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Tree-ring stable isotopes for regional discharge reconstruction in eastern Labrador and teleconnection with the Arctic Oscillation

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Abstract

In northeastern Canada (Labrador), instrumental climatic data cover less than 70 years and long reconstructions from natural archives are non-existent. This study specifically aims at helping filling this gap of knowledge by testing the possibility of reconstructing the regional 1800–2009 discharge of the lower Churchill River from black spruce tree-ring δ13C and δ18O series. The results illustrate direct relationships of summer climatic variables/derived parameter (maximum temperature, total precipitation and vapor pressure deficit) with tree-ring isotope values. Importantly, they show an inverse correlation between combined tree-ring isotope series and regional river discharge due to common climate forcing. To a lesser extent, transpiration also affects the river discharge and tree-ring isotopic compositions. The reconstructed river discharge series agrees with an independent reconstruction based on the ANATEM method (1880–2009 period). The agreement between the two reconstructions validates the two approaches for reconstructing regional hydroclimatic conditions at high latitudes. Moreover, the reconstructions suggest that summer discharge has decreased over the past 200 years in eastern Labrador and more broadly at the Québec-Labrador peninsula scale. This trend correlates with the long-term summer Arctic Oscillation (AO) that influences summer regional climatic conditions. This research contributes with other studies to build up observations linking summer AO and eastern Canada climatic conditions, and calls for research on mechanisms explaining these relationships during summer.

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Acknowledgements

The authors would like to thank Anna Smirnoff for technical support in the Delta-Lab at the Geological Survey of Canada, Québec city, and Pierre Masselot (INRS-ETE) for his help when converting Matlab code to R code for the δ13C PIN correction. This research was financially supported by the Climate Change Geoscience program (EXTREME events project) of Natural Resources Canada (Geological Survey of Canada), NSERC and the OURANOS consortium through a Collaborative Research and Development Grant (ARCHIVES project). Support for the twentieth Century Reanalysis Project version 2c dataset was provided by the US Department of Energy, Office of Science Biological and Environmental Research (BER), and by the National Oceanic and Atmospheric Administration Climate Program Office. The production of this manuscript benefitted from a constructive pre-submission review by Pierre Francus. GSC contribution number: 20180208.

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Correspondence to Lauriane Dinis.

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Dinis, L., Bégin, C., Savard, M.M. et al. Tree-ring stable isotopes for regional discharge reconstruction in eastern Labrador and teleconnection with the Arctic Oscillation. Clim Dyn 53, 3625–3640 (2019). https://doi.org/10.1007/s00382-019-04731-2

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  • DOI: https://doi.org/10.1007/s00382-019-04731-2

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