Abstract
Ongoing spring warming allows the growing season to begin earlier, enhancing carbon uptake in northern ecosystems1,2,3. Here we use 34 years of atmospheric CO2 concentration measurements at Barrow, Alaska (BRW, 71° N) to show that the interannual relationship between spring temperature and carbon uptake has recently shifted. We use two indicators: the spring zero-crossing date of atmospheric CO2 (SZC) and the magnitude of CO2 drawdown between May and June (SCC). The previously reported strong correlation between SZC, SCC and spring land temperature (ST) was found in the first 17 years of measurements, but disappeared in the last 17 years. As a result, the sensitivity of both SZC and SCC to warming decreased. Simulations with an atmospheric transport model4 coupled to a terrestrial ecosystem model5 suggest that the weakened interannual correlation of SZC and SCC with ST in the last 17 years is attributable to the declining temperature response of spring net primary productivity (NPP) rather than to changes in heterotrophic respiration or in atmospheric transport patterns. Reduced chilling during dormancy and emerging light limitation are possible mechanisms that may have contributed to the loss of NPP response to ST. Our results thus challenge the ‘warmer spring–bigger sink’ mechanism.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (41530528), the International Partnership Program of Chinese Academy of Sciences (Grant No. 131C11KYSB20160061), the BELSPO STEREO project ECOPROPHET (SR00334), the 111 Project (B14001), and National Youth Top-notch Talent Support Program in China. P.C., I.A.J. and J.P. acknowledge support from the European Research Council through Synergy grant ERC-2013-SyG-610028 ‘P-IMBALANCE’. Analysis of FLEXPART was conducted within the LATICE project at the University of Oslo. J.Mao and X.Shi are supported by the Biogeochemistry-Climate Feedbacks Scientific Focus Area project funded through the Regional and Global Climate Modeling Program in the Climate and Environmental Sciences Division (CESD) of the Biological and Environmental Research (BER) Program in the US Department of Energy Office of Science. Oak Ridge National Laboratory is managed by UT-BATTELLE for DOE under contract DE-AC05-00OR22725.
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S.Piao designed the research; Z.L., T.W. and P.P.T. performed measurements of CO2 data analysis; S.Peng, T.W. and Z.L. performed ORCHIDEE modelling and transport analysis; F.C., J.F.B. and A.S. performed footprint analysis; S.Piao drafted the paper; and all authors contributed to the interpretation of the results and to the text.
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Piao, S., Liu, Z., Wang, T. et al. Weakening temperature control on the interannual variations of spring carbon uptake across northern lands. Nature Clim Change 7, 359–363 (2017). https://doi.org/10.1038/nclimate3277
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DOI: https://doi.org/10.1038/nclimate3277
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