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Quantifying export production in the Southern Ocean: Implications for the Baxsproxy

Record type: Article

The water column and sedimentary Baxs distribution around the Crozet Plateau is used to decipher the controls and timing of barite formation and to evaluate how export production signals are recorded in sediments underlying a region of natural Fe fertilization within the Fe limited Southern Ocean. Export production estimated from preserved, vertical sedimentary Baxs accumulation rates are compared with published export fluxes assessed from an integrated study of the biological carbon pump to determine the validity of Baxs as a quantitative proxy under different Fe supply conditions typical of the Southern Ocean. Detailed assessment of the geochemical partitioning of Ba in sediments and the lithogenic end-member allows appropriate correction of the bulk Ba content and determination of the Baxs content of sediments and suspended particles. The upper water column distribution of Baxs is extremely heterogeneous spatially and temporally. Organic carbon/Baxs ratios in deep traps from the Fe fertilized region are similar to other oceanic settings allowing quantification of the inferred carbon export based on established algorithms. There appears to be some decoupling of POC and Ba export in the Fe limited region south of the Plateau. The export production across the Crozet Plateau inferred from the Baxs sedimentary proxy indicates that the Fe fertilized area to the north of the Plateau experiences enhanced export relative to equivalent Southern Ocean settings throughout the Holocene and that this influence may also have impacted the site to the south for significant periods. This interpretation is corroborated by alternative productivity proxies (opal accumulation, 231Paxs/230Thxs). Baxs can be used to quantify export production in complex settings such as naturally Fe-fertilized (volcanoclastic) areas, providing appropriate lithogenic correction is undertaken, and sediment focusing is corrected for along with evaluation of barite preservation.

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Citation

Hernandez-Sanchez, Maria T., Mills, Rachel A., Planquette, Hélène, Pancost, Richard D., Hepburn, Laura, Salter, Ian and FitzGeorge-Balfour, Tania (2011) Quantifying export production in the Southern Ocean: Implications for the Baxsproxy Paleoceanography, 26, (4), PA4222. (doi:10.1029/2010PA002111).

More information

Published date: 2011
Organisations: Geochemistry, Marine Biogeochemistry, Marine Geoscience

Identifiers

Local EPrints ID: 208511
URI: http://eprints.soton.ac.uk/id/eprint/208511
ISSN: 0883-8305
PURE UUID: a548ecd3-972c-4707-a38b-fed4b81cd5c3
ORCID for Rachel A. Mills: ORCID iD orcid.org/0000-0002-9811-246X

Catalogue record

Date deposited: 19 Jan 2012 14:37
Last modified: 18 Jul 2017 10:48

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Contributors

Author: Maria T. Hernandez-Sanchez
Author: Rachel A. Mills ORCID iD
Author: Hélène Planquette
Author: Richard D. Pancost
Author: Laura Hepburn
Author: Ian Salter
Author: Tania FitzGeorge-Balfour

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