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module cv30_param_m |
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! $Header: /home/cvsroot/LMDZ4/libf/phylmd/cv3_routines.F,v 1.5 2005/07/11 15:20:02 lmdzadmin Exp $ |
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! |
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SUBROUTINE cv3_param(nd,delt) |
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use conema3_m |
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use cvparam3 |
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implicit none |
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!------------------------------------------------------------ |
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! Set parameters for convectL for iflag_con = 3 |
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!------------------------------------------------------------ |
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! |
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! *** PBCRIT IS THE CRITICAL CLOUD DEPTH (MB) BENEATH WHICH THE *** |
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! *** PRECIPITATION EFFICIENCY IS ASSUMED TO BE ZERO *** |
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! *** PTCRIT IS THE CLOUD DEPTH (MB) ABOVE WHICH THE PRECIP. *** |
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! *** EFFICIENCY IS ASSUMED TO BE UNITY *** |
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! *** SIGD IS THE FRACTIONAL AREA COVERED BY UNSATURATED DNDRAFT *** |
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! *** SPFAC IS THE FRACTION OF PRECIPITATION FALLING OUTSIDE *** |
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! *** OF CLOUD *** |
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! |
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! [TAU: CHARACTERISTIC TIMESCALE USED TO COMPUTE ALPHA & BETA] |
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! *** ALPHA AND BETA ARE PARAMETERS THAT CONTROL THE RATE OF *** |
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! *** APPROACH TO QUASI-EQUILIBRIUM *** |
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! *** (THEIR STANDARD VALUES ARE 1.0 AND 0.96, RESPECTIVELY) *** |
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! *** (BETA MUST BE LESS THAN OR EQUAL TO 1) *** |
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! |
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! *** DTCRIT IS THE CRITICAL BUOYANCY (K) USED TO ADJUST THE *** |
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! *** APPROACH TO QUASI-EQUILIBRIUM *** |
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! *** IT MUST BE LESS THAN 0 *** |
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integer nd |
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real, intent(in):: delt ! timestep (seconds) |
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! noff: integer limit for convection (nd-noff) |
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! minorig: First level of convection |
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! -- limit levels for convection: |
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noff = 1 |
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minorig = 1 |
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nl=nd-noff |
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nlp=nl+1 |
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nlm=nl-1 |
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! -- "microphysical" parameters: |
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sigd = 0.01 |
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spfac = 0.15 |
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pbcrit = 150.0 |
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ptcrit = 500.0 |
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!IM cf. FH epmax = 0.993 |
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omtrain = 45.0 ! used also for snow (no disctinction rain/snow) |
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! -- misc: |
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dtovsh = -0.2 ! dT for overshoot |
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dpbase = -40. ! definition cloud base (400m above LCL) |
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dttrig = 5. ! (loose) condition for triggering |
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! -- rate of approach to quasi-equilibrium: |
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dtcrit = -2.0 |
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tau = 8000. |
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beta = 1.0 - delt/tau |
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alpha = 1.5E-3 * delt/tau |
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! increase alpha to compensate W decrease: |
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alpha = alpha*1.5 |
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! -- interface cloud parameterization: |
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delta=0.01 ! cld |
! From LMDZ4/libf/phylmd/cvparam3.h, version 1.1.1.1, 2004/05/19 12:53:09 |
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! -- interface with boundary-layer (gust factor): (sb) |
! Set parameters for Emanuel convection scheme. Includes |
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! microphysical parameters and parameters that control the rate of |
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! approach to quasi-equilibrium. |
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betad=10.0 ! original value (from convect 4.3) |
USE dimphy, ONLY: klev |
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return |
implicit none |
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end |
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integer, parameter:: minorig = 1 |
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! first level of convection (limit levels for convection) |
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integer, parameter:: nl = klev - 1 |
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! Limit for convection. The maximum number of levels to which |
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! convection can penetrate, plus 1. We should have: |
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! 6 <= nl <= KLEV - 1 |
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! (because of locate in cv30_feed). |
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real, parameter:: sigd = 0.01 |
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! fractional area covered by unsaturated downdraft |
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! \sigma_d in Emanuel (1991 928) |
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real, parameter:: dtcrit = - 2. |
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! Critical buoyancy (K) used to adjust the approach to |
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! quasi-equilibrium. It must be < 0. |
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real beta, alpha |
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! Parameters that control the rate of approach to quasi-equilibrium |
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! (their standard values are 1. and 0.96, respectively) (beta must |
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! be less than or equal to 1). |
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private klev |
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contains |
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SUBROUTINE cv30_param |
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! From LMDZ4/libf/phylmd/cv3_routines.F, version 1.5, 2005/07/11 15:20:02 |
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use comconst, only: dtphys |
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! Local: |
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real, parameter:: tau = 8000. |
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! characteristic timescale used to compute alpha and beta |
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!------------------------------------------------------------ |
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beta = 1. - dtphys / tau |
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alpha = 1.5E-3 * dtphys / tau * 1.5 |
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! factor 1.5: increase alpha to compensate W decrease |
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end SUBROUTINE cv30_param |
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end module cv30_param_m |
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