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The Arctic Ocean ice balance - A Kalman smoother estimateThe methodology of Kalman filtering and smoothing is used to integrate a 7-year time series of buoy-derived ice motion fields and satellite passive microwave observations. The result is a record of the concentrations of open water, first-year ice, and multiyear ice that we believe is better than the estimates based on the microwave data alone. The Kalman procedure interprets the evolution of the ice cover in terms of advection, melt, growth, ridging, and aging of first-year into multiyear ice. Generally, the regions along the coasts of Alaska and Siberia and the area just north of Fram Strait are sources of first-year ice, with the rest of the Arctic Ocean acting as a sink for first-year ice via ridging and aging. All the Arctic Ocean except for the Beaufort and Chukchi seas is a source of multiyear ice, with the Chukchi being the only internal multiyear ice sink. Export through Fram Strait is a major ice sink, but we find only about two-thirds the export and greater interannual variation than found in previous studies. There is no discernible trend in the area of multiyear ice in the Arctic Ocean during the 7 years.
Document ID
19930061884
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Thomas, D. R.
(NASA Headquarters Washington, DC United States)
Rothrock, D. A.
(Washington Univ. Seattle, United States)
Date Acquired
August 16, 2013
Publication Date
June 15, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: C6
ISSN: 0148-0227
Subject Category
Oceanography
Accession Number
93A45881
Funding Number(s)
CONTRACT_GRANT: NAGW-2513
CONTRACT_GRANT: NSF DPP-88-22314
CONTRACT_GRANT: NAGW-2407
Distribution Limits
Public
Copyright
Other

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