Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica
Combined high-resolution Holocene δ30Sidiat and δ13Cdiat paleorecords are presented from the Seasonal Ice Zone, East Antarctica. Both data sets reflect periods of increased nutrient utilization by diatoms during the Hypsithermal period (circa 7800 to 3500 calendar years (cal years) B.P.), coincident...
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Amer Geophysical Union
2014
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ftarchimer:oai:archimer.ifremer.fr:40157 2023-05-15T13:50:50+02:00 Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica Panizzo, Virginia Crespin, Julien Crosta, Xavier Shemesh, Aldo Masse, Guillaume Yam, Ruth Mattielli, Nadine Cardinal, Damien 2014-04-22 application/pdf https://archimer.ifremer.fr/doc/00290/40157/39098.pdf https://archimer.ifremer.fr/doc/00290/40157/39099.pdf https://doi.org/10.1002/2014PA002609 https://archimer.ifremer.fr/doc/00290/40157/ eng eng Amer Geophysical Union info:eu-repo/grantAgreement/EC/FP7/294146/EU//MUSICC https://archimer.ifremer.fr/doc/00290/40157/39098.pdf https://archimer.ifremer.fr/doc/00290/40157/39099.pdf doi:10.1002/2014PA002609 https://archimer.ifremer.fr/doc/00290/40157/ 2014. American Geophysical Union. All Rights Reserved info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-04-22 , Vol. 29 , N. 4 , P. 328-342 diatoms silicon isotopes diatom bound carbon isotopes seasonal ice zone Holocene Southern Ocean text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1002/2014PA002609 2021-09-23T20:26:50Z Combined high-resolution Holocene δ30Sidiat and δ13Cdiat paleorecords are presented from the Seasonal Ice Zone, East Antarctica. Both data sets reflect periods of increased nutrient utilization by diatoms during the Hypsithermal period (circa 7800 to 3500 calendar years (cal years) B.P.), coincident with a higher abundance of open water diatom species (Fragilariopsis kerguelensis), increased biogenic silica productivity (%BSi), and higher regional summer temperatures. The Neoglacial period (after circa 3500 cal years B.P.) is reflected by an increase in sea ice indicative species (Fragilariopsis curta and Fragilariopsis cylindrus, up to 50%) along with a decrease in %BSi and δ13Cdiat (< −18‰ to −23‰). However, over this period, δ30Sidiat data show an increasing trend, to some of the highest values in the Holocene record (average of +0.43‰). Competing hypotheses are discussed to account for the decoupling trend in utilization proxies including iron fertilization, species-dependent fractionation effects, and diatom habitats. Based on mass balance calculations, we highlight that diatom species derived from the semi-enclosed sea ice environment may have a confounding effect upon δ30Sidowncore compositions of the seasonal sea ice zone. A diatom composition, with approximately 28% of biogenic silica derived from the sea ice environment (diat-SI) can account for the increased average composition of δ30Sidiat during the Neoglacial. These data highlight the significant role sea ice diatoms can play with relation to their export in sediment records, which has implications on productivity reconstructions from the seasonal ice zone. Article in Journal/Newspaper Antarc* Antarctica East Antarctica Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) East Antarctica Southern Ocean Paleoceanography 29 4 328 343 |
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 |
topic |
diatoms silicon isotopes diatom bound carbon isotopes seasonal ice zone Holocene Southern Ocean |
spellingShingle |
diatoms silicon isotopes diatom bound carbon isotopes seasonal ice zone Holocene Southern Ocean Panizzo, Virginia Crespin, Julien Crosta, Xavier Shemesh, Aldo Masse, Guillaume Yam, Ruth Mattielli, Nadine Cardinal, Damien Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica |
topic_facet |
diatoms silicon isotopes diatom bound carbon isotopes seasonal ice zone Holocene Southern Ocean |
description |
Combined high-resolution Holocene δ30Sidiat and δ13Cdiat paleorecords are presented from the Seasonal Ice Zone, East Antarctica. Both data sets reflect periods of increased nutrient utilization by diatoms during the Hypsithermal period (circa 7800 to 3500 calendar years (cal years) B.P.), coincident with a higher abundance of open water diatom species (Fragilariopsis kerguelensis), increased biogenic silica productivity (%BSi), and higher regional summer temperatures. The Neoglacial period (after circa 3500 cal years B.P.) is reflected by an increase in sea ice indicative species (Fragilariopsis curta and Fragilariopsis cylindrus, up to 50%) along with a decrease in %BSi and δ13Cdiat (< −18‰ to −23‰). However, over this period, δ30Sidiat data show an increasing trend, to some of the highest values in the Holocene record (average of +0.43‰). Competing hypotheses are discussed to account for the decoupling trend in utilization proxies including iron fertilization, species-dependent fractionation effects, and diatom habitats. Based on mass balance calculations, we highlight that diatom species derived from the semi-enclosed sea ice environment may have a confounding effect upon δ30Sidowncore compositions of the seasonal sea ice zone. A diatom composition, with approximately 28% of biogenic silica derived from the sea ice environment (diat-SI) can account for the increased average composition of δ30Sidiat during the Neoglacial. These data highlight the significant role sea ice diatoms can play with relation to their export in sediment records, which has implications on productivity reconstructions from the seasonal ice zone. |
format |
Article in Journal/Newspaper |
author |
Panizzo, Virginia Crespin, Julien Crosta, Xavier Shemesh, Aldo Masse, Guillaume Yam, Ruth Mattielli, Nadine Cardinal, Damien |
author_facet |
Panizzo, Virginia Crespin, Julien Crosta, Xavier Shemesh, Aldo Masse, Guillaume Yam, Ruth Mattielli, Nadine Cardinal, Damien |
author_sort |
Panizzo, Virginia |
title |
Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica |
title_short |
Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica |
title_full |
Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica |
title_fullStr |
Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica |
title_full_unstemmed |
Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica |
title_sort |
sea ice diatom contributions to holocene nutrient utilization in east antarctica |
publisher |
Amer Geophysical Union |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00290/40157/39098.pdf https://archimer.ifremer.fr/doc/00290/40157/39099.pdf https://doi.org/10.1002/2014PA002609 https://archimer.ifremer.fr/doc/00290/40157/ |
geographic |
East Antarctica Southern Ocean |
geographic_facet |
East Antarctica Southern Ocean |
genre |
Antarc* Antarctica East Antarctica Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctica East Antarctica Sea ice Southern Ocean |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2014-04-22 , Vol. 29 , N. 4 , P. 328-342 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/294146/EU//MUSICC https://archimer.ifremer.fr/doc/00290/40157/39098.pdf https://archimer.ifremer.fr/doc/00290/40157/39099.pdf doi:10.1002/2014PA002609 https://archimer.ifremer.fr/doc/00290/40157/ |
op_rights |
2014. American Geophysical Union. All Rights Reserved info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2014PA002609 |
container_title |
Paleoceanography |
container_volume |
29 |
container_issue |
4 |
container_start_page |
328 |
op_container_end_page |
343 |
_version_ |
1766254144879853568 |