WilcoxKeimJongEtAl2019

Référence

Wilcox, E.J., Keim, D., de Jong, T., Walker, B., Sonnentag, O., Sniderhan, A.E., Mann, P., Marsh, P. (2019) Tundra shrub expansion may amplify permafrost thaw by advancing snowmelt timing. Arctic Science, 5(4):202-217. (Scopus )

Résumé

The overall spatial and temporal influence of shrub expansion on permafrost is largely unknown due to uncertainty in estimating the magnitude of many counteracting processes. For example, shrubs shade the ground during the snow-free season, which can reduce active layer thickness. At the same time, shrubs advance the timing of snowmelt when they protrude through the snow surface, thereby exposing the active layer to thawing earlier in spring. Here, we compare 3056 in situ frost table depth measurements split between mineral earth hummocks and organic inter-hummock zones across four dominant shrub–tundra vegetation types. Snow-free date, snow depth, hummock development, topography, and vegetation cover were compared to frost table depth measurements using a structural equation modeling approach that quantifies the direct and combined interacting influence of these variables. Areas of birch shrubs became snow free earlier regardless of snow depth or hillslope aspect because they protruded through the snow surface, leading to deeper hummock frost table depths. Projected increases in shrub height and extent combined with projected decreases in snowfall would lead to increased shrub protrusion across the Arctic, potentially deepening the active layer in areas where shrub protrusion advances the snow-free date. © 2019, Canadian Science Publishing. All rights reserved.

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@ARTICLE { WilcoxKeimJongEtAl2019,
    AUTHOR = { Wilcox, E.J. and Keim, D. and de Jong, T. and Walker, B. and Sonnentag, O. and Sniderhan, A.E. and Mann, P. and Marsh, P. },
    TITLE = { Tundra shrub expansion may amplify permafrost thaw by advancing snowmelt timing },
    JOURNAL = { Arctic Science },
    YEAR = { 2019 },
    VOLUME = { 5 },
    NUMBER = { 4 },
    PAGES = { 202-217 },
    NOTE = { cited By 1 },
    ABSTRACT = { The overall spatial and temporal influence of shrub expansion on permafrost is largely unknown due to uncertainty in estimating the magnitude of many counteracting processes. For example, shrubs shade the ground during the snow-free season, which can reduce active layer thickness. At the same time, shrubs advance the timing of snowmelt when they protrude through the snow surface, thereby exposing the active layer to thawing earlier in spring. Here, we compare 3056 in situ frost table depth measurements split between mineral earth hummocks and organic inter-hummock zones across four dominant shrub–tundra vegetation types. Snow-free date, snow depth, hummock development, topography, and vegetation cover were compared to frost table depth measurements using a structural equation modeling approach that quantifies the direct and combined interacting influence of these variables. Areas of birch shrubs became snow free earlier regardless of snow depth or hillslope aspect because they protruded through the snow surface, leading to deeper hummock frost table depths. Projected increases in shrub height and extent combined with projected decreases in snowfall would lead to increased shrub protrusion across the Arctic, potentially deepening the active layer in areas where shrub protrusion advances the snow-free date. © 2019, Canadian Science Publishing. All rights reserved. },
    AFFILIATION = { Cold Regions Research Centre, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada; Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada; School of Geography and Earth Science, McMaster University, Hamilton, ON L8S 4K1, Canada; Département de Géographie & Centre d’Études Nordiques, Université de Montréal, Montréal, QC H2V 2B8, Canada },
    AUTHOR_KEYWORDS = { Active layer; Frost table; Hummocks; Shrubs; Snowmelt },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1139/as-2018-0028 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076039539&doi=10.1139%2fas-2018-0028&partnerID=40&md5=412b3f8a93149e55f190b6c5e706c09a },
}

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