European land CO2 sink influenced by NAO and East-Atlantic Pattern coupling

Ana Bastos (), Ivan A. Janssens, Célia M. Gouveia, Ricardo M. Trigo, Philippe Ciais, Frédéric Chevallier, Josep Peñuelas, Christian Rödenbeck, Shilong Piao, Pierre Friedlingstein and Steven W. Running
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Ana Bastos: Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay
Ivan A. Janssens: University of Antwerp
Célia M. Gouveia: Instituto Dom Luiz, IDL, Faculdade de Ciências, Universidade de Lisboa
Ricardo M. Trigo: Instituto Dom Luiz, IDL, Faculdade de Ciências, Universidade de Lisboa
Philippe Ciais: Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay
Frédéric Chevallier: Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay
Josep Peñuelas: CREAF, Cerdanyola del Vallès
Christian Rödenbeck: Max Planck Institute for Biogeochemistry
Shilong Piao: College of Urban and Environmental Sciences
Pierre Friedlingstein: College of Engineering, Mathematics and Physical Sciences, University of Exeter
Steven W. Running: Numerical Terradynamic Simulation Group, University of Montana

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Large-scale climate patterns control variability in the global carbon sink. In Europe, the North-Atlantic Oscillation (NAO) influences vegetation activity, however the East-Atlantic (EA) pattern is known to modulate NAO strength and location. Using observation-driven and modelled data sets, we show that multi-annual variability patterns of European Net Biome Productivity (NBP) are linked to anomalies in heat and water transport controlled by the NAO–EA interplay. Enhanced NBP occurs when NAO and EA are both in negative phase, associated with cool summers with wet soils which enhance photosynthesis. During anti-phase periods, NBP is reduced through distinct impacts of climate anomalies in photosynthesis and respiration. The predominance of anti-phase years in the early 2000s may explain the European-wide reduction of carbon uptake during this period, reported in previous studies. Results show that improving the capability of simulating atmospheric circulation patterns may better constrain regional carbon sink variability in coupled carbon-climate models.

Date: 2016
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DOI: 10.1038/ncomms10315

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