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Baked Alaksa, Permafrost

by: Jeanne Arnson-Serotta

Baked Alaksa, Permafrost MSC 101

Marketplace > MSC 101 > Baked Alaksa Permafrost
Jeanne Arnson-Serotta
Survey of Oceanography
John Van Leer

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Survey of Oceanography
John Van Leer
Class Notes
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This 1 page Class Notes was uploaded by Jeanne Arnson-Serotta on Sunday October 18, 2015. The Class Notes belongs to MSC 101 at a university taught by John Van Leer in Fall 2015. Since its upload, it has received 34 views.

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Date Created: 10/18/15
9815 Baked Alaska a Look at Permafrost Permafrost covers about 22 of the land area of the North Hemisphere Permafrost formed on the arctic continental shelves during the last Northern Hemisphere Glaciation Back then global sea level was lower by about 400 20000 years before present exposing the continental shelves to atmospheric freezing The upper 30 to 300 contains no ice due to past melting but it is frozen solid below that depth to an unknown thickness These continental shelf permafrost deposits are now melting at an accelerating rate as the Arctic Ocean has warmed about SC in the rapidly growing ice free areas Permafrost holds twice the amount of carbon than today s atmosphere contains The Tundra is often divided up into pieces similar to polygons about 50 to 100 across and are like small lakes underlain by deep permafrost and horizontal ice lenses o In spite of low precipitation on the north slope there is standing water in these shallow summer lakes because the permafrost prevents water from soaking into the ground 0 These breaks in the ice are due to the thermal contraction of the soil During the winter the ground will contract from cold temperatures until it needs to release stress by cracking similar to cracking of dried mud flats but much larger The Fox Permafrost Tunnel has provided access inside the permafrost needed to conveniently study its internal structure Loess is produced by glaciers grinding rocks into a fine powder s visible when melted glacier water meets a fresh stream and the fish have trouble living with a lot of loess in the water The permafrost melting due to climate change can damage buildings and pipelines as the ground begins to melt The Trans Alaska Pipeline route was built in parallel with the Haul Road which provided access machines and materials from Fairbanks northward to the Arctic Ocean across tundra and permafrost Sea ice volume has dropped by 50 during the past three years


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