      subroutine sascnvn(im,ix,km,jcap,delt,delp,prslp,psp,phil,ql,
     &     q1,t1,u1,v1,cldwrk,rn,kbot,ktop,kcnv,islimsk,
     &     dot,ncloud,ud_mf,dd_mf,dt_mf,cnvw,cnvc)
!    &     q1,t1,u1,v1,rcs,cldwrk,rn,kbot,ktop,kcnv,islimsk,
!    &     dot,ncloud,ud_mf,dd_mf,dt_mf,me)
!
      use machine , only : kind_phys
      use funcphys , only : fpvs
      use physcons, grav => con_g, cp => con_cp, hvap => con_hvap
     &,             rv => con_rv, fv => con_fvirt, t0c => con_t0c
     &,             cvap => con_cvap, cliq => con_cliq
     &,             eps => con_eps, epsm1 => con_epsm1
      implicit none
!
      integer            im, ix,  km, jcap, ncloud,
     &                   kbot(im), ktop(im), kcnv(im) 
!    &,                  me
      real(kind=kind_phys) delt
      real(kind=kind_phys) psp(im),    delp(ix,km), prslp(ix,km)
      real(kind=kind_phys) ps(im),     del(ix,km),  prsl(ix,km),
     &                     ql(ix,km,2),q1(ix,km),   t1(ix,km),
     &                     u1(ix,km),  v1(ix,km),
!    &                     u1(ix,km),  v1(ix,km),   rcs(im),
     &                     cldwrk(im), rn(im),       
     &                     dot(ix,km), phil(ix,km), 
     &                     cnvw(ix,km), cnvc(ix,km),
! hchuang code change mass flux output
     &                     ud_mf(im,km),dd_mf(im,km),dt_mf(im,km)
!
      integer              i, indx, jmn, k, kk, km1
      integer, dimension(im), intent(in) :: islimsk
!     integer              latd,lond
!
      real(kind=kind_phys) clam, cxlamu, xlamde, xlamdd
! 
!     real(kind=kind_phys) detad
      real(kind=kind_phys) adw,     aup,     aafac,
     &                     beta,    betal,   betas,
     &                     c0,      dellat,  delta,
     &                     desdt,   dg,
     &                     dh,      dhh,     dp,
     &                     dq,      dqsdp,   dqsdt,   dt,
     &                     dt2,     dtmax,   dtmin,   dv1h,
     &                     dv1q,    dv2h,    dv2q,    dv1u,
     &                     dv1v,    dv2u,    dv2v,    dv3q,
     &                     dv3h,    dv3u,    dv3v,
     &                     dz,      dz1,     e1,      edtmax,
     &                     edtmaxl, edtmaxs, el2orc,  elocp,
     &                     es,      etah,    cthk,    dthk,
     &                     evef,    evfact,  evfactl, fact1,
     &                     fact2,   factor,  fjcap,   fkm,
     &                     g,       gamma,   pprime,
     &                     qlk,     qrch,    qs,      c1,
     &                     rain,    rfact,   shear,   tem1,
     &                     val,     val1,
     &                     val2,    w1,      w1l,     w1s,
     &                     w2,      w2l,     w2s,     w3,
     &                     w3l,     w3s,     w4,      w4l,
     &                     w4s,     xdby,    xpw,     xpwd,
     &                     xqrch,   mbdt,    tem,
     &                     ptem,    ptem1,   pgcon
!
      integer              kb(im), kbcon(im), kbcon1(im),
     &                     ktcon(im), ktcon1(im),
     &                     jmin(im), lmin(im), kbmax(im),
     &                     kbm(im), kmax(im)
!
      real(kind=kind_phys) aa1(im),     acrt(im),   acrtfct(im),
     &                     delhbar(im), delq(im),   delq2(im),
     &                     delqbar(im), delqev(im), deltbar(im),
     &                     deltv(im),   dtconv(im), edt(im),
     &                     edto(im),    edtx(im),   fld(im),
     &                     hcdo(im,km), hmax(im),   hmin(im), 
     &                     ucdo(im,km), vcdo(im,km),aa2(im),
     &                     pbcdif(im),  pdot(im),   po(im,km),
     &                     pwavo(im),   pwevo(im),  xlamud(im),
     &                     qcdo(im,km), qcond(im),  qevap(im),
     &                     rntot(im),   vshear(im), xaa0(im),
     &                     xk(im),      xlamd(im),
     &                     xmb(im),     xmbmax(im), xpwav(im),
     &                     xpwev(im),   delubar(im),delvbar(im)
cj
      real(kind=kind_phys) cincr, cincrmax, cincrmin
cj
c  physical parameters
      parameter(g=grav)
      parameter(elocp=hvap/cp,
     &          el2orc=hvap*hvap/(rv*cp))
      parameter(c0=.002,c1=.002,delta=fv)
      parameter(fact1=(cvap-cliq)/rv,fact2=hvap/rv-fact1*t0c)
      parameter(cthk=150.,cincrmax=180.,cincrmin=120.,dthk=25.)
c  local variables and arrays
      real(kind=kind_phys) pfld(im,km),    to(im,km),     qo(im,km),
     &                     uo(im,km),      vo(im,km),     qeso(im,km)
c  cloud water
!     real(kind=kind_phys) tvo(im,km)
      real(kind=kind_phys) qlko_ktcon(im), dellal(im,km), tvo(im,km),
     &                     dbyo(im,km),    zo(im,km),     xlamue(im,km),
     &                     fent1(im,km),   fent2(im,km),  frh(im,km),
     &                     heo(im,km),     heso(im,km),
     &                     qrcd(im,km),    dellah(im,km), dellaq(im,km),
     &                     dellau(im,km),  dellav(im,km), hcko(im,km),
     &                     ucko(im,km),    vcko(im,km),   qcko(im,km),
     &                     eta(im,km),     etad(im,km),   zi(im,km),
     &                     qrcko(im,km),   qrcdo(im,km),
     &                     pwo(im,km),     pwdo(im,km),
     &                     tx1(im),        sumx(im),      cnvwt(im,km)
!    &,                    rhbar(im)
!
      logical totflg, cnvflg(im), flg(im)
!
      real(kind=kind_phys) pcrit(15), acritt(15), acrit(15)
!     save pcrit, acritt
      data pcrit/850.,800.,750.,700.,650.,600.,550.,500.,450.,400.,
     &           350.,300.,250.,200.,150./
      data acritt/.0633,.0445,.0553,.0664,.075,.1082,.1521,.2216,
     &           .3151,.3677,.41,.5255,.7663,1.1686,1.6851/
c  gdas derived acrit
c     data acritt/.203,.515,.521,.566,.625,.665,.659,.688,
c    &            .743,.813,.886,.947,1.138,1.377,1.896/
      real(kind=kind_phys) tf, tcr, tcrf
      parameter (tf=233.16, tcr=263.16, tcrf=1.0/(tcr-tf))
!
c-----------------------------------------------------------------------
!
!************************************************************************
!     convert input pa terms to cb terms  -- moorthi
      ps   = psp   * 0.001
      prsl = prslp * 0.001
      del  = delp  * 0.001
!************************************************************************
!
!
      km1 = km - 1
c
c  initialize arrays
c
      do i=1,im
        cnvflg(i) = .true.
        rn(i)=0.
        kbot(i)=km+1
        ktop(i)=0
        kbcon(i)=km
        ktcon(i)=1
        dtconv(i) = 3600.
        cldwrk(i) = 0.
        pdot(i) = 0.
        pbcdif(i)= 0.
        lmin(i) = 1
        jmin(i) = 1
        qlko_ktcon(i) = 0.
        edt(i)  = 0.
        edto(i) = 0.
        edtx(i) = 0.
        acrt(i) = 0.
        acrtfct(i) = 1.
        aa1(i)  = 0.
        aa2(i)  = 0.
        xaa0(i) = 0.
        pwavo(i)= 0.
        pwevo(i)= 0.
        xpwav(i)= 0.
        xpwev(i)= 0.
        vshear(i) = 0.
      enddo
      do k = 1, km
        do i = 1, im
          cnvw(i,k) = 0.
          cnvc(i,k) = 0.
        enddo
      enddo

! hchuang code change
      do k = 1, km
        do i = 1, im
          ud_mf(i,k) = 0.
          dd_mf(i,k) = 0.
          dt_mf(i,k) = 0.
        enddo
      enddo
c
      do k = 1, 15
        acrit(k) = acritt(k) * (975. - pcrit(k))
      enddo
      dt2 = delt
      val   =         1200.
      dtmin = max(dt2, val )
      val   =         3600.
      dtmax = max(dt2, val )
c  model tunable parameters are all here
      mbdt    = 10.
      edtmaxl = .3
      edtmaxs = .3
      clam    = .1
      aafac   = .1
!     betal   = .15
!     betas   = .15
      betal   = .05
      betas   = .05
c     evef    = 0.07
      evfact  = 0.3
      evfactl = 0.3
!
      cxlamu  = 1.0e-4
      xlamde  = 1.0e-4
      xlamdd  = 1.0e-4
!
