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SUBROUTINE cv3_trigger(len,nd,icb,plcl,p,th,tv,tvp & |
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,pbase,buoybase,iflag,sig,w0) |
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use cv3_param_m |
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implicit none |
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|
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!------------------------------------------------------------------- |
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! --- TRIGGERING |
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! |
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! - computes the cloud base |
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! - triggering (crude in this version) |
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! - relaxation of sig and w0 when no convection |
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! |
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! Caution1: if no convection, we set iflag=4 |
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! (it used to be 0 in convect3) |
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! |
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! Caution2: at this stage, tvp (and thus buoy) are know up |
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! through icb only! |
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! -> the buoyancy below cloud base not (yet) set to the cloud base buoyancy |
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!------------------------------------------------------------------- |
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|
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! input: |
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integer len, nd |
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integer icb(len) |
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real plcl(len), p(len,nd) |
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real th(len,nd), tv(len,nd), tvp(len,nd) |
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|
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! output: |
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real pbase(len), buoybase(len) |
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|
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! input AND output: |
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integer iflag(len) |
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real, intent(inout):: sig(len,nd), w0(len,nd) |
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|
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! local variables: |
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integer i,k |
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real tvpbase, tvbase, tdif, ath, ath1 |
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! |
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! *** set cloud base buoyancy at (plcl+dpbase) level buoyancy |
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! |
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do 100 i=1,len |
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pbase(i) = plcl(i) + dpbase |
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tvpbase = tvp(i,icb(i))*(pbase(i)-p(i,icb(i)+1)) & |
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/(p(i,icb(i))-p(i,icb(i)+1)) & |
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+ tvp(i,icb(i)+1)*(p(i,icb(i))-pbase(i)) & |
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/(p(i,icb(i))-p(i,icb(i)+1)) |
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tvbase = tv(i,icb(i))*(pbase(i)-p(i,icb(i)+1)) & |
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/(p(i,icb(i))-p(i,icb(i)+1)) & |
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+ tv(i,icb(i)+1)*(p(i,icb(i))-pbase(i)) & |
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/(p(i,icb(i))-p(i,icb(i)+1)) |
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buoybase(i) = tvpbase - tvbase |
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100 continue |
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|
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! |
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! *** make sure that column is dry adiabatic between the surface *** |
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! *** and cloud base, and that lifted air is positively buoyant *** |
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! *** at cloud base *** |
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! *** if not, return to calling program after resetting *** |
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! *** sig(i) and w0(i) *** |
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! |
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|
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do 60 k=1,nl |
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do 200 i=1,len |
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|
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tdif = buoybase(i) |
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ath1 = th(i,1) |
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ath = th(i,icb(i)-1) - dttrig |
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if (tdif.lt.dtcrit .or. ath.gt.ath1) then |
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sig(i,k) = beta*sig(i,k) - 2.*alpha*tdif*tdif |
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sig(i,k) = AMAX1(sig(i,k),0.0) |
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w0(i,k) = beta*w0(i,k) |
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iflag(i)=4 ! pour version vectorisee |
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! convect3 iflag(i)=0 |
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endif |
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200 continue |
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60 continue |
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|
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! fin oct3 -- |
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|
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return |
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end |
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