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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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/206488 2023-08-27T04:05:10+02:00 Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica Panizzo, Virginia Crespin, Julien CRosta, Xavier Shemesh, Aldo Massé, Guillaume Yam, Ruth Mattielli, Nadine Cardinal, D. 2014-04 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/206488 https://dipot.ulb.ac.be/dspace/bitstream/2013/206488/3/206488.pdf en eng uri/info:doi/10.1002/2014PA002609 https://dipot.ulb.ac.be/dspace/bitstream/2013/206488/3/206488.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/206488 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Paleoceanography, 29 (4 Géochimie Océanographie physique et chimique info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2014 ftunivbruxelles 2023-08-09T22:23:11Z 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. FLWIN info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctica East Antarctica Sea ice DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) East Antarctica |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Géochimie Océanographie physique et chimique |
spellingShingle |
Géochimie Océanographie physique et chimique Panizzo, Virginia Crespin, Julien CRosta, Xavier Shemesh, Aldo Massé, Guillaume Yam, Ruth Mattielli, Nadine Cardinal, D. Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica |
topic_facet |
Géochimie Océanographie physique et chimique |
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. FLWIN info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Panizzo, Virginia Crespin, Julien CRosta, Xavier Shemesh, Aldo Massé, Guillaume Yam, Ruth Mattielli, Nadine Cardinal, D. |
author_facet |
Panizzo, Virginia Crespin, Julien CRosta, Xavier Shemesh, Aldo Massé, Guillaume Yam, Ruth Mattielli, Nadine Cardinal, D. |
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 |
publishDate |
2014 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/206488 https://dipot.ulb.ac.be/dspace/bitstream/2013/206488/3/206488.pdf |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica East Antarctica Sea ice |
genre_facet |
Antarc* Antarctica East Antarctica Sea ice |
op_source |
Paleoceanography, 29 (4 |
op_relation |
uri/info:doi/10.1002/2014PA002609 https://dipot.ulb.ac.be/dspace/bitstream/2013/206488/3/206488.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/206488 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1775356543532793856 |