Aragonite dissolution protects calcite at the seafloor.
peer reviewed In the open ocean, calcium carbonates are mainly found in two mineral forms. Calcite, the least soluble, is widespread at the seafloor, while aragonite, the more soluble, is rarely preserved in marine sediments. Despite its greater solubility, research has shown that aragonite, whose c...
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ftorbi:oai:orbi.ulg.ac.be:2268/289545 2024-10-13T14:10:03+00:00 Aragonite dissolution protects calcite at the seafloor. Sulpis, Olivier Agrawal, Priyanka Wolthers, Mariette Munhoven, Guy Walker, Matthew Middelburg, Jack J SPHERES - ULiège 2022-03-01 https://orbi.uliege.be/handle/2268/289545 https://orbi.uliege.be/bitstream/2268/289545/1/Sulpis-etal.1104.pdf https://doi.org/10.1038/s41467-022-28711-z en eng Nature Research https://www.nature.com/articles/s41467-022-28711-z.pdf 10.5281/zenodo.5741613 urn:issn:2041-1723 https://orbi.uliege.be/handle/2268/289545 info:hdl:2268/289545 info:pmid:35232971 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Nature Communications, 13 (1), 1104 (2022-03-01) Chemistry (all) Biochemistry Genetics and Molecular Biology (all) Physics and Astronomy (all) General Physics and Astronomy General Biochemistry Genetics and Molecular Biology General Chemistry Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2022 ftorbi https://doi.org/10.1038/s41467-022-28711-z 2024-09-27T07:01:48Z peer reviewed In the open ocean, calcium carbonates are mainly found in two mineral forms. Calcite, the least soluble, is widespread at the seafloor, while aragonite, the more soluble, is rarely preserved in marine sediments. Despite its greater solubility, research has shown that aragonite, whose contribution to global pelagic calcification could be at par with that of calcite, is able to reach the deep-ocean. If large quantities of aragonite settle and dissolve at the seafloor, this represents a large source of alkalinity that buffers the deep ocean and favours the preservation of less soluble calcite, acting as a deep-sea, carbonate version of galvanization. Here, we investigate the role of aragonite dissolution on the early diagenesis of calcite-rich sediments using a novel 3D, micrometric-scale reactive-transport model combined with 3D, X-ray tomography structures of natural aragonite and calcite shells. Results highlight the important role of diffusive transport in benthic calcium carbonate dissolution, in agreement with recent work. We show that, locally, aragonite fluxes to the seafloor could be sufficient to suppress calcite dissolution in the top layer of the seabed, possibly causing calcite recrystallization. As aragonite producers are particularly vulnerable to ocean acidification, the proposed galvanizing effect of aragonite could be weakened in the future, and calcite dissolution at the sediment-water interface will have to cover a greater share of CO2 neutralization. SERENATA Article in Journal/Newspaper Ocean acidification University of Liège: ORBi (Open Repository and Bibliography) Nature Communications 13 1 |
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Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Chemistry (all) Biochemistry Genetics and Molecular Biology (all) Physics and Astronomy (all) General Physics and Astronomy General Biochemistry Genetics and Molecular Biology General Chemistry Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Chemistry (all) Biochemistry Genetics and Molecular Biology (all) Physics and Astronomy (all) General Physics and Astronomy General Biochemistry Genetics and Molecular Biology General Chemistry Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Sulpis, Olivier Agrawal, Priyanka Wolthers, Mariette Munhoven, Guy Walker, Matthew Middelburg, Jack J Aragonite dissolution protects calcite at the seafloor. |
topic_facet |
Chemistry (all) Biochemistry Genetics and Molecular Biology (all) Physics and Astronomy (all) General Physics and Astronomy General Biochemistry Genetics and Molecular Biology General Chemistry Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed In the open ocean, calcium carbonates are mainly found in two mineral forms. Calcite, the least soluble, is widespread at the seafloor, while aragonite, the more soluble, is rarely preserved in marine sediments. Despite its greater solubility, research has shown that aragonite, whose contribution to global pelagic calcification could be at par with that of calcite, is able to reach the deep-ocean. If large quantities of aragonite settle and dissolve at the seafloor, this represents a large source of alkalinity that buffers the deep ocean and favours the preservation of less soluble calcite, acting as a deep-sea, carbonate version of galvanization. Here, we investigate the role of aragonite dissolution on the early diagenesis of calcite-rich sediments using a novel 3D, micrometric-scale reactive-transport model combined with 3D, X-ray tomography structures of natural aragonite and calcite shells. Results highlight the important role of diffusive transport in benthic calcium carbonate dissolution, in agreement with recent work. We show that, locally, aragonite fluxes to the seafloor could be sufficient to suppress calcite dissolution in the top layer of the seabed, possibly causing calcite recrystallization. As aragonite producers are particularly vulnerable to ocean acidification, the proposed galvanizing effect of aragonite could be weakened in the future, and calcite dissolution at the sediment-water interface will have to cover a greater share of CO2 neutralization. SERENATA |
author2 |
SPHERES - ULiège |
format |
Article in Journal/Newspaper |
author |
Sulpis, Olivier Agrawal, Priyanka Wolthers, Mariette Munhoven, Guy Walker, Matthew Middelburg, Jack J |
author_facet |
Sulpis, Olivier Agrawal, Priyanka Wolthers, Mariette Munhoven, Guy Walker, Matthew Middelburg, Jack J |
author_sort |
Sulpis, Olivier |
title |
Aragonite dissolution protects calcite at the seafloor. |
title_short |
Aragonite dissolution protects calcite at the seafloor. |
title_full |
Aragonite dissolution protects calcite at the seafloor. |
title_fullStr |
Aragonite dissolution protects calcite at the seafloor. |
title_full_unstemmed |
Aragonite dissolution protects calcite at the seafloor. |
title_sort |
aragonite dissolution protects calcite at the seafloor. |
publisher |
Nature Research |
publishDate |
2022 |
url |
https://orbi.uliege.be/handle/2268/289545 https://orbi.uliege.be/bitstream/2268/289545/1/Sulpis-etal.1104.pdf https://doi.org/10.1038/s41467-022-28711-z |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Nature Communications, 13 (1), 1104 (2022-03-01) |
op_relation |
https://www.nature.com/articles/s41467-022-28711-z.pdf 10.5281/zenodo.5741613 urn:issn:2041-1723 https://orbi.uliege.be/handle/2268/289545 info:hdl:2268/289545 info:pmid:35232971 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/s41467-022-28711-z |
container_title |
Nature Communications |
container_volume |
13 |
container_issue |
1 |
_version_ |
1812817178579173376 |