Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W
An array of four sediment trap moorings recorded the particulate flux across the Antarctic Circumpolar Current (ACC) at 170°W, between November 1996 and January 1998, as part of the US JGOFS-Antarctic Environment and Southern Ocean Process Study (AESOPS) program. The trap locations represent samplin...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2014
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Online Access: | https://researchers.mq.edu.au/en/publications/733aadee-ff03-423e-a347-59fadbe4ffb1 https://doi.org/10.1016/j.dsr.2014.07.008 http://www.scopus.com/inward/record.url?scp=84905917817&partnerID=8YFLogxK |
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ftmacquarieunicr:oai:https://researchers.mq.edu.au:publications/733aadee-ff03-423e-a347-59fadbe4ffb1 2024-06-23T07:47:50+00:00 Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W Grigorov, Ivo Rigual-Hernandez, Andrés S. Honjo, Susumu Kemp, Alan E S Armand, Leanne K. 2014-11 https://researchers.mq.edu.au/en/publications/733aadee-ff03-423e-a347-59fadbe4ffb1 https://doi.org/10.1016/j.dsr.2014.07.008 http://www.scopus.com/inward/record.url?scp=84905917817&partnerID=8YFLogxK eng eng info:eu-repo/semantics/closedAccess Grigorov , I , Rigual-Hernandez , A S , Honjo , S , Kemp , A E S & Armand , L K 2014 , ' Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W ' , Deep-Sea Research Part I: Oceanographic Research Papers , vol. 93 , pp. 1-13 . https://doi.org/10.1016/j.dsr.2014.07.008 Diatom flux Marine snow Particulate flux Ross sea Sediment traps Southwest Pacific article 2014 ftmacquarieunicr https://doi.org/10.1016/j.dsr.2014.07.008 2024-05-29T23:48:40Z An array of four sediment trap moorings recorded the particulate flux across the Antarctic Circumpolar Current (ACC) at 170°W, between November 1996 and January 1998, as part of the US JGOFS-Antarctic Environment and Southern Ocean Process Study (AESOPS) program. The trap locations represent sampling within the Polar Frontal Zone, the Antarctic Polar Front, the Antarctic Zone and the Southern Antarctic Zone. Here we report observations from 1000m below the sea-surface compared to seafloor and surface water distributions. Sub-sample splits from each trap were obtained and total diatom flux and species composition were determined. The diatom fluxes were quantified using both a dilution and a 'spike' method to allow for the rapid repeatability of measurements. Diatom flux was found to be highly seasonal across the ACC particularly at higher latitudes. Marine snow aggregates of intact diatom cells and chains were the major components of the biogenic flux. Siliceous particle size was noted to decrease with increasing latitude, which could be aligned with a shift of the diatom assemblage to small-size species/sea-ice affiliated species. A 'double-structured' diatom flux was recorded at the location of the Antarctic Polar Front trap, with a shift in the diatom assemblage from larger to smaller diatoms in the second flux episode. The sediment trap assemblage shows deviations from the surface water assemblage, while surface sediment samples indicate that significant dissolution occurs after 1000m and at the sediment-water interface. Estimation of diatom biovolumes across the ACC shows that large diatoms have the potential to greatly impact biogenic fluxes to the ocean interior despite their low fluxes. Small species of the genus Fragilariopsis could potentially export as much C org as Fragilariopsis kerguelensis near the retreating ice edge. However, their low abundance in the surface sediments also suggests that these diatoms are a shallow export species. Article in Journal/Newspaper Antarc* Antarctic Ross Sea Sea ice Southern Ocean Macquarie University Research Portal Antarctic Pacific Ross Sea Southern Ocean The Antarctic Deep Sea Research Part I: Oceanographic Research Papers 93 1 13 |
institution |
Open Polar |
collection |
Macquarie University Research Portal |
op_collection_id |
ftmacquarieunicr |
language |
English |
topic |
Diatom flux Marine snow Particulate flux Ross sea Sediment traps Southwest Pacific |
spellingShingle |
Diatom flux Marine snow Particulate flux Ross sea Sediment traps Southwest Pacific Grigorov, Ivo Rigual-Hernandez, Andrés S. Honjo, Susumu Kemp, Alan E S Armand, Leanne K. Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W |
topic_facet |
Diatom flux Marine snow Particulate flux Ross sea Sediment traps Southwest Pacific |
description |
An array of four sediment trap moorings recorded the particulate flux across the Antarctic Circumpolar Current (ACC) at 170°W, between November 1996 and January 1998, as part of the US JGOFS-Antarctic Environment and Southern Ocean Process Study (AESOPS) program. The trap locations represent sampling within the Polar Frontal Zone, the Antarctic Polar Front, the Antarctic Zone and the Southern Antarctic Zone. Here we report observations from 1000m below the sea-surface compared to seafloor and surface water distributions. Sub-sample splits from each trap were obtained and total diatom flux and species composition were determined. The diatom fluxes were quantified using both a dilution and a 'spike' method to allow for the rapid repeatability of measurements. Diatom flux was found to be highly seasonal across the ACC particularly at higher latitudes. Marine snow aggregates of intact diatom cells and chains were the major components of the biogenic flux. Siliceous particle size was noted to decrease with increasing latitude, which could be aligned with a shift of the diatom assemblage to small-size species/sea-ice affiliated species. A 'double-structured' diatom flux was recorded at the location of the Antarctic Polar Front trap, with a shift in the diatom assemblage from larger to smaller diatoms in the second flux episode. The sediment trap assemblage shows deviations from the surface water assemblage, while surface sediment samples indicate that significant dissolution occurs after 1000m and at the sediment-water interface. Estimation of diatom biovolumes across the ACC shows that large diatoms have the potential to greatly impact biogenic fluxes to the ocean interior despite their low fluxes. Small species of the genus Fragilariopsis could potentially export as much C org as Fragilariopsis kerguelensis near the retreating ice edge. However, their low abundance in the surface sediments also suggests that these diatoms are a shallow export species. |
format |
Article in Journal/Newspaper |
author |
Grigorov, Ivo Rigual-Hernandez, Andrés S. Honjo, Susumu Kemp, Alan E S Armand, Leanne K. |
author_facet |
Grigorov, Ivo Rigual-Hernandez, Andrés S. Honjo, Susumu Kemp, Alan E S Armand, Leanne K. |
author_sort |
Grigorov, Ivo |
title |
Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W |
title_short |
Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W |
title_full |
Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W |
title_fullStr |
Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W |
title_full_unstemmed |
Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W |
title_sort |
settling fluxes of diatoms to the interior of the antarctic circumpolar current along 170°w |
publishDate |
2014 |
url |
https://researchers.mq.edu.au/en/publications/733aadee-ff03-423e-a347-59fadbe4ffb1 https://doi.org/10.1016/j.dsr.2014.07.008 http://www.scopus.com/inward/record.url?scp=84905917817&partnerID=8YFLogxK |
geographic |
Antarctic Pacific Ross Sea Southern Ocean The Antarctic |
geographic_facet |
Antarctic Pacific Ross Sea Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ross Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ross Sea Sea ice Southern Ocean |
op_source |
Grigorov , I , Rigual-Hernandez , A S , Honjo , S , Kemp , A E S & Armand , L K 2014 , ' Settling fluxes of diatoms to the interior of the Antarctic circumpolar current along 170°W ' , Deep-Sea Research Part I: Oceanographic Research Papers , vol. 93 , pp. 1-13 . https://doi.org/10.1016/j.dsr.2014.07.008 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2014.07.008 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
93 |
container_start_page |
1 |
op_container_end_page |
13 |
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1802638035489128448 |