Relict Thermal‐contraction‐crack Polygons and Past Permafrost South of the Late Wisconsinan Glacial Limit in the Mid‐Atlantic Coastal Plain, USA
The paucity of reports on relict thermal contraction crack polygons in the mid‐Atlantic Coastal Plain and many other areas in eastern North America has hampered our understanding of the extent and nature of past permafrost south of the Late Wisconsinan glacial limit. Examination of Google Earth™ ima...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.1803 |
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ftrepec:oai:RePEc:wly:perpro:v:25:y:2014:i:2:p:144-149 2023-05-15T17:56:44+02:00 Relict Thermal‐contraction‐crack Polygons and Past Permafrost South of the Late Wisconsinan Glacial Limit in the Mid‐Atlantic Coastal Plain, USA Cunhai Gao https://doi.org/10.1002/ppp.1803 unknown https://doi.org/10.1002/ppp.1803 article ftrepec https://doi.org/10.1002/ppp.1803 2020-12-04T13:31:25Z The paucity of reports on relict thermal contraction crack polygons in the mid‐Atlantic Coastal Plain and many other areas in eastern North America has hampered our understanding of the extent and nature of past permafrost south of the Late Wisconsinan glacial limit. Examination of Google Earth™ imagery revealed orthogonal to hexagonal polygons, mostly 10–30 m in diameter, at more than 160 sites in sand and gravel deposits in southern New Jersey and the Delmarva Peninsula. The polygons are interpreted to indicate that continuous permafrost extended to 38.5°N in a zone more than 250 km wide to the south of the glacial limit under a mean annual air temperature of ≤ −6°C probably during the Late Wisconsinan. Copyright © 2014 John Wiley & Sons, Ltd. Article in Journal/Newspaper permafrost RePEc (Research Papers in Economics) Permafrost and Periglacial Processes 25 2 144 149 |
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Open Polar |
collection |
RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
The paucity of reports on relict thermal contraction crack polygons in the mid‐Atlantic Coastal Plain and many other areas in eastern North America has hampered our understanding of the extent and nature of past permafrost south of the Late Wisconsinan glacial limit. Examination of Google Earth™ imagery revealed orthogonal to hexagonal polygons, mostly 10–30 m in diameter, at more than 160 sites in sand and gravel deposits in southern New Jersey and the Delmarva Peninsula. The polygons are interpreted to indicate that continuous permafrost extended to 38.5°N in a zone more than 250 km wide to the south of the glacial limit under a mean annual air temperature of ≤ −6°C probably during the Late Wisconsinan. Copyright © 2014 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Cunhai Gao |
spellingShingle |
Cunhai Gao Relict Thermal‐contraction‐crack Polygons and Past Permafrost South of the Late Wisconsinan Glacial Limit in the Mid‐Atlantic Coastal Plain, USA |
author_facet |
Cunhai Gao |
author_sort |
Cunhai Gao |
title |
Relict Thermal‐contraction‐crack Polygons and Past Permafrost South of the Late Wisconsinan Glacial Limit in the Mid‐Atlantic Coastal Plain, USA |
title_short |
Relict Thermal‐contraction‐crack Polygons and Past Permafrost South of the Late Wisconsinan Glacial Limit in the Mid‐Atlantic Coastal Plain, USA |
title_full |
Relict Thermal‐contraction‐crack Polygons and Past Permafrost South of the Late Wisconsinan Glacial Limit in the Mid‐Atlantic Coastal Plain, USA |
title_fullStr |
Relict Thermal‐contraction‐crack Polygons and Past Permafrost South of the Late Wisconsinan Glacial Limit in the Mid‐Atlantic Coastal Plain, USA |
title_full_unstemmed |
Relict Thermal‐contraction‐crack Polygons and Past Permafrost South of the Late Wisconsinan Glacial Limit in the Mid‐Atlantic Coastal Plain, USA |
title_sort |
relict thermal‐contraction‐crack polygons and past permafrost south of the late wisconsinan glacial limit in the mid‐atlantic coastal plain, usa |
url |
https://doi.org/10.1002/ppp.1803 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
https://doi.org/10.1002/ppp.1803 |
op_doi |
https://doi.org/10.1002/ppp.1803 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
25 |
container_issue |
2 |
container_start_page |
144 |
op_container_end_page |
149 |
_version_ |
1766164999458258944 |