Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA
ABSTRACT Investigations on the northern Seward Peninsula in Alaska identified zones of recent (<50 years) permafrost collapse that led to the formation of floating vegetation mats along thermokarst lake margins. The occurrence of floating vegetation mat features indicates rapid degradation of nea...
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crwiley:10.1002/esp.2210 2024-06-23T07:56:05+00:00 Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA Parsekian, Andrew D. Jones, Benjamin M. Jones, Miriam Grosse, Guido Walter Anthony, Katey M. Slater, Lee 2011 http://dx.doi.org/10.1002/esp.2210 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.2210 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.2210 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/esp.2210 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Earth Surface Processes and Landforms volume 36, issue 14, page 1889-1897 ISSN 0197-9337 1096-9837 journal-article 2011 crwiley https://doi.org/10.1002/esp.2210 2024-06-04T06:42:01Z ABSTRACT Investigations on the northern Seward Peninsula in Alaska identified zones of recent (<50 years) permafrost collapse that led to the formation of floating vegetation mats along thermokarst lake margins. The occurrence of floating vegetation mat features indicates rapid degradation of near‐surface permafrost and lake expansion. This paper reports on the recent expansion of these collapse features and their geometry is determined using geophysical and remote sensing measurements. The vegetation mats were observed to have an average thickness of 0.57 m and petrophysical modeling indicated that gas content of 1.5–5% enabled floatation above the lake surface. Furthermore, geophysical investigation provides evidence that the mats form by thaw and subsidence of the underlying permafrost rather than terrestrialization. The temperature of the water below a vegetation mat was observed to remain above freezing late in the winter. Analysis of satellite and aerial imagery indicates that these features have expanded at maximum rates of 1–2 m yr ‐1 over a 56 year period. Including the spatial coverage of floating ‘thermokarst mats’ increases estimates of lake area by as much as 4% in some lakes. Copyright © 2011 John Wiley & Sons, Ltd. Article in Journal/Newspaper permafrost Seward Peninsula Thermokarst Alaska Wiley Online Library Earth Surface Processes and Landforms 36 14 1889 1897 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
ABSTRACT Investigations on the northern Seward Peninsula in Alaska identified zones of recent (<50 years) permafrost collapse that led to the formation of floating vegetation mats along thermokarst lake margins. The occurrence of floating vegetation mat features indicates rapid degradation of near‐surface permafrost and lake expansion. This paper reports on the recent expansion of these collapse features and their geometry is determined using geophysical and remote sensing measurements. The vegetation mats were observed to have an average thickness of 0.57 m and petrophysical modeling indicated that gas content of 1.5–5% enabled floatation above the lake surface. Furthermore, geophysical investigation provides evidence that the mats form by thaw and subsidence of the underlying permafrost rather than terrestrialization. The temperature of the water below a vegetation mat was observed to remain above freezing late in the winter. Analysis of satellite and aerial imagery indicates that these features have expanded at maximum rates of 1–2 m yr ‐1 over a 56 year period. Including the spatial coverage of floating ‘thermokarst mats’ increases estimates of lake area by as much as 4% in some lakes. Copyright © 2011 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Parsekian, Andrew D. Jones, Benjamin M. Jones, Miriam Grosse, Guido Walter Anthony, Katey M. Slater, Lee |
spellingShingle |
Parsekian, Andrew D. Jones, Benjamin M. Jones, Miriam Grosse, Guido Walter Anthony, Katey M. Slater, Lee Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA |
author_facet |
Parsekian, Andrew D. Jones, Benjamin M. Jones, Miriam Grosse, Guido Walter Anthony, Katey M. Slater, Lee |
author_sort |
Parsekian, Andrew D. |
title |
Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA |
title_short |
Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA |
title_full |
Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA |
title_fullStr |
Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA |
title_full_unstemmed |
Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA |
title_sort |
expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern seward peninsula, alaska, usa |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1002/esp.2210 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fesp.2210 https://onlinelibrary.wiley.com/doi/pdf/10.1002/esp.2210 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/esp.2210 |
genre |
permafrost Seward Peninsula Thermokarst Alaska |
genre_facet |
permafrost Seward Peninsula Thermokarst Alaska |
op_source |
Earth Surface Processes and Landforms volume 36, issue 14, page 1889-1897 ISSN 0197-9337 1096-9837 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/esp.2210 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
36 |
container_issue |
14 |
container_start_page |
1889 |
op_container_end_page |
1897 |
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1802648971434262528 |