Dry season aerosol iron solubility in tropical northern Australia

Winton, V. Holly L.; Edwards, Ross; Keywood, Melita; Williams, Alastair G.; Chambers, Scott D.; Selleck, Paul; Desservettaz, Maximilien; Mallet, Marc; Paton-Walsh, Clare

doi:10.5194/acp-16-12829-2016

Cited by 33 publications

(54 citation statements)

References 109 publications

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“…In this scenario, we are comparing data from the Misison Beach with results of FFeS of Australian aerosols and soils to get comparision in terms of ocean fetrilisation potential and sources. The FFeS results reported in this section are similar to data reported by Winton et al [28] for aerosols collected at a coastal site in the Northern Territory (Australia) (2%-12%) and lie in the lower range of solubilities observed in Tasmania (0.5%-56%) [29]. The labile fraction of Fe in aerosols collected at Mission Beach is similar to those reported in aerosols collected at sea during the same period (4%- Reported values for Fe solubilities around Australia are sparse and variable between sampling sites.…”

Section: Iron Solubilitysupporting

confidence: 91%

“…Elements were divided into three groups based on their median EF into (1) low, EF < 2, (2) moderate, 2 ≤ EF < 10, and (3) high, EF ≥ 10. This classification is similar to the one applied by Winton et al [28] and Buck at al. [81] for an aerosol samples origin investigation.…”

Section: Enrichment Factormentioning

confidence: 63%

“…Aerosol particulates were accumulated by pumping the air through an acid-cleaned full sheet (20 cm × 25 cm) cellulose filter (Whatman 41, W41) without a size cut-off (TSP). As a result, we directly measured concentrations of trace metals in air, and use these data to estimate trace metal deposition fluxes using the methods previously described [28,[66][67][68]. Before sampling, filters were cleaned for TM analysis according to GEOTRACES procedures [69,70].…”

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confidence: 99%

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Atmospheric Trace Metal Deposition near the Great Barrier Reef, Australia

et al. 2020

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Aerosols deposited into the Great Barrier Reef (GBR) contain iron (Fe) and other trace metals, which may act as micronutrients or as toxins to this sensitive marine ecosystem. In this paper, we quantified the atmospheric deposition of Fe and investigated aerosol sources in Mission Beach (Queensland) next to the GBR. Leaching experiments were applied to distinguish pools of Fe with regard to its solubility. The labile Fe concentration in aerosols was 2.3-10.6 ng m −3 , which is equivalent to 4.9-11.4% of total Fe and was linked to combustion and biomass burning processes, while total Fe was dominated by crustal sources. A one-day precipitation event provided more soluble iron than the average dry deposition flux, 0.165 and 0.143 µmol m −2 day −1 , respectively. Scanning Electron Microscopy indicated that alumina-silicates were the main carriers of total Fe and samples affected by combustion emissions were accompanied by regular round-shaped carbonaceous particulates. Collected aerosols contained significant amounts of Cd, Co, Cu, Mo, Mn, Pb, V, and Zn, which were mostly (47.5-96.7%) in the labile form. In this study, we provide the first field data on the atmospheric delivery of Fe and other trace metals to the GBR and propose that this is an important delivery mechanism to this region.

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Section: Iron Solubilitysupporting

confidence: 91%

Section: Enrichment Factormentioning

confidence: 63%

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confidence: 99%

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Atmospheric Trace Metal Deposition near the Great Barrier Reef, Australia

et al. 2020

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“…ATARS provides an ideal location to further investigate BB-derived fractional iron solubility at the source. The results from this study can be found in Winton et al (2016) and show that soluble iron concentrations from BB sources are significantly higher than those observed in Southern Ocean baseline air masses from the Cape Grim Baseline Air Pollution Station, Tasmania, Australia (Winton et al, 2015). Aerosol iron at SAFIRED was a mixture of fresh BB, mineral dust, sea spray and industrial pollution sources.…”

