globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1708980114
论文题名:
On transient climate change at the Cretaceous−Paleogene boundary due to atmospheric soot injections
作者: Bardeen C.G.; Garcia R.R.; Toon O.B.; Conley A.J.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2017
卷: 114, 期:36
起始页码: E7415
结束页码: E7424
语种: 英语
英文关键词: Asteroid impact ; Chicxulub ; Cretaceous ; Extinction ; Soot
Scopus关键词: hydrogen ; radical ; water ; aerosol ; Article ; atmosphere ; climate change ; Cretaceous ; environmental temperature ; freezing ; high temperature ; latitude ; light absorption ; ozone layer ; Paleogene ; photosynthesis ; priority journal ; sea ; simulation ; soot ; stratosphere ; sunlight ; ultraviolet radiation ; wet deposition ; Yucatan
英文摘要: Climate simulations that consider injection into the atmosphere of 15,000 Tg of soot, the amount estimated to be present at the Cretaceous−Paleogene boundary, produce what might have been one of the largest episodes of transient climate change in Earth history. The observed soot is believed to originate from global wildfires ignited after the impact of a 10-km-diameter asteroid on the Yucatán Peninsula 66 million y ago. Following injection into the atmosphere, the soot is heated by sunlight and lofted to great heights, resulting in a worldwide soot aerosol layer that lasts several years. As a result, little or no sunlight reaches the surface for over a year, such that photosynthesis is impossible and continents and oceans cool by as much as 28 °C and 11 °C, respectively. The absorption of light by the soot heats the upper atmosphere by hundreds of degrees. These high temperatures, together with a massive injection of water, which is a source of odd-hydrogen radicals, destroy the stratospheric ozone layer, such that Earth’s surface receives high doses of UV radiation for about a year once the soot clears, five years after the impact. Temperatures remain above freezing in the oceans, coastal areas, and parts of the Tropics, but photosynthesis is severely inhibited for the first 1 y to 2 y, and freezing temperatures persist at middle latitudes for 3 y to 4 y. Refugia from these effects would have been very limited. The transient climate perturbation ends abruptly as the stratosphere cools and becomes supersaturated, causing rapid dehydration that removes all remaining soot via wet deposition. © 2017, National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163803
Appears in Collections:气候变化与战略

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作者单位: Bardeen, C.G., Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307, United States; Garcia, R.R., Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307, United States; Toon, O.B., Laboratory for Atmospheric and Space Physics, Department of Atmospheric and Ocean Sciences, University of Colorado at Boulder, Boulder, CO 80303, United States; Conley, A.J., Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO 80307, United States

Recommended Citation:
Bardeen C.G.,Garcia R.R.,Toon O.B.,et al. On transient climate change at the Cretaceous−Paleogene boundary due to atmospheric soot injections[J]. Proceedings of the National Academy of Sciences of the United States of America,2017-01-01,114(36)
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