A global environmental crisis 42,000 years ago

doi:10.1126/science.abb8677

GSTDTAP > 气候变化

DOI	10.1126/science.abb8677
	A global environmental crisis 42,000 years ago
	Alan Cooper; Chris S. M. Turney; Jonathan Palmer; Alan Hogg; Matt McGlone; Janet Wilmshurst; Andrew M. Lorrey; Timothy J. Heaton; James M. Russell; Ken McCracken; Julien G. Anet; Eugene Rozanov; Marina Friedel; Ivo Suter; Thomas Peter; Raimund Muscheler; Florian Adolphi; Anthony Dosseto; J. Tyler Faith; Pavla Fenwick; Christopher J. Fogwill; Konrad Hughen; Mathew Lipson; Jiabo Liu; Norbert Nowaczyk; Eleanor Rainsley; Christopher Bronk Ramsey; Paolo Sebastianelli; Yassine Souilmi; Janelle Stevenson; Zoë Thomas; Raymond Tobler; Roland Zech
	2021-02-19
发表期刊	Science
出版年	2021
英文摘要	Do terrestrial geomagnetic field reversals have an effect on Earth's climate? Cooper et al. created a precisely dated radiocarbon record around the time of the Laschamps geomagnetic reversal about 41,000 years ago from the rings of New Zealand swamp kauri trees. This record reveals a substantial increase in the carbon-14 content of the atmosphere culminating during the period of weakening magnetic field strength preceding the polarity switch. The authors modeled the consequences of this event and concluded that the geomagnetic field minimum caused substantial changes in atmospheric ozone concentration that drove synchronous global climate and environmental shifts. Science , this issue p. [811][1] 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. [1]: /lookup/doi/10.1126/science.abb8677
领域	气候变化 ; 资源环境
URL	查看原文
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/315725
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Alan Cooper,Chris S. M. Turney,Jonathan Palmer,et al. A global environmental crisis 42,000 years ago[J]. Science,2021.
APA	Alan Cooper.,Chris S. M. Turney.,Jonathan Palmer.,Alan Hogg.,Matt McGlone.,...&Roland Zech.(2021).A global environmental crisis 42,000 years ago.Science.
MLA	Alan Cooper,et al."A global environmental crisis 42,000 years ago".Science (2021).