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- From: blanchard@nsslc.gcn.uoknor.edu (David O. Blanchard)
- Subject: Re: STOP Re: mesoscale forecast model
- Message-ID: <17NOV199216465953@nsslc.gcn.uoknor.edu>
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- Sender: news@nsslsun.nssl.uoknor.edu
- Organization: National Severe Storms Laboratory
- References: <1992Nov16.165209.9290@news.arc.nasa.gov> <1992Nov17.010750.26822@meteor.wisc.edu>
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- Date: Tue, 17 Nov 1992 16:46:00 GMT
- Lines: 45
-
- In article <1992Nov17.010750.26822@meteor.wisc.edu>, stvjas@meteor.wisc.edu (Stephen Jascourt) writes...
-
- [previous comments about who said what about models deleted]
-
- >There is no "best" model. Each has certain things it does well and certain
- >things that give the model problems. There is a "best" model for a particular
- >application, but more likely the difference from one to another may be no
- >worse than their errors. And, worst of all, model intercomparisons are next to
- >impossible for a multitude of reasons. A particular model can perform very
- >differently by just changing a few parameters, and the parameter values that
- >work best for particular situations for one model may be different than the
- >values best for another model. For generic, artificial tests like dropping a
- >cold bubble in a box, reasonable comparisons can be made but the test itself
- >is rather artificial. For real data cases or realistic idealized experiments,
- >the initial numerically balanced fields will be different from one model to
- >another, so you're not really even starting off the same! And, of course,
- >most of these sophisticated models have many options for various
- >parameterizations such as soil models, radiation, and sub-grid scale turbulence,
- >by choosing different options for these you really have many different models
- >in one program.
- >
-
- Steve has stated the situation well regarding comparisons of models and
- what is "best". Best is decided by the end-user and the users needs.
-
- >As for whether these things should be "decided" on usenet, I think discussion
- >of the strengths and weaknesses of different models, what machines they can
- >run on and how much computational resources they require, etc. are good topics
- >for discussion-- they are part of an exchange of scientific information that,
- >after all, is supposed to be the function of usenet.
- >
- >Stephen Jascourt stvjas@meteor.wisc.edu
-
- I wholeheartedly agree with Steve that s.g.m IS the place to discuss this
- topic. Journal articles are written so that they are not inflammatory
- (well, usually) and often sterile. Discussions about models posted here
- will not only contain "just the facts", but anecdotes, words of advice,
- pitfalls, sources of frustration, etc., etc., etc. All this, in my opinion,
- is useful to the prospective model user.
-
- --db
- +--------------------------------------------------------------------------+
- |David O. Blanchard dob@nssl.erl.gov |
- |Boulder, Colorado blanchard@nsslc.gcn.uoknor.edu |
- +--------------------------------------------------------------------------+
-