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. 2016 Mar 4;6:22532. doi: 10.1038/srep22532

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Charcoal-based proxy of fire activity⁴¹ and chironomid-based temperature reconstruction³⁷ represented conditions over northern Sweden. Sea-surface conditions are illustrated from SST reconstruction on the Vøring Plateau, Norwegian Sea core MD952011 ⁴⁹, IRD occurrences in the northwest (core KN158-4GGC22) and northeast (core VM29-191) North Atlantic⁵⁰, and sea ice cover estimates from the Labrador Sea core HU84-030-021⁵¹,⁵². See Table SI 1 for exact site locations. Charcoal reconstruction is an average of three lake sediment chronologies and chironomid reconstruction is an average of two reconstructions. Thick horizontal lines represent periods of similar mean conditions identified through regime shift detection method based on sequential t-tests⁵⁸. 95% confidence envelop is shown for fire chronology. Yellow bars indicate periods with increased fire activity.