A numerical examination of the effect of sulfide dissolution on silicate weathering
Silicate weathering regulates climate on geological time scales as a net, climate-sensitive sink of atmospheric CO 2 . On the other hand, sulfuric acid produced through sulfide dissolution affects silicate weathering, diminishing its effectiveness as a climate regulator based on evidence from river...
Published in: | Earth and Planetary Science Letters |
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Online Access: | http://www.osti.gov/servlets/purl/1800244 https://www.osti.gov/biblio/1800244 https://doi.org/10.1016/j.epsl.2020.116239 |
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ftosti:oai:osti.gov:1800244 2023-07-30T04:02:55+02:00 A numerical examination of the effect of sulfide dissolution on silicate weathering Kanzaki, Yoshiki Brantley, Susan L. Kump, Lee R. 2022-05-19 application/pdf http://www.osti.gov/servlets/purl/1800244 https://www.osti.gov/biblio/1800244 https://doi.org/10.1016/j.epsl.2020.116239 unknown http://www.osti.gov/servlets/purl/1800244 https://www.osti.gov/biblio/1800244 https://doi.org/10.1016/j.epsl.2020.116239 doi:10.1016/j.epsl.2020.116239 58 GEOSCIENCES 2022 ftosti https://doi.org/10.1016/j.epsl.2020.116239 2023-07-11T10:04:36Z Silicate weathering regulates climate on geological time scales as a net, climate-sensitive sink of atmospheric CO 2 . On the other hand, sulfuric acid produced through sulfide dissolution affects silicate weathering, diminishing its effectiveness as a climate regulator based on evidence from river chemistry. This study takes a theoretical approach to quantitatively examine the effect of sulfide dissolution, coupling a one-dimensional model of pyrite weathering to that of albite transformation to kaolinite. The coupled model reveals that when the reaction front of sulfide is deeper than that of silicates reacting with CO 2 , the silicate-weathering feedback on climate is not directly affected by sulfide dissolution, but only indirectly through oceanic processes such as reverse weathering and carbonate deposition. In turn, when sulfide dissolution occurs within zones of CO 2 -silicate reactions close to the surface, the feedback between climate and silicate weathering can be significantly weakened because sulfuric acid competes effectively with carbonic acid in mineral dissolution. As the depth of the sulfide reaction front can be changed by variations in water table depth, the latter feedback weakening could have occurred in concert with climate-change-driven water table fluctuations, amplifying atmospheric CO 2 variations during the Phanerozoic. Other/Unknown Material Carbonic acid SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Earth and Planetary Science Letters 539 116239 |
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58 GEOSCIENCES Kanzaki, Yoshiki Brantley, Susan L. Kump, Lee R. A numerical examination of the effect of sulfide dissolution on silicate weathering |
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58 GEOSCIENCES |
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Silicate weathering regulates climate on geological time scales as a net, climate-sensitive sink of atmospheric CO 2 . On the other hand, sulfuric acid produced through sulfide dissolution affects silicate weathering, diminishing its effectiveness as a climate regulator based on evidence from river chemistry. This study takes a theoretical approach to quantitatively examine the effect of sulfide dissolution, coupling a one-dimensional model of pyrite weathering to that of albite transformation to kaolinite. The coupled model reveals that when the reaction front of sulfide is deeper than that of silicates reacting with CO 2 , the silicate-weathering feedback on climate is not directly affected by sulfide dissolution, but only indirectly through oceanic processes such as reverse weathering and carbonate deposition. In turn, when sulfide dissolution occurs within zones of CO 2 -silicate reactions close to the surface, the feedback between climate and silicate weathering can be significantly weakened because sulfuric acid competes effectively with carbonic acid in mineral dissolution. As the depth of the sulfide reaction front can be changed by variations in water table depth, the latter feedback weakening could have occurred in concert with climate-change-driven water table fluctuations, amplifying atmospheric CO 2 variations during the Phanerozoic. |
author |
Kanzaki, Yoshiki Brantley, Susan L. Kump, Lee R. |
author_facet |
Kanzaki, Yoshiki Brantley, Susan L. Kump, Lee R. |
author_sort |
Kanzaki, Yoshiki |
title |
A numerical examination of the effect of sulfide dissolution on silicate weathering |
title_short |
A numerical examination of the effect of sulfide dissolution on silicate weathering |
title_full |
A numerical examination of the effect of sulfide dissolution on silicate weathering |
title_fullStr |
A numerical examination of the effect of sulfide dissolution on silicate weathering |
title_full_unstemmed |
A numerical examination of the effect of sulfide dissolution on silicate weathering |
title_sort |
numerical examination of the effect of sulfide dissolution on silicate weathering |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1800244 https://www.osti.gov/biblio/1800244 https://doi.org/10.1016/j.epsl.2020.116239 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_relation |
http://www.osti.gov/servlets/purl/1800244 https://www.osti.gov/biblio/1800244 https://doi.org/10.1016/j.epsl.2020.116239 doi:10.1016/j.epsl.2020.116239 |
op_doi |
https://doi.org/10.1016/j.epsl.2020.116239 |
container_title |
Earth and Planetary Science Letters |
container_volume |
539 |
container_start_page |
116239 |
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1772813811404767232 |