Bottom pressure tides along a line in the southeast Atlantic Ocean and comparisons with satellite altimetry |
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Authors: | Richard D Ray Deirdre A Byrne |
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Institution: | (1) NASA Goddard Space Flight Center, Greenbelt, MD, USA;(2) School of Marine Sciences, University of Maine, Orono, ME, USA |
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Abstract: | Seafloor pressure records, collected at 11 stations aligned along a single ground track of the Topex/Poseidon and Jason satellites,
are analyzed for their tidal content. With very low background noise levels and approximately 27 months of high-quality records,
tidal constituents can be estimated with unusually high precision. This includes many high-frequency lines up through the
seventh-diurnal band. The station deployment provides a unique opportunity to compare with tides estimated from satellite
altimetry, point by point along the satellite track, in a region of moderately high mesoscale variability. That variability
can significantly corrupt altimeter-based tide estimates, even with 17 years of data. A method to improve the along-track
altimeter estimates by correcting the data for non-tidal variability is found to yield much better agreement with the bottom-pressure
data. The technique should prove useful in certain demanding applications, such as altimetric studies of internal tides. |
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