!     pgcon   = 0.7     ! gregory et al. (1997, qjrms)
      pgcon   = 0.55    ! zhang & wu (2003,jas)
      fjcap   = (float(jcap) / 126.) ** 2
      val     =           1.
      fjcap   = max(fjcap,val)
      fkm     = (float(km) / 28.) ** 2
      fkm     = max(fkm,val)
      w1l     = -8.e-3 
      w2l     = -4.e-2
      w3l     = -5.e-3 
      w4l     = -5.e-4
      w1s     = -2.e-4
      w2s     = -2.e-3
      w3s     = -1.e-3
      w4s     = -2.e-5
c
c  define top layer for search of the downdraft originating layer
c  and the maximum thetae for updraft
c
      do i=1,im
        kbmax(i) = km
        kbm(i)   = km
        kmax(i)  = km
        tx1(i)   = 1.0 / ps(i)
      enddo
!     
      do k = 1, km
        do i=1,im
          if (prsl(i,k)*tx1(i) .gt. 0.04) kmax(i)  = k + 1
          if (prsl(i,k)*tx1(i) .gt. 0.45) kbmax(i) = k + 1
          if (prsl(i,k)*tx1(i) .gt. 0.70) kbm(i)   = k + 1
        enddo
      enddo
      do i=1,im
        kmax(i)  = min(km,kmax(i))
        kbmax(i) = min(kbmax(i),kmax(i))
        kbm(i)   = min(kbm(i),kmax(i))
      enddo
c
c  hydrostatic height assume zero terr and initially assume
c    updraft entrainment rate as an inverse function of height 
c
      do k = 1, km
        do i=1,im
          zo(i,k) = phil(i,k) / g
        enddo
      enddo
      do k = 1, km1
        do i=1,im
          zi(i,k) = 0.5*(zo(i,k)+zo(i,k+1))
          xlamue(i,k) = clam / zi(i,k)
        enddo
      enddo
c
c!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
c   convert surface pressure to mb from cb
c
      do k = 1, km
        do i = 1, im
          if (k .le. kmax(i)) then
            pfld(i,k) = prsl(i,k) * 10.0
            eta(i,k)  = 1.
            fent1(i,k)= 1.
            fent2(i,k)= 1.
            frh(i,k)  = 0.
            hcko(i,k) = 0.
            qcko(i,k) = 0.
            qrcko(i,k)= 0.
            ucko(i,k) = 0.
            vcko(i,k) = 0.
            etad(i,k) = 1.
            hcdo(i,k) = 0.
            qcdo(i,k) = 0.
            ucdo(i,k) = 0.
            vcdo(i,k) = 0.
            qrcd(i,k) = 0.
            qrcdo(i,k)= 0.
            dbyo(i,k) = 0.
            pwo(i,k)  = 0.
            pwdo(i,k) = 0.
            dellal(i,k) = 0.
            to(i,k)   = t1(i,k)
            qo(i,k)   = q1(i,k)
            uo(i,k)   = u1(i,k)
            vo(i,k)   = v1(i,k)
!           uo(i,k)   = u1(i,k) * rcs(i)
!           vo(i,k)   = v1(i,k) * rcs(i)
            cnvwt(i,k)= 0.
          endif
        enddo
      enddo
c
c  column variables
c  p is pressure of the layer (mb)
c  t is temperature at t-dt (k)..tn
c  q is mixing ratio at t-dt (kg/kg)..qn
c  to is temperature at t+dt (k)... this is after advection and turbulan
c  qo is mixing ratio at t+dt (kg/kg)..q1
c
      do k = 1, km
        do i=1,im
          if (k .le. kmax(i)) then
            qeso(i,k) = 0.01 * fpvs(to(i,k))      ! fpvs is in pa
            qeso(i,k) = eps * qeso(i,k) / (pfld(i,k) + epsm1*qeso(i,k))
            val1      =             1.e-8
            qeso(i,k) = max(qeso(i,k), val1)
            val2      =           1.e-10
            qo(i,k)   = max(qo(i,k), val2 )
!           qo(i,k)   = min(qo(i,k),qeso(i,k))
!           tvo(i,k)  = to(i,k) + delta * to(i,k) * qo(i,k)
          endif
        enddo
      enddo
c
c  compute moist static energy
c
      do k = 1, km
        do i=1,im
          if (k .le. kmax(i)) then
!           tem       = g * zo(i,k) + cp * to(i,k)
            tem       = phil(i,k) + cp * to(i,k)
            heo(i,k)  = tem  + hvap * qo(i,k)
            heso(i,k) = tem  + hvap * qeso(i,k)
c           heo(i,k)  = min(heo(i,k),heso(i,k))
          endif
        enddo
      enddo
c
c  determine level with largest moist static energy
c  this is the level where updraft starts
c
      do i=1,im
        hmax(i) = heo(i,1)
        kb(i)   = 1
      enddo
      do k = 2, km
        do i=1,im
          if (k .le. kbm(i)) then
            if(heo(i,k).gt.hmax(i)) then
              kb(i)   = k
              hmax(i) = heo(i,k)
            endif
          endif
        enddo
      enddo
c
      do k = 1, km1
        do i=1,im
          if (k .le. kmax(i)-1) then
            dz      = .5 * (zo(i,k+1) - zo(i,k))
            dp      = .5 * (pfld(i,k+1) - pfld(i,k))
            es      = 0.01 * fpvs(to(i,k+1))      ! fpvs is in pa
            pprime  = pfld(i,k+1) + epsm1 * es
            qs      = eps * es / pprime
            dqsdp   = - qs / pprime
            desdt   = es * (fact1 / to(i,k+1) + fact2 / (to(i,k+1)**2))
            dqsdt   = qs * pfld(i,k+1) * desdt / (es * pprime)
            gamma   = el2orc * qeso(i,k+1) / (to(i,k+1)**2)
            dt      = (g * dz + hvap * dqsdp * dp) / (cp * (1. + gamma))
            dq      = dqsdt * dt + dqsdp * dp
            to(i,k) = to(i,k+1) + dt
            qo(i,k) = qo(i,k+1) + dq
            po(i,k) = .5 * (pfld(i,k) + pfld(i,k+1))
          endif
        enddo
      enddo
!
      do k = 1, km1
        do i=1,im
          if (k .le. kmax(i)-1) then
            qeso(i,k) = 0.01 * fpvs(to(i,k))      ! fpvs is in pa
            qeso(i,k) = eps * qeso(i,k) / (po(i,k) + epsm1*qeso(i,k))
            val1      =             1.e-8
            qeso(i,k) = max(qeso(i,k), val1)
            val2      =           1.e-10
            qo(i,k)   = max(qo(i,k), val2 )
!           qo(i,k)   = min(qo(i,k),qeso(i,k))
            frh(i,k)  = 1. - min(qo(i,k)/qeso(i,k), 1.)
            heo(i,k)  = .5 * g * (zo(i,k) + zo(i,k+1)) +
     &                  cp * to(i,k) + hvap * qo(i,k)
            heso(i,k) = .5 * g * (zo(i,k) + zo(i,k+1)) +
     &                  cp * to(i,k) + hvap * qeso(i,k)
            uo(i,k)   = .5 * (uo(i,k) + uo(i,k+1))
            vo(i,k)   = .5 * (vo(i,k) + vo(i,k+1))
          endif
        enddo
      enddo
c
c  look for the level of free convection as cloud base
c
      do i=1,im
        flg(i)   = .true.
        kbcon(i) = kmax(i)
      enddo
      do k = 1, km1
        do i=1,im
          if (flg(i).and.k.le.kbmax(i)) then
            if(k.gt.kb(i).and.heo(i,kb(i)).gt.heso(i,k)) then
              kbcon(i) = k
              flg(i)   = .false.
            endif
          endif
        enddo
      enddo
c
      do i=1,im
        if(kbcon(i).eq.kmax(i)) cnvflg(i) = .false.
      enddo
!!
      totflg = .true.
      do i=1,im
        totflg = totflg .and. (.not. cnvflg(i))
      enddo
      if(totflg) return
!!
c
c  determine critical convective inhibition
c  as a function of vertical velocity at cloud base.
c
      do i=1,im
        if(cnvflg(i)) then
!         pdot(i)  = 10.* dot(i,kbcon(i))
          pdot(i)  = 0.01 * dot(i,kbcon(i)) ! now dot is in pa/s
        endif
      enddo
      do i=1,im
        if(cnvflg(i)) then
          if(islimsk(i) == 1) then
            w1 = w1l
            w2 = w2l
            w3 = w3l
            w4 = w4l
          else
            w1 = w1s
            w2 = w2s
            w3 = w3s
            w4 = w4s
          endif
          if(pdot(i).le.w4) then
            tem = (pdot(i) - w4) / (w3 - w4)
          elseif(pdot(i).ge.-w4) then
            tem = - (pdot(i) + w4) / (w4 - w3)
          else
            tem = 0.
          endif
          val1    =             -1.
          tem = max(tem,val1)
          val2    =             1.
          tem = min(tem,val2)
          tem = 1. - tem
          tem1= .5*(cincrmax-cincrmin)
          cincr = cincrmax - tem * tem1
          pbcdif(i) = pfld(i,kb(i)) - pfld(i,kbcon(i))
          if(pbcdif(i).gt.cincr) then
             cnvflg(i) = .false.
          endif
        endif
      enddo
!!
      totflg = .true.
      do i=1,im
        totflg = totflg .and. (.not. cnvflg(i))
      enddo
      if(totflg) return
!!
c
c  assume that updraft entrainment rate above cloud base is
c    same as that at cloud base
c
      do k = 2, km1
        do i=1,im
          if(cnvflg(i).and.
