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GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 18, 1970, doi:10.1029/2003GL018031, 2003

30-Year satellite record reveals contrasting Arctic and Antarctic decadal sea ice variability

D. J. Cavalieri

Laboratory for Hydrospheric Processes, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA


C. L. Parkinson

Laboratory for Hydrospheric Processes, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA


K. Y. Vinnikov

Department of Meteorology, University of Maryland, College Park, Maryland, USA


Abstract

A 30-year satellite record of sea ice extents derived mostly from satellite microwave radiometer observations reveals that the Arctic sea ice extent decreased by 0.30 ± 0.03 × 106 km2/10 yr from 1972 through 2002, but by 0.36 ± 0.05 × 106km2/10yr from 1979 through 2002, indicating an acceleration of 20% in the rate of decrease. In contrast, the Antarctic sea ice extent decreased dramatically over the period 1973–1977, then gradually increased. Over the full 30-year period, the Antarctic ice extent decreased by 0.15 ± 0.08 × 106 km2/10 yr. The trend reversal is attributed to a large positive anomaly in Antarctic sea ice extent in the early 1970's, an anomaly that apparently began in the late 1960's, as observed in early visible and infrared satellite images.

Received 23 June 2003; accepted 15 August 2003; published 30 September 2003.

Index Terms: 4207 Oceanography: General: Arctic and Antarctic oceanography; 4275 Oceanography: General: Remote sensing and electromagnetic processes (0689); 4227 Oceanography: General: Diurnal, seasonal, and annual cycles.

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Citation: Cavalieri, D. J., C. L. Parkinson, and K. Y. Vinnikov (2003), 30-Year satellite record reveals contrasting Arctic and Antarctic decadal sea ice variability, Geophys. Res. Lett., 30(18), 1970, doi:10.1029/2003GL018031.