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EP: Fachverband Extraterrestrische Physik
EP 3: Erdnaher Weltraum / Planeten
EP 3.1: Hauptvortrag
Dienstag, 18. März 2014, 10:30–11:00, DO24 1.103
Sources of ECMWF-resolved gravity waves revealed by ray-tracing — •Peter Preusse1, Manfred Ern1, Silvio Kalisch1, Stephen Eckermann2, Hye-Yeong Chun3, and Martin Riese1 — 1IEK-7, Forschungszentrum Jülich — 2Naval Reasearch Laboratory, Washington DC, USA — 3Yonsei University, Seoul, Korea
Can we employ global ECMWF high-resolution data to infer quantities of resolved GWs? Does this give us insight for the characteristics and relative importance of real GW sources? And can we use such data safely for, e.g., campaign planing?
We here determine amplitudes and 3D wave vectors of GWs at different levels (25km, 35km and 45km altitude) in the stratosphere from their 3D wave structure. Based on the 3D wavevectors backward ray-tracing is employed to characterize specific sources. For instance, in northern winter strong GWMF stems from mountain waves from Norway and Greenland as well as from waves emitted in the lower troposphere by a storm approaching Norway. Together these three events form a burst in the total hemispheric GWMF of a factor of 3.
In the tropical region, GWs have significantly larger horizontal wavelengths but shorter vertical wavelengths than in observations. Likely, the reason is that the convective parametrization of ECMWF treats convection inside a single model cell and couples only the net effects to the global dynamical fields.