Section: Biomass Burning Aerosol Chemistrymentioning

confidence: 67%

“…Furthermore the fractional solubility of aerosol iron and other trace metals during SAFIRED were investigated in Winton et al (2016). The fractional iron solubility is an important variable determining iron availability for biological uptake in the ocean.…”

Section: Biomass Burning Aerosol Chemistrymentioning

confidence: 99%

Biomass burning emissions in north Australia during the early dry season: an overview of the 2014 SAFIRED campaign

et al. 2017

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Abstract. The SAFIRED (Savannah Fires in the Early Dry Season) campaign took place from 29 May until 30 June 2014 at the Australian Tropical Atmospheric Research Station (ATARS) in the Northern Territory, Australia. The purpose of this campaign was to investigate emissions from fires in the early dry season in northern Australia. Measurements were made of biomass burning aerosols, volatile organic compounds, polycyclic aromatic carbons, greenhouse gases, radon, speciated atmospheric mercury and trace metals. Aspects of the biomass burning aerosol emissions investigated included; emission factors of various species, physical and chemical aerosol properties, aerosol aging, micronutrient supply to the ocean, nucleation, and aerosol water uptake. Over the course of the month-long campaign, biomass burning signals were prevalent and emissions from several large single burning events were observed at ATARS.Biomass burning emissions dominated the gas and aerosol concentrations in this region. Dry season fires are extremely frequent and widespread across the northern region of Australia, which suggests that the measured aerosol and gaseous emissions at ATARS are likely representative of signals across the entire region of north Australia. Air mass forward trajectories show that these biomass burning emissions are carried north-west over the Timor Sea and could influence the atmosphere over Indonesia and the tropical atmosphere over the Indian Ocean. Here we present characteristics of the biomass burning observed at the sampling site and provide an overview of the more specific outcomes of the SAFIRED campaign.

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Health and Safety Effects of Airborne Soil Dust in the Americas and Beyond

Tong

Baklanov

Barker

et al. 2021

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Risks associated with dust hazards are often underappreciated, a gap between the knowledge pool and public awareness that can be costly for impacted communities. This study reviews the emission sources and chemical, physical, and biological characteristics of airborne soil particles (dust) and their effects on human and environmental health and safety in the Pan-American region. American dust originates from both local sources (western United States, northern Mexico, Peru, Bolivia, Chile, and Argentina) and long-range transport from Africa and Asia. Dust properties, as well as the trends and interactions with criteria air pollutants, are summarized. Human exposure to dust is associated with adverse health effects, including asthma, allergies, fungal infections, and premature death. In the Americas, a well-documented and striking effect of soil dust is its association with Coccidioidomycosis, commonly known as Valley fever, an infection caused by inhalation of soil-dwelling fungi unique to this region. Besides human health, dust affects environmental health through nutrients that increase phytoplankton biomass, contaminants that diminish water supply and affect food (crops/ fruits/vegetables and ready-to-eat meat), spread crop and marine pathogens, cause Valley fever among domestic and wild animals, transport heavy metals, radionuclides and microplastics, and reduce solar and wind power generation. Dust is also a safety hazard to road transportation and aviation, in the southwestern US where blowing dust is one of the deadliest weather hazards. To mitigate the harmful effects, coordinated regional and international efforts are needed to enhance dust observations and prediction capabilities, soil conservation measures, and Valley fever and other disease surveillance.Plain Language Summary Soil particles suspended in the air, commonly known as dust, impose substantial risks to many sectors of society, including human health, environmental health, transportation safety and the general economy. This work focuses on the dust effects in the Pan-American region, where the knowledge is rather fragmented, but impacts are costly.

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Dry season aerosol iron solubility in tropical northern Australia

Cited by 33 publications

References 109 publications

Atmospheric Trace Metal Deposition near the Great Barrier Reef, Australia

Atmospheric Trace Metal Deposition near the Great Barrier Reef, Australia

Biomass burning emissions in north Australia during the early dry season: an overview of the 2014 SAFIRED campaign

Health and Safety Effects of Airborne Soil Dust in the Americas and Beyond

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