! ! $Id: top_bound_p.F 1910 2013-11-29 08:40:25Z oboucher $ ! SUBROUTINE top_bound_p(vcov,ucov,teta,masse,dt) USE parallel_lmdz IMPLICIT NONE c #include "dimensions.h" #include "paramet.h" #include "comconst.h" #include "comvert.h" #include "comgeom2.h" c .. DISSIPATION LINEAIRE A HAUT NIVEAU, RUN MESO, C F. LOTT DEC. 2006 c ( 10/12/06 ) c======================================================================= c c Auteur: F. LOTT c ------- c c Objet: c ------ c c Dissipation linéaire (ex top_bound de la physique) c c======================================================================= ! top_bound sponge layer model: ! Quenching is modeled as: A(t)=Am+A0*exp(-lambda*t) ! where Am is the zonal average of the field (or zero), and lambda the inverse ! of the characteristic quenching/relaxation time scale ! Thus, assuming Am to be time-independent, field at time t+dt is given by: ! A(t+dt)=A(t)-(A(t)-Am)*(1-exp(-lambda*t)) ! Moreover lambda can be a function of model level (see below), and relaxation ! can be toward the average zonal field or just zero (see below). ! NB: top_bound sponge is only called from leapfrog if ok_strato=.true. ! sponge parameters: (loaded/set in conf_gcm.F ; stored in comconst.h) ! iflag_top_bound=0 for no sponge ! iflag_top_bound=1 for sponge over 4 topmost layers ! iflag_top_bound=2 for sponge from top to ~1% of top layer pressure ! mode_top_bound=0: no relaxation ! mode_top_bound=1: u and v relax towards 0 ! mode_top_bound=2: u and v relax towards their zonal mean ! mode_top_bound=3: u,v and pot. temp. relax towards their zonal mean ! tau_top_bound : inverse of charactericstic relaxation time scale at ! the topmost layer (Hz) #include "comdissipn.h" #include "iniprint.h" c Arguments: c ---------- real,intent(inout) :: ucov(iip1,jjp1,llm) ! covariant zonal wind real,intent(inout) :: vcov(iip1,jjm,llm) ! covariant meridional wind real,intent(inout) :: teta(iip1,jjp1,llm) ! potential temperature real,intent(in) :: masse(iip1,jjp1,llm) ! mass of atmosphere real,intent(in) :: dt ! time step (s) of sponge model c Local: c ------ REAL massebx(iip1,jjp1,llm),masseby(iip1,jjm,llm),zm REAL uzon(jjp1,llm),vzon(jjm,llm),tzon(jjp1,llm) integer i REAL,SAVE :: rdamp(llm) ! quenching coefficient real,save :: lambda(llm) ! inverse or quenching time scale (Hz) LOGICAL,SAVE :: first=.true. INTEGER j,l,jjb,jje if (iflag_top_bound == 0) return if (first) then c$OMP BARRIER c$OMP MASTER if (iflag_top_bound == 1) then ! sponge quenching over the topmost 4 atmospheric layers lambda(:)=0. lambda(llm)=tau_top_bound lambda(llm-1)=tau_top_bound/2. lambda(llm-2)=tau_top_bound/4. lambda(llm-3)=tau_top_bound/8. else if (iflag_top_bound == 2) then ! sponge quenching over topmost layers down to pressures which are ! higher than 100 times the topmost layer pressure lambda(:)=tau_top_bound s *max(presnivs(llm)/presnivs(:)-0.01,0.) endif ! quenching coefficient rdamp(:) ! rdamp(:)=dt*lambda(:) ! Explicit Euler approx. rdamp(:)=1.