Topex/Poseidon Altimetry and Dynamics of the Ocean-Atmosphere System |
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Authors: | Milan Bur?a Jan Kouba Viliam Vatrt Vojtěch Vítek Marie Vojtí?ková |
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Institution: | (1) Astronomical Institute, Acad. Sci. Czech Republic, Boni II/1401, 141 31, Prague 4, Czech Republic;(2) Geodetic Survey Division, Natural Resources Canada, 615 Booth Str, Ottawa, KIAOE9, Canada;(3) Topographical Institute VTOPÚ, Topographical Service of the Army of the Czech Republic, 518 01 Dobruka, Czech Republic;(4) Lipnická 1219, 396 01 Humpolec, Czech Republic |
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Abstract: | The T/P altimeter data 1993 – 1997 (cycles 11 – 194) has been analyzed with emphases on seasonal variations in sea surface topography (SST). The amplitude of the annual variations amounted to (5.9±0.3) mm when inverted barometer (IB) corrections were applied and (2.0±0.4) mm without any IB corrections. The amplitude of the semi-annual variations in SST was small with IB corrections applied: (0.6±0.3) mm. However, when no IB corrections were applied, it was (1.8±0.4) mm, i.e. the semiannual variations are at the same level as the annual variations with no IB corrections. The phase angle offset of the annual term has shifted by about 180° when IB correction was applied. The dynamics of the ocean-atmosphere system is discussed and it is concluded that it could, at least partly, be responsible for the above observed effects. |
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Keywords: | Sea surface altimetry variations |
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