Abstract
High-resolution proxies of past climate are essential for a better understanding of the climate system1. Tree rings are routinely used to reconstruct Holocene climate variations at high temporal resolution2, but only rarely have they offered insight into climate variability during earlier periods3. Fitzroya cupressoides—a South American conifer which attains ages up to 3,600 years—has been shown to record summer temperatures in northern Patagonia during the past few millennia4. Here we report a floating 1,229-year chronology developed from subfossil stumps of F. cupressoides in southern Chile that dates back to approximately 50,000 14C years before present. We use this chronology to calculate the spectral characteristics of climate variability in this time, which was probably an interstadial (relatively warm) period. Growth oscillations at periods of 150–250, 87–94, 45.5, 24.1, 17.8, 9.3 and 2.7–5.3 years are identified in the annual subfossil record. A comparison with the power spectra of chronologies derived from living F. cupressoides trees shows strong similarities with the 50,000-year-old chronology, indicating that similar growth forcing factors operated in this glacial interstadial phase as in the current interglacial conditions.
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Acknowledgements
We thank J. Betancourt, D. Stahle, V. Markgraf and J. Pilcher for comments on the manuscript. AMS dates were provided in part through funding by NSF (Earth System History) and the Inter-American Institute (IAI).
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Roig, F., Le-Quesne, C., Boninsegna, J. et al. Climate variability 50,000 years ago in mid-latitude Chile as reconstructed from tree rings. Nature 410, 567–570 (2001). https://doi.org/10.1038/35069040
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DOI: https://doi.org/10.1038/35069040
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