     &      (k.gt.kbcon(i).and.k.lt.kmax(i))) then
              xlamue(i,k) = xlamue(i,kbcon(i))
          endif
        enddo
      enddo
c
c  assume the detrainment rate for the updrafts to be same as
c  the entrainment rate at cloud base
c
      do i = 1, im
        if(cnvflg(i)) then
          xlamud(i) = xlamue(i,kbcon(i))
        endif
      enddo
c
c  functions rapidly decreasing with height, mimicking a cloud ensemble
c    (bechtold et al., 2008)
c
      do k = 2, km1
        do i=1,im
          if(cnvflg(i).and.
     &      (k.gt.kbcon(i).and.k.lt.kmax(i))) then
              tem = qeso(i,k)/qeso(i,kbcon(i))
              fent1(i,k) = tem**2
              fent2(i,k) = tem**3
          endif
        enddo
      enddo
c
c  final entrainment rate as the sum of turbulent part and organized entrainment
c    depending on the environmental relative humidity
c    (bechtold et al., 2008)
c
      do k = 2, km1
        do i=1,im
          if(cnvflg(i).and.
     &      (k.ge.kbcon(i).and.k.lt.kmax(i))) then
              tem = cxlamu * frh(i,k) * fent2(i,k)
              xlamue(i,k) = xlamue(i,k)*fent1(i,k) + tem
          endif
        enddo
      enddo
c
c  determine updraft mass flux for the subcloud layers
c
      do k = km1, 1, -1
        do i = 1, im
          if (cnvflg(i)) then
            if(k.lt.kbcon(i).and.k.ge.kb(i)) then
              dz       = zi(i,k+1) - zi(i,k)
              ptem     = 0.5*(xlamue(i,k)+xlamue(i,k+1))-xlamud(i)
              eta(i,k) = eta(i,k+1) / (1. + ptem * dz)
            endif
          endif
        enddo
      enddo
c
c  compute mass flux above cloud base
c
      do k = 2, km1
        do i = 1, im
         if(cnvflg(i))then
           if(k.gt.kbcon(i).and.k.lt.kmax(i)) then
              dz       = zi(i,k) - zi(i,k-1)
              ptem     = 0.5*(xlamue(i,k)+xlamue(i,k-1))-xlamud(i)
              eta(i,k) = eta(i,k-1) * (1 + ptem * dz)
           endif
         endif
        enddo
      enddo
c
c  compute updraft cloud properties
c
      do i = 1, im
        if(cnvflg(i)) then
          indx         = kb(i)
          hcko(i,indx) = heo(i,indx)
          ucko(i,indx) = uo(i,indx)
          vcko(i,indx) = vo(i,indx)
          pwavo(i)     = 0.
        endif
      enddo
c
c  cloud property is modified by the entrainment process
c
      do k = 2, km1
        do i = 1, im
          if (cnvflg(i)) then
            if(k.gt.kb(i).and.k.lt.kmax(i)) then
              dz   = zi(i,k) - zi(i,k-1)
              tem  = 0.5 * (xlamue(i,k)+xlamue(i,k-1)) * dz
              tem1 = 0.5 * xlamud(i) * dz
              factor = 1. + tem - tem1
              ptem = 0.5 * tem + pgcon
              ptem1= 0.5 * tem - pgcon
              hcko(i,k) = ((1.-tem1)*hcko(i,k-1)+tem*0.5*
     &                     (heo(i,k)+heo(i,k-1)))/factor
              ucko(i,k) = ((1.-tem1)*ucko(i,k-1)+ptem*uo(i,k)
     &                     +ptem1*uo(i,k-1))/factor
              vcko(i,k) = ((1.-tem1)*vcko(i,k-1)+ptem*vo(i,k)
     &                     +ptem1*vo(i,k-1))/factor
              dbyo(i,k) = hcko(i,k) - heso(i,k)
            endif
          endif
        enddo
      enddo
c
c   taking account into convection inhibition due to existence of
c    dry layers below cloud base
c
      do i=1,im
        flg(i) = cnvflg(i)
        kbcon1(i) = kmax(i)
      enddo
      do k = 2, km1
      do i=1,im
        if (flg(i).and.k.lt.kmax(i)) then
          if(k.ge.kbcon(i).and.dbyo(i,k).gt.0.) then
            kbcon1(i) = k
            flg(i)    = .false.
          endif
        endif
      enddo
      enddo
      do i=1,im
        if(cnvflg(i)) then
          if(kbcon1(i).eq.kmax(i)) cnvflg(i) = .false.
        endif
      enddo
      do i=1,im
        if(cnvflg(i)) then
          tem = pfld(i,kbcon(i)) - pfld(i,kbcon1(i))
          if(tem.gt.dthk) then
             cnvflg(i) = .false.
          endif
        endif
      enddo
!!
      totflg = .true.
      do i = 1, im
        totflg = totflg .and. (.not. cnvflg(i))
      enddo
      if(totflg) return
!!
c
c  determine first guess cloud top as the level of zero buoyancy
c
      do i = 1, im
        flg(i) = cnvflg(i)
        ktcon(i) = 1
      enddo
      do k = 2, km1
      do i = 1, im
        if (flg(i).and.k .lt. kmax(i)) then
          if(k.gt.kbcon1(i).and.dbyo(i,k).lt.0.) then
             ktcon(i) = k
             flg(i)   = .false.
          endif
        endif
      enddo
      enddo
c
      do i = 1, im
        if(cnvflg(i)) then
          tem = pfld(i,kbcon(i))-pfld(i,ktcon(i))
          if(tem.lt.cthk) cnvflg(i) = .false.
        endif
      enddo
!!
      totflg = .true.
      do i = 1, im
        totflg = totflg .and. (.not. cnvflg(i))
      enddo
      if(totflg) return
!!
c
c  search for downdraft originating level above theta-e minimum
c
      do i = 1, im
        if(cnvflg(i)) then
           hmin(i) = heo(i,kbcon1(i))
           lmin(i) = kbmax(i)
           jmin(i) = kbmax(i)
        endif
      enddo
      do k = 2, km1
        do i = 1, im
          if (cnvflg(i) .and. k .le. kbmax(i)) then
            if(k.gt.kbcon1(i).and.heo(i,k).lt.hmin(i)) then
               lmin(i) = k + 1
               hmin(i) = heo(i,k)
            endif
          endif
        enddo
      enddo
c
c  make sure that jmin(i) is within the cloud
c
      do i = 1, im
        if(cnvflg(i)) then
          jmin(i) = min(lmin(i),ktcon(i)-1)
          jmin(i) = max(jmin(i),kbcon1(i)+1)
          if(jmin(i).ge.ktcon(i)) cnvflg(i) = .false.
        endif
      enddo
c
c  specify upper limit of mass flux at cloud base
c
      do i = 1, im
        if(cnvflg(i)) then
!         xmbmax(i) = .1
!
          k = kbcon(i)
          dp = 1000. * del(i,k)
          xmbmax(i) = dp / (g * dt2)
!
