Skip to Content | Contact

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

Authors

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

Abstract

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.

Latest news

  • Conference prize winners
    27 Jun 2013

    The Strategic Science in Antarctica conference concluded yesterday and two days of workshops have commenced. Congratulations to those who were awarded prizes for their contributions to the conference.

  • Watch the welcome message from Australia's Environment Minister
    24 Jun 2013

    In a welcome message via video from Canberra, Australia’s Environment Minister, Tony Burke, reflected on the foresight of earlier decision-makers who agreed to set aside an entire continent for scientific research.

  • Last minute information for attendees
    20 Jun 2013

    There's not too long to wait until the start of the Strategic Science in Antarctica conference, and we hope you’re as excited as we are! Read on for more information about the final program, registration, Twitter, presenters, posters and social functions.

More news…

Key dates

  • 11th June 2013
    Registrations close
  • 21st June 2013
    Registrations at the AAD open for staff
  • 24th June 2013
    Registrations at the venue open
  • 24th June 2013
    Conference commences
  • 26th June 2013
    Conference concludes

More key dates…

This page was last modified on 24 September 2013.