, zforc, ztend |
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REAL rover, zb, zc, zconb, zabsv |
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REAL zzd1, ratio, zbet, zust, zvst, zdis |
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REAL pte(nlon, nlev), pvol(nlon, nlev), pvom(nlon, nlev), pulow(klon), & |
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pvlow(klon) |
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REAL pum1(nlon, nlev), pvm1(nlon, nlev), ptm1(nlon, nlev), pmea(nlon) |
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REAL, INTENT (IN) :: pstd(nlon) |
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REAL, INTENT (IN) :: psig(nlon) |
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REAL pgamma(nlon), ptheta(nlon), ppic(nlon), pval(nlon), & |
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pgeom1(nlon, nlev), papm1(nlon, nlev), paphm1(nlon, nlev+1) |
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|
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INTEGER ktest(nlon) |
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|
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!* 0.2 local arrays |
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|
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INTEGER icrit(klon), ikcrith(klon), ikenvh(klon), & |
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iknu(klon), iknu2(klon), ikcrit(klon) |
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|
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REAL ztau(klon, klev+1), zstab(klon, klev+1), & |
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zvph(klon, klev+1), zrho(klon, klev+1), zri(klon, klev+1), & |
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zpsi(klon, klev+1), zzdep(klon, klev) |
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REAL zdudt(klon), zdvdt(klon), zvidis(klon), & |
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znu(klon), zd1(klon), zd2(klon), zdmod(klon) |
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REAL ztmst |
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REAL, INTENT (IN) :: ptsphy |
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|
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!------------------------------------------------------------------ |
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|
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!* 1. initialization |
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|
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!* 1.1 computational constants |
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|
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ztmst = ptsphy |
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|
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!* 1.3 check whether row contains point for printing |
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|
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!* 2. precompute basic state variables. |
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|
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!* define low level wind, project winds in plane of |
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!* low level wind, determine sector in which to take |
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!* the variance and set indicator for critical levels. |
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|
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CALL orosetup(nlon, ktest, ikcrit, ikcrith, icrit, ikenvh, iknu, iknu2, & |
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paphm1, papm1, pum1, pvm1, ptm1, pgeom1, zrho, zri, zstab, ztau, & |
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zvph, zpsi, zzdep, pulow, pvlow, ptheta, pgamma, pmea, ppic, pval, & |
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znu, zd1, zd2, zdmod) |
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|
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!* 3. compute low level stresses using subcritical and |
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!* supercritical forms.computes anisotropy coefficient |
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!* as measure of orographic twodimensionality. |
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|
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CALL gwstress(nlon, nlev, ktest, ikenvh, zrho, zstab, zvph, pstd, & |
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psig, pmea, ppic, ztau, pgeom1, zdmod) |
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|
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!* 4. compute stress profile. |
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|
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CALL gwprofil(nlon, nlev, ktest, ikcrith, icrit, paphm1, zrho, zstab, & |
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zvph, zri, ztau, zdmod, psig, pstd) |
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|
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!* 5. compute tendencies. |
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|
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! explicit solution at all levels for the gravity wave |
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! implicit solution for the blocked levels |
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|
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DO jl = 1, klon |
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zvidis(jl) = 0.0 |
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zdudt(jl) = 0.0 |
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zdvdt(jl) = 0.0 |
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end DO |
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|
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ilevp1 = klev + 1 |
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|
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DO jk = 1, klev |
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|
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! Modif vectorisation 02/04/2004 |
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DO ji = 1, klon |
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IF (ktest(ji)==1) THEN |
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|
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zdelp = paphm1(ji, jk+1) - paphm1(ji, jk) |
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ztemp = -rg*(ztau(ji, jk+1)-ztau(ji, jk))/(zvph(ji, ilevp1)*zdelp) |
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zdudt(ji) = (pulow(ji)*zd1(ji)-pvlow(ji)*zd2(ji))*ztemp/zdmod(ji) |
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zdvdt(ji) = (pvlow(ji)*zd1(ji)+pulow(ji)*zd2(ji))*ztemp/zdmod(ji) |
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|
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! controle des overshoots: |
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|
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zforc = sqrt(zdudt(ji)**2+zdvdt(ji)**2) + 1.E-12 |
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ztend = sqrt(pum1(ji, jk)**2+pvm1(ji, jk)**2)/ztmst + 1.E-12 |
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rover = 0.25 |
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IF (zforc>=rover*ztend) THEN |
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zdudt(ji) = rover*ztend/zforc*zdudt(ji) |
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zdvdt(ji) = rover*ztend/zforc*zdvdt(ji) |
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END IF |
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|
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! fin du controle des overshoots |
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|
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IF (jk>=ikenvh(ji)) THEN |
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zb = 1.0 - 0.18*pgamma(ji) - 0.04*pgamma(ji)**2 |
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zc = 0.48*pgamma(ji) + 0.3*pgamma(ji)**2 |
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zconb = 2.*ztmst*gkwake*psig(ji)/(4.*pstd(ji)) |
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zabsv = sqrt(pum1(ji, jk)**2+pvm1(ji, jk)**2)/2. |
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zzd1 = zb*cos(zpsi(ji, jk))**2 + zc*sin(zpsi(ji, jk))**2 |
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ratio = (cos(zpsi(ji, jk))**2+pgamma(ji)*sin(zpsi(ji, & |
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jk))**2)/(pgamma(ji)*cos(zpsi(ji, jk))**2+sin(zpsi(ji, jk))**2) |
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zbet = max(0., 2.-1./ratio)*zconb*zzdep(ji, jk)*zzd1*zabsv |
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|
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! simplement oppose au vent |
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|
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zdudt(ji) = -pum1(ji, jk)/ztmst |
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zdvdt(ji) = -pvm1(ji, jk)/ztmst |
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|
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! projection dans la direction de l'axe principal de l'orographie |
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!mod zdudt(ji)=-(pum1(ji, jk)*cos(ptheta(ji)*rpi/180.) |
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!mod * +pvm1(ji, jk)*sin(ptheta(ji)*rpi/180.)) |
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!mod * *cos(ptheta(ji)*rpi/180.)/ztmst |
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!mod zdvdt(ji)=-(pum1(ji, jk)*cos(ptheta(ji)*rpi/180.) |
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!mod * +pvm1(ji, jk)*sin(ptheta(ji)*rpi/180.)) |
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!mod * *sin(ptheta(ji)*rpi/180.)/ztmst |
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zdudt(ji) = zdudt(ji)*(zbet/(1.+zbet)) |
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zdvdt(ji) = zdvdt(ji)*(zbet/(1.+zbet)) |
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END IF |
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pvom(ji, jk) = zdudt(ji) |
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pvol(ji, jk) = zdvdt(ji) |
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zust = pum1(ji, jk) + ztmst*zdudt(ji) |
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zvst = pvm1(ji, jk) + ztmst*zdvdt(ji) |
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zdis = 0.5*(pum1(ji, jk)**2+pvm1(ji, jk)**2-zust**2-zvst**2) |
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zvidis(ji) = zvidis(ji) + zdis*zdelp |
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|
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! ENCORE UN TRUC POUR EVITER LES EXPLOSIONS |
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pte(ji, jk) = 0.0 |
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|
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END IF |
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end DO |
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|
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end DO |
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|
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RETURN |
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END SUBROUTINE orodrag |
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|
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end module orodrag_m |
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