Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada
Identifieur interne : 001770 ( Main/Curation ); précédent : 001769; suivant : 001771Vegetation Canopy and Radiation Controls on Permafrost Plateau Evolution within the Discontinuous Permafrost Zone, Northwest Territories, Canada
Auteurs : L. Chasmer [Canada] ; W. Quinton [Canada] ; C. Hopkinson [Canada] ; R. Petrone [Canada] ; P. Whittington [Canada]Source :
- Permafrost and Periglacial Processes [ 1045-6740 ] ; 2011-07.
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.
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DOI: 10.1002/ppp.724
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Process.</title><idno type="ISSN">1045-6740</idno><idno type="eISSN">1099-1530</idno><imprint><publisher>John Wiley & Sons, Ltd</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2011-07">2011-07</date><biblScope unit="volume">22</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="199">199</biblScope><biblScope unit="page" to="213">213</biblScope></imprint><idno type="ISSN">1045-6740</idno></series><idno type="istex">C8A4C07B2E6BC0CD03E487BA537CA9A46E6ABF28</idno><idno type="DOI">10.1002/ppp.724</idno><idno type="ArticleID">PPP724</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1045-6740</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="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.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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