Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum

Re: Higher resolution model

Posted By: Stephen Jascourt
Date: 27-October-05 1756Z

In Response To: Re: Higher resolution model (John Brown)

John, You say WRFRUC is initializing off of a RUC that uses isentropic coordinates. Any model change including the vertical coordinate change should be amplified by cycling on itself - you should see a stronger signal in the model differences after you start cycling the WRF Rapid Refresh runs on itself. 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. Stephen

Messages In This Thread

Higher resolution model -- Justin Donahue -- 4-September-05 1745Z

ADMIN! Re: Higher resolution model -- Stan Benjamin -- 5-September-05 1055Z

Re: Higher resolution model -- Jack Glendening -- 12-October-05 1837Z

Re: Higher resolution model -- John Brown -- 13-October-05 1904Z

Re: Higher resolution model -- Will Murray -- 14-October-05 1008Z

Re: Higher resolution model -- John Brown -- 19-October-05 1908Z

Re: Higher resolution model -- Stephen Jascourt -- 27-October-05 1756Z

Re: Higher resolution model -- Jack Glendening -- 2-November-05 2211Z

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