!         tem = dp / (g * dt2)
!         xmbmax(i) = min(tem, xmbmax(i))
        endif
      enddo
c
c  compute cloud moisture property and precipitation
c
      do i = 1, im
        if (cnvflg(i)) then
          aa1(i) = 0.
          qcko(i,kb(i)) = qo(i,kb(i))
          qrcko(i,kb(i)) = qo(i,kb(i))
!         rhbar(i) = 0.
        endif
      enddo
      do k = 2, km1
        do i = 1, im
          if (cnvflg(i)) then
            if(k.gt.kb(i).and.k.lt.ktcon(i)) then
              dz    = zi(i,k) - zi(i,k-1)
              gamma = el2orc * qeso(i,k) / (to(i,k)**2)
              qrch = qeso(i,k)
     &             + gamma * dbyo(i,k) / (hvap * (1. + gamma))
cj
              tem  = 0.5 * (xlamue(i,k)+xlamue(i,k-1)) * dz
              tem1 = 0.5 * xlamud(i) * dz
              factor = 1. + tem - tem1
              qcko(i,k) = ((1.-tem1)*qcko(i,k-1)+tem*0.5*
     &                     (qo(i,k)+qo(i,k-1)))/factor
              qrcko(i,k) = qcko(i,k)
cj
              dq = eta(i,k) * (qcko(i,k) - qrch)
c
!             rhbar(i) = rhbar(i) + qo(i,k) / qeso(i,k)
c
c  check if there is excess moisture to release latent heat
c
              if(k.ge.kbcon(i).and.dq.gt.0.) then
                etah = .5 * (eta(i,k) + eta(i,k-1))
                if(ncloud.gt.0..and.k.gt.jmin(i)) then
                  dp = 1000. * del(i,k)
                  qlk = dq / (eta(i,k) + etah * (c0 + c1) * dz)
                  dellal(i,k) = etah * c1 * dz * qlk * g / dp
                else
                  qlk = dq / (eta(i,k) + etah * c0 * dz)
                endif
                aa1(i) = aa1(i) - dz * g * qlk
                qcko(i,k) = qlk + qrch
                pwo(i,k) = etah * c0 * dz * qlk
                pwavo(i) = pwavo(i) + pwo(i,k)
!               cnvwt(i,k) = (etah*qlk + pwo(i,k)) * g / dp
                cnvwt(i,k) = etah * qlk * g / dp
              endif
            endif
          endif
        enddo
      enddo
c
!     do i = 1, im
!       if(cnvflg(i)) then
!         indx = ktcon(i) - kb(i) - 1
!         rhbar(i) = rhbar(i) / float(indx)
!       endif
!     enddo
c
c  calculate cloud work function
c
      do k = 2, km1
        do i = 1, im
          if (cnvflg(i)) then
            if(k.ge.kbcon(i).and.k.lt.ktcon(i)) then
              dz1 = zo(i,k+1) - zo(i,k)
              gamma = el2orc * qeso(i,k) / (to(i,k)**2)
              rfact =  1. + delta * cp * gamma
     &                 * to(i,k) / hvap
              aa1(i) = aa1(i) +
     &                 dz1 * (g / (cp * to(i,k)))
     &                 * dbyo(i,k) / (1. + gamma)
     &                 * rfact
              val = 0.
              aa1(i)=aa1(i)+
     &                 dz1 * g * delta *
     &                 max(val,(qeso(i,k) - qo(i,k)))
            endif
          endif
        enddo
      enddo
      do i = 1, im
        if(cnvflg(i).and.aa1(i).le.0.) cnvflg(i) = .false.
      enddo
!!
      totflg = .true.
      do i=1,im
        totflg = totflg .and. (.not. cnvflg(i))
      enddo
      if(totflg) return
!!
c
c  estimate the onvective overshooting as the level 
c    where the [aafac * cloud work function] becomes zero,
c    which is the final cloud top
c
      do i = 1, im
        if (cnvflg(i)) then
          aa2(i) = aafac * aa1(i)
        endif
      enddo
c
      do i = 1, im
        flg(i) = cnvflg(i)
        ktcon1(i) = kmax(i) - 1
      enddo
      do k = 2, km1
        do i = 1, im
          if (flg(i)) then
            if(k.ge.ktcon(i).and.k.lt.kmax(i)) then
              dz1 = zo(i,k+1) - zo(i,k)
              gamma = el2orc * qeso(i,k) / (to(i,k)**2)
              rfact =  1. + delta * cp * gamma
     &                 * to(i,k) / hvap
              aa2(i) = aa2(i) +
     &                 dz1 * (g / (cp * to(i,k)))
     &                 * dbyo(i,k) / (1. + gamma)
     &                 * rfact
              if(aa2(i).lt.0.) then
                ktcon1(i) = k
                flg(i) = .false.
              endif
            endif
          endif
        enddo
      enddo
c
c  compute cloud moisture property, detraining cloud water 
c    and precipitation in overshooting layers 
c
      do k = 2, km1
        do i = 1, im
          if (cnvflg(i)) then
            if(k.ge.ktcon(i).and.k.lt.ktcon1(i)) then
              dz    = zi(i,k) - zi(i,k-1)
              gamma = el2orc * qeso(i,k) / (to(i,k)**2)
              qrch = qeso(i,k)
     &             + gamma * dbyo(i,k) / (hvap * (1. + gamma))
cj
              tem  = 0.5 * (xlamue(i,k)+xlamue(i,k-1)) * dz
              tem1 = 0.5 * xlamud(i) * dz
              factor = 1. + tem - tem1
              qcko(i,k) = ((1.-tem1)*qcko(i,k-1)+tem*0.5*
     &                     (qo(i,k)+qo(i,k-1)))/factor
              qrcko(i,k) = qcko(i,k)
cj
              dq = eta(i,k) * (qcko(i,k) - qrch)
c
c  check if there is excess moisture to release latent heat
c
              if(dq.gt.0.) then
                etah = .5 * (eta(i,k) + eta(i,k-1))
                if(ncloud.gt.0.) then
                  dp = 1000. * del(i,k)
                  qlk = dq / (eta(i,k) + etah * (c0 + c1) * dz)
                  dellal(i,k) = etah * c1 * dz * qlk * g / dp
                else
                  qlk = dq / (eta(i,k) + etah * c0 * dz)
                endif
                qcko(i,k) = qlk + qrch
                pwo(i,k) = etah * c0 * dz * qlk
                pwavo(i) = pwavo(i) + pwo(i,k)
!               cnvwt(i,k) = (etah*qlk + pwo(i,k)) * g / dp
                cnvwt(i,k) = etah * qlk * g / dp
              endif
            endif
          endif
        enddo
      enddo
c
c exchange ktcon with ktcon1
c
      do i = 1, im
        if(cnvflg(i)) then
          kk = ktcon(i)
          ktcon(i) = ktcon1(i)
          ktcon1(i) = kk
        endif
      enddo
c
c  this section is ready for cloud water
c
      if(ncloud.gt.0) then
c
c  compute liquid and vapor separation at cloud top
c
      do i = 1, im
        if(cnvflg(i)) then
          k = ktcon(i) - 1
          gamma = el2orc * qeso(i,k) / (to(i,k)**2)
          qrch = qeso(i,k)
     &         + gamma * dbyo(i,k) / (hvap * (1. + gamma))
          dq = qcko(i,k) - qrch
c
c  check if there is excess moisture to release latent heat
c
          if(dq.gt.0.) then
            qlko_ktcon(i) = dq
            qcko(i,k) = qrch
          endif
        endif
      enddo
      endif
c
ccccc if(lat.eq.latd.and.lon.eq.lond.and.cnvflg(i)) then
ccccc   print *, ' aa1(i) before dwndrft =', aa1(i)
ccccc endif
c
c------- downdraft calculations
c
c--- compute precipitation efficiency in terms of windshear
c
      do i = 1, im
        if(cnvflg(i)) then
          vshear(i) = 0.
        endif
      enddo
      do k = 2, km
        do i = 1, im
          if (cnvflg(i)) then
            if(k.gt.kb(i).and.k.le.ktcon(i)) then
              shear= sqrt((uo(i,k)-uo(i,k-1)) ** 2
     &                  + (vo(i,k)-vo(i,k-1)) ** 2)
              vshear(i) = vshear(i) + shear
            endif
          endif
        enddo
      enddo
      do i = 1, im
        if(cnvflg(i)) then
          vshear(i) = 1.e3 * vshear(i) / (zi(i,ktcon(i))-zi(i,kb(i)))
          e1=1.591-.639*vshear(i)
     &       +.0953*(vshear(i)**2)-.00496*(vshear(i)**3)
          edt(i)=1.-e1
          val =         .9
          edt(i) = min(edt(i),val)
          val =         .0
          edt(i) = max(edt(i),val)
          edto(i)=edt(i)
          edtx(i)=edt(i)
        endif
      enddo
c
c  determine detrainment rate between 1 and kbcon
c
      do i = 1, im
        if(cnvflg(i)) then
          sumx(i) = 0.
        endif
      enddo
      do k = 1, km1
      do i = 1, im
        if(cnvflg(i).and.k.ge.1.and.k.lt.kbcon(i)) then
          dz = zi(i,k+1) - zi(i,k)
          sumx(i) = sumx(i) + dz
        endif
      enddo
      enddo
      do i = 1, im
        beta = betas
        if(islimsk(i) == 1) beta = betal
        if(cnvflg(i)) then
          dz  = (sumx(i)+zi(i,1))/float(kbcon(i))
          tem = 1./float(kbcon(i))
          xlamd(i) = (1.-beta**tem)/dz
        endif
      enddo
c
c  determine downdraft mass flux
c
      do k = km1, 1, -1
        do i = 1, im
          if (cnvflg(i) .and. k .le. kmax(i)-1) then
           if(k.lt.jmin(i).and.k.ge.kbcon(i)) then
              dz        = zi(i,k+1) - zi(i,k)
              ptem      = xlamdd - xlamde
              etad(i,k) = etad(i,k+1) * (1. - ptem * dz)
           else if(k.lt.kbcon(i)) then
              dz        = zi(i,k+1) - zi(i,k)
              ptem      = xlamd(i) + xlamdd - xlamde
              etad(i,k) = etad(i,k+1) * (1. - ptem * dz)
           endif
          endif
        enddo
      enddo
c
c--- downdraft moisture properties
c
      do i = 1, im
        if(cnvflg(i)) then
          jmn = jmin(i)
          hcdo(i,jmn) = heo(i,jmn)
          qcdo(i,jmn) = qo(i,jmn)
          qrcdo(i,jmn)= qo(i,jmn)
          ucdo(i,jmn) = uo(i,jmn)
          vcdo(i,jmn) = vo(i,jmn)
          pwevo(i) = 0.
