Aggregation as a function of and mineral particles
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...
Published in: | Limnology and Oceanography |
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crwiley:10.4319/lo.2014.59.2.0532 2024-09-15T18:27:47+00:00 Aggregation as a function of and mineral particles Passow, Uta De La Rocha, Christina L. Fairfield, Caitlin Schmidt, Katrin 2014 http://dx.doi.org/10.4319/lo.2014.59.2.0532 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2014.59.2.0532 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2014.59.2.0532 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Limnology and Oceanography volume 59, issue 2, page 532-547 ISSN 0024-3590 1939-5590 journal-article 2014 crwiley https://doi.org/10.4319/lo.2014.59.2.0532 2024-08-20T04:15:53Z 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 CO 2 ) 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 CO 2 (+ 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 Wiley Online Library Limnology and Oceanography 59 2 532 547 |
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Wiley Online Library |
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English |
description |
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 CO 2 ) 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 CO 2 (+ 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. |
format |
Article in Journal/Newspaper |
author |
Passow, Uta De La Rocha, Christina L. Fairfield, Caitlin Schmidt, Katrin |
spellingShingle |
Passow, Uta De La Rocha, Christina L. Fairfield, Caitlin Schmidt, Katrin Aggregation as a function of and mineral particles |
author_facet |
Passow, Uta De La Rocha, Christina L. Fairfield, Caitlin Schmidt, Katrin |
author_sort |
Passow, Uta |
title |
Aggregation as a function of and mineral particles |
title_short |
Aggregation as a function of and mineral particles |
title_full |
Aggregation as a function of and mineral particles |
title_fullStr |
Aggregation as a function of and mineral particles |
title_full_unstemmed |
Aggregation as a function of and mineral particles |
title_sort |
aggregation as a function of and mineral particles |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.4319/lo.2014.59.2.0532 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.4319%2Flo.2014.59.2.0532 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.4319/lo.2014.59.2.0532 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Limnology and Oceanography volume 59, issue 2, page 532-547 ISSN 0024-3590 1939-5590 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
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_ |
1810469038384480256 |