Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada
ABSTRACT This study examines the links between the spatial distribution of three‐dimensional vegetation structural characteristics and historical permafrost plateau area changes using airborne light detection and ranging and aerial photography. The results show that vegetation is prone to reduced ca...
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crwiley:10.1002/ppp.724 2024-09-15T18:26:38+00:00 Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada Chasmer, L. Quinton, W. Hopkinson, C. Petrone, R. Whittington, P. 2011 http://dx.doi.org/10.1002/ppp.724 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.724 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.724 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 22, issue 3, page 199-213 ISSN 1045-6740 1099-1530 journal-article 2011 crwiley https://doi.org/10.1002/ppp.724 2024-08-27T04:27:25Z ABSTRACT This study examines the links between the spatial distribution of three‐dimensional vegetation structural characteristics and historical permafrost plateau area changes using airborne light detection and ranging and aerial photography. The results show that vegetation is prone to reduced canopy fractional cover (by up to 50%) and reduced canopy heights (by 16−30%) at the edges of plateaus. Reduced biomass may cause a positive feedback, whereby diminished within‐ and below‐canopy shadowing (by 1 h of shadow time per day) results in increased radiation incident on the ground surface (16% greater at open‐ vs closed‐canopy plateau sites) and increased longwave radiation losses (74% greater at open‐ vs closed‐canopy plateau sites). Increased incident shortwave radiation may result in augmented thawing of permafrost and increased meltwater runoff, which further inhibits vegetation and permafrost persistence. Edge influences on ground thaw cause vegetation to die over several years (confirmed using historical aerial photography), thereby exacerbating thaw and plateau area reduction (plateau area reduction = ~27% over 60 years). Permafrost degradation is also evidenced by the increasingly fragmented characteristics of the landscape. Copyright © 2011 John Wiley & Sons, Ltd. Article in Journal/Newspaper Northwest Territories permafrost Permafrost and Periglacial Processes Wiley Online Library Permafrost and Periglacial Processes n/a n/a |
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crwiley |
language |
English |
description |
ABSTRACT This study examines the links between the spatial distribution of three‐dimensional vegetation structural characteristics and historical permafrost plateau area changes using airborne light detection and ranging and aerial photography. The results show that vegetation is prone to reduced canopy fractional cover (by up to 50%) and reduced canopy heights (by 16−30%) at the edges of plateaus. Reduced biomass may cause a positive feedback, whereby diminished within‐ and below‐canopy shadowing (by 1 h of shadow time per day) results in increased radiation incident on the ground surface (16% greater at open‐ vs closed‐canopy plateau sites) and increased longwave radiation losses (74% greater at open‐ vs closed‐canopy plateau sites). Increased incident shortwave radiation may result in augmented thawing of permafrost and increased meltwater runoff, which further inhibits vegetation and permafrost persistence. Edge influences on ground thaw cause vegetation to die over several years (confirmed using historical aerial photography), thereby exacerbating thaw and plateau area reduction (plateau area reduction = ~27% over 60 years). Permafrost degradation is also evidenced by the increasingly fragmented characteristics of the landscape. Copyright © 2011 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
Chasmer, L. Quinton, W. Hopkinson, C. Petrone, R. Whittington, P. |
spellingShingle |
Chasmer, L. Quinton, W. Hopkinson, C. Petrone, R. Whittington, P. Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada |
author_facet |
Chasmer, L. Quinton, W. Hopkinson, C. Petrone, R. Whittington, P. |
author_sort |
Chasmer, L. |
title |
Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada |
title_short |
Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada |
title_full |
Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada |
title_fullStr |
Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada |
title_full_unstemmed |
Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada |
title_sort |
vegetation canopy and radiation controls on permafrost plateau evolution within the discontinuous permafrost zone, northwest territories, canada |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1002/ppp.724 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.724 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.724 |
genre |
Northwest Territories permafrost Permafrost and Periglacial Processes |
genre_facet |
Northwest Territories permafrost Permafrost and Periglacial Processes |
op_source |
Permafrost and Periglacial Processes volume 22, issue 3, page 199-213 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.724 |
container_title |
Permafrost and Periglacial Processes |
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1810467144925708288 |