Contrasting response of European forest and grassland energy exchange to heatwaves

Publication: Research - peer-reviewJournal article – Annual report year: 2010

  • Author: Teuling, A.J.

    Swiss Federal Institute of Technology Zurich

  • Author: Seneviratne, S.I.

    Swiss Federal Institute of Technology Zurich

  • Author: Stöckli, R.

    Climate Science, Climate Analysis, MeteoSwiss (CH)

  • Author: Reichstein, M.

    Max Planck Institute

  • Author: Moors, E.

    Alterra (NL)

  • Author: Ciais, P.

    Laboratoire des Sciences du Climat et de l’Environnement (FR)

  • Author: Luyssaert, S.

    Laboratoire des Sciences du Climat et de l’Environnement (FR)

  • Author: Van Den Hurk, B.

    KNMI (NL)

  • Author: Ammann, C.

    Agroscope

  • Author: Bernhofer, C.

    Technische Universität Dresden

  • Author: Dellwik, Ebba

    Meteorology, Wind Energy Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark

  • Author: Gianelle, D.

    IASMA Research and Innovation Centre (IT)

  • Author: Gielen, B.

    University of Antwerp

  • Author: Grünwald, T.

    Technische Universität Dresden

  • Author: Klumpp, K.

    National Institute for Agronomic Research

  • Author: Montagnani, L.

    Forest Services and Agency for the Environment (IT)

  • Author: Moureaux, C.

    University of Liège

  • Author: Sottocomola, C.

    IASMA Research and Innovation Centre (IT)

  • Author: Wohlfahrt, M.

    University of Innsbruck

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Recent European heatwaves have raised interest in the impact of land cover conditions on temperature extremes. At present, it is believed that such extremes are enhanced by stronger surface heating of the atmosphere, when soil moisture content is below average. However, the impact of land cover on the exchange of water and energy and the interaction of this exchange with the soil water balance during heatwaves is largely unknown. Here we analyse observations from an extensive network of flux towers in Europe that reveal a difference between the temporal responses of forest and grassland ecosystems during heatwaves. We find that initially, surface heating is twice as high over forest than over grassland. Over grass, heating is suppressed by increased evaporation in response to increased solar radiation and temperature. Ultimately, however, this process accelerates soil moisture depletion and induces a critical shift in the regional climate system that leads to increased heating. We propose that this mechanism may explain the extreme temperatures in August 2003. We conclude that the conservative water use of forest contributes to increased temperatures in the short term, but mitigates the impact of the most extreme heat and/or long-lasting events.
Original languageEnglish
JournalNature Geoscience
Publication date2010
Volume30
Issue10
Pages722-727
ISSN1752-0894
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 88

Keywords

  • Wind power meteorology, Vindenergi, Wind Energy
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