Sea ice loss enhances wave action at the Arctic coast

Details Sea ice loss enhances wave action at the Arctic coast Sea ice loss enhances wave action at the Arctic coast

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3817503o&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 17, CiteID L17503

Physics

Geophysics

1

Cryosphere: Sea Ice (4540), Global Change: Cryospheric Change (0776), Marine Geology And Geophysics: Continental Shelf And Slope Processes (4219), Oceanography: General: Coastal Processes

Scientific paper

Erosion rates of permafrost coasts along the Beaufort Sea accelerated over the past 50 years synchronously with Arctic-wide declines in sea ice extent, suggesting a causal relationship between the two. A fetch-limited wave model driven by sea ice position and local wind data from northern Alaska indicates that the exposure of permafrost bluffs to seawater increased by a factor of 2.5 during 1979-2009. The duration of the open water season expanded from ˜45 days to ˜95 days. Open water expanded more rapidly toward the fall (˜0.92 day yr-1), when sea surface temperatures are cooler, than into the mid-summer (˜0.71 days yr-1).Time-lapse imagery demonstrates the relatively efficient erosive action of a single storm in August. Sea surface temperatures have already decreased significantly by fall, reducing the potential impact of thermal erosion due to fall season storm waves.

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