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. 2017 Jun 28;1(4):211–219. doi: 10.1002/2017GH000064

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©2017. The Authors.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Example of annual layer counting using ultra‐high resolution LA‐ICP‐MS. Annual layers were identified as local maxima in the Ca profile corresponding to snow deposited during high summer season. Relative uncertainty in annual layer counting within the time period represented in this figure is around 1–2 years. Smoothing in this figure (black line) is displayed only as a visual aid.