[Wrf-users] Re: Wrf-users Digest, Vol 53, Issue 16

[wrfhelp]

Will this paper offer any information?
Grell, G. A., and D. Devenyi, 2002: A generalized approach to  
parameterizing convection com-
bining ensemble and data assimilation techniques. Geophys. Res. Lett.,  
29(14), Article 1693.

wrfhelp

On Jan 23, 2009, at 12:00 PM, wrf-users-request at ucar.edu wrote:

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> Today's Topics:
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>   1. Triggering of Grell Devenyi cumulus in WRF (Gareth Berry)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 22 Jan 2009 19:28:59 +0000 (GMT)
> From: Gareth Berry <gareth at atmos.albany.edu>
> Subject: [Wrf-users] Triggering of Grell Devenyi cumulus in WRF
> To: wrf-users at ucar.edu
> Message-ID: <200901221928.n0MJSxc03263 at guava.atmos.albany.edu>
> Content-Type: TEXT/plain; charset=us-ascii
>
> Hi Folks,
>
> I've got a very basic but very important question for any folks who  
> are familiar
> with the WRF cumulus parameteriztions.
>
> Basically what I want to know is how is the Grell Devenyi cu scheme  
> 'activated'
> in WRF?
>
> I'm not after the feedback to the model, as this is well documented,  
> what I
> would like to know is what conditions have to be fulfilled for the  
> GD scheme to
> produce convection. I know for the case of other types of cu scheme  
> there are
> requirements for there to be a layer x hPa think of greater than y  
> precent
> relative humidity and with greater than z m/s vertical motion, but I  
> can't find
> any documentation of any thing similar in the documentation.
>
> I've googled until the cows come home and found a few reference that  
> hint there
> is a Arakawa-Schubert type trigger that requires a 'cloud work  
> function' (a
> function of integrated buoyancy) to exceed a critial value. If this  
> is the case
> I would like to find out what the critial value is or how I can find  
> it.
>
> I've try using the WRF code browser, but it is pretty difficult to  
> follow if
> you're not familiar with the model architecture, plus the links to  
> the search
> function and documentation are down. Based on this I think that the  
> triggering
> itself might also be done using the GD ensemble approach, but I  
> would like to
> make certain.
>
> Any help would be welcome!
>
> Cheers,
>
> Gareth.
>
>
>
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> End of Wrf-users Digest, Vol 53, Issue 16
> *****************************************