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jmc |
1.2 |
! $Header: /u/gcmpack/MITgcm/pkg/atm_phys/lscale_cond_mod.F90,v 1.1 2013/05/08 22:14:14 jmc Exp $ |
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jmc |
1.1 |
! $Name: $ |
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module lscale_cond_mod |
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!----------------------------------------------------------------------- |
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!use fms_mod, only: file_exist, error_mesg, open_file, & |
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! check_nml_error, mpp_pe, FATAL, & |
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! close_file |
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use simple_sat_vapor_pres_mod, only: escomp, descomp |
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use constants_mod, only: HLv,HLs,Cp_air,Grav,rdgas,rvgas |
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use gcm_params_mod, only: gcm_LEN_MBUF, gcm_SQZ_R, gcm_stdMsgUnit |
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implicit none |
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private |
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!----------------------------------------------------------------------- |
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! ---- public interfaces ---- |
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public lscale_cond, lscale_cond_init |
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!----------------------------------------------------------------------- |
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! ---- version number ---- |
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jmc |
1.2 |
character(len=128) :: version = '$Id: lscale_cond_mod.F90,v 1.1 2013/05/08 22:14:14 jmc Exp $' |
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jmc |
1.1 |
character(len=128) :: tag = '$Name: $' |
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!----------------------------------------------------------------------- |
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! ---- local/private data ---- |
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real, parameter :: d622 = rdgas/rvgas |
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real, parameter :: d378 = 1.-d622 |
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logical :: do_init=.true. |
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!----------------------------------------------------------------------- |
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! --- namelist ---- |
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real :: hc=1.00 |
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logical :: do_evap=.false. |
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namelist /lscale_cond_nml/ hc, do_evap |
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!----------------------------------------------------------------------- |
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! description of namelist variables |
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! |
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! hc = relative humidity at which large scale condensation |
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! occurs, where 0 <= hc <= 1 (default: hc=1.) |
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! |
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! do_evap = flag for the re-evaporation of moisture in |
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! sub-saturated layers below, if do_evap=.true. then |
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! re-evaporation is performed (default: do_evap=.false.) |
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! |
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!----------------------------------------------------------------------- |
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contains |
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!####################################################################### |
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! subroutine lscale_cond (tin, qin, pfull, phalf, coldT, & |
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! rain, snow, tdel, qdel, mask, conv) |
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subroutine lscale_cond (tin, qin, pfull, phalf, coldT, & |
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rain, snow, tdel, qdel, qsat, & |
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myThid, mask, conv ) |
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!----------------------------------------------------------------------- |
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! |
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! large scale condensation |
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! |
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!----------------------------------------------------------------------- |
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! |
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! input: tin temperature at full model levels |
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! qin specific humidity of water vapor at full |
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! model levels |
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! pfull pressure at full model levels |
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! phalf pressure at half (interface) model levels |
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! coldT should precipitation be snow at this point? |
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! optional: |
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! mask optional mask (0 or 1.) |
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! conv logical flag; if true then no large-scale |
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! adjustment is performed at that grid-point or |
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! model level |
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! |
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! output: rain liquid precipitation (kg/m2) |
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! snow frozen precipitation (kg/m2) |
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! tdel temperature tendency at full model levels |
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! qdel specific humidity tendency (of water vapor) at |
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! full model levels |
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! qsat saturated specific humidity |
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! |
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!----------------------------------------------------------------------- |
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!--------------------- interface arguments ----------------------------- |
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real , intent(in) , dimension(:,:,:) :: tin, qin, pfull, phalf |
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logical , intent(in) , dimension(:,:):: coldT |
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real , intent(out), dimension(:,:) :: rain,snow |
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real , intent(out), dimension(:,:,:) :: tdel, qdel, qsat |
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integer, intent(in) :: myThid |
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real , intent(in) , dimension(:,:,:), optional :: mask |
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logical, intent(in) , dimension(:,:,:), optional :: conv |
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!----------------------------------------------------------------------- |
