Optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the Southern Ocean
We recorded vertical profiles of size distributions of particles (ranging from 0.052 to several mm in equivalent spherical diameter) in the natural iron-fertilized bloom southeast of Kerguelen Island (Southern Ocean) and in surrounding high-nutrient, low-chlorophyll (HNLC) waters with an Under Water...
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ftarchimer:oai:archimer.ifremer.fr:32507 2023-05-15T18:25:09+02:00 Optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the Southern Ocean Jouandet, Marie-paule Trull, Thomas W. Guidi, Lionel Picheral, Marc Ebersbach, Friederike Stemmann, Lars Blain, Stephane 2011-05 application/pdf https://archimer.ifremer.fr/doc/00214/32507/30994.pdf https://doi.org/10.4319/lo.2011.56.3.1130 https://archimer.ifremer.fr/doc/00214/32507/ eng eng Amer Soc Limnology Oceanography https://archimer.ifremer.fr/doc/00214/32507/30994.pdf doi:10.4319/lo.2011.56.3.1130 https://archimer.ifremer.fr/doc/00214/32507/ 2011, by the American Society of Limnology and Oceanography, Inc. info:eu-repo/semantics/openAccess restricted use Limnology And Oceanography (0024-3590) (Amer Soc Limnology Oceanography), 2011-05 , Vol. 56 , N. 3 , P. 1130-1140 text Publication info:eu-repo/semantics/article 2011 ftarchimer https://doi.org/10.4319/lo.2011.56.3.1130 2021-09-23T20:24:54Z We recorded vertical profiles of size distributions of particles (ranging from 0.052 to several mm in equivalent spherical diameter) in the natural iron-fertilized bloom southeast of Kerguelen Island (Southern Ocean) and in surrounding high-nutrient, low-chlorophyll (HNLC) waters with an Under Water Video Profiler during the Kerguelen Ocean and Plateau Compared Study cruise (Jan-Feb 2005). Total particle numerical abundance and total particle volume (TPV) in the 0-200-m layer were respectively 3-fold and 20-fold higher in the bloom, and integrated TPV was correlated to integrated chlorophyll concentration. The difference persisted well into the ocean interior with a 10-fold higher TPV at 400-m depth beneath the natural iron-fertilized bloom. Below 400 m, increases in TPV values at the bloom stations reflect the suspension of bottom sediments. Bloom waters had a greater proportion of large particles from the surface to 400 m and also exhibited an increase of this proportion with depth compared to HNLC waters. Multiple visits to the bloom reference Sta. A3, suggest preferential removal of large particles as the bloom declined. Comparing our particle abundance size spectra with those observed previously in polyacrylamide gel-filled sediment traps allows us to estimate mesopelagic particle sinking rates. These results suggest that particles sink faster in the HNLC waters than beneath the bloom. The fact that sinking speeds were not a simple monotonic function of particle size and varied spatially highlights the need to go beyond parameterizations of sinking rate as a function of size alone. Article in Journal/Newspaper Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Kerguelen Kerguelen Island ENVELOPE(69.500,69.500,-49.250,-49.250) Southern Ocean Limnology and Oceanography 56 3 1130 1140 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
We recorded vertical profiles of size distributions of particles (ranging from 0.052 to several mm in equivalent spherical diameter) in the natural iron-fertilized bloom southeast of Kerguelen Island (Southern Ocean) and in surrounding high-nutrient, low-chlorophyll (HNLC) waters with an Under Water Video Profiler during the Kerguelen Ocean and Plateau Compared Study cruise (Jan-Feb 2005). Total particle numerical abundance and total particle volume (TPV) in the 0-200-m layer were respectively 3-fold and 20-fold higher in the bloom, and integrated TPV was correlated to integrated chlorophyll concentration. The difference persisted well into the ocean interior with a 10-fold higher TPV at 400-m depth beneath the natural iron-fertilized bloom. Below 400 m, increases in TPV values at the bloom stations reflect the suspension of bottom sediments. Bloom waters had a greater proportion of large particles from the surface to 400 m and also exhibited an increase of this proportion with depth compared to HNLC waters. Multiple visits to the bloom reference Sta. A3, suggest preferential removal of large particles as the bloom declined. Comparing our particle abundance size spectra with those observed previously in polyacrylamide gel-filled sediment traps allows us to estimate mesopelagic particle sinking rates. These results suggest that particles sink faster in the HNLC waters than beneath the bloom. The fact that sinking speeds were not a simple monotonic function of particle size and varied spatially highlights the need to go beyond parameterizations of sinking rate as a function of size alone. |
format |
Article in Journal/Newspaper |
author |
Jouandet, Marie-paule Trull, Thomas W. Guidi, Lionel Picheral, Marc Ebersbach, Friederike Stemmann, Lars Blain, Stephane |
spellingShingle |
Jouandet, Marie-paule Trull, Thomas W. Guidi, Lionel Picheral, Marc Ebersbach, Friederike Stemmann, Lars Blain, Stephane Optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the Southern Ocean |
author_facet |
Jouandet, Marie-paule Trull, Thomas W. Guidi, Lionel Picheral, Marc Ebersbach, Friederike Stemmann, Lars Blain, Stephane |
author_sort |
Jouandet, Marie-paule |
title |
Optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the Southern Ocean |
title_short |
Optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the Southern Ocean |
title_full |
Optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the Southern Ocean |
title_fullStr |
Optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the Southern Ocean |
title_full_unstemmed |
Optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the Southern Ocean |
title_sort |
optical imaging of mesopelagic particles indicates deep carbon flux beneath a natural iron-fertilized bloom in the southern ocean |
publisher |
Amer Soc Limnology Oceanography |
publishDate |
2011 |
url |
https://archimer.ifremer.fr/doc/00214/32507/30994.pdf https://doi.org/10.4319/lo.2011.56.3.1130 https://archimer.ifremer.fr/doc/00214/32507/ |
long_lat |
ENVELOPE(69.500,69.500,-49.250,-49.250) |
geographic |
Kerguelen Kerguelen Island Southern Ocean |
geographic_facet |
Kerguelen Kerguelen Island Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Limnology And Oceanography (0024-3590) (Amer Soc Limnology Oceanography), 2011-05 , Vol. 56 , N. 3 , P. 1130-1140 |
op_relation |
https://archimer.ifremer.fr/doc/00214/32507/30994.pdf doi:10.4319/lo.2011.56.3.1130 https://archimer.ifremer.fr/doc/00214/32507/ |
op_rights |
2011, by the American Society of Limnology and Oceanography, Inc. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.4319/lo.2011.56.3.1130 |
container_title |
Limnology and Oceanography |
container_volume |
56 |
container_issue |
3 |
container_start_page |
1130 |
op_container_end_page |
1140 |
_version_ |
1766206401114275840 |