Periglacial Appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern USA
Abstract Locational data for 96 allochthonous blockfields distributed throughout the Appalachian Mountains of eastern USA were obtained using TerraServer , an online resource for viewing air‐photo and satellite imagery. The elevation of Appalachian blockfields south of the Last Glacial Maximum (LGM)...
Published in: | Permafrost and Periglacial Processes |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2007
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1002/ppp.574 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.574 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.574 |
id |
crwiley:10.1002/ppp.574 |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1002/ppp.574 2024-09-15T18:30:03+00:00 Periglacial Appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern USA Nelson, Kim J. Park Nelson, Frederick E. Walegur, Michael T. 2007 http://dx.doi.org/10.1002/ppp.574 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.574 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.574 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 18, issue 1, page 61-73 ISSN 1045-6740 1099-1530 journal-article 2007 crwiley https://doi.org/10.1002/ppp.574 2024-08-06T04:13:07Z Abstract Locational data for 96 allochthonous blockfields distributed throughout the Appalachian Mountains of eastern USA were obtained using TerraServer , an online resource for viewing air‐photo and satellite imagery. The elevation of Appalachian blockfields south of the Last Glacial Maximum (LGM) border parallels regional gradients of contemporary mean July, summer and annual temperature. Mean July temperature reductions inferred from palaeoecological studies indicate that the median elevation of blockfields throughout the Appalachians lay at or above timberline during the LGM. Palaeotemperatures calculated using known Appalachian lapse rates and published LGM temperature departures indicate that most blockfields in the study area were formed under climatic conditions conducive to permafrost. Allochthonous blockfields in the Appalachians appear to be constituent elements of periglacial ‘form communities’. Internet‐based map products can be used to create generalised reconnaissance‐level geomorphic data bases over large areas. Complementary use of these resources and spatial‐analytic techniques holds considerable potential for addressing the broad‐scale problems with which traditional climatic geomorphology is concerned. Copyright © 2007 John Wiley & Sons, Ltd. Article in Journal/Newspaper permafrost Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes 18 1 61 73 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Abstract Locational data for 96 allochthonous blockfields distributed throughout the Appalachian Mountains of eastern USA were obtained using TerraServer , an online resource for viewing air‐photo and satellite imagery. The elevation of Appalachian blockfields south of the Last Glacial Maximum (LGM) border parallels regional gradients of contemporary mean July, summer and annual temperature. Mean July temperature reductions inferred from palaeoecological studies indicate that the median elevation of blockfields throughout the Appalachians lay at or above timberline during the LGM. Palaeotemperatures calculated using known Appalachian lapse rates and published LGM temperature departures indicate that most blockfields in the study area were formed under climatic conditions conducive to permafrost. Allochthonous blockfields in the Appalachians appear to be constituent elements of periglacial ‘form communities’. Internet‐based map products can be used to create generalised reconnaissance‐level geomorphic data bases over large areas. Complementary use of these resources and spatial‐analytic techniques holds considerable potential for addressing the broad‐scale problems with which traditional climatic geomorphology is concerned. Copyright © 2007 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Nelson, Kim J. Park Nelson, Frederick E. Walegur, Michael T. |
spellingShingle |
Nelson, Kim J. Park Nelson, Frederick E. Walegur, Michael T. Periglacial Appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern USA |
author_facet |
Nelson, Kim J. Park Nelson, Frederick E. Walegur, Michael T. |
author_sort |
Nelson, Kim J. Park |
title |
Periglacial Appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern USA |
title_short |
Periglacial Appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern USA |
title_full |
Periglacial Appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern USA |
title_fullStr |
Periglacial Appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern USA |
title_full_unstemmed |
Periglacial Appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern USA |
title_sort |
periglacial appalachia: palaeoclimatic significance of blockfield elevation gradients, eastern usa |
publisher |
Wiley |
publishDate |
2007 |
url |
http://dx.doi.org/10.1002/ppp.574 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.574 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.574 |
genre |
permafrost Permafrost and Periglacial Processes |
genre_facet |
permafrost Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 18, issue 1, page 61-73 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.574 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
18 |
container_issue |
1 |
container_start_page |
61 |
op_container_end_page |
73 |
_version_ |
1810471536950247424 |