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Minimal offshore extent of ice-bearing (subsea) permafrost on the U.S. Beaufort Sea margin

Dates

Publication Date
Start Date
1977-01-01
End Date
1990-12-31

Citation

Brothers, L.L., Ruppel, C.D., Hart, P.E., and Herman, B.M., 2019, Minimal offshore extent of ice-bearing (subsea) permafrost on the U.S. Beaufort Sea margin: U.S. Geological Survey data release, https://doi.org/10.5066/P96FB9F7.

Summary

The present-day distribution of subsea permafrost beneath high-latitude continental shelves has implications for sea level rise and climate change since the Last Glacial Maximum (~20,000 years ago). Because permafrost can be spatially associated with gas hydrate (which may be thermodynamically stable within the several hundred meters above and below the base of permafrost), the contemporary distribution of subsea permafrost also has implications for the persistence of permafrost-associated gas hydrate beneath shallow waters at high latitudes, particularly on margins that were not glaciated at the Last Glacial Maximum. On the U.S. Beaufort Sea margin offshore northern Alaska, researchers have sometimes assumed that contemporary subsea [...]

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Attached Files

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AlaskasubseaIBPF_USGS.png
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thumbnail 3.73 MB
AlaskasubseaIBPF_USGS.zip
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3.66 MB

Purpose

This shapefile was formulated for the purpose of delineating the 2000 meter per second (m/s) contour for average sediment velocities calculated for the first 750 milliseconds of two-way travel time from legacy seismic reflection records collected near the Alaskan coastline bordering the U.S. Beaufort Sea. The 2000 m/s averaged sediment velocity contour is interpreted as the contemporary seaward extent of ice-bearing permafrost (subsea permafrost) on the U.S. Beaufort Sea margin (Arctic Ocean) offshore northern Alaska.

Additional Information

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DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P96FB9F7

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