Biogeochemical iron budgets of the Southern Ocean south of Australia

Decoupling of iron and nutrient cycles in the subantarctic zone by the summertime supply

Andrew R. Bowie, Delphine Lannuzel, Tomas A. Remenyi, Thibaut Wagener, Phoebe J. Lam, Philip W. Boyd, Cecile Guieu, Ashley T. Townsend, Thomas W. Trull

    Research output: Contribution to journalArticle

    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.

    Original languageEnglish (US)
    Article numberGB4034
    JournalGlobal Biogeochemical Cycles
    Volume23
    Issue number4
    DOIs
    StatePublished - Oct 1 2009

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    Nutrients
    Iron
    iron
    ocean
    Water
    Climate change
    nutrient cycle
    budget
    Fluxes
    aridification
    boundary current
    water
    shelf sediment
    Phytoplankton
    Advection
    Manganese
    Aluminum
    Dust
    manganese
    Sediments

    ASJC Scopus subject areas

    • Global and Planetary Change
    • Environmental Chemistry
    • Environmental Science(all)
    • Atmospheric Science

    Cite this

    Biogeochemical iron budgets of the Southern Ocean south of Australia : Decoupling of iron and nutrient cycles in the subantarctic zone by the summertime supply. / Bowie, Andrew R.; Lannuzel, Delphine; Remenyi, Tomas A.; Wagener, Thibaut; Lam, Phoebe J.; Boyd, Philip W.; Guieu, Cecile; Townsend, Ashley T.; Trull, Thomas W.

    In: Global Biogeochemical Cycles, Vol. 23, No. 4, GB4034, 01.10.2009.

    Research output: Contribution to journalArticle

    Bowie, Andrew R. ; Lannuzel, Delphine ; Remenyi, Tomas A. ; Wagener, Thibaut ; Lam, Phoebe J. ; Boyd, Philip W. ; Guieu, Cecile ; Townsend, Ashley T. ; Trull, Thomas W. / Biogeochemical iron budgets of the Southern Ocean south of Australia : Decoupling of iron and nutrient cycles in the subantarctic zone by the summertime supply. In: Global Biogeochemical Cycles. 2009 ; Vol. 23, No. 4.
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    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.",
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    AU - Remenyi, Tomas A.

    AU - Wagener, Thibaut

    AU - Lam, Phoebe J.

    AU - Boyd, Philip W.

    AU - Guieu, Cecile

    AU - Townsend, Ashley T.

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