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!---------------------- local data ------------------------------------- |
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logical,dimension(size(tin,1),size(tin,2),size(tin,3)) :: do_adjust |
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real,dimension(size(tin,1),size(tin,2),size(tin,3)) :: & |
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esat, desat, dqsat, pmes, pmass |
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real,dimension(size(tin,1),size(tin,2)) :: hlcp, precip |
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integer k, kx |
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!----------------------------------------------------------------------- |
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! computation of precipitation by condensation processes |
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!----------------------------------------------------------------------- |
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! if (do_init) call error_mesg ('lscale_cond', & |
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! 'lscale_cond_init has not been called.', FATAL) |
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kx=size(tin,3) |
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!----- compute proper latent heat -------------------------------------- |
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WHERE (coldT) |
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hlcp = HLs/Cp_air |
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ELSEWHERE |
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hlcp = HLv/Cp_air |
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END WHERE |
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!----- saturation vapor pressure (esat) & specific humidity (qsat) ----- |
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call escomp (tin,esat) |
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call descomp (tin,desat) |
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esat(:,:,:)=esat(:,:,:)*hc |
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where (pfull(:,:,:) > d378*esat(:,:,:)) |
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pmes(:,:,:)=1.0/(pfull(:,:,:)-d378*esat(:,:,:)) |
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qsat(:,:,:)=d622*esat(:,:,:)*pmes(:,:,:) |
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qsat(:,:,:)=max(0.0,qsat(:,:,:)) |
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dqsat(:,:,:)=d622*pfull(:,:,:)*desat(:,:,:)*pmes(:,:,:)*pmes(:,:,:) |
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elsewhere |
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pmes(:,:,:)=0.0 |
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qsat(:,:,:)=0.0 |
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dqsat(:,:,:)=0.0 |
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endwhere |
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!--------- do adjustment where greater than saturated value ------------ |
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if (present(conv)) then |
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!!!! do_adjust(:,:,:)=(.not.conv(:,:,:) .and. qin(:,:,:) > qsat(:,:,:)) |
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do_adjust(:,:,:)=(.not.conv(:,:,:) .and. & |
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(qin(:,:,:) - qsat(:,:,:))*qsat(:,:,:) > 0.0) |
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else |
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!!!! do_adjust(:,:,:)=(qin(:,:,:) > qsat(:,:,:)) |
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do_adjust(:,:,:)=( (qin(:,:,:) - qsat(:,:,:))*qsat(:,:,:) > 0.0) |
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endif |
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if (present(mask)) then |
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do_adjust(:,:,:)=do_adjust(:,:,:) .and. (mask(:,:,:) > 0.5) |
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end if |
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!----------- compute adjustments to temp and spec humidity ------------- |
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do k = 1,kx |
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where (do_adjust(:,:,k)) |
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qdel(:,:,k)=(qsat(:,:,k)-qin(:,:,k))/(1.0+hlcp(:,:)*dqsat(:,:,k)) |
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tdel(:,:,k)=-hlcp(:,:)*qdel(:,:,k) |
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elsewhere |
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qdel(:,:,k)=0.0 |
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tdel(:,:,k)=0.0 |
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endwhere |
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end do |
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!------------ pressure mass of each layer ------------------------------ |
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do k=1,kx |
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pmass(:,:,k)=(phalf(:,:,k+1)-phalf(:,:,k))/Grav |
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enddo |
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!------------ re-evaporation of precipitation in dry layer below ------- |
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if (do_evap) then |
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if (present(mask)) then |
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! call precip_evap (pmass,tin,qin,qsat,dqsat,hlcp,tdel,qdel,mask) |
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call precip_evap (pmass,tin,qin,qsat,dqsat,hlcp,tdel,qdel, & |
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myThid, mask ) |
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else |
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call precip_evap (pmass,tin,qin,qsat,dqsat,hlcp,tdel,qdel, & |
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myThid ) |
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endif |
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endif |
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!------------ integrate precip ----------------------------------------- |
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precip(:,:)=0.0 |
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do k=1,kx |
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precip(:,:)=precip(:,:)-pmass(:,:,k)*qdel(:,:,k) |
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enddo |
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precip(:,:)=max(precip(:,:),0.0) |
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!assign precip to snow or rain |
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WHERE (coldT) |
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snow = precip |
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rain = 0. |
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ELSEWHERE |
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rain = precip |
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snow = 0. |
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END WHERE |
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!----------------------------------------------------------------------- |
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end subroutine lscale_cond |
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!####################################################################### |
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! subroutine precip_evap (pmass, tin, qin, qsat, dqsat, hlcp, & |
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! tdel, qdel, mask) |
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subroutine precip_evap (pmass, tin, qin, qsat, dqsat, hlcp, & |
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tdel, qdel, myThid, mask ) |
