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. 2021 Jun 9;48(11):e2021GL093419. doi: 10.1029/2021GL093419

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© 2021. The Authors.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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(a) Comparison of Δ¹⁴C values between the California bristlecone pine, Switzerland larch, and Finland Scots pine series. (b) The same as Figure 1a, but the Switzerland and Finnish series are shifted as minus 1.9‰ and 3.1‰ in the vertical axis direction. (c) Combined Δ¹⁴C values (weighted averages) of the three series in Figure 1b.