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Biogeochemical iron budgets of the Southern Ocean south of Australia: Decoupling of iron and nutrient cycles in the subantarctic zone by the summertime supply

Citation

Bowie, AR and Lannuzel, D and Remenyi, TA and Wagener, T and Lam, PJ and Boyd, PW and Guieu, C and Townsend, AT and Trull, T, Biogeochemical iron budgets of the Southern Ocean south of Australia: Decoupling of iron and nutrient cycles in the subantarctic zone by the summertime supply, Global Biogeochemical Cycles, 23, (4) Article GB4034. ISSN 0886-6236 (2009) [Refereed Article]


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Copyright Statement

Copyright © 2009 American Geophysical Union

Official URL: http://www.agu.org/

DOI: doi:10.1029/2009GB003500

Abstract

Climate change is projected to significantly alter the delivery (stratification, boundary currents, aridification of landmasses, glacial melt) of iron to the Southern Ocean. We report the most comprehensive suite of biogeochemical iron budgets to date for three contrasting sites in subantarctic and polar frontal waters south of Australia. Distinct regional environments were responsible for differences in the mode and strength of iron supply mechanisms, with higher iron stocks and fluxes observed in surface northern subantarctic waters, where atmospheric iron fluxes were greater. Subsurface waters southeast of Tasmania were also enriched with particulate iron, manganese and aluminum, indicative of a strong advective source from shelf sediments. Subantarctic phytoplankton blooms are thus driven by both seasonal iron supply from southward advection of subtropical waters and by wind-blown dust deposition, resulting in a strong decoupling of iron and nutrient cycles. We discuss the broader global significance our iron budgets for other ocean regions sensitive to climate-driven changes in iron supply.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Antarctic and Sub-Antarctic Oceanography
Author:Bowie, AR (Associate Professor Andrew Bowie)
Author:Lannuzel, D (Dr Delphine Lannuzel)
Author:Remenyi, TA (Dr Tom Remenyi)
Author:Boyd, PW (Professor Philip Boyd)
Author:Townsend, AT (Associate Professor Ashley Townsend)
Author:Trull, T (Professor Thomas Trull)
ID Code:62060
Year Published:2009
Web of Science® Times Cited:86
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2010-03-09
Last Modified:2014-10-14
Downloads:4 View Download Statistics

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