DOI: 10.1016/j.gloplacha.2012.06.006
论文题名: Precession-driven monsoon variability at the Permian-Triassic boundary - Implications for anoxia and the mass extinction
作者: Winguth A. ; Winguth C.
刊名: Global and Planetary Change
ISSN: 0921-8296
出版年: 2013
卷: 105 起始页码: 160
结束页码: 170
语种: 英语
英文关键词: Anoxia
; Climate
; Extinction
; Modeling
; Monsoon
; Orbital
; Permian
; Triassic
Scopus关键词: Anoxia
; Climate
; Monsoon
; Orbital
; Permian
; Triassic
; Atmospheric thermodynamics
; Climate models
; Digital storage
; Lasers
; Light extinction
; Models
; Oxygen supply
; Geology
; anoxia
; anoxic conditions
; climate modeling
; colloid
; data set
; dissolved oxygen
; euphotic zone
; extinction
; mass extinction
; monsoon
; oxygen
; oxygen minimum layer
; Permian-Triassic boundary
; sulfide
; water mass
; zooplankton
英文摘要: By the end of the Late Permian, most continents had collided to form the supercontinent of Pangea. The associated climatic changes at the Permian-Triassic boundary coincided with the most severe mass extinction in the Phanerozoic. One extinction hypothesis favors a climatic response to an increase in large-scale volcanism resulting in ocean stagnation and widespread anoxia with fatal consequences for marine and land organisms. Recent interpretations of geochemical data suggest that orbitally-driven periodic upwelling of toxic hydrogen-sulfide rich water masses contributed to the extinction of species.In this paper, we use the Community Climate System Model (CCSM3) in order to explore the effect of eccentricity-modulated changes of the precession on the strength of Pangean megamonsoons and their impact on productivity and oxygen distribution. The climate model simulates high variability in monsoonal precipitation, trade winds and equatorial upwelling in response to precessional extremes, leading to remarkable fluctuations in the export of carbon from the euphotic zone and hence reduction in dissolved oxygen concentrations in subsurface layers. These findings are in general agreement with increased primary productivity, intensified euxinia within the oxygen-minimum zone, and decimation of the radiolarian zooplankton community as inferred from Japanese marine sections.Strong changes in river run-off linked to precipitation oscillations possibly led to a high variability in the nutrient supply to the Tethys Ocean, thus affecting regional productivity and oxygen distribution. The model results suggest that orbital variability in the sedimentary record and the associated extinction of species are related rather to periodic anoxia in near surface-to-intermediate depth than to widespread anoxic events in the Panthalassic deep-sea. © 2012 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876995478&doi=10.1016%2fj.gloplacha.2012.06.006&partnerID=40&md5=da3f7fc784a18cb02d068653c11438ef
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11202
Appears in Collections: 全球变化的国际研究计划
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作者单位: Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019-0049, United States
Recommended Citation:
Winguth A.,Winguth C.. Precession-driven monsoon variability at the Permian-Triassic boundary - Implications for anoxia and the mass extinction[J]. Global and Planetary Change,2013-01-01,105.