Role of ocean variability and dynamic ocean topography in the recovery of the mean sea surface and gravity anomalies from satellite altimeter data |
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Authors: | R H Rapp Y Yi |
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Institution: | (1) Department of Civil and Environmental Engineering and Geodetic Science, Ohio State University, 470 Hitchcock Hall, 2070 Neil Avenue, Columbus, O 43210, USA Phone: +1614 292 6005; e-mail: rapp.1@osu.edu, US |
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Abstract: | Procedures to calculate mean sea surface heights and gravity anomalies from altimeter-derived sea surface heights and along-track
sea surface slopes using the least-squares collocation procedure are derived. The slope data is used when repeat track averaging
is not possible to reduce ocean variability effects. Tests were carried out using Topex, Geosat, ERS-1 35-day and 168-day
(2 cycle)] data. Calculations of gravity anomalies in the Gulf Stream region were made using the sea surface height and slope
data. Tests were also made correcting the sea surface heights for dynamic ocean topography calculated from a degree 360 expansion
of data from the POCM-4B global ocean circulation model. Comparisons of the anomaly predictions were carried out with ship
data using anomalies calculated for this paper as well as others.
Received: 19 August 1996 / Accepted: 14 April 1997 |
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Keywords: | , Altimeter data ,, ,Gravity anomalies Dynamic topography |
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