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

Nature Communications
Ana BastosSteven W Running

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.

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Citations

Sep 8, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Damien BeillouinDavid Makowski
Sep 13, 2020·Scientific Reports·Armand HernándezSantiago Giralt
Sep 8, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Wouter PetersAlex Vermeulen
Mar 18, 2020·Nature Communications·Peer NowackJoanna D Haigh

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Methods Mentioned

BETA
PCA

Software Mentioned

Jena DGVM
MACCII
Jena
VEGAS
JSBACH
DGVMs
TransCom
FastTrack
Jena s81
GIMMS

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