Bathymetry estimates in the southern oceans from Seasat altimetry

A 70-day Seasat altimeter set, where altitude was determined by the delay of a radar signal before return, was high pass filtered to obtain bathymetric data on the southern ocean. Variations were estimated over cross-track passages over the same points, and longer wavelength effects were removed to...

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Bibliographic Details
Published in:Nature (London) 1983-08, Vol.304 (5925), p.406-411
Main Authors: Dixon, T. H., Parke, M. E.
Format: Article
Language:English
Subjects:
altimeters
bathymetric data
bottom topography
Earth sciences
Earth, ocean, space
Exact sciences and technology
filtering
geosensing
Humanities and Social Sciences
Marine
Marine geology
multidisciplinary
Oceanography
remote sensing
satellite sensing
satellites
Science
Science (multidisciplinary)
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Summary:A 70-day Seasat altimeter set, where altitude was determined by the delay of a radar signal before return, was high pass filtered to obtain bathymetric data on the southern ocean. Variations were estimated over cross-track passages over the same points, and longer wavelength effects were removed to reveal the shorter wavelength geoid features. Edge effects near land, subtle geoid structure features at continental margins, smaller boundary seas, and lakes were preserved by the high pass filter, which involved substracting a constant height from each 6 x 6 deg square region. A volcanic origin was indicated for the nearly continuous Louisville Ridge, which had a major elongate plateau or positive gravity anomaly located just eastward and running east-west. A large Conrad Ridge was found in the Indian Ocean, compared to previous charts. The Indian Ocean was also found to contain more rises and plateaus than previously mapped.
ISSN:0028-0836
1476-4687
DOI:10.1038/304406a0