Aggregation as a function of P-CO2 and mineral particles
International audience A laboratory experiment was designed to investigate the effects of ocean acidification three levels) in the presence or absence of the clay mineral illite (five concentrations) on the coagulation of organic particles. The formation of aggregates. 1 mm from marine detritus and...
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ftunivnantes:oai:HAL:hal-02550589v1 2023-05-15T17:49:51+02:00 Aggregation as a function of P-CO2 and mineral particles Passow, Uta de La Rocha, Christina L. Fairfield, Caitlin Schmidt, Katrin Marine Science Institute Santa Barbara (MSI) University of California Santa Barbara (UC Santa Barbara) University of California (UC)-University of California (UC) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2014 https://hal.archives-ouvertes.fr/hal-02550589 https://doi.org/10.4319/lo.2014.59.2.0532 en eng HAL CCSD Association for the Sciences of Limnology and Oceanography info:eu-repo/semantics/altIdentifier/doi/10.4319/lo.2014.59.2.0532 hal-02550589 https://hal.archives-ouvertes.fr/hal-02550589 doi:10.4319/lo.2014.59.2.0532 ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.archives-ouvertes.fr/hal-02550589 Limnology and Oceanography, 2014, 59 (2), pp.532--547. ⟨10.4319/lo.2014.59.2.0532⟩ ACL TRANSPARENT EXOPOLYMER PARTICLES ORGANIC-CARBON FLUXES SINKING VELOCITY OCEAN ACIDIFICATION MARINE SNOW SETTLING VELOCITIES RESPIRATION RATES FECAL PELLETS DIATOM BLOOM CO2 [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 2014 ftunivnantes https://doi.org/10.4319/lo.2014.59.2.0532 2022-11-30T01:15:48Z International audience A laboratory experiment was designed to investigate the effects of ocean acidification three levels) in the presence or absence of the clay mineral illite (five concentrations) on the coagulation of organic particles. The formation of aggregates. 1 mm from marine detritus and phytoplankton, and their characteristics and sinking velocity, were monitored during the 48 h experiment. Aggregation of particulate organic carbon POC) was independent of both partial pressure of carbon dioxide (P-CO2) and illite addition, implying that the fraction of POC available for export is not affected by either mineral supply or ocean acidification conditions up to ambient + 52.7 Pa P-CO2 (+ 520 ppm). This was true even though the illite appreciably influenced aggregate size, number, and characteristics, including the percentage of transparent exopolymer particles (TEP) incorporated in aggregates. Carbonate chemistry, in the presence of illite, did affect particle formation by clay, carbon, and TEP at the micrometer scale (allocation between dissolved and particulate pools). Our experiment did not resolve processes on this scale well and it remains to be seen if such shifts in the size spectrum of organic carbon and minerals are relevant for the biological pump. High illite content led to small aggregates with a low average sinking velocity. In the absence of biological changes to particle production or loss, coagulation of POC, which is central to the biological pump, is not influenced by ocean acidification or dust input, but sinking velocity and, hence, flux attenuation of POC are likely to be affected by changes in dust input. Article in Journal/Newspaper Ocean acidification Université de Nantes: HAL-UNIV-NANTES Limnology and Oceanography 59 2 532 547 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
ACL TRANSPARENT EXOPOLYMER PARTICLES ORGANIC-CARBON FLUXES SINKING VELOCITY OCEAN ACIDIFICATION MARINE SNOW SETTLING VELOCITIES RESPIRATION RATES FECAL PELLETS DIATOM BLOOM CO2 [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
ACL TRANSPARENT EXOPOLYMER PARTICLES ORGANIC-CARBON FLUXES SINKING VELOCITY OCEAN ACIDIFICATION MARINE SNOW SETTLING VELOCITIES RESPIRATION RATES FECAL PELLETS DIATOM BLOOM CO2 [SDE.BE]Environmental Sciences/Biodiversity and Ecology Passow, Uta de La Rocha, Christina L. Fairfield, Caitlin Schmidt, Katrin Aggregation as a function of P-CO2 and mineral particles |
topic_facet |
ACL TRANSPARENT EXOPOLYMER PARTICLES ORGANIC-CARBON FLUXES SINKING VELOCITY OCEAN ACIDIFICATION MARINE SNOW SETTLING VELOCITIES RESPIRATION RATES FECAL PELLETS DIATOM BLOOM CO2 [SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience A laboratory experiment was designed to investigate the effects of ocean acidification three levels) in the presence or absence of the clay mineral illite (five concentrations) on the coagulation of organic particles. The formation of aggregates. 1 mm from marine detritus and phytoplankton, and their characteristics and sinking velocity, were monitored during the 48 h experiment. Aggregation of particulate organic carbon POC) was independent of both partial pressure of carbon dioxide (P-CO2) and illite addition, implying that the fraction of POC available for export is not affected by either mineral supply or ocean acidification conditions up to ambient + 52.7 Pa P-CO2 (+ 520 ppm). This was true even though the illite appreciably influenced aggregate size, number, and characteristics, including the percentage of transparent exopolymer particles (TEP) incorporated in aggregates. Carbonate chemistry, in the presence of illite, did affect particle formation by clay, carbon, and TEP at the micrometer scale (allocation between dissolved and particulate pools). Our experiment did not resolve processes on this scale well and it remains to be seen if such shifts in the size spectrum of organic carbon and minerals are relevant for the biological pump. High illite content led to small aggregates with a low average sinking velocity. In the absence of biological changes to particle production or loss, coagulation of POC, which is central to the biological pump, is not influenced by ocean acidification or dust input, but sinking velocity and, hence, flux attenuation of POC are likely to be affected by changes in dust input. |
author2 |
Marine Science Institute Santa Barbara (MSI) University of California Santa Barbara (UC Santa Barbara) University of California (UC)-University of California (UC) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Passow, Uta de La Rocha, Christina L. Fairfield, Caitlin Schmidt, Katrin |
author_facet |
Passow, Uta de La Rocha, Christina L. Fairfield, Caitlin Schmidt, Katrin |
author_sort |
Passow, Uta |
title |
Aggregation as a function of P-CO2 and mineral particles |
title_short |
Aggregation as a function of P-CO2 and mineral particles |
title_full |
Aggregation as a function of P-CO2 and mineral particles |
title_fullStr |
Aggregation as a function of P-CO2 and mineral particles |
title_full_unstemmed |
Aggregation as a function of P-CO2 and mineral particles |
title_sort |
aggregation as a function of p-co2 and mineral particles |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.archives-ouvertes.fr/hal-02550589 https://doi.org/10.4319/lo.2014.59.2.0532 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
ISSN: 0024-3590 EISSN: 1939-5590 Limnology and Oceanography https://hal.archives-ouvertes.fr/hal-02550589 Limnology and Oceanography, 2014, 59 (2), pp.532--547. ⟨10.4319/lo.2014.59.2.0532⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.4319/lo.2014.59.2.0532 hal-02550589 https://hal.archives-ouvertes.fr/hal-02550589 doi:10.4319/lo.2014.59.2.0532 |
op_doi |
https://doi.org/10.4319/lo.2014.59.2.0532 |
container_title |
Limnology and Oceanography |
container_volume |
59 |
container_issue |
2 |
container_start_page |
532 |
op_container_end_page |
547 |
_version_ |
1766156358018662400 |