HR: 11:35h
AN: G42A-06    [Abstracts]
TI: High-Resolution Atmosphere Angular Momentum Time Series From the ECMWF
AU: * Boehm, J
EM: johannes.boehm@tuwien.ac.at
AF: Vienna University of Technology, Gusshausstrasse 27-29, Vienna, 1040, Austria
AU: Mendes Cerveira, P J
EM: mendes@mars.hg.tuwien.ac.at
AF: Vienna University of Technology, Gusshausstrasse 27-29, Vienna, 1040, Austria
AU: Schuh, H
EM: harald.schuh@tuwien.ac.at
AF: Vienna University of Technology, Gusshausstrasse 27-29, Vienna, 1040, Austria
AB: We investigate the application of different classes of data from the European Centre for Medium-Range Weather Forecasts (ECMWF) and different geophysical models for the determination of axial and equatorial effective atmospheric angular momentum functions (EAAMF). Sixty model levels are compared vs. 21 pressure levels (from 1000 down to 1 hPa), the horizontal spatial resolution is decreased up to 0.25 degrees, and the 6-hours temporal resolution is reduced to 3-hours steps from forecasting data. In terms of geophysical models, first we compare the rigorous approach for the matter terms with the simplified surface pressure approach, then we investigate both, IB and non-IB approaches, and finally we check the influence of different height models for the Earth topography upon the AMF. We derive these sets of EAAMF for the CONT05 time span, a 15 days continuous Very Long Baseline Interferometry (VLBI) campaign in September 2005. Geophysical EAAMF are compared to the geodetic ones. The latter are obtained from time series of polar motion and length of day with a temporal resolution of 3 hours. The frequency dependence of both types of functions will be investigated. Finally, we show results from the implementation of the algorithms at the ECMWF for routine processing, and how these can be accessed.
DE: 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions (0762, 1218, 3319, 4550)
DE: 1239 Earth rotation variations
DE: 1240 Satellite geodesy: results (6929, 7215, 7230, 7240)
SC: Geodesy [G]
MN: 2007 Fall Meeting