Size-resolved chemical composition of aerosol emitted by Erebus volcano, Antarctica

Ilyinskaya, E. and Oppenheimer, C. and Mather, T. A. and Martin, R. S. and Kyle, P. R. (2010) Size-resolved chemical composition of aerosol emitted by Erebus volcano, Antarctica. Geochemistry Geophysics Geosystems, 11. p. 14. DOI 10.1029/2009GC002855

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Abstract

Persistent, open-vent degassing of Erebus volcano, Antarctica, is a significant point source of gases and aerosol to the austral polar troposphere. We report here on the chemical composition and size distribution of the Erebus aerosol, focusing on the water-soluble fraction. The aerosol was sampled at the rim of the active crater using a cascade impactor, which collected and sized particles in 14 size bins from >10 to 0.01 μm. The soluble fraction of the Erebus aerosol is distinct from other volcanic sources in several respects. It is dominated by chloride-bearing particles (over 30% of total mass) and has an unusually high Cl−/SO42− molar ratio of 3.5. Coarse particles contribute little to the total mass of the soluble fraction. Elevated concentrations of F−, Cl−, Br−, and SO42− are found in a narrow particle size fraction of 0.1–0.25 μm. The detection of particulate Br− reinforces our understanding of the potential for quiescent volcanic emissions to deplete tropospheric ozone. The small aerosol size reflects the low atmospheric temperature and humidity, which inhibit particle growth. Halide-alkali metal salts (Na, K)(Cl, F) appear to be the most abundant species in the aerosol. The concentration of Pb is high compared to other volcanoes; its exsolution may be promoted by the high abundance of halogens in Erebus magma. Despite the previously reported high NOx content in the plume, we did not detect significant quantities of nitrate in the near-vent aerosol. Our findings emphasize the potential regional significance of emissions from Erebus for understanding the Antarctic atmospheric composition and glaciochemical records.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA61;
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Journal or Publication Title: Geochemistry Geophysics Geosystems
Volume: 11
Page Range: p. 14
Identification Number: 10.1029/2009GC002855
Depositing User: Sarah Humbert
Date Deposited: 04 Nov 2010 16:41
Last Modified: 23 Jul 2013 10:00
URI: http://eprints.esc.cam.ac.uk/id/eprint/1958

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