气候变化领域集成服务门户(CCPortal): Supernova triggers for end:Devonian extinctions

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DOI	10.1073/pnas.2013774117
	Supernova triggers for end:Devonian extinctions
	Fields B.D.; Melott A.L.; Ellis J.; Ertel A.F.; Fry B.J.; Lieberman B.S.; Liu Z.; Miller J.A.; Thomas B.C.
发表日期	2020
ISSN	0027-8424
起始页码	21008
结束页码	21010
卷号	117 期号:35
英文摘要	The Late Devonian was a protracted period of low speciation resulting in biodiversity decline, culminating in extinction events near the Devonian–Carboniferous boundary. Recent evidence indicates that the final extinction event may have coincided with a dramatic drop in stratospheric ozone, possibly due to a global temperature rise. Here we study an alternative possible cause for the postulated ozone drop: a nearby supernova explosion that could inflict damage by accelerating cosmic rays that can deliver ionizing radiation for up to ∼ 100 ky. We therefore propose that the end-Devonian extinctions were triggered by supernova explosions at ∼ 20 pc, somewhat beyond the “kill distance” that would have precipitated a full mass extinction. Such nearby supernovae are likely due to core collapses of massive stars; these are concentrated in the thin Galactic disk where the Sun resides. Detecting either of the long-lived radioisotopes 146Sm or 244Pu in one or more end-Devonian extinction strata would confirm a supernova origin, point to the core-collapse explosion of a massive star, and probe supernova nucleosynthesis. Other possible tests of the supernova hypothesis are discussed. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Extinction \| Supernova \| Cosmic rays \| Ozone \| Isotope geology
语种	英语
scopus关键词	ozone; plutonium 244; radioisotope; samarium 146; unclassified drug; Article; astronomy; biosphere damage; cosmic radiation; cosmological phenomena; environmental impact; greenhouse effect; heating; ionizing radiation; Late Devonian mass extinction; ozone depletion; priority journal; supernova; supernova nucleosynthesis; adverse event; biodiversity; chemistry; fossil; history; space; species extinction; Biodiversity; Cosmic Radiation; Extinction, Biological; Extraterrestrial Environment; Fossils; History, Ancient; Stars, Celestial
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160832
作者单位	Fields, B.D., aIllinois Center for Advanced Studies of the Universe, University of Illinois, Urbana, IL 61801, United States, Department of Astronomy, University of Illinois, Urbana, IL 61801, United States, Department of Physics, University of Illinois, Urbana, IL 61801, United States; Melott, A.L., Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, United States; Ellis, J., Department of Physics, Kings College London, London, WC2R 2LS, United Kingdom, Theoretical Physics Department, European Organization for NuclearResearch (CERN), Geneva 23, CH-1211, Switzerland, Laboratory of High Energy and Computational Physics, National Institute of Chemical Physics, Biophysics, Tallinn, 10143, Estonia; Ertel, A.F., Department of Astronomy, University of Illinois, Urbana, IL 61801, United States; Fry, B.J., Department of Physics, United States Air Force Academy, Colorado Springs, CO 80840, United States; Lieberman, B.S., Department of Ecology &Evolutionary Biology, University of Ka...
推荐引用方式 GB/T 7714	Fields B.D.,Melott A.L.,Ellis J.,et al. Supernova triggers for end:Devonian extinctions[J],2020,117(35).
APA	Fields B.D..,Melott A.L..,Ellis J..,Ertel A.F..,Fry B.J..,...&Thomas B.C..(2020).Supernova triggers for end:Devonian extinctions.Proceedings of the National Academy of Sciences of the United States of America,117(35).
MLA	Fields B.D.,et al."Supernova triggers for end:Devonian extinctions".Proceedings of the National Academy of Sciences of the United States of America 117.35(2020).