Aerosol iron solubility: comparison between the Australian subtropics and Southern ocean

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dc.contributor.authorWinton, Hen_AU
dc.contributor.authorEdwards, Ren_AU
dc.contributor.authorBowie, Aen_AU
dc.contributor.authorChambers, SDen_AU
dc.contributor.authorKeywood, MDen_AU
dc.contributor.authorWerczynski, Sen_AU
dc.contributor.authorWilliams, AGen_AU
dc.date.accessioned2017-03-12T23:59:10Zen_AU
dc.date.available2017-03-12T23:59:10Zen_AU
dc.date.issued2014-11en_AU
dc.date.statistics2017-03-13en_AU
dc.description.abstractPast changes in the atmospheric deposition of soluble, or bioavailable, trace metals to high nutrient low chlorophyll (HNLC) and nitrogen replete tropical waters have been shown to modulate primary production, atmospheric CO2, and global climate. The deposition of soluble trace metals can also trigger toxic algal blooms, which impact Australia’s fisheries and coral reefs. An understanding of the sources (e.g. mineral dust and biomass emissions) and geochemistry of soluble trace metals in atmospheric aerosols is critical for determining the impact of trace metal deposition on ocean fertility in the past and the future. However, to date no trace metal solubility data exists for biomass emissions from Australian fires and there are very few estimates of soluble trace metal aerosols entering the Southern Ocean. Trace metal clean aerosols were collected during the early‐late dry season experiment at Gunn Point, Northern Territory to investigate the trace metal aerosol solubility associated with biomass burning. Previous studies have suggested that mineral dust is the dominant source of trace metal aerosol. However, mineral dust is relatively insoluble and a significant fraction of soluble trace metals in the atmosphere could originate from biomass burning rather than mineral dust. Here we use the combination of soluble aerosol chemistry, back trajectories and diurnal and advective radon components to identify trace metal source regions throughout the campaign duration. We compare aerosol iron solubility at Gunn Point in the subtropics, where biomass burning can dominate the aerosol load in the dry season, to iron solubility in baseline air at Cape Grim which is representative of the Southern Hemisphere background. In doing this we highlight the importance of aerosol source at different latitudes for the solubility and bioavailability of trace metals.en_AU
dc.identifier.booktitleAtmospheric Composition &; Chemistry Observations &; Modelling Conference incorporating the Cape Grim Annual Science Meeting 2014en_AU
dc.identifier.citationWinton, H., Edwards, G., Bowie,A., Chambers, S., Keywood, M., Werczynski, S., & Williams, A.G. (2014). Aerosol iron solubility: comparison between the Australian subtropics and Southern Ocean. Presentation to the Cape Grim Baseline Air Pollution Station Annual Scientific Meeting, Aspendale, Victoria, 12 - 14 November 2014. In: Derek, N. and P. B. Krummel (Eds). Cape Grim Baseline Air Pollution Station Annual Scientific Meeting [abstracts], Aspendale, Victoria, 12-14 November 2014. Victoria, Australia: Bureau of Meteorology and CSIRO Oceans.en_AU
dc.identifier.conferenceenddate14 November 2014en_AU
dc.identifier.conferencenameAtmospheric Composition &; Chemistry Observations &; Modelling Conference incorporating the Cape Grim Annual Science Meeting 2014en_AU
dc.identifier.conferenceplaceAspendale, Victoriaen_AU
dc.identifier.conferencestartdate12 November 2014en_AU
dc.identifier.editorsDerek, N. and P. B. Krummelen_AU
dc.identifier.govdoc8022en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/8477en_AU
dc.language.isoenen_AU
dc.publisherBureau of Meteorology and CSIRO Oceans and Atmosphere Flagshipen_AU
dc.subjectAerosolsen_AU
dc.subjectIronen_AU
dc.subjectSolubilityen_AU
dc.subjectAustraliaen_AU
dc.subjectSeasen_AU
dc.subjectBiofuelsen_AU
dc.titleAerosol iron solubility: comparison between the Australian subtropics and Southern oceanen_AU
dc.typeConference Abstracten_AU
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