Detecting the critical periods that underpin interannual fluctuations in the carbon balance of European forests

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

  • Author: le Maire, Guerric

    CEA CNRS UVSQ (FR), Laboratoire des Sciences de Climat et de l’Environnement

  • Author: Delpierre, Nicolas

    Laboratoire Ecologie, Systématique et Evolution, UMR 8079, Université Paris-Sud (FR)

  • Author: Jung, Martin

    Max-Planck-Institute for Biogeochemistry (DE)

  • Author: Ciais, Philippe

    Laboratoire des Sciences de Climat et de l’Environnement, CEA CNRS UVSQ (FR)

  • Author: Reichstein, Markus

    Max-Planck-Institute for Biogeochemistry (DE)

  • Author: Viovy, Nicolas

    Laboratoire des Sciences de Climat et de l’Environnement, CEA CNRS UVSQ (FR)

  • Author: Granier, André

    UMR INRA-UHP Écologie et Écophysiologie Forestières, INRA Centre de Nancy (FR)

  • Author: Ibrom, Andreas

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

  • Author: Kolari, Pasi

    Department of Physics, University of Helsinki (FI)

  • Author: Longdoz, Bernard

    UMR INRA-UHP Écologie et Écophysiologie Forestières, INRA Centre de Nancy (FR)

  • Author: Moors, Eddy J.

    Earth System Science - Climate Change, Alterra Wageningen UR (NL)

  • Author: Pilegaard, Kim

    Biosystems Division. Management, Biosystems Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Denmark

  • Author: Rambal, Serge

    UMR 5175, DREAM, CEFE, CNRS (FR)

  • Author: Richardson, Andrew D.

    Department of Organismic and Evolutionary Biology, Harvard University Herbaria, Harvard University (US)

  • Author: Vesala, Timo

    Department of Physics, University of Helsinki (FI)

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The interannual variability of CO2 exchange by forest ecosystems in Europe was analyzed at site and regional scales by identifying critical periods that contributed to interannual flux anomalies. Critical periods were defined as periods in which monthly and annual flux anomalies were correlated. The analysis was first conducted at seven European forest flux tower sites with contrasting species and climatic conditions. Organizing Carbon and Hydrology in Dynamic Ecosystems (ORCHIDEE), a generic process-based model, represented fairly well most features of the critical period patterns and their climate drivers at the site scale. Simulations at the scale of European forests were performed with ORCHIDEE integrated at a 0.25° spatial resolution. The spatial and temporal distributions of critical periods for canopy photosynthesis, ecosystem respiration, and net ecosystem exchange (NEE) as well as their underlying climate drivers were analyzed. The interannual variability in gross primary productivity (GPP) was explained by critical periods during spring and summer months. In contrast, the interannual variability in total ecosystem respiration (TER) was explained by critical periods occurring throughout the year. A latitudinal contrast between southern and northern Europe was observed in the distributions of critical periods for GPP and TER. The critical periods were positively controlled by temperature in northern Europe and by soil water availability in southern Europe. More importantly, the latitudinal transition between temperature-driven and water-driven critical periods for GPP varied from early spring to late summer. Such a distinct seasonal regime of critical periods was less clearly defined for TER and NEE. Overall, the critical periods associated with NEE variations and their meteorological drivers followed those associated with GPP.
Original languageEnglish
JournalJournal of Geophysical Research G - Biogeosciences
Publication date2010
Volume115
PagesG00H03
ISSN0148-0227
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 6

Keywords

  • Bio systems, Environment and climate
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