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...

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Published in:Permafrost and Periglacial Processes
Main Author: Cunhai Gao
Format: Article in Journal/Newspaper
Language:unknown
Subjects:
permafrost
Online Access:https://doi.org/10.1002/ppp.1803
id ftrepec:oai:RePEc:wly:perpro:v:25:y:2014:i:2:p:144-149
record_format openpolar
spelling 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
institution 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
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