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Modeling the carbon-sulfate interplays in climate changes related to the emplacement of continental flood basalts

Mickael Mussard, Guillaume Le Hir, Frederic Fluteau, Vincent Lefebvre and Yves Godderis
Modeling the carbon-sulfate interplays in climate changes related to the emplacement of continental flood basalts (in Volcanism, impacts, and mass extinctions; causes and effects, Gerta Keller (editor) and Andrew C. Kerr (editor))
Special Paper - Geological Society of America (September 2014) 505: 339-352

Abstract

Climatic and environmental changes are now widely recognized as the main cause of mass extinctions. Global warming that immediately preceded the Cretaceous-Tertiary boundary is regarded as a consequence of CO (sub 2) released during the main phase of Deccan Trap emplacement. Modeling has shown that such global warming cannot be explained by the continuous release of volcanic carbon dioxide. In the present paper, we use a biogeochemical model, coupled to a climate model, to further our understanding of climate changes caused by continental flood basalts. The response of the global climate-carbon-cycle system to sulfur dioxide (SO (sub 2) ) and carbon dioxide (CO (sub 2) ) emissions is investigated, assuming a degassing history consisting of a series of evenly spaced pulses. We find that CO (sub 2) -related warming is enhanced when large-scale SO (sub 2) injections are added. According to our model, we observe that the succession of drastic cooling events induced by sulfate aerosols decreases the efficiency of silicate weathering and destabilizes the carbon cycle during the full time span of trap emplacement. In the case of the Deccan Traps, these transient dis-equilibria lead to a 25% increase in pCO (sub 2) and ensuing warming. The environmental consequences of emplacement of large igneous provinces appear to be even more complex: A SO (sub 2) -related climate feedback may have enhanced the long-term warming due to CO (sub 2) emissions.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 505
Title: Modeling the carbon-sulfate interplays in climate changes related to the emplacement of continental flood basalts
Title: Volcanism, impacts, and mass extinctions; causes and effects
Author(s): Mussard, MickaelLe Hir, GuillaumeFluteau, FredericLefebvre, VincentGodderis, Yves
Author(s): Keller, Gertaeditor
Author(s): Kerr, Andrew C.editor
Affiliation: University Paris Diderot, Institut de Physique du Globe de Paris, Paris, France
Affiliation: Princeton University, Department of Geosciences, Princeton, NJ, United States
Pages: 339-352
Published: 201409
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 65
Accession Number: 2014-085286
Categories: Igneous and metamorphic petrologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Cardiff University, GBR, United KingdomUniversite de Versailles Saint-Quentin-en-Yvelines, FRA, FranceObservatoire Midi-Pyrenees, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201444
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