DOI: 10.1016/j.epsl.2020.116174
论文题名: Climatic fluctuations modeled for carbon and sulfur emissions from end-Triassic volcanism
作者: Landwehrs J.P. ; Feulner G. ; Hofmann M. ; Petri S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 537 语种: 英语
英文关键词: Central Atlantic Magmatic Province
; Earth System modeling
; end-Triassic extinction
; paleoclimate
; volcanic climate impacts
Scopus关键词: Biogeochemistry
; Carbon
; Earth (planet)
; Ecology
; Global warming
; Marine biology
; Sea level
; Sulfur
; Sulfur compounds
; Volcanoes
; Central atlantic magmatic provinces
; Climate impacts
; Earth system model
; Paleoclimates
; Triassic
; Climate models
; annual variation
; climate effect
; climate variation
; large igneous province
; paleoclimate
; pH
; sulfur emission
; Triassic
; volcanism
; Scleractinia
英文摘要: Throughout the history of complex life, Earth's climate and biogeochemical cycles have been perturbed by Large Igneous Province (LIP) volcanism, with several LIP episodes correlating with major mass extinction events. Yet many aspects of the interplay between geological, climatic and ecological processes in the Earth System during these times of global upheaval remain poorly understood. This study focuses on the Central Atlantic Magmatic Province and the associated extinction event in the latest Triassic, about 201 million years ago. Although climate and carbon cycle models successfully reproduce aspects of the end-Triassic environmental changes, many questions regarding the causal and temporal relations behind them remain unresolved. Here, we report an effort to model and quantify the dynamic response of the Earth System to short pulses of volcanogenic volatile emissions for an ensemble of emission scenarios. For the first time in the context of the end-Triassic events, this is done with a coupled climate model and under consideration of both carbon and sulfur emissions. Tested are pulses with ∼1−6 kyr duration during which 2500−7500GtC are emitted and 0−500GtS form stratospheric sulfate aerosols. The simultaneous emission of carbon and sulfur during one pulse of volcanic activity causes climatic fluctuations on annual to millennial timescales: A sequence of transient global cooling and subsequent sustained warming, overprinted with high interannual variability. The simulated maximum global warming ranges from +1.8 to +4.4 °C, while the amplitude of cooling is considerably higher in the upper range of the tested sulfur emission scenarios. The magnitude of temperature change varies regionally, being lowest in the Tethys realm. Changes in steric sea level (∼1−3 m) and ocean overturning strength, a surface ocean pH decrease (∼0.2−0.4) and a drop of the carbonate saturation especially in the Tethys are also obtained from the simulations during each emission pulse. By evaluating the simulated temperature changes against thermal tolerance limits of stony corals in a simplified manner, we find that these are not clearly transgressed on a global scale in the simulated warming scenarios. However, the climatic variability potentially introduced by the volcanic forcing would have represented significant stress for marine organisms. This study represents a significant step towards integrating multiple volcanic forcing mechanisms and environmental response processes in space and time to yield a more complete picture of impacts of CAMP volcanism and LIPs in general. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158281
Appears in Collections: 气候变化与战略
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作者单位: Department of Geodynamics and Sedimentology, University of Vienna, Althanstraße 14, Vienna, 1090, Austria; Earth System Analysis, Potsdam Institute for Climate Impact Research, Member of the Leibniz Association, P.O. Box 601203, Potsdam, D-14412, Germany
Recommended Citation:
Landwehrs J.P.,Feulner G.,Hofmann M.,et al. Climatic fluctuations modeled for carbon and sulfur emissions from end-Triassic volcanism[J]. Earth and Planetary Science Letters,2020-01-01,537