        endif
      enddo
cj
      do k = km1, 1, -1
        do i = 1, im
          if (cnvflg(i) .and. k.lt.jmin(i)) then
              dz = zi(i,k+1) - zi(i,k)
              if(k.ge.kbcon(i)) then
                 tem  = xlamde * dz
                 tem1 = 0.5 * xlamdd * dz
              else
                 tem  = xlamde * dz
                 tem1 = 0.5 * (xlamd(i)+xlamdd) * dz
              endif
              factor = 1. + tem - tem1
              ptem = 0.5 * tem - pgcon
              ptem1= 0.5 * tem + pgcon
              hcdo(i,k) = ((1.-tem1)*hcdo(i,k+1)+tem*0.5*
     &                     (heo(i,k)+heo(i,k+1)))/factor
              ucdo(i,k) = ((1.-tem1)*ucdo(i,k+1)+ptem*uo(i,k+1)
     &                     +ptem1*uo(i,k))/factor
              vcdo(i,k) = ((1.-tem1)*vcdo(i,k+1)+ptem*vo(i,k+1)
     &                     +ptem1*vo(i,k))/factor
              dbyo(i,k) = hcdo(i,k) - heso(i,k)
          endif
        enddo
      enddo
c
      do k = km1, 1, -1
        do i = 1, im
          if (cnvflg(i).and.k.lt.jmin(i)) then
              gamma      = el2orc * qeso(i,k) / (to(i,k)**2)
              qrcdo(i,k) = qeso(i,k)+
     &                (1./hvap)*(gamma/(1.+gamma))*dbyo(i,k)
!             detad      = etad(i,k+1) - etad(i,k)
cj
              dz = zi(i,k+1) - zi(i,k)
              if(k.ge.kbcon(i)) then
                 tem  = xlamde * dz
                 tem1 = 0.5 * xlamdd * dz
              else
                 tem  = xlamde * dz
                 tem1 = 0.5 * (xlamd(i)+xlamdd) * dz
              endif
              factor = 1. + tem - tem1
              qcdo(i,k) = ((1.-tem1)*qrcdo(i,k+1)+tem*0.5*
     &                     (qo(i,k)+qo(i,k+1)))/factor
cj
!             pwdo(i,k)  = etad(i,k+1) * qcdo(i,k+1) -
!    &                     etad(i,k) * qrcdo(i,k)
!             pwdo(i,k)  = pwdo(i,k) - detad *
!    &                    .5 * (qrcdo(i,k) + qrcdo(i,k+1))
cj
              pwdo(i,k)  = etad(i,k) * (qcdo(i,k) - qrcdo(i,k))
              pwevo(i)   = pwevo(i) + pwdo(i,k)
          endif
        enddo
      enddo
c
c--- final downdraft strength dependent on precip
c--- efficiency (edt), normalized condensate (pwav), and
c--- evaporate (pwev)
c
      do i = 1, im
        edtmax = edtmaxl
        if(islimsk(i) == 0) edtmax = edtmaxs
        if(cnvflg(i)) then
          if(pwevo(i).lt.0.) then
            edto(i) = -edto(i) * pwavo(i) / pwevo(i)
            edto(i) = min(edto(i),edtmax)
          else
            edto(i) = 0.
          endif
        endif
      enddo
c
c--- downdraft cloudwork functions
c
      do k = km1, 1, -1
        do i = 1, im
          if (cnvflg(i) .and. k .lt. jmin(i)) then
              gamma = el2orc * qeso(i,k) / to(i,k)**2
              dhh=hcdo(i,k)
              dt=to(i,k)
              dg=gamma
              dh=heso(i,k)
              dz=-1.*(zo(i,k+1)-zo(i,k))
              aa1(i)=aa1(i)+edto(i)*dz*(g/(cp*dt))*((dhh-dh)/(1.+dg))
     &               *(1.+delta*cp*dg*dt/hvap)
              val=0.
              aa1(i)=aa1(i)+edto(i)*
     &        dz*g*delta*max(val,(qeso(i,k)-qo(i,k)))
          endif
        enddo
      enddo
      do i = 1, im
        if(cnvflg(i).and.aa1(i).le.0.) then
           cnvflg(i) = .false.
        endif
      enddo
!!
      totflg = .true.
      do i=1,im
        totflg = totflg .and. (.not. cnvflg(i))
      enddo
      if(totflg) return
!!
c
c--- what would the change be, that a cloud with unit mass
c--- will do to the environment?
c
      do k = 1, km
        do i = 1, im
          if(cnvflg(i) .and. k .le. kmax(i)) then
            dellah(i,k) = 0.
            dellaq(i,k) = 0.
            dellau(i,k) = 0.
            dellav(i,k) = 0.
          endif
        enddo
      enddo
      do i = 1, im
        if(cnvflg(i)) then
          dp = 1000. * del(i,1)
          dellah(i,1) = edto(i) * etad(i,1) * (hcdo(i,1)
     &                   - heo(i,1)) * g / dp
          dellaq(i,1) = edto(i) * etad(i,1) * (qrcdo(i,1)
     &                   - qo(i,1)) * g / dp
          dellau(i,1) = edto(i) * etad(i,1) * (ucdo(i,1)
     &                   - uo(i,1)) * g / dp
          dellav(i,1) = edto(i) * etad(i,1) * (vcdo(i,1)
     &                   - vo(i,1)) * g / dp
        endif
      enddo
c
c--- changed due to subsidence and entrainment
c
      do k = 2, km1
        do i = 1, im
          if (cnvflg(i).and.k.lt.ktcon(i)) then
              aup = 1.
              if(k.le.kb(i)) aup = 0.
              adw = 1.
              if(k.gt.jmin(i)) adw = 0.
