Temporal Variations in the Second-Degree Stokes Tesseral Geopotential Coefficients from Topex/Poseidon Altimetry

Details Temporal Variations in the Second-Degree Stokes Tesseral Geopotential Coefficients from Topex/Poseidon Altimetry Temporal Variations in the Second-Degree Stokes Tesseral Geopotential Coefficients from Topex/Poseidon Altimetry

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003em%26p...93...37b&link_type=abstract

Earth, Moon, and Planets, v. 93, Issue 1, p. 37-64 (2003).

Computer Science

1

T/P Altimetry, Stokes 2-Nd Degree Tesseral Coefficients-Variations, Polar Motion

Scientific paper

The TOPEX/POSEIDON (T/P) altimetry data set covering the period of January 1, 1993 to January 3, 2001 was used to derive monthly series of the second-degree tesseral geopotential coefficients. To account for the sea water temperature variations, rather simple models have been devised and discussed, describing localized as well as areal variations of sea water temperature and heights. The second-degree tesseral coefficients have also been shown to be proportional to the pressure portions of the oceanic equatorial effective excitation functions, used in Ocean Angular Momentum (OAM) data. OAM data together with Atmospheric Angular Momentum (AAM) data can be used to study observed polar motion (PM) series. The excess PM rates, derived from the T/P effective excitation functions, were compared to the corresponding observed PM rates, derived from the International Earth Rotation Service (IERS) Bulletin A and corrected with AAM also obtained from IERS. The noise of the T/P derived PM rate series was found to be significantly larger than the corresponding Bulletin A/AAM PM rate residuals as well as the PM rates derived from an independent OAM series that was also available for the 1993-2000 period.

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