No Cover Image

Journal article 26 views

Geochemical ice-core constraints on the timing and climatic impact of Aniakchak II (1628 BCE) and Thera (Minoan) volcanic eruptions

Charlotte Pearson Orcid Logo, Michael Sigl Orcid Logo, Andrea Burke Orcid Logo, Siwan Davies Orcid Logo, Andrei Kurbatov, Mirko Severi Orcid Logo, Jihong Cole-Dai, Helen Innes Orcid Logo, Paul Albert Orcid Logo, Meredith Helmick

PNAS Nexus, Volume: 1, Issue: 2

Swansea University Authors: Siwan Davies Orcid Logo, Paul Albert Orcid Logo

  • 59960.pdf

    PDF | Version of Record

    Copyright: The Author(s) 2022. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs licence

    Download (1.65MB)

Abstract

Decades of research have focused on establishing the exact year and climatic impact of the Minoan eruption of Thera, Greece (c.1680 to 1500 BCE). Ice cores offer key evidence to resolve this controversy, but attempts have been hampered by a lack of multivolcanic event synchronization between records...

Full description

Published in: PNAS Nexus
ISSN: 2752-6542
Published: Oxford University Press (OUP) 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa59960
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: Decades of research have focused on establishing the exact year and climatic impact of the Minoan eruption of Thera, Greece (c.1680 to 1500 BCE). Ice cores offer key evidence to resolve this controversy, but attempts have been hampered by a lack of multivolcanic event synchronization between records. In this study, Antarctic and Greenland ice-core records are synchronized using a double bipolar sulfate marker, and calendar dates are assigned to each eruption revealed within the ‘Thera period’. From this global-scale sequence of volcanic sulfate loading, we derive indications toward each eruption’s latitude and potential to disrupt the climate system. Ultrafine sampling for sulfur isotopes and tephra conclusively demonstrate a colossal eruption of Alaska’s Aniakchak II as the source of stratospheric sulfate in the now precisely dated 1628 BCE ice layer. These findings end decades of speculation that Thera was responsible for the 1628 BCE event, and place Aniakchak II (52 ± 17 Tg S) and an unknown volcano at 1654 BCE (50 ± 13 Tg S) as two of the largest Northern Hemisphere sulfur injections in the last 4,000 years. This opens possibilities to explore widespread climatic impacts for contemporary societies and, in pinpointing Aniakchak II, confirms that stratospheric sulfate can be globally distributed from eruptions outside the tropics. Dating options for Thera are reduced to a series of precisely dated, constrained stratospheric sulfur injection events at 1611 BCE, 1561/1558/1555BCE, and c.1538 BCE, which are all below 14 ± 5 Tg S, indicating a climatic forcing potential for Thera well below that of Tambora (1815 CE).
Keywords: ice cores, tephra, sulfate, volcanic forcing, tree-rings
College: College of Science
Funders: This work was supported by funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement 820047 to M.Si.), the Malcolm H. Wiener Foundation (Interdisciplinary Chronology of Civilizations Project to C.P.), and a UKRI Future Leader Fellowship (MR/S035478/1 to P.A).
Issue: 2