-exp(-lambda(:)*dt) write(lunout,*)'TOP_BOUND mode',mode_top_bound write(lunout,*)'Sponge layer coefficients' write(lunout,*)'p (Pa) z(km) tau(s) 1./tau (Hz)' do l=1,llm if (rdamp(l).ne.0.) then write(lunout,'(6(1pe12.4,1x))') & presnivs(l),log(preff/presnivs(l))*scaleheight, & 1./lambda(l),lambda(l) endif enddo first=.false. c$OMP END MASTER c$OMP BARRIER endif ! of if (first) CALL massbar_p(masse,massebx,masseby) ! compute zonal average of vcov (or set it to zero) if (mode_top_bound.ge.2) then jjb=jj_begin jje=jj_end IF (pole_sud) jje=jj_end-1 c$OMP DO SCHEDULE(STATIC,OMP_CHUNK) do l=1,llm do j=jjb,jje zm=0. vzon(j,l)=0 do i=1,iim ! NB: we can work using vcov zonal mean rather than v since the ! cv coefficient (which relates the two) only varies with latitudes vzon(j,l)=vzon(j,l)+vcov(i,j,l)*masseby(i,j,l) zm=zm+masseby(i,j,l) enddo vzon(j,l)=vzon(j,l)/zm enddo enddo c$OMP END DO NOWAIT else c$OMP DO SCHEDULE(STATIC,OMP_CHUNK) do l=1,llm vzon(:,l)=0. enddo c$OMP END DO NOWAIT endif ! of if (mode_top_bound.ge.2) ! compute zonal average of u (or set it to zero) if (mode_top_bound.ge.2) then jjb=jj_begin jje=jj_end IF (pole_nord) jjb=jj_begin+1 IF (pole_sud) jje=jj_end-1 c$OMP DO SCHEDULE(STATIC,OMP_CHUNK) do l=1,llm do j=jjb,jje uzon(j,l)=0. zm=0. do i=1,iim uzon(j,l)=uzon(j,l)+massebx(i,j,l)*ucov(i,j,l)/cu(i,j) zm=zm+massebx(i,j,l) enddo uzon(j,l)=uzon(j,l)/zm enddo enddo c$OMP END DO NOWAIT else c$OMP DO SCHEDULE(STATIC,OMP_CHUNK) do l=1,llm uzon(:,l)=0. enddo c$OMP END DO NOWAIT endif ! of if (mode_top_bound.ge.2) ! compute zonal average of potential temperature, if necessary if (mode_top_bound.ge.3) then jjb=jj_begin jje=jj_end IF (pole_nord) jjb=jj_begin+1 IF (pole_sud) jje=jj_end-1 c$OMP DO SCHEDULE(STATIC,OMP_CHUNK) do l=1,llm do j=jjb,jje zm=0. tzon(j,l)=0. do i=1,iim tzon(j,l)=tzon(j,l)+teta(i,j,l)*masse(i,j,l) zm=zm+masse(i,j,l) enddo tzon(j,l)=tzon(j,l)/zm enddo enddo c$OMP END DO NOWAIT endif ! of if (mode_top_bound.ge.3) if (mode_top_bound.ge.1) then ! Apply sponge quenching on vcov: jjb=jj_begin jje=jj_end IF (pole_sud) jje=jj_end-1 c$OMP DO SCHEDULE(STATIC,OMP_CHUNK) do l=1,llm do j=jjb,jje do i=1,iip1 vcov(i,j,l)=vcov(i,j,l) & -rdamp(l)*(vcov(i,j,l)-vzon(j,l)) enddo enddo enddo c$OMP END DO NOWAIT ! Apply sponge quenching on ucov: jjb=jj_begin jje=jj_end IF (pole_nord) jjb=jj_begin+1 IF (pole_sud) jje=jj_end-1 c$OMP DO SCHEDULE(STATIC,OMP_CHUNK) do l=1,llm do j=jjb,jje do i=1,iip1 ucov(i,j,l)=ucov(i,j,l) & -rdamp(l)*(ucov(i,j,l)-cu(i,j)*uzon(j,l)) enddo enddo enddo c$OMP END DO NOWAIT endif ! of if (mode_top_bound.ge.1) if (mode_top_bound.ge.3) then ! Apply sponge quenching on teta: jjb=jj_begin jje=jj_end IF (pole_nord) jjb=jj_begin+1 IF (pole_sud) jje=jj_end-1 c$OMP DO SCHEDULE(STATIC,OMP_CHUNK) do l=1,llm do j=jjb,jje do i=1,iip1 teta(i,j,l)=teta(i,j,l) & -rdamp(l)*(teta(i,j,l)-tzon(j,l)) enddo enddo enddo c$OMP END DO NOWAIT endif ! of if (mode_top_bond.ge.3) END