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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

Authors

Julien Crespin

Xavier Crosta

Aldo Shemesh

Guillaume Masse

Ruth Yam

Nadine Mattielli

Damien Cardinal



Abstract

Combined high-resolution Holocene δ30Sidiat and δ13Cdiat paleorecords are presented from theSeasonal Ice Zone, East Antarctica. Both data sets reflect periods of increased nutrient utilization by diatomsduring the Hypsithermal period (circa 7800 to 3500 calendar years (cal years) B.P.), coincident with a higherabundance 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.) isreflected by an increase in sea ice indicative species (Fragilariopsis curta and Fragilariopsis cylindrus,upto50%) along with a decrease in %BSi and δ13Cdiat(< 18‰ to 23‰). However, over this period, δ30Sidiatdata 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 ironfertilization, 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 confoundingeffect upon δ30Sidowncorecompositions of the seasonal sea ice zone. A diatom composition, with approximately28% of biogenic silica derived from the sea ice environment (diat-SI) can account for the increased averagecompo sition of δ30Sidiatduring the Neoglacial. These data highlight the significant role sea ice diatoms can playwith relation to their export in sediment records, which has implications on productivity reconstructions fromthe seasonal ice zone.

Journal Article Type Article
Publication Date May 15, 2014
Journal Paleoceanography
Print ISSN 0883-8305
Electronic ISSN 1944-9186
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 29
Issue 4
APA6 Citation Panizzo, V., Crespin, J., Crosta, X., Shemesh, A., Masse, G., Yam, R., …Cardinal, D. (2014). Sea ice diatom contributions to Holocene nutrient utilization in East Antarctica. Paleoceanography, 29(4), https://doi.org/10.1002/2014PA002609
DOI https://doi.org/10.1002/2014PA002609
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/2014PA002609/abstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information © 2014 American Geophysical Union

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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