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Date
2021-02-19Type
- Journal Article
Citations
Cited 30 times in
Web of Science
Cited 34 times in
Scopus
ETH Bibliography
yes
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Abstract
Geological archives record multiple reversals of Earth’s magnetic poles, but the global impacts of these events, if any, remain unclear. Uncertain radiocarbon calibration has limited investigation of the potential effects of the last major magnetic inversion, known as the Laschamps Excursion [41 to 42 thousand years ago (ka)]. We use ancient New Zealand kauri trees (Agathis australis) to develop a detailed record of atmospheric radiocarbon levels across the Laschamps Excursion. We precisely characterize the geomagnetic reversal and perform global chemistry-climate modeling and detailed radiocarbon dating of paleoenvironmental records to investigate impacts. We find that geomagnetic field minima ~42 ka, in combination with Grand Solar Minima, caused substantial changes in atmospheric ozone concentration and circulation, driving synchronous global climate shifts that caused major environmental changes, extinction events, and transformations in the archaeological record. © 2021 American Association for the Advancement of Science Show more
Publication status
publishedExternal links
Journal / series
ScienceVolume
Pages / Article No.
Publisher
AAASOrganisational unit
03517 - Peter, Thomas / Peter, Thomas
Funding
180043 - The Overlooked Role of Stratospheric Ozone in forcing Northern Hemispheric climate (TORSO) (SNF)
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Citations
Cited 30 times in
Web of Science
Cited 34 times in
Scopus
ETH Bibliography
yes
Altmetrics