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module cv30_trigger_m |
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|
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implicit none |
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|
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contains |
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|
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SUBROUTINE cv30_trigger(icb1, plcl1, p1, th1, tv1, tvp1, pbase1, buoybase1, & |
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iflag1, sig1, w01) |
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|
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! Triggering: |
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! - computes the cloud base |
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! - triggering (crude in this version) |
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! - relaxation of sig1 and w01 when no convection |
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|
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! Caution 1: if no convection, we set iflag1 = 4 |
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|
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! Caution 2: at this stage, tvp1 (and thus buoy) are known up |
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! through icb1 only! -> the buoyancy below cloud base not (yet) |
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! set to the cloud base buoyancy |
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|
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use cv30_param_m, only: alpha, beta, dtcrit, nl |
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USE dimphy, ONLY: klev, klon |
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|
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integer, intent(in):: icb1(klon) |
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! first level above LCL, 2 <= icb1 <= nl - 2 |
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|
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real, intent(in):: plcl1(klon), p1(klon, klev) |
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real, intent(in):: th1(:, :) ! (klon, nl) |
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real, intent(in):: tv1(klon, klev), tvp1(klon, klev) |
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|
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real, intent(out):: pbase1(klon), buoybase1(klon) |
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|
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integer, intent(inout):: iflag1(klon) |
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real, intent(inout):: sig1(klon, klev), w01(klon, klev) |
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|
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! Local: |
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real, parameter:: dttrig = 5. ! (loose) condition for triggering |
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real, parameter:: dpbase = - 40. ! definition cloud base (400 m above LCL) |
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integer i, k |
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real tvpbase, tvbase |
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|
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!--------------------------------------------------------------------- |
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|
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! Set cloud base buoyancy at plcl1 + dpbase level buoyancy: |
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do i = 1, klon |
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pbase1(i) = plcl1(i) + dpbase |
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tvpbase = tvp1(i, icb1(i)) * (pbase1(i) - p1(i, icb1(i) + 1)) & |
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/(p1(i, icb1(i)) - p1(i, icb1(i) + 1)) & |
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+ tvp1(i, icb1(i) + 1) * (p1(i, icb1(i)) - pbase1(i)) & |
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/(p1(i, icb1(i)) - p1(i, icb1(i) + 1)) |
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tvbase = tv1(i, icb1(i)) * (pbase1(i) - p1(i, icb1(i) + 1)) & |
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/(p1(i, icb1(i)) - p1(i, icb1(i) + 1)) & |
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+ tv1(i, icb1(i) + 1) * (p1(i, icb1(i)) - pbase1(i)) & |
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/(p1(i, icb1(i)) - p1(i, icb1(i) + 1)) |
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buoybase1(i) = tvpbase - tvbase |
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end do |
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|
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! Make sure that column is dry adiabatic between the surface and |
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! cloud base, and that lifted air is positively buoyant at cloud |
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! base. If not, return to calling program after resetting sig1(i) |
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! and w01(i). |
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do k = 1, nl |
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do i = 1, klon |
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if (buoybase1(i) < dtcrit .or. th1(i, icb1(i) - 1) - dttrig & |
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> th1(i, 1)) then |
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sig1(i, k) = MAX(beta * sig1(i, k) - 2. * alpha & |
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* buoybase1(i)**2, 0.) |
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w01(i, k) = beta * w01(i, k) |
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iflag1(i) = 4 |
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endif |
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end do |
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end do |
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|
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end SUBROUTINE cv30_trigger |
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|
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end module cv30_trigger_m |
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