Alaska Science Center
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CONFERENCESSCIENCE TOPICSABOUT THE ALASKA
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Alaska Science CenterWelcome to the U.S. Geological Survey (USGS) Web page for the resources of Alaska. We are providing timely, relevant, and impartial study of the landscape, natural resources, and natural hazards for Alaska and our nation. In the SpotlightImpacts of the 2008 Kasatochi Volcano EruptionOn August 7, 2008, Kasatochi Volcano, located in the central Aleutian Islands, erupted catastrophically, covering the island with ash and hot pyroclastic flow material. Kasatochi was an annual monitoring site of the U.S. Fish and Wildlife Service, Alaska Maritime National Wildlife Refuge (AMNWR), thus features of the island's terrestrial and nearshore ecosystems were well known. In 2009, the U.S. Geological Survey, AMNWR, and the University of Alaska Fairbanks initiated long-term studies to better understand the effects of the eruption and the role volcanism plays in structuring ecosystems in the Aleutian Islands, a volcano-dominated region with high natural resource values. Go to the Kasatochi website to learn more about Kasatochi and these multi-disciplinary research projects. Walrus Tracking in the southern Chukchi SeaResearchers attached satellite radio-tags to walruses to help describe walrus movements, foraging areas, and sea ice habitats in the Chukchi Sea. Thirty-four walruses were tagged in early June during the 2009 spring northward migration, six in early July near Barrow, and sixteen in mid-September near Icy Cape during the sea ice minimum. View this animation to see walrus locations through mid-November. Rapid erosion along an Arctic coastlineIn an effort to gain a better understanding of the processes driving reported increases in coastal erosion along the Beaufort Sea coast of Alaska we established an erosion monitoring station that consisted of a time-lapse camera and other instrumentation in the nearshore environment. This video clip shows one photo a day from 11 July 2009 to 22 August 2009. At the beginning of the time-series, blocks that had collapsed during 2008 are seen abutting the bluff. These blocks are completely removed by the 17 July 2009 and the sea begins to cut another erosional niche that will ultimately lead to the block collapse occurring on 03 August 2009. This large block (measuring 6m x 10m x 2m) is then degraded within five days. Removal of this block allows for the development of another niche and block collapse episode. An increase in the number of these events per year is likely responsible for the increase in land loss along this Arctic coastline. Beaufort Sea Coast Erosion (video) Current Highlights
Alaska Science Portal
Science FeaturesUSGS Factsheet: Pacific Walrus Response to Arctic Sea Ice Losses
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