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Exploration of Thermal Bridging through Shrub Branches 1 in Alpine Snow

Geophysical research letters, 2023, Vol.50 [Peer Reviewed Journal]

Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 0094-8276 ;EISSN: 1944-8007 ;DOI: 10.1029/2023GL105100

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  • Title:
    Exploration of Thermal Bridging through Shrub Branches 1 in Alpine Snow
  • Author: Domine, Florent ; Fourteau, Kévin ; Choler, P.
  • Subjects: Environmental Sciences
  • Is Part Of: Geophysical research letters, 2023, Vol.50
  • Description: In the high Arctic, thermal bridging through frozen shrub branches has been demonstrated to cool the ground by up to 4°C during cold spells, affecting snow metamorphism and soil carbon and nutrients. In alpine conditions, the thermal conductivity contrast between shrub branches and snow is much less than in the Arctic, so that the importance of thermal bridging is uncertain. We explore this effect by monitoring ground temperature and liquid water content under green alders and under nearby alpine tundra in the Alps. During a January 2022 cold spell, the ground temperature at 5 cm depth under alders is 1.3°C colder than under alpine tundra. Ground water freezing under alders is complete, while water remains liquid under tundra. Finite element simulations reproduce the observed temperature difference between both sites, showing that thermal bridging does affect ground temperature also under Alpine conditions.
  • Publisher: American Geophysical Union
  • Language: English
  • Identifier: ISSN: 0094-8276
    EISSN: 1944-8007
    DOI: 10.1029/2023GL105100
  • Source: Hyper Article en Ligne (HAL) (Open Access)
    Wiley Blackwell AGU Digital Library
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