You should use geopotential. For WRF output that will be PH+PHB, which is base plus perturbation.
wrfhelp
------------------------------------------------------------------------------
http://www.mmm.ucar.edu/wrf/users/supports/wrfhelp.html
On Jul 9, 2012, at 9:47 AM, Mary Haley wrote:
> Hi Bill,
>
> I'm not sure you used the correct address for wrfhelp, so I've included them here. Hopefully they can clear up the confusion about PH versus PH+PHB, and I'll be happy to update the documentation then.
>
> --Mary
>
> On Jul 6, 2012, at 12:17 PM, Capehart, William J wrote:
>
>> Hi All
>>
>> I am working with our weather service office trying to better coordinate
>> and synchronize our real-time modeling efforts.
>>
>> We're running into a slight impasse on updraft helicity with UPP and NCL
>> producing notably different outputs.
>>
>> In reviewing the documentation for wrf_updraft_helicity, I am seeing that
>> it is asking in the argument list for perturbation geopotential (in the
>> WRF output list, PH) but in the example the respective argument is using
>> the perturbation + base state geopotential.
>>
>> Should I be using only PH or (PH + PHB)?
>>
>> In either case can the NCL documentation be updated to be less confusing?
>>
>> Thanks Much
>> ================================================================
>> Bill Capehart <William.Capehart@sdsmt.edu> Associate Professor
>> Department of Atmospheric Sciences
>> 213 Mineral Industries Building Skype/EVO: wcapehart
>> South Dakota School of Mines and Technology Ph: +1-605-394-1994
>> 501 East Saint Joseph Street Fax: +1-605-394-6061
>> Rapid City, SD 57701-3995 Mobile: +1-605-484-5692
>> =================== http://capehart.sdsmt.edu ==================
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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Received on Mon Jul 16 11:25:13 2012
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