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UNSTATIONARY ASPECTS OF FÖHN IN A LARGE VALLEY

Reinhold Steinacker orcid.org/0000-0002-6868-9268 ; University of Vienna, Department of Meteorology and Geophysics, Althanstr. 14, UZAII, A-1090, Vienna
FORM group ; MAP-FORM group: see http://www.map.ethz.ch/form

Sažetak

After an outline of the scientific questions within FORM (Foehn study in the Rhine valley during MAP) some results are being discussed, which allow a deeper insight into the unstationary behavior of foehn in a complex Alpine valley. Due to an extremely dense and sophisticated instrumentation of in situ and remote sensing platforms the themodynamic and dynamic structure could be nicely investigated. It was clearly seen that the static stability within valleys may be quite complex, leading often to a three rather than two layer configuration. Simulations with different very high resolution models allow to derive the critical factors which determine the usefulness of the model with respect to local foehn prediction. Of special importance is the correct treatment of the shallow cold air pool. Considering the scientific results so far obtained of the different types of foehn events during MAP-SOP (MAP Special Observing Period, 7 September – 15 November 1999) the FORM initiative can be seen as a very successful part of MAP.

Ključne riječi

MAP; Foehn; Alps; complex topography; Cold air pool; flow splitting; very high resolution modeling

Hrčak ID:

64417

URI

https://hrcak.srce.hr/64417

Datum izdavanja:

15.12.2005.

Posjeta: 604 *