Does ocean acidification induce an upward flux of marine aggregates?
International audience The adsorption of anthropogenic atmospheric carbon dioxide (CO 2 ) 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 a...
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ftinsu:oai:HAL:hal-00297997v1 2023-11-12T04:23:49+01:00 Does ocean acidification induce an upward flux of marine aggregates? Mari, Xavier UR 103 (IRD) 2008-04-15 https://hal.science/hal-00297997 https://hal.science/hal-00297997/document https://hal.science/hal-00297997/file/bgd-5-1631-2008.pdf en eng HAL CCSD European Geosciences Union hal-00297997 https://hal.science/hal-00297997 https://hal.science/hal-00297997/document https://hal.science/hal-00297997/file/bgd-5-1631-2008.pdf IRD: fdi:010044054 info:eu-repo/semantics/OpenAccess ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.science/hal-00297997 Biogeosciences Discussions, 2008, 5 (2), pp.1631-1654 [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2008 ftinsu 2023-10-25T16:28:21Z International audience The adsorption of anthropogenic atmospheric carbon dioxide (CO 2 ) 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 CO 2 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 Institut national des sciences de l'Univers: HAL-INSU |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Mari, Xavier Does ocean acidification induce an upward flux of marine aggregates? |
topic_facet |
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The adsorption of anthropogenic atmospheric carbon dioxide (CO 2 ) 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 CO 2 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. |
author2 |
UR 103 (IRD) |
format |
Article in Journal/Newspaper |
author |
Mari, Xavier |
author_facet |
Mari, Xavier |
author_sort |
Mari, Xavier |
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 |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00297997 https://hal.science/hal-00297997/document https://hal.science/hal-00297997/file/bgd-5-1631-2008.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.science/hal-00297997 Biogeosciences Discussions, 2008, 5 (2), pp.1631-1654 |
op_relation |
hal-00297997 https://hal.science/hal-00297997 https://hal.science/hal-00297997/document https://hal.science/hal-00297997/file/bgd-5-1631-2008.pdf IRD: fdi:010044054 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782338472028143616 |