气候变化领域集成服务门户(CCPortal): Causes and Climatic Consequences of the Impact Winter at the Cretaceous-Paleogene Boundary

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DOI	10.1029/2019GL085572
	Causes and Climatic Consequences of the Impact Winter at the Cretaceous-Paleogene Boundary
	Tabor C.R.; Bardeen C.G.; Otto-Bliesner B.L.; Garcia R.R.; Toon O.B.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:3
英文摘要	Prolonged periods of low light and cold temperatures at Earth's surface are hypothesized effects of the end-Cretaceous asteroid impact. However, debate remains about the causes and consequences of this “impact winter.” We perform simulations of the Chicxulub impact with an Earth system model that can simulate the evolution of extreme aerosol loading to quantify the climatic responses to emissions (soot, sulfur, and dust) associated with the impact winter. We show that all impact winter emissions can drastically reduce surface temperature and precipitation. However, only soot emission from impact-driven firestorms is capable of reducing light to below the photosynthetic threshold for many months. Therefore, our results suggest that widespread fires may have been necessary to produce the observed pattern of marine extinction across the Cretaceous-Paleogene boundary. We identify polar coasts and the surrounding open oceans as regions likely to have experienced the least climatic, and biotic, disruption from the impact winter. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Aerosols; Asteroids; Light extinction; Asteroid impact; Climatic response; Cold temperatures; Cretaceous; Cretaceous-Paleogene boundary; Earth system model; Paleoclimates; Surface temperatures; Soot; aerosol; asteroid; climate modeling; Cretaceous-Paleogene boundary; extinction; open ocean; paleoclimate; precipitation (climatology); surface temperature; winter
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170789
作者单位	Department of Geosciences, University of Connecticut, Storrs, CT, United States; Atmospheric Chemistry, Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, United States
推荐引用方式 GB/T 7714	Tabor C.R.,Bardeen C.G.,Otto-Bliesner B.L.,et al. Causes and Climatic Consequences of the Impact Winter at the Cretaceous-Paleogene Boundary[J],2020,47(3).
APA	Tabor C.R.,Bardeen C.G.,Otto-Bliesner B.L.,Garcia R.R.,&Toon O.B..(2020).Causes and Climatic Consequences of the Impact Winter at the Cretaceous-Paleogene Boundary.Geophysical Research Letters,47(3).
MLA	Tabor C.R.,et al."Causes and Climatic Consequences of the Impact Winter at the Cretaceous-Paleogene Boundary".Geophysical Research Letters 47.3(2020).