Berlin 2005 – wissenschaftliches Programm

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EP: Extraterrestrische Physik


EP 2.7: Vortrag

Freitag, 4. März 2005, 16:30–16:45, TU BH349

SABER and GPS, the prospective of continuous global gravity wave data from solar max to solar min — •Peter Preusse1, Jens Wickert2, Manfred Ern1, and Christoph Jacobi31ICG-I, Forschungszentrum Juelich, 52425 Juelich, Germany — 2GeoForschungsZentrum Potsdam (GFZ), 14473 Potsdam, Germany — 3LIM, University of Leipzig, 04103 Leipzig, Germany

SABER satellite data are analyzed for gravity waves (GWs) up to 90 km altitude. GW distributions for Aug 2003 agree in their salient features with previous measurements from CLAES (Aug 1993) and CRISTA-2 (Aug 1997). All three data sets show convectively generated GWs in the NH subtropics and a strong maximum in the southern polar vortex (PV), which tilts equatorward around 70km altitude where the PV merges with a subtropical mesospheric jet. SABER data contain GWs with vertical wavelengths >2km. Even shorter wavelengths are addressable by novel retrieval techniques for GPS radio occultations (RO). GPS RO will particularly bring new insight on the saturated part of the GW spectrum and at altitudes where infrared remote sensing is blocked by clouds. In addition, first comparisons between GPS ionospheric irregularities and SABER GW variances are shown. GPS and SABER provide continuous coverage since the last solar max and are expected to operate until the next solar min or longer. Together with supplementary GW modeling covering several solar cycles, unprecedented insight on long term variations of GWs on global scale and their interaction with e.g. planetary waves will be gained.

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