DOI: 10.1038/ngeo2095
论文题名: Production of sulphate-rich vapour during the Chicxulub impact and implications for ocean acidification
作者: Ohno S. ; Kadono T. ; Kurosawa K. ; Hamura T. ; Sakaiya T. ; Shigemori K. ; Hironaka Y. ; Sano T. ; Watari T. ; Otani K. ; Matsui T. ; Sugita S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期: 4 起始页码: 279
结束页码: 282
语种: 英语
Scopus关键词: acidification
; aerosol composition
; atmospheric pollution
; benthic foraminifera
; Cretaceous
; Paleogene
; planktonic foraminifera
; population decline
; sulfate
; sulfuric acid
; survival
; vaporization
; Atlantic Ocean
; Bay of Campeche
; Chicxulub Crater
; Gulf of Mexico
; Mexico [North America]
; Yucatan
; Foraminifera
英文摘要: The mass extinction event at the Cretaceous/Palaeogene boundary 65.5 Myr ago has been widely attributed to the Chicxulub impact, but the mechanisms of extinction remain debated. In the oceans, near-surface planktonic foraminifera suffered severe declines, in contrast to the relatively high survival rates of bottom-dwelling benthic foraminifera. The vapour produced by an impact into Chicxulubâ €™ s target rocks, which include sulphate-rich anhydrite, could have led to global acid rain, which can explain the pattern of oceanic extinctions. However, it has been suggested that most of the sulphur in the target rocks would have been released as sulphur dioxide and would have stayed in the stratosphere for a long time. Here we show, from impact experiments into anhydrite at velocities exceeding 10 km s â ̂'1, that sulphur trioxide dominates over sulphur dioxide in the resulting vapour cloud. Our experiments suggest that the Chicxulub impact released a huge quantity of sulphur trioxide into the atmosphere, where it would have rapidly combined with water vapour to form sulphuric acid aerosol particles. We also find, using a theoretical model of aerosol coagulation following the Chicxulub impact, that larger silicate particles ejected during the impact efficiently scavenge sulphuric acid aerosol particles and deliver the sulphuric acid to the surface within a few days. The rapid surface deposition of sulphuric acid would cause severe ocean acidification and account for preferential extinction of planktonic over benthic foraminifera. © 2014 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106519
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Planetary Exploration Research Center, Chiba Institute of Technology, Chiba 275-0016, Japan; University of Occupational and Environmental Health, Kitakyushu 807-8555, Japan; Department of Complexity Science and Engineering, University of Tokyo, Kashiwa 277-8561, Japan; Department of Earth and Space Science, Graduate School of Science, Osaka University, Osaka 560-0043, Japan; Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan; Institut National de la Recherche Scientifique, Énergie Matériaux Télécommunications, Varennes J3X 1S2, Canada
Recommended Citation:
Ohno S.,Kadono T.,Kurosawa K.,et al. Production of sulphate-rich vapour during the Chicxulub impact and implications for ocean acidification[J]. Nature Geoscience,2014-01-01,7(4)