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Spatial cross-correlation of Antarctic Sea ice and seabed topographyA time series of derived sea ice concentrations as observed about Antarctica by the Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR) satellite in 1983 is considered. The degree of spatial cross correlation between these data and seabed topography is quantified. The approach is to implement a statistical image processing filter designed to extract local patterns of spatial cross correlation over the entire sea ice field as it undergoes daily changes. Throughout the sea ice, it was found that large scale variations in sea ice concentration correlate systematically with variations in the topography of the seabed. Generally speaking, high concentrations of sea ice occur over deep ocean, whereas areas of encavement, early dissipation and polynya formation develop over topographic features of high elevation. The latter was studied in detail with respect to the features Maud Rise, Astrid Ridge and the continental shelf in the Cosmonaut and Ross Seas. In each case, it is shown that an encavement in sea ice, a polynya, or both develops in the vicinity of the feature in question. As these results are quantified in terms of spatial cross correlation, a potential role is inferred for seabed topography in such fluctuations in the sea ice about Antarctica.
Document ID
19900017135
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Deveaux, Richard D. (Princeton Univ. NJ, United States)
Phelan, Michael J. (Princeton Univ. NJ, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Subject Category
Oceanography
Report/Patent Number
NASA-CR-186815
NAS 1.26:186815
Accession Number
90N26451
Funding Number(s)
CONTRACT_GRANT: NAGW-1763
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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