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!----------------------------------------------------------------------- |
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! performs re-evaporation of falling precipitation |
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!----------------------------------------------------------------------- |
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real, intent(in), dimension(:,:,:) :: pmass, tin, qin, qsat, dqsat |
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real, intent(in), dimension(:,:) :: hlcp |
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real, intent(inout), dimension(:,:,:) :: tdel, qdel |
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integer, intent(in) :: myThid |
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real, intent(in), dimension(:,:,:), optional :: mask |
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!----------------------------------------------------------------------- |
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real, dimension(size(tin,1),size(tin,2)) :: exq, def |
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integer k |
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!----------------------------------------------------------------------- |
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exq(:,:)=0.0 |
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do k=1,size(tin,3) |
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where (qdel(:,:,k) < 0.0) exq(:,:) = exq(:,:) - & |
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qdel(:,:,k)*pmass(:,:,k) |
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if (present(mask)) exq(:,:) = exq(:,:)*mask(:,:,k) |
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! ---- evaporate precip where needed ------ |
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where ( (qdel(:,:,k) >= 0.0) .and. (exq(:,:) > 0.0) ) |
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exq(:,:) = exq(:,:) / pmass(:,:,k) |
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def(:,:) = (qsat(:,:,k)-qin(:,:,k))/(1.+hlcp(:,:)*dqsat(:,:,k)) |
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def(:,:) = min(max(def(:,:),0.0),exq(:,:)) |
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qdel(:,:,k) = qdel(:,:,k) + def(:,:) |
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tdel(:,:,k) = tdel(:,:,k) - def(:,:)*hlcp(:,:) |
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exq(:,:) = (exq(:,:)-def(:,:))*pmass(:,:,k) |
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endwhere |
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enddo |
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!----------------------------------------------------------------------- |
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end subroutine precip_evap |
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!####################################################################### |
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subroutine lscale_cond_init (myThid) |
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!----------------------------------------------------------------------- |
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! |
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! initialization for large scale condensation |
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! |
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!----------------------------------------------------------------------- |
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integer, intent(in) :: myThid |
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!----------------------------------------------------------------------- |
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! integer unit,io,ierr |
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integer :: iUnit |
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CHARACTER*(gcm_LEN_MBUF) :: msgBuf |
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!----------- read namelist --------------------------------------------- |
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! _BARRIER |
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! _BEGIN_MASTER(myThid) |
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CALL BARRIER(myThid) |
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IF ( myThid.EQ.1 ) THEN |
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WRITE(msgBuf,'(A)') 'LSCALE_COND_INIT: opening data.atm_gray' |
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CALL PRINT_MESSAGE( msgBuf, gcm_stdMsgUnit, gcm_SQZ_R, myThid ) |
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CALL OPEN_COPY_DATA_FILE( & |
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'data.atm_gray', 'LSCALE_COND_INIT', & |
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iUnit, & |
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myThid ) |
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! Read parameters from open data file |
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READ(UNIT=iUnit,NML=lscale_cond_nml) |
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WRITE(msgBuf,'(A)') & |
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'LSCALE_COND_INIT: finished reading data.atm_gray' |
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CALL PRINT_MESSAGE( msgBuf, gcm_stdMsgUnit, gcm_SQZ_R, myThid ) |
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! Close the open data file |
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jmc |
1.2 |
#ifdef SINGLE_DISK_IO |
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jmc |
1.1 |
CLOSE(iUnit) |
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jmc |
1.2 |
#else |
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CLOSE(iUnit,STATUS='DELETE') |
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#endif /* SINGLE_DISK_IO */ |
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jmc |
1.1 |
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! if (file_exist('input.nml')) then |
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! unit = open_file (file='input.nml', action='read') |
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! ierr=1; do while (ierr /= 0) |
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! read (unit, nml=lscale_cond_nml, iostat=io, end=10) |
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! ierr = check_nml_error (io,'lscale_cond_nml') |
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! enddo |
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! 10 call close_file (unit) |
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! endif |
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!---------- output namelist -------------------------------------------- |
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! unit = open_file (file='logfile.out', action='append') |
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! if ( mpp_pe() == 0 ) then |
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! write (unit,'(/,80("="),/(a))') trim(version), trim(tag) |
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! write (unit,nml=lscale_cond_nml) |
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! endif |
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! call close_file (unit) |
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do_init=.false. |
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ENDIF |
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CALL BARRIER(myThid) |
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end subroutine lscale_cond_init |
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!####################################################################### |
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end module lscale_cond_mod |
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