Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum
Re: Higher resolution model
Posted By: Stephen Jascourt In Response To: Re: Higher resolution model (John Brown)
Date: 27-October-05 1756Z
In Response To: Re: Higher resolution model (John Brown)
Don Johnson's group at Wisconsin has for many years shown clearly that potential vorticity leaks in isobaric or sigma coordinate models but holds with good integrity in isentropic coordinate models, and he even had a paper a few years ago about how that can lead to systematic model bias. As we get toward finer resolution in both the model and observations, I suspect the relative advantage diminishes in the short term over the data-dense area, so the benefits of isentropic coordinates would be realized more for climate models than for something like the RUC. Nonhydrostatic isentropic coordinate models could be formulated - for instance, Dutton derived the nonhydrostatic "defect" terms. I imagine the prohibitive factor is probably staff time and funding.
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