Articles | Volume 10, issue 5
https://doi.org/10.5194/tc-10-2027-2016
https://doi.org/10.5194/tc-10-2027-2016
Research article
 | 
14 Sep 2016
Research article |  | 14 Sep 2016

Sea-ice indicators of polar bear habitat

Harry L. Stern and Kristin L. Laidre

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Revised manuscript accepted for TC
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Cited articles

Amante, C. and Eakins, B. W.: ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis, NOAA Technical Memorandum NESDIS NGDC-24, National Geophysical Data Center, NOAA, https://doi.org/10.7289/V5C8276M, 2009.
Amstrup, S. C., Marcot, B. G., and Douglas, D. C.: A Bayesian network modeling approach to forecasting the 21st century worldwide status of polar bears, in: Arctic Sea Ice Decline: Observations, Projections, Mechanisms and Implications, edited by: DeWeaver, E. T., Bitz, C. M., and Tremblay, L. B., Geophysical Monograph Series 180, American Geophysical Union, Washington, DC, USA, 213–268, 2008.
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Polar bears, found in 19 distinct regions of the Arctic, depend on sea ice as a platform for hunting. Using satellite data of sea ice for the period 1979–2014, we found that the date of sea-ice retreat in spring is arriving weeks earlier, and the date of sea-ice advance in fall is arriving weeks later, in all 19 regions. We calculated several other measures of sea ice, which all show declines. These measures were designed to be useful for management agencies to assess polar bear habitat.