Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1765417 | Advances in Space Research | 2010 | 18 Pages |
Abstract
The present paper is focused on the global spatial (altitude and latitude) structure, seasonal and interannual variability of the most stable in amplitude and phase eastward propagating diurnal and semidiurnal tides with zonal wavenumbers 2 and 3 derived from the SABER/TIMED temperatures for full 6 years (January 2002-December 2007). The tidal results are obtained by an analysis method where the tides (migrating and nonmigrating) and the planetary waves (zonally travelling, zonally symmetric and stationary) are simultaneously extracted from the satellite data. It has been found that the structures of the eastward propagating diurnal tides with zonal wavenumbers 3 and 2 change from antisymmetric with respect to the equator below â¼85 km height, to more symmetric above â¼95 km. The seasonal behavior of the DE3 is dominated by annual variation with maximum in August-September reaching average (2002-2007) amplitude of â¼15 K, while that of the DE2 by semiannual variation with solstice maxima and with average amplitude of â¼8 K. These tides revealed some interannual variability with a period of quasi-2 years. The seasonal behavior of the eastward propagating semidiurnal tide with zonal wavenumber 2 in the southern hemisphere (SH) is dominated by annual variation with maximum in the austral summer (November-January) while that in the northern hemisphere (NH) by semiannual variation with equinoctial maxima. The SE2 maximizes near 115 km height and at latitude of â¼30° reaching an average amplitude of â¼6 K. The seasonal behavior of the eastward propagating semidiurnal tide with zonal wavenumber 3 in both hemispheres indicates a main maximum during June solstice and a secondary one during December solstice. The tide maximizes near 110-115 km height and at a latitude of â¼30° reaching an average amplitude of â¼4.8 K in the SH and â¼4 K in the NH. The tidal structures of the two eastward propagating semidiurnal tides are predominantly antisymmetric about the equator.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
D. Pancheva, P. Mukhtarov, B. Andonov,