Frost rings in 1627 BC and AD 536 in subfossil pinewood from Finnish Lapland

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Helama , S , Saranpää , P , Pearson , C , Arppe , L , Holopainen , J , Mäkinen , H , Mielikäinen , K , Nöjd , P , Sutinen , R , Taavitsainen , J-P , Timonen , M , Uusitalo , J & Oinonen , M 2019 , ' Frost rings in 1627 BC and AD 536 in subfossil pinewood from Finnish Lapland ' , Quaternary Science Reviews , vol. 204 , pp. 208-215 . https://doi.org/10.1016/j.quascirev.2018.11.031

Title: Frost rings in 1627 BC and AD 536 in subfossil pinewood from Finnish Lapland
Author: Helama, Samuli; Saranpää, Pekka; Pearson, Charlotte; Arppe, Laura; Holopainen, Jari; Mäkinen, Harri; Mielikäinen, Kari; Nöjd, Pekka; Sutinen, Raimo; Taavitsainen, Jussi-Pekka; Timonen, Mauri; Uusitalo, Joonas; Oinonen, Markku
Contributor: University of Helsinki, Natural Resources Institute Finland (LUKE)
University of Helsinki, Natural Sciences Unit
University of Helsinki, Natural Sciences Unit
University of Helsinki, Natural Sciences Unit
Date: 2019-01-15
Language: eng
Number of pages: 8
Belongs to series: Quaternary Science Reviews
ISSN: 0277-3791
URI: http://hdl.handle.net/10138/324637
Abstract: Frost rings can provide direct evidence of anomalously cold summertime conditions on hemispheric scales. Here we report frost rings in subfossil pinewood from Finnish Lapland dated dendrochronologically to AD 536 and 1627 BC. These exact calendar dates have been vividly discussed in the literature in the respective contexts of a cold climate anomaly/dust veil/crop failure/famine/Justinianic Plague and the Minoan eruption of Thera (Santorini). Coinciding anomalies in growth and carbon isotope ratios (delta C-13) indicate cold and overcast conditions in these years in Finnish Lapland, typical to conditions induced by volcanic dust veils. This evidence reinforces the view of multiple climatic drivers strongly effecting contemporary societies around AD 536 and provides important new evidence regarding the 1627 BC event. We report a frost ring for this year, and also consider evidence from Lapland for other Thera candidate eruptions in the 16th century BC. The marker years 1560 BC and 1546 BC in bristlecone pine tree rings in North America are positioned within negative departures in our delta C-13 data. Most likely, the frosts occurred somewhere in July and were driven by dust veils from Northern Hemisphere. Although not indicative of volcanic provenance, frost rings and other dendroclimatic proxies dated to exact calendar years offer important time markers for chronological frameworks which can synchronize archaeological, historical and environmental data to further our understanding of environmental changes at scales that matter to human societies. (C) 2018 Elsevier Ltd. All rights reserved.
Subject: 1181 Ecology, evolutionary biology
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