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guez |
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SUBROUTINE gwstress(nlon,nlev,ktest,kcrit,kkenvh,kknu,prho,pstab,pvph, & |
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pstd,psig,pmea,ppic,ptau,pgeom1,pdmod) |
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!**** *gwstress* |
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! purpose. |
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! -------- |
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!** interface. |
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! ---------- |
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! call *gwstress* from *gwdrag* |
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! explicit arguments : |
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! -------------------- |
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! ==== inputs === |
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! ==== outputs === |
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! implicit arguments : none |
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! -------------------- |
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! method. |
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! ------- |
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! externals. |
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! ---------- |
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! reference. |
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! ---------- |
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! see ecmwf research department documentation of the "i.f.s." |
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! author. |
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! ------- |
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! modifications. |
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! -------------- |
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! f. lott put the new gwd on ifs 22/11/93 |
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!----------------------------------------------------------------------- |
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USE dimens_m |
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USE dimphy |
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USE yomcst |
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USE yoegwd |
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IMPLICIT NONE |
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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 kcrit(nlon), ktest(nlon), kkenvh(nlon), kknu(nlon) |
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REAL prho(nlon,nlev+1), pstab(nlon,nlev+1), ptau(nlon,nlev+1), & |
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pvph(nlon,nlev+1), pgeom1(nlon,nlev) |
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REAL, INTENT (IN) :: pstd(nlon) |
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REAL, INTENT (IN) :: psig(nlon) |
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REAL pmea(nlon), ppic(nlon) |
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REAL pdmod(nlon) |
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!----------------------------------------------------------------------- |
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!* 0.2 local arrays |
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! ------------ |
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INTEGER jl |
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REAL zblock, zvar, zeff |
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LOGICAL lo |
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!----------------------------------------------------------------------- |
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!* 0.3 functions |
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! --------- |
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! ------------------------------------------------------------------ |
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!* 1. initialization |
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! -------------- |
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100 CONTINUE |
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!* 3.1 gravity wave stress. |
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300 CONTINUE |
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DO 301 jl = 1, klon |
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IF (ktest(jl)==1) THEN |
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! effective mountain height above the blocked flow |
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IF (kkenvh(jl)==klev) THEN |
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zblock = 0.0 |
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ELSE |
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zblock = (pgeom1(jl,kkenvh(jl))+pgeom1(jl,kkenvh(jl)+1))/2./rg |
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END IF |
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zvar = ppic(jl) - pmea(jl) |
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zeff = amax1(0.,zvar-zblock) |
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ptau(jl,klev+1) = prho(jl,klev+1)*gkdrag*psig(jl)*zeff**2/4./ & |
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pstd(jl)*pvph(jl,klev+1)*pdmod(jl)*sqrt(pstab(jl,klev+1)) |
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! too small value of stress or low level flow include critical level |
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! or low level flow: gravity wave stress nul. |
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lo = (ptau(jl,klev+1)<gtsec) .OR. (kcrit(jl)>=kknu(jl)) .OR. & |
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(pvph(jl,klev+1)<gvcrit) |
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! if(lo) ptau(jl,klev+1)=0.0 |
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ELSE |
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ptau(jl,klev+1) = 0.0 |
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END IF |
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301 CONTINUE |
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RETURN |
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END |
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