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SUBROUTINE cv_undilute1(len,nd,t,q,qs,gz,p,nk,icb,icbmax & |
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,tp,tvp,clw) |
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use cvthermo |
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use cvparam |
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implicit none |
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|
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! inputs: |
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integer len, nd |
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integer nk(len), icb(len), icbmax |
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real, intent(in):: t(len,nd) |
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real q(len,nd), qs(len,nd), gz(len,nd) |
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real p(len,nd) |
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|
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! outputs: |
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real tp(len,nd), tvp(len,nd), clw(len,nd) |
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|
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! local variables: |
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integer i, k |
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real tg, qg, alv, s, ahg, tc, denom, es, rg |
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real ah0(len), cpp(len) |
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real tnk(len), qnk(len), gznk(len), ticb(len), gzicb(len) |
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|
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!------------------------------------------------------------------- |
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! --- Calculates the lifted parcel virtual temperature at nk, |
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! --- the actual temperature, and the adiabatic |
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! --- liquid water content. The procedure is to solve the equation. |
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! cp*tp+L*qp+phi=cp*tnk+L*qnk+gznk. |
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!------------------------------------------------------------------- |
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|
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do 320 i=1,len |
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tnk(i)=t(i,nk(i)) |
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qnk(i)=q(i,nk(i)) |
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gznk(i)=gz(i,nk(i)) |
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ticb(i)=t(i,icb(i)) |
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gzicb(i)=gz(i,icb(i)) |
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320 continue |
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! |
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! *** Calculate certain parcel quantities, including static energy *** |
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! |
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do 330 i=1,len |
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ah0(i)=(cpd*(1.-qnk(i))+cl*qnk(i))*tnk(i) & |
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+qnk(i)*(lv0-clmcpv*(tnk(i)-273.15))+gznk(i) |
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cpp(i)=cpd*(1.-qnk(i))+qnk(i)*cpv |
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330 continue |
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! |
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! *** Calculate lifted parcel quantities below cloud base *** |
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! |
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do 350 k=minorig,icbmax-1 |
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do 340 i=1,len |
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tp(i,k)=tnk(i)-(gz(i,k)-gznk(i))/cpp(i) |
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tvp(i,k)=tp(i,k)*(1.+qnk(i)*epsi) |
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340 continue |
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350 continue |
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! |
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! *** Find lifted parcel quantities above cloud base *** |
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! |
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do 360 i=1,len |
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tg=ticb(i) |
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qg=qs(i,icb(i)) |
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alv=lv0-clmcpv*(ticb(i)-t0) |
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! |
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! First iteration. |
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! |
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s=cpd+alv*alv*qg/(rrv*ticb(i)*ticb(i)) |
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s=1./s |
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ahg=cpd*tg+(cl-cpd)*qnk(i)*ticb(i)+alv*qg+gzicb(i) |
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tg=tg+s*(ah0(i)-ahg) |
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tg=max(tg,35.0) |
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tc=tg-t0 |
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denom=243.5+tc |
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if(tc.ge.0.0)then |
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es=6.112*exp(17.67*tc/denom) |
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else |
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es=exp(23.33086-6111.72784/tg+0.15215*log(tg)) |
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endif |
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qg=eps*es/(p(i,icb(i))-es*(1.-eps)) |
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! |
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! Second iteration. |
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! |
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s=cpd+alv*alv*qg/(rrv*ticb(i)*ticb(i)) |
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s=1./s |
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ahg=cpd*tg+(cl-cpd)*qnk(i)*ticb(i)+alv*qg+gzicb(i) |
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tg=tg+s*(ah0(i)-ahg) |
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tg=max(tg,35.0) |
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tc=tg-t0 |
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denom=243.5+tc |
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if(tc.ge.0.0)then |
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es=6.112*exp(17.67*tc/denom) |
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else |
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es=exp(23.33086-6111.72784/tg+0.15215*log(tg)) |
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end if |
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qg=eps*es/(p(i,icb(i))-es*(1.-eps)) |
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! |
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alv=lv0-clmcpv*(ticb(i)-273.15) |
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tp(i,icb(i))=(ah0(i)-(cl-cpd)*qnk(i)*ticb(i) & |
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-gz(i,icb(i))-alv*qg)/cpd |
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clw(i,icb(i))=qnk(i)-qg |
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clw(i,icb(i))=max(0.0,clw(i,icb(i))) |
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rg=qg/(1.-qnk(i)) |
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tvp(i,icb(i))=tp(i,icb(i))*(1.+rg*epsi) |
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360 continue |
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! |
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do 380 k=minorig,icbmax |
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do 370 i=1,len |
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tvp(i,k)=tvp(i,k)-tp(i,k)*qnk(i) |
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370 continue |
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380 continue |
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! |
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return |
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end |
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