Title
Contrasting response of European forest and grassland energy exchange to heatwaves Contrasting response of European forest and grassland energy exchange to heatwaves
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
London :Nature Publishing Group ,
Subject
Biology
Source (journal)
Nature geoscience. - London, 2008, currens
Volume/pages
3(2010) :10 , p. 722-727
ISSN
1752-0894
ISI
000282413900017
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/19f906/1646.pdf
https://repository.uantwerpen.be/docman/irua/b1d88c/1647.pdf
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