A global environmental crisis 42,000 years ago


Contact
florian.adolphi [ at ] awi.de

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.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Helmholtz Cross Cutting Activity (2021-2027)
N/A
Publication Status
Published
Eprint ID
55798
DOI 10.1126/science.abb8677

Cite as
Cooper, A. , Turney, C. S. , Palmer, J. , Hogg, A. , McGlone, M. , Wilmshurst, J. , Lorrey, A. M. , Heaton, T. J. , Russell, J. M. , McCracken, K. , Anet, J. G. , Rozanov, E. , Friedel, M. , Suter, I. , Peter, T. , Muscheler, R. , Adolphi, F. , Dosseto, A. , Tyler Faith, J. , Fenwick, P. , Fogwill, C. J. , Hughen, K. , Lipson, M. , Liu, J. , Nowaczyk, N. , Rainsley, E. , Ramsey, C. B. , Sebastianelli, P. , Souilmi, Y. , Stevenson, J. , Thomas, Z. , Tobler, R. and Zech, R. (2021): A global environmental crisis 42,000 years ago , Science, 371 (6531), pp. 811-818 . doi: 10.1126/science.abb8677


Share


Citation

Research Platforms
N/A

Campaigns
N/A


Actions
Edit Item Edit Item