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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/
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: | Environmental Management |
| Objective Group: | Management of Antarctic and Southern Ocean environments |
| Objective Field: | Antarctic and Southern Ocean oceanic processes |
| UTAS Author: | Bowie, AR (Professor Andrew Bowie) |
| UTAS Author: | Lannuzel, D (Associate Professor Delphine Lannuzel) |
| UTAS Author: | Remenyi, TA (Dr Tom Remenyi) |
| UTAS Author: | Boyd, PW (Professor Philip Boyd) |
| UTAS Author: | Townsend, AT (Associate Professor Ashley Townsend) |
| UTAS Author: | Trull, T (Professor Thomas Trull) |
| ID Code: | 62060 |
| Year Published: | 2009 |
| Web of Science® Times Cited: | 150 |
| 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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