              dp = 1000. * del(i,k)
              dz = zi(i,k) - zi(i,k-1)
c
              dv1h = heo(i,k)
              dv2h = .5 * (heo(i,k) + heo(i,k-1))
              dv3h = heo(i,k-1)
              dv1q = qo(i,k)
              dv2q = .5 * (qo(i,k) + qo(i,k-1))
              dv3q = qo(i,k-1)
              dv1u = uo(i,k)
              dv2u = .5 * (uo(i,k) + uo(i,k-1))
              dv3u = uo(i,k-1)
              dv1v = vo(i,k)
              dv2v = .5 * (vo(i,k) + vo(i,k-1))
              dv3v = vo(i,k-1)
c
              tem  = 0.5 * (xlamue(i,k)+xlamue(i,k-1))
              tem1 = xlamud(i)
c
              if(k.le.kbcon(i)) then
                ptem  = xlamde
                ptem1 = xlamd(i)+xlamdd
              else
                ptem  = xlamde
                ptem1 = xlamdd
              endif
cj
              dellah(i,k) = dellah(i,k) +
     &     ((aup*eta(i,k)-adw*edto(i)*etad(i,k))*dv1h
     &    - (aup*eta(i,k-1)-adw*edto(i)*etad(i,k-1))*dv3h
     &    - (aup*tem*eta(i,k-1)+adw*edto(i)*ptem*etad(i,k))*dv2h*dz
     &    +  aup*tem1*eta(i,k-1)*.5*(hcko(i,k)+hcko(i,k-1))*dz
     &    +  adw*edto(i)*ptem1*etad(i,k)*.5*(hcdo(i,k)+hcdo(i,k-1))*dz
     &         ) *g/dp
cj
              dellaq(i,k) = dellaq(i,k) +
     &     ((aup*eta(i,k)-adw*edto(i)*etad(i,k))*dv1q
     &    - (aup*eta(i,k-1)-adw*edto(i)*etad(i,k-1))*dv3q
     &    - (aup*tem*eta(i,k-1)+adw*edto(i)*ptem*etad(i,k))*dv2q*dz
     &    +  aup*tem1*eta(i,k-1)*.5*(qrcko(i,k)+qcko(i,k-1))*dz
     &    +  adw*edto(i)*ptem1*etad(i,k)*.5*(qrcdo(i,k)+qcdo(i,k-1))*dz
     &         ) *g/dp
cj
              dellau(i,k) = dellau(i,k) +
     &     ((aup*eta(i,k)-adw*edto(i)*etad(i,k))*dv1u
     &    - (aup*eta(i,k-1)-adw*edto(i)*etad(i,k-1))*dv3u
     &    - (aup*tem*eta(i,k-1)+adw*edto(i)*ptem*etad(i,k))*dv2u*dz
     &    +  aup*tem1*eta(i,k-1)*.5*(ucko(i,k)+ucko(i,k-1))*dz
     &    +  adw*edto(i)*ptem1*etad(i,k)*.5*(ucdo(i,k)+ucdo(i,k-1))*dz
     &    -  pgcon*(aup*eta(i,k-1)-adw*edto(i)*etad(i,k))*(dv1u-dv3u)
     &         ) *g/dp
cj
              dellav(i,k) = dellav(i,k) +
     &     ((aup*eta(i,k)-adw*edto(i)*etad(i,k))*dv1v
     &    - (aup*eta(i,k-1)-adw*edto(i)*etad(i,k-1))*dv3v
     &    - (aup*tem*eta(i,k-1)+adw*edto(i)*ptem*etad(i,k))*dv2v*dz
     &    +  aup*tem1*eta(i,k-1)*.5*(vcko(i,k)+vcko(i,k-1))*dz
     &    +  adw*edto(i)*ptem1*etad(i,k)*.5*(vcdo(i,k)+vcdo(i,k-1))*dz
     &    -  pgcon*(aup*eta(i,k-1)-adw*edto(i)*etad(i,k))*(dv1v-dv3v)
     &         ) *g/dp
cj
          endif
        enddo
      enddo
c
c------- cloud top
c
      do i = 1, im
        if(cnvflg(i)) then
          indx = ktcon(i)
          dp = 1000. * del(i,indx)
          dv1h = heo(i,indx-1)
          dellah(i,indx) = eta(i,indx-1) *
     &                     (hcko(i,indx-1) - dv1h) * g / dp
          dv1q = qo(i,indx-1)
          dellaq(i,indx) = eta(i,indx-1) *
     &                     (qcko(i,indx-1) - dv1q) * g / dp
          dv1u = uo(i,indx-1)
          dellau(i,indx) = eta(i,indx-1) *
     &                     (ucko(i,indx-1) - dv1u) * g / dp
          dv1v = vo(i,indx-1)
          dellav(i,indx) = eta(i,indx-1) *
     &                     (vcko(i,indx-1) - dv1v) * g / dp
c
c  cloud water
c
          dellal(i,indx) = eta(i,indx-1) *
     &                     qlko_ktcon(i) * g / dp
        endif
      enddo
c
c------- final changed variable per unit mass flux
c
      do k = 1, km
        do i = 1, im
          if (cnvflg(i).and.k .le. kmax(i)) then
            if(k.gt.ktcon(i)) then
              qo(i,k) = q1(i,k)
              to(i,k) = t1(i,k)
            endif
            if(k.le.ktcon(i)) then
              qo(i,k) = dellaq(i,k) * mbdt + q1(i,k)
              dellat = (dellah(i,k) - hvap * dellaq(i,k)) / cp
              to(i,k) = dellat * mbdt + t1(i,k)
              val   =           1.e-10
              qo(i,k) = max(qo(i,k), val  )
            endif
          endif
        enddo
      enddo
c!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
c
c--- the above changed environment is now used to calulate the
c--- effect the arbitrary cloud (with unit mass flux)
c--- would have on the stability,
c--- which then is used to calculate the real mass flux,
c--- necessary to keep this change in balance with the large-scale
c--- destabilization.
c
c--- environmental conditions again, first heights
c
      do k = 1, km
        do i = 1, im
          if(cnvflg(i) .and. k .le. kmax(i)) then
            qeso(i,k) = 0.01 * fpvs(to(i,k))      ! fpvs is in pa
            qeso(i,k) = eps * qeso(i,k) / (pfld(i,k)+epsm1*qeso(i,k))
            val       =             1.e-8
            qeso(i,k) = max(qeso(i,k), val )
!           tvo(i,k)  = to(i,k) + delta * to(i,k) * qo(i,k)
          endif
        enddo
      enddo
c
c--- moist static energy
c
      do k = 1, km1
        do i = 1, im
          if(cnvflg(i) .and. k .le. kmax(i)-1) then
            dz = .5 * (zo(i,k+1) - zo(i,k))
            dp = .5 * (pfld(i,k+1) - pfld(i,k))
            es = 0.01 * fpvs(to(i,k+1))      ! fpvs is in pa
            pprime = pfld(i,k+1) + epsm1 * es
            qs = eps * es / pprime
            dqsdp = - qs / pprime
            desdt = es * (fact1 / to(i,k+1) + fact2 / (to(i,k+1)**2))
            dqsdt = qs * pfld(i,k+1) * desdt / (es * pprime)
            gamma = el2orc * qeso(i,k+1) / (to(i,k+1)**2)
            dt = (g * dz + hvap * dqsdp * dp) / (cp * (1. + gamma))
            dq = dqsdt * dt + dqsdp * dp
            to(i,k) = to(i,k+1) + dt
            qo(i,k) = qo(i,k+1) + dq
            po(i,k) = .5 * (pfld(i,k) + pfld(i,k+1))
          endif
        enddo
      enddo
      do k = 1, km1
        do i = 1, im
          if(cnvflg(i) .and. k .le. kmax(i)-1) then
            qeso(i,k) = 0.01 * fpvs(to(i,k))      ! fpvs is in pa
            qeso(i,k) = eps * qeso(i,k) / (po(i,k) + epsm1 * qeso(i,k))
            val1      =             1.e-8
            qeso(i,k) = max(qeso(i,k), val1)
            val2      =           1.e-10
            qo(i,k)   = max(qo(i,k), val2 )
!           qo(i,k)   = min(qo(i,k),qeso(i,k))
            heo(i,k)   = .5 * g * (zo(i,k) + zo(i,k+1)) +
     &                    cp * to(i,k) + hvap * qo(i,k)
            heso(i,k) = .5 * g * (zo(i,k) + zo(i,k+1)) +
     &                  cp * to(i,k) + hvap * qeso(i,k)
          endif
        enddo
      enddo
      do i = 1, im
        if(cnvflg(i)) then
          k = kmax(i)
          heo(i,k) = g * zo(i,k) + cp * to(i,k) + hvap * qo(i,k)
          heso(i,k) = g * zo(i,k) + cp * to(i,k) + hvap * qeso(i,k)
c         heo(i,k) = min(heo(i,k),heso(i,k))
        endif
      enddo
c
c**************************** static control
c
c------- moisture and cloud work functions
c
      do i = 1, im
        if(cnvflg(i)) then
          xaa0(i) = 0.
          xpwav(i) = 0.
        endif
      enddo
c
      do i = 1, im
        if(cnvflg(i)) then
          indx = kb(i)
          hcko(i,indx) = heo(i,indx)
          qcko(i,indx) = qo(i,indx)
        endif
      enddo
      do k = 2, km1
        do i = 1, im
          if (cnvflg(i)) then
            if(k.gt.kb(i).and.k.le.ktcon(i)) then
              dz = zi(i,k) - zi(i,k-1)
              tem  = 0.5 * (xlamue(i,k)+xlamue(i,k-1)) * dz
              tem1 = 0.5 * xlamud(i) * dz
              factor = 1. + tem - tem1
              hcko(i,k) = ((1.-tem1)*hcko(i,k-1)+tem*0.5*
     &                     (heo(i,k)+heo(i,k-1)))/factor
            endif
          endif
        enddo
      enddo
      do k = 2, km1
        do i = 1, im
          if (cnvflg(i)) then
            if(k.gt.kb(i).and.k.lt.ktcon(i)) then
              dz = zi(i,k) - zi(i,k-1)
              gamma = el2orc * qeso(i,k) / (to(i,k)**2)
              xdby = hcko(i,k) - heso(i,k)
              xqrch = qeso(i,k)
     &              + gamma * xdby / (hvap * (1. + gamma))
cj
              tem  = 0.5 * (xlamue(i,k)+xlamue(i,k-1)) * dz
              tem1 = 0.5 * xlamud(i) * dz
              factor = 1. + tem - tem1
              qcko(i,k) = ((1.-tem1)*qcko(i,k-1)+tem*0.5*
     &                     (qo(i,k)+qo(i,k-1)))/factor
cj
              dq = eta(i,k) * (qcko(i,k) - xqrch)
c
              if(k.ge.kbcon(i).and.dq.gt.0.) then
                etah = .5 * (eta(i,k) + eta(i,k-1))
                if(ncloud.gt.0..and.k.gt.jmin(i)) then
                  qlk = dq / (eta(i,k) + etah * (c0 + c1) * dz)
                else
                  qlk = dq / (eta(i,k) + etah * c0 * dz)
                endif
                if(k.lt.ktcon1(i)) then
                  xaa0(i) = xaa0(i) - dz * g * qlk
                endif
                qcko(i,k) = qlk + xqrch
                xpw = etah * c0 * dz * qlk
                xpwav(i) = xpwav(i) + xpw
              endif
            endif
            if(k.ge.kbcon(i).and.k.lt.ktcon1(i)) then
              dz1 = zo(i,k+1) - zo(i,k)
              gamma = el2orc * qeso(i,k) / (to(i,k)**2)
              rfact =  1. + delta * cp * gamma
     &                 * to(i,k) / hvap
              xaa0(i) = xaa0(i)
     &                + dz1 * (g / (cp * to(i,k)))
     &                * xdby / (1. + gamma)
     &                * rfact
              val=0.
