This is a commentary on DOI:10.1029/2007JC004564
Arctic sea ice variability and trends, 1979–2006
Article first published online: 1 JUL 2008
Copyright 2008 by the American Geophysical Union.
Journal of Geophysical Research: Oceans (1978–2012)
Volume 113, Issue C7, July 2008
How to Cite
2008), Arctic sea ice variability and trends, 1979–2006, J. Geophys. Res., 113, C07003, doi:10.1029/2007JC004558., and (
- Issue published online: 1 JUL 2008
- Article first published online: 1 JUL 2008
- Manuscript Accepted: 5 MAR 2008
- Manuscript Revised: 25 JAN 2008
- Manuscript Received: 18 SEP 2007
- sea ice;
- climate change;
 Analysis of Arctic sea ice extents derived from satellite passive-microwave data for the 28 years 1979–2006 yields an overall negative trend of −45,100 ± 4,600 km2/a (−3.7 ± 0.4%/decade) in the yearly averages, with negative ice extent trends also occurring for each of the four seasons and each of the 12 months. For the yearly averages, the largest decreases occur in the Kara and Barents seas and the Arctic Ocean, with linear least squares slopes of −10,600 ± 2,800 km2/a (−7.4 ± 2.0%/decade) and −10,100 ± 2,200 km2/a (−1.5 ± 0.3%/decade), respectively, followed by Baffin Bay/Labrador Sea, with a slope of −8000 ± 2000 km2/a (−9.0 ± 2.3%/decade), the Greenland Sea, with a slope of −7000 ± 1400 km2/a (−9.3 ± 1.9%/decade), and Hudson Bay, with a slope of −4500 ± 900 km2/a (−5.3 ± 1.1%/decade). These are all statistically significant decreases at a 99% confidence level. The seas of Okhotsk and Japan also have a statistically significant ice decrease, although at a 95% confidence level, and the three remaining regions, the Bering Sea, Canadian Archipelago, and Gulf of St. Lawrence, have negative slopes that are not statistically significant. The 28-year trends in ice areas for the Northern Hemisphere total are also statistically significant and negative in each season, each month, and for the yearly averages.