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Common Community Physics Package Developed at DTC
 
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Simplified Arakawa-Schubert Deep Convection

The Simplified Arakawa-Schubert scheme parameterizes the effect of deep convection on the environment (represented by the model state variables) in the following way. First, a simple cloud model is used to determine the change in model state variables due to one entraining/detraining cloud type, per unit cloud-base mass flux. Next, the total change in state variables is retrieved by determining the actual cloud base mass flux using the quasi-equilibrium assumption, whereby convection is assumed to be steady-state. This implies that the generation of the cloud work function (interpreted as entrainment-moderated convective available potential energy (CAPE)) by the large scale dynamics is in balance with the consumption of the cloud work function by the convection. More...

Files

file  sascnvn.F
 Contains the entire SAS deep convection scheme.
 

Modules

module  sascnvn
 

Functions/Subroutines

subroutine, public sascnvn::sascnvn_init (imfdeepcnv, imfdeepcnv_sas, errmsg, errflg)
 
subroutine, public sascnvn::sascnvn_run (
 This subroutine contains the entirety of the SAS deep convection scheme.
 

Detailed Description

The SAS scheme uses the working concepts put forth in Arakawa and Schubert (1974) [6] but includes modifications and simplifications from Grell (1993) [75] such as saturated downdrafts and only one cloud type (the deepest possible), rather than a spectrum based on cloud top heights or assumed entrainment rates. The scheme was implemented for the GFS in 1995 by Pan and Wu [166], with further modifications discussed in Han and Pan (2011) [80] , including the calculation of cloud top, a greater CFL-criterion-based maximum cloud base mass flux, updated cloud model entrainment and detrainment, improved convective transport of horizontal momentum, a more general triggering function, and the inclusion of convective overshooting.

Calling Hierarchy Diagram

Diagram depicting how the SAS deep convection scheme is called from the GSM physics time loop

Intraphysics Communication

This space is reserved for a description of how this scheme uses information from other scheme types and/or how information calculated in this scheme is used in other scheme types.