              xaa0(i)=xaa0(i)+
     &                 dz1 * g * delta *
     &                 max(val,(qeso(i,k) - qo(i,k)))
            endif
          endif
        enddo
      enddo
c
c------- downdraft calculations
c
c--- downdraft moisture properties
c
      do i = 1, im
        if(cnvflg(i)) then
          jmn = jmin(i)
          hcdo(i,jmn) = heo(i,jmn)
          qcdo(i,jmn) = qo(i,jmn)
          qrcd(i,jmn) = qo(i,jmn)
          xpwev(i) = 0.
        endif
      enddo
cj
      do k = km1, 1, -1
        do i = 1, im
          if (cnvflg(i) .and. k.lt.jmin(i)) then
              dz = zi(i,k+1) - zi(i,k)
              if(k.ge.kbcon(i)) then
                 tem  = xlamde * dz
                 tem1 = 0.5 * xlamdd * dz
              else
                 tem  = xlamde * dz
                 tem1 = 0.5 * (xlamd(i)+xlamdd) * dz
              endif
              factor = 1. + tem - tem1
              hcdo(i,k) = ((1.-tem1)*hcdo(i,k+1)+tem*0.5*
     &                     (heo(i,k)+heo(i,k+1)))/factor
          endif
        enddo
      enddo
cj
      do k = km1, 1, -1
        do i = 1, im
          if (cnvflg(i) .and. k .lt. jmin(i)) then
              dq = qeso(i,k)
              dt = to(i,k)
              gamma    = el2orc * dq / dt**2
              dh       = hcdo(i,k) - heso(i,k)
              qrcd(i,k)=dq+(1./hvap)*(gamma/(1.+gamma))*dh
!             detad    = etad(i,k+1) - etad(i,k)
cj
              dz = zi(i,k+1) - zi(i,k)
              if(k.ge.kbcon(i)) then
                 tem  = xlamde * dz
                 tem1 = 0.5 * xlamdd * dz
              else
                 tem  = xlamde * dz
                 tem1 = 0.5 * (xlamd(i)+xlamdd) * dz
              endif
              factor = 1. + tem - tem1
              qcdo(i,k) = ((1.-tem1)*qrcd(i,k+1)+tem*0.5*
     &                     (qo(i,k)+qo(i,k+1)))/factor
cj
!             xpwd     = etad(i,k+1) * qcdo(i,k+1) -
!    &                   etad(i,k) * qrcd(i,k)
!             xpwd     = xpwd - detad *
!    &                 .5 * (qrcd(i,k) + qrcd(i,k+1))
cj
              xpwd     = etad(i,k) * (qcdo(i,k) - qrcd(i,k))
              xpwev(i) = xpwev(i) + xpwd
          endif
        enddo
      enddo
c
      do i = 1, im
        edtmax = edtmaxl
        if(islimsk(i) == 0) edtmax = edtmaxs
        if(cnvflg(i)) then
          if(xpwev(i).ge.0.) then
            edtx(i) = 0.
          else
            edtx(i) = -edtx(i) * xpwav(i) / xpwev(i)
            edtx(i) = min(edtx(i),edtmax)
          endif
        endif
      enddo
c
c
c--- downdraft cloudwork functions
c
c
      do k = km1, 1, -1
        do i = 1, im
          if (cnvflg(i) .and. k.lt.jmin(i)) then
              gamma = el2orc * qeso(i,k) / to(i,k)**2
              dhh=hcdo(i,k)
              dt= to(i,k)
              dg= gamma
              dh= heso(i,k)
              dz=-1.*(zo(i,k+1)-zo(i,k))
              xaa0(i)=xaa0(i)+edtx(i)*dz*(g/(cp*dt))*((dhh-dh)/(1.+dg))
     &                *(1.+delta*cp*dg*dt/hvap)
              val=0.
              xaa0(i)=xaa0(i)+edtx(i)*
     &        dz*g*delta*max(val,(qeso(i,k)-qo(i,k)))
          endif
        enddo
      enddo
c
c  calculate critical cloud work function
c
      do i = 1, im
        if(cnvflg(i)) then
          if(pfld(i,ktcon(i)).lt.pcrit(15))then
            acrt(i)=acrit(15)*(975.-pfld(i,ktcon(i)))
     &              /(975.-pcrit(15))
          else if(pfld(i,ktcon(i)).gt.pcrit(1))then
            acrt(i)=acrit(1)
          else
            k =  int((850. - pfld(i,ktcon(i)))/50.) + 2
            k = min(k,15)
            k = max(k,2)
            acrt(i)=acrit(k)+(acrit(k-1)-acrit(k))*
     &           (pfld(i,ktcon(i))-pcrit(k))/(pcrit(k-1)-pcrit(k))
          endif
        endif
      enddo
      do i = 1, im
        if(cnvflg(i)) then
          if(islimsk(i) == 1) then
            w1 = w1l
            w2 = w2l
            w3 = w3l
            w4 = w4l
          else
            w1 = w1s
            w2 = w2s
            w3 = w3s
            w4 = w4s
          endif
c
c  modify critical cloud workfunction by cloud base vertical velocity
c
          if(pdot(i).le.w4) then
            acrtfct(i) = (pdot(i) - w4) / (w3 - w4)
          elseif(pdot(i).ge.-w4) then
            acrtfct(i) = - (pdot(i) + w4) / (w4 - w3)
          else
            acrtfct(i) = 0.
          endif
          val1    =             -1.
          acrtfct(i) = max(acrtfct(i),val1)
          val2    =             1.
          acrtfct(i) = min(acrtfct(i),val2)
          acrtfct(i) = 1. - acrtfct(i)
c
c  modify acrtfct(i) by colume mean rh if rhbar(i) is greater than 80 percent
c
c         if(rhbar(i).ge..8) then
c           acrtfct(i) = acrtfct(i) * (.9 - min(rhbar(i),.9)) * 10.
c         endif
c
c  modify adjustment time scale by cloud base vertical velocity
c
          dtconv(i) = dt2 + max((1800. - dt2),0.) *
     &                (pdot(i) - w2) / (w1 - w2)
c         dtconv(i) = max(dtconv(i), dt2)
c         dtconv(i) = 1800. * (pdot(i) - w2) / (w1 - w2)
          dtconv(i) = max(dtconv(i),dtmin)
          dtconv(i) = min(dtconv(i),dtmax)
c
        endif
      enddo
c
c--- large scale forcing
c
      do i= 1, im
        if(cnvflg(i)) then
          fld(i)=(aa1(i)-acrt(i)* acrtfct(i))/dtconv(i)
          if(fld(i).le.0.) cnvflg(i) = .false.
        endif
        if(cnvflg(i)) then
c         xaa0(i) = max(xaa0(i),0.)
          xk(i) = (xaa0(i) - aa1(i)) / mbdt
          if(xk(i).ge.0.) cnvflg(i) = .false.
        endif
c
c--- kernel, cloud base mass flux
c
        if(cnvflg(i)) then
          xmb(i) = -fld(i) / xk(i)
          xmb(i) = min(xmb(i),xmbmax(i))
        endif
      enddo
!!
      totflg = .true.
      do i=1,im
        totflg = totflg .and. (.not. cnvflg(i))
      enddo
      if(totflg) return
!!
c
c  restore to,qo,uo,vo to t1,q1,u1,v1 in case convection stops
c
      do k = 1, km
        do i = 1, im
          if (cnvflg(i) .and. k .le. kmax(i)) then
            to(i,k) = t1(i,k)
            qo(i,k) = q1(i,k)
            uo(i,k) = u1(i,k)
            vo(i,k) = v1(i,k)
            qeso(i,k) = 0.01 * fpvs(t1(i,k))      ! fpvs is in pa
            qeso(i,k) = eps * qeso(i,k) / (pfld(i,k) + epsm1*qeso(i,k))
            val     =             1.e-8
            qeso(i,k) = max(qeso(i,k), val )
          endif
        enddo
      enddo
c!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
c
c--- feedback: simply the changes from the cloud with unit mass flux
c---           multiplied by  the mass flux necessary to keep the
c---           equilibrium with the larger-scale.
c
      do i = 1, im
        delhbar(i) = 0.
        delqbar(i) = 0.
        deltbar(i) = 0.
        delubar(i) = 0.
        delvbar(i) = 0.
        qcond(i) = 0.
