[Wrf-users] Domain Wizard and hyperbolic tangent stretching

[Craig Mattocks]

Hi Milivoj,

Several people have asked me this question, so I am posting this information to the WRF users list.

I obtained permission from the OU-CAPS group to port the vertical coordinate stretching algorithm from the ARPS model (still an excellent, accessible, very well written NWP model) for use with WRF as part of the NSF LEAD cyberinfrastructure project.

I converted the Fortran algorithms to Java, then worked with Jeff "Gandalf" Smith at NOAA/ESRL, who incorporated it into the WRF Domain Wizard.

Documentation on the stretching algorithms is available from the ARPS model web site:

http://www.caps.ou.edu/ARPS/arpsdown.html

Please let me know if you have any other questions.

Best,
Craig

On Feb 7, 2012, at 11:22 AM, Milivoj Kuzmic wrote:

> Dear Dr. Mattocks,
> My apologies for interrupting your undoubtedly busy schedule. Hope you
> spare a moment to help me out with this one. Namely, I am using Domain
> Wizard to setup WRF runs and would appreciate any information on how
> exactly are the WRF eta levels calculated in Vertical Editor when
> hyperbolic tangent stretching is applied (the formula, parameters
> description, exact meaning of entries in Non Linear Level Generator).
> Thanks very much in advance for your time.
> Best regards,
> Mike Kuzmic
> 
> -- 
> ------------------------------------------------------------------------
> Dr Milivoj "Mike" Kuzmic, Head          Internet: kuzmic at rudjer.irb.hr
> Satellite Oceanography Laboratory
> Marine & Environmental Research Division
> Rudjer Boskovic Institute                      web: www.irb.hr
> P.O.Box 180                                    fax: +385-1-456 0969
> 10002 Zagreb, Croatia                        phone: +385-1-456 1139
> ------------------------------------------------------------------------
>