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Seasonality of soluble iron and black carbon in the Ross Sea and Southern Ocean

Seasonality of soluble iron and black carbon in the Ross Sea and Southern Ocean
Holly Winton


Holly Winton
Curtin University, GPO Box U1987, Perth, WA

Ross Edwards
Curtin University, GPO Box U1987, Perth, WA

Andrew Bowie
University of Tasmania, Private Bag 80, Hobart, TAS


Past changes in the atmospheric deposition of soluble iron (Fe) to high nutrient low chlorophyll (HNLC) and tropical waters may have stimulated primary production, drawing down atmospheric CO2 and thus initiating changes in global climate. An understanding of the sources (e.g. mineral dust, biomass emissions, fuel combustion, extra-terrestrial dust) and geochemistry of soluble Fe in atmospheric aerosols is critical for determining the impact of Fe deposition on ocean fertility in the past and the future. However, to date no Fe solubility data exists for biomass emissions from Australian fires and there are few estimates of soluble Fe aerosols entering the Southern Ocean. Here we present two seasonally resolved short records of soluble Fe concentrations. The first record is derived from aerosols transported from the Southern Ocean and collected at Cape Grim Baseline Air Pollution Station, northwest Tasmania. Soluble Fe was investigated by a sequential step-wise leaching protocol whereby the water soluble, liable particulate and total fractions of Fe are leached from the aerosols. The second record of soluble Fe is derived from a snow pit on Roosevelt Island, Ross Sea. Seasonal variability in soluble Fe concentrations is attributed to changes in the source e.g. dust and biomass emissions.

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This page was last modified on 24 September 2013.