Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 9 2006 10.5194/acp-6-2525-2006 http://www.atmos-chem-phys.net/6/2525/2006/ http://www.atmos-chem-phys.net/6/2525/2006/acp-6-2525-2006.html http://www.atmos-chem-phys.net/6/2525/2006/acp-6-2525-2006.pdf 2525 2537 2006-06-30 Atmospheric transport and deposition of Indonesian volcanic emissions M. A. Pfeffer melissa.pfeffer@zmaw.de B. Langmann H.-F. Graf Department of the Atmosphere in the Earth System, Max-Planck-Institute for Meteorology, Hamburg, Germany Department of Geography, University of Cambridge, Cambridge, UK A regional climate model has been used to study the transport and deposition of sulfur (SO₂ and SO₄^2-) and PbCl₂ emissions from Indonesian volcanoes. The sensitivity of the atmospheric loss of these trace species to meteorological conditions and their solubility was examined. Two experiments were conducted: 1) volcanic sulfur released as primarily SO₂ and subject to transport, deposition, and oxidation to SO₄^2-; and 2) PbCl₂ released as an infinitely soluble passive tracer subject to only transport and deposition. The first experiment was used to calculate SO₂ loss rates from each active Indonesian volcano producing an annual mean loss rate for all volcanoes of 1.1×10^-5 s^-1, or an e-folding rate of approximately 1 day. SO₂ loss rate was found to vary seasonally, be poorly correlated with wind speed, and uncorrelated with temperature or relative humidity. The variability of SO₂ loss rates is found to be correlated with the variability of wind speeds, suggesting that it is much more difficult to establish a "typical'' SO₂ loss rate for volcanoes that are exposed to changeable winds. Within an average distance of 70 km away from the active Indonesian volcanoes, 53% of SO₂ loss is due to conversion to SO₄^2-, 42% due to dry deposition, and 5% due to lateral transport away from the dominant direction of plume travel. The solubility of volcanic emissions in water is shown to influence their atmospheric transport and deposition. High concentrations of PbCl₂ are predicted to be deposited near to the volcanoes while volcanic S travels further away until removal from the atmosphere primarily via the wet deposition of H₂SO₄. The ratio of the concentration of PbCl₂ to SO₂ is found to exponentially decay at increasing distance from the volcanoes. The more rapid removal of highly soluble species should be considered when observing SO₂ in an aged plume and relating this concentration to other volcanic species. 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