Movie:Arctic Coastal Erosion- Melting Block 2010
Information Page: Arctic Coastal Erosion- Melting Block 2010
Arctic Coastal Erosion_Melting Block
|Domain:||terrestrial, hydrology, coastal, marine|
|Keywords:||Arctic Alaska, Permafrost Melt, Waves, Thermal erosion, Sea Ice free season|
|Model name:||Animation model name|
and EIS-Extreme Ice Survey
|Where:||Drew Point, Alaska, Beaufort Sea Coast, USA|
|When:||August 13th-22nd, 2010|
Grade level: Middle (6-8), High (9-12), Under graduate (13-16), Graduate / Professional
Statement: Melting of a toppled block of permafrost coast
Abstract: Long stretches of permafrost coast in the Arctic region consist of ice-rich sediments. These permafrost areas have been experiencing rapid warming over the last decades. The warming melts the permafrost, but it also exposes the coast longer to the forces of the ocean because the sea-ice free season has expanded.
This particular movie shows the permafrost coast near DrewPoint, along the Alaskan Beaufort Sea. At Drew Point, there are nowadays about twice as many days of open water than in the late 1970's. This results in more absorption of heat in the ocean water. The bluff is approximately 4.5 m high, and the block in the movies is about 13 m long. The block is not necessarily eroded by waves, but also just by melt ( this is called - thermal erosion). The warm sea water needs to touch the block and then rapid melt will occur. The massive block disappears in about a week.
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