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, Steven W. Running

Research output: Contribution to journalArticlepeer-review


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.

Original languageAmerican English
Article number10315
Number of pages9
JournalNature Communications
StatePublished - Jan 18 2016


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