Does ocean acidification induce an upward flux of marine aggregates?
The absorption of anthropogenic atmospheric carbon dioxide (CO2) by the ocean provokes its acidification. This acidification may alter several oceanic processes, including the export of biogenic carbon from the upper layer of the ocean, hence providing a feedback on rising atmospheric carbon concent...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00031276 2023-05-15T17:50:33+02:00 Does ocean acidification induce an upward flux of marine aggregates? Mari, X. 2008-07 electronic https://doi.org/10.5194/bg-5-1023-2008 https://noa.gwlb.de/receive/cop_mods_00031276 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031230/bg-5-1023-2008.pdf https://bg.copernicus.org/articles/5/1023/2008/bg-5-1023-2008.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-5-1023-2008 https://noa.gwlb.de/receive/cop_mods_00031276 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031230/bg-5-1023-2008.pdf https://bg.copernicus.org/articles/5/1023/2008/bg-5-1023-2008.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2008 ftnonlinearchiv https://doi.org/10.5194/bg-5-1023-2008 2022-02-08T22:46:49Z The absorption of anthropogenic atmospheric carbon dioxide (CO2) by the ocean provokes its acidification. This acidification may alter several oceanic processes, including the export of biogenic carbon from the upper layer of the ocean, hence providing a feedback on rising atmospheric carbon concentrations. The effect of seawater acidification on transparent exopolymeric particles (TEP) driven aggregation and sedimentation processes were investigated by studying the interactions between latex beads and TEP precursors collected in the lagoon of New Caledonia. A suspension of TEP and beads was prepared and the formation of mixed aggregates was monitored as a function of pH under increasing turbulence intensities. The pH was controlled by addition of sulfuric acid. Aggregation and sedimentation processes driven by TEP were drastically reduced when the pH of seawater decreases within the expected limits imposed by increased anthropogenic CO2 emissions. In addition to the diminution of TEP sticking properties, the diminution of seawater pH led to a significant increase of the TEP pool, most likely due to swollen structures. A diminution of seawater pH by 0.2 units or more led to a stop or a reversal of the downward flux of particles. If applicable to oceanic conditions, the sedimentation of marine aggregates may slow down or even stop as the pH decreases, and the vertical flux of organic carbon may reverse. This would enhance both rising atmospheric carbon and ocean acidification. Article in Journal/Newspaper Ocean acidification Niedersächsisches Online-Archiv NOA Biogeosciences 5 4 1023 1031 |
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article Verlagsveröffentlichung Mari, X. Does ocean acidification induce an upward flux of marine aggregates? |
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article Verlagsveröffentlichung |
description |
The absorption of anthropogenic atmospheric carbon dioxide (CO2) by the ocean provokes its acidification. This acidification may alter several oceanic processes, including the export of biogenic carbon from the upper layer of the ocean, hence providing a feedback on rising atmospheric carbon concentrations. The effect of seawater acidification on transparent exopolymeric particles (TEP) driven aggregation and sedimentation processes were investigated by studying the interactions between latex beads and TEP precursors collected in the lagoon of New Caledonia. A suspension of TEP and beads was prepared and the formation of mixed aggregates was monitored as a function of pH under increasing turbulence intensities. The pH was controlled by addition of sulfuric acid. Aggregation and sedimentation processes driven by TEP were drastically reduced when the pH of seawater decreases within the expected limits imposed by increased anthropogenic CO2 emissions. In addition to the diminution of TEP sticking properties, the diminution of seawater pH led to a significant increase of the TEP pool, most likely due to swollen structures. A diminution of seawater pH by 0.2 units or more led to a stop or a reversal of the downward flux of particles. If applicable to oceanic conditions, the sedimentation of marine aggregates may slow down or even stop as the pH decreases, and the vertical flux of organic carbon may reverse. This would enhance both rising atmospheric carbon and ocean acidification. |
format |
Article in Journal/Newspaper |
author |
Mari, X. |
author_facet |
Mari, X. |
author_sort |
Mari, X. |
title |
Does ocean acidification induce an upward flux of marine aggregates? |
title_short |
Does ocean acidification induce an upward flux of marine aggregates? |
title_full |
Does ocean acidification induce an upward flux of marine aggregates? |
title_fullStr |
Does ocean acidification induce an upward flux of marine aggregates? |
title_full_unstemmed |
Does ocean acidification induce an upward flux of marine aggregates? |
title_sort |
does ocean acidification induce an upward flux of marine aggregates? |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/bg-5-1023-2008 https://noa.gwlb.de/receive/cop_mods_00031276 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031230/bg-5-1023-2008.pdf https://bg.copernicus.org/articles/5/1023/2008/bg-5-1023-2008.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-5-1023-2008 https://noa.gwlb.de/receive/cop_mods_00031276 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00031230/bg-5-1023-2008.pdf https://bg.copernicus.org/articles/5/1023/2008/bg-5-1023-2008.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-5-1023-2008 |
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Biogeosciences |
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1031 |
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