      enddo
      do k = 1, km
        do i = 1, im
          if (cnvflg(i) .and. k .le. kmax(i)) then
            if(k.le.ktcon(i)) then
              dellat = (dellah(i,k) - hvap * dellaq(i,k)) / cp
              t1(i,k) = t1(i,k) + dellat * xmb(i) * dt2
              q1(i,k) = q1(i,k) + dellaq(i,k) * xmb(i) * dt2
!             tem = 1./rcs(i)
!             u1(i,k) = u1(i,k) + dellau(i,k) * xmb(i) * dt2 * tem
!             v1(i,k) = v1(i,k) + dellav(i,k) * xmb(i) * dt2 * tem
              u1(i,k) = u1(i,k) + dellau(i,k) * xmb(i) * dt2
              v1(i,k) = v1(i,k) + dellav(i,k) * xmb(i) * dt2
              dp = 1000. * del(i,k)
              delhbar(i) = delhbar(i) + dellah(i,k)*xmb(i)*dp/g
              delqbar(i) = delqbar(i) + dellaq(i,k)*xmb(i)*dp/g
              deltbar(i) = deltbar(i) + dellat*xmb(i)*dp/g
              delubar(i) = delubar(i) + dellau(i,k)*xmb(i)*dp/g
              delvbar(i) = delvbar(i) + dellav(i,k)*xmb(i)*dp/g
            endif
          endif
        enddo
      enddo
      do k = 1, km
        do i = 1, im
          if (cnvflg(i) .and. k .le. kmax(i)) then
            if(k.le.ktcon(i)) then
              qeso(i,k) = 0.01 * fpvs(t1(i,k))      ! fpvs is in pa
              qeso(i,k) = eps * qeso(i,k)/(pfld(i,k) + epsm1*qeso(i,k))
              val     =             1.e-8
              qeso(i,k) = max(qeso(i,k), val )
            endif
          endif
        enddo
      enddo
c
      do i = 1, im
        rntot(i) = 0.
        delqev(i) = 0.
        delq2(i) = 0.
        flg(i) = cnvflg(i)
      enddo
      do k = km, 1, -1
        do i = 1, im
          if (cnvflg(i) .and. k .le. kmax(i)) then
            if(k.lt.ktcon(i)) then
              aup = 1.
              if(k.le.kb(i)) aup = 0.
              adw = 1.
              if(k.ge.jmin(i)) adw = 0.
              rain =  aup * pwo(i,k) + adw * edto(i) * pwdo(i,k)
              rntot(i) = rntot(i) + rain * xmb(i) * .001 * dt2
            endif
          endif
        enddo
      enddo
      do k = km, 1, -1
        do i = 1, im
          if (k .le. kmax(i)) then
            deltv(i) = 0.
            delq(i) = 0.
            qevap(i) = 0.
            if(cnvflg(i).and.k.lt.ktcon(i)) then
              aup = 1.
              if(k.le.kb(i)) aup = 0.
              adw = 1.
              if(k.ge.jmin(i)) adw = 0.
              rain =  aup * pwo(i,k) + adw * edto(i) * pwdo(i,k)
              rn(i) = rn(i) + rain * xmb(i) * .001 * dt2
            endif
            if(flg(i).and.k.lt.ktcon(i)) then
              evef = edt(i) * evfact
              if(islimsk(i) == 1) evef=edt(i) * evfactl
!             if(islimsk(i) == 1) evef=.07
c             if(islimsk(i) == 1) evef = 0.
              qcond(i) = evef * (q1(i,k) - qeso(i,k))
     &                 / (1. + el2orc * qeso(i,k) / t1(i,k)**2)
              dp = 1000. * del(i,k)
              if(rn(i).gt.0..and.qcond(i).lt.0.) then
                qevap(i) = -qcond(i) * (1.-exp(-.32*sqrt(dt2*rn(i))))
                qevap(i) = min(qevap(i), rn(i)*1000.*g/dp)
                delq2(i) = delqev(i) + .001 * qevap(i) * dp / g
              endif
              if(rn(i).gt.0..and.qcond(i).lt.0..and.
     &           delq2(i).gt.rntot(i)) then
                qevap(i) = 1000.* g * (rntot(i) - delqev(i)) / dp
                flg(i) = .false.
              endif
              if(rn(i).gt.0..and.qevap(i).gt.0.) then
                q1(i,k) = q1(i,k) + qevap(i)
                t1(i,k) = t1(i,k) - elocp * qevap(i)
                rn(i) = rn(i) - .001 * qevap(i) * dp / g
                deltv(i) = - elocp*qevap(i)/dt2
                delq(i) =  + qevap(i)/dt2
                delqev(i) = delqev(i) + .001*dp*qevap(i)/g
              endif
              dellaq(i,k) = dellaq(i,k) + delq(i) / xmb(i)
              delqbar(i) = delqbar(i) + delq(i)*dp/g
              deltbar(i) = deltbar(i) + deltv(i)*dp/g
            endif
          endif
        enddo
      enddo
cj
!     do i = 1, im
!     if(me.eq.31.and.cnvflg(i)) then
!     if(cnvflg(i)) then
!       print *, ' deep delhbar, delqbar, deltbar = ',
!    &             delhbar(i),hvap*delqbar(i),cp*deltbar(i)
!       print *, ' deep delubar, delvbar = ',delubar(i),delvbar(i)
!       print *, ' precip =', hvap*rn(i)*1000./dt2
!       print*,'pdif= ',pfld(i,kbcon(i))-pfld(i,ktcon(i))
!     endif
!     enddo
c
c  precipitation rate converted to actual precip
c  in unit of m instead of kg
c
      do i = 1, im
        if(cnvflg(i)) then
c
c  in the event of upper level rain evaporation and lower level downdraft
c    moistening, rn can become negative, in this case, we back out of the
c    heating and the moistening
c
          if(rn(i).lt.0..and..not.flg(i)) rn(i) = 0.
          if(rn(i).le.0.) then
            rn(i) = 0.
          else
            ktop(i) = ktcon(i)
            kbot(i) = kbcon(i)
            kcnv(i) = 1
            cldwrk(i) = aa1(i)
          endif
        endif
      enddo
c
c  convective cloud water
c
      do k = 1, km
        do i = 1, im
          if (cnvflg(i) .and. rn(i).gt.0.) then
            if (k.ge.kbcon(i).and.k.lt.ktcon(i)) then
              cnvw(i,k) = cnvwt(i,k) * xmb(i) * dt2
            endif
          endif
        enddo
      enddo
c
c  convective cloud cover
c
      do k = 1, km
        do i = 1, im
          if (cnvflg(i) .and. rn(i).gt.0.) then
            if (k.ge.kbcon(i).and.k.lt.ktcon(i)) then
              cnvc(i,k) = 0.04 * log(1. + 675. * eta(i,k) * xmb(i)) 
              cnvc(i,k) = min(cnvc(i,k), 0.6)
              cnvc(i,k) = max(cnvc(i,k), 0.0)
            endif
          endif
        enddo
      enddo

c
c  cloud water
c
      if (ncloud.gt.0) then
!
      do k = 1, km
        do i = 1, im
          if (cnvflg(i) .and. rn(i).gt.0.) then
            if (k.gt.kb(i).and.k.le.ktcon(i)) then
              tem  = dellal(i,k) * xmb(i) * dt2
              tem1 = max(0.0, min(1.0, (tcr-t1(i,k))*tcrf))
              if (ql(i,k,2) .gt. -999.0) then
                ql(i,k,1) = ql(i,k,1) + tem * tem1            ! ice
                ql(i,k,2) = ql(i,k,2) + tem *(1.0-tem1)       ! water
              else
                ql(i,k,1) = ql(i,k,1) + tem
              endif
            endif
          endif
        enddo
      enddo
!
      endif
c
      do k = 1, km
        do i = 1, im
          if(cnvflg(i).and.rn(i).le.0.) then
            if (k .le. kmax(i)) then
              t1(i,k) = to(i,k)
              q1(i,k) = qo(i,k)
              u1(i,k) = uo(i,k)
              v1(i,k) = vo(i,k)
            endif
          endif
        enddo
      enddo
!
! hchuang code change
!
      do k = 1, km
        do i = 1, im
          if(cnvflg(i).and.rn(i).gt.0.) then
            if(k.ge.kb(i) .and. k.lt.ktop(i)) then
              ud_mf(i,k) = eta(i,k) * xmb(i) * dt2
            endif
          endif
        enddo
      enddo
      do i = 1, im
        if(cnvflg(i).and.rn(i).gt.0.) then
           k = ktop(i)-1
           dt_mf(i,k) = ud_mf(i,k)
        endif
      enddo
      do k = 1, km
        do i = 1, im
          if(cnvflg(i).and.rn(i).gt.0.) then
            if(k.ge.1 .and. k.le.jmin(i)) then
              dd_mf(i,k) = edto(i) * etad(i,k) * xmb(i) * dt2
            endif
          endif
        enddo
      enddo
!!
      return
      end
