[gradsusr] How to calculate the velocity potential for a local domain ?

[Becker, Bernd]

Arlindo,
this may be messy and I have not tried it.
But:

If you take some of the global climate data sets,

interpolate your local model grid up to the (coarser) scale (resolution) of the climate data set

cut out the area of interest from the climate data

replace with your regional model output (coarse)

then run fish.

Comments? Anyone?

Cheers,
Bernd.


--
Bernd Becker   Climate Impacts Product Development
Met Office Hadley Centre    FitzRoy Road  Exeter   Devon EX1 3PB  United Kingdom
Tel.: +44 (0) 1392 884511 Fax: +44 (0)870 900 5050
E-mail:bernd.becker at metoffice.gov.uk - http://www.metoffice.gov.uk/research/people/bernd-becker



________________________________
From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Arlindo Meque
Sent: 28 February 2013 16:03
To: Teddy Allen
Cc: gradsusers
Subject: Re: [gradsusr] How to calculate the velocity potential for a local domain ?


Thank you very much for the links.
 Indeed, it does not answer my question: I've my own data (wind fields ) generated by a Regional Climate Model.

Help is needed.

Arlindo
________________________________
De: Teddy Allen <teddyallen at yahoo.com>
Para: Arlindo Meque <mequitomz at yahoo.com.br>; gradsusers <gradsusr at gradsusr.org>; GrADS Users Forum <gradsusr at gradsusr.org>
Enviadas: Quinta-feira, 28 de Fevereiro de 2013 17:41
Assunto: Re: [gradsusr] How to calculate the velocity potential for a local domain ?

One option is to simply download vp data in a grads netcdf format from here:
http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCEP-NCAR/.CDAS-1/.DAILY/.Intrinsic/.PressureLevel/.vpot/

or in monthly format:
http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCEP-NCAR/.CDAS-1/.MONTHLY/.Intrinsic/.PressureLevel/

You can subset and select various times and regions for your needs through this site as well. This does not necessarily answer your question of how to accomplish this calculation in GrADS, but at least you will now have access to it and can use it in GrADS.

good luck,
teddy

http://www.teddyallen.com/
"To move quickly, go alone. To move far, go together."
African Proverb

From: Arlindo Meque <mequitomz at yahoo.com.br>
To: gradsusers <gradsusr at gradsusr.org>
Sent: Thursday, February 28, 2013 4:13 AM
Subject: [gradsusr] How to calculate the velocity potential for a local domain ?


Dear all,

I have wind fields covering only the African domain and I want to calculate the velocity potential.

To my knowledge, the classical "fish" algorithm under the opengrads version works for a global domain.

Any suggestion?


Arlindo

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