Journal of Atmospheric Chemistry

, Volume 46, Issue 3, pp 207–237 | Cite as

Size-Resolved Characterisation of Soluble Ions in the Particles in the Tropospheric Plume of Masaya Volcano, Nicaragua: Origins and Plume Processing

  • T. A. Mather
  • A. G. Allen
  • C. Oppenheimer
  • D. M. Pyle
  • A. J. S. McGonigle

Abstract

We present the first application of a multi-stage impactor to study volcanic particle emissions to the troposphere from Masaya volcano, Nicaragua. Concentrations of soluble SO42−,Cl, F, NO3, K+, Na+,NH4+, Ca2+ and Mg2+ were determined in 11 size bins from ∼0.07 μm to >25.5 μm. The near-source size distributions showed major modes at 0.5μm (SO42−, H+,NH4+); 0.2 μm and 5.0 μm (Cl) and 2.0–5.0 μm(F). K+ and Na+ mirrored the SO42− size-resolvedconcentrations closely, suggesting that these were transported primarily asK2SO4 and Na2SO4 in acidic solution, while Mg2+ andCa2+ presented modes in both <1 μm and >1 μm particles. Changes in relative humidity were studied by comparing daytime (transparent plume) and night-time (condensed plume) results. Enhanced particle growth rates were observed in the night-time plume as well as preferential scavenging of soluble gases, such as HCl, by condensed water. Neutralisation of the acidic aerosol by background ammonia was observed at the crater rim and to a greater extent approximately 15 km downwind of the active crater. We report measurements of re-suspended near-source volcanic dust, which may form a component of the plume downwind. Elevated levels ofSO42−, Cl, F,H+, Na+, K+ and Mg2+ were observed around the 10 μm particle diameter in this dust. The volcanic SO42− flux leaving the craterwas ∼0.07 kg s−1.

aerosol diurnal impactor particles troposphere volcanic emissions 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • T. A. Mather
    • 1
  • A. G. Allen
    • 2
  • C. Oppenheimer
    • 3
  • D. M. Pyle
    • 1
  • A. J. S. McGonigle
    • 3
  1. 1.Department of Earth SciencesUniversity of CambridgeCambridgeU.K.
  2. 2.Earth and Environmental SciencesUniversity of Birmingham, School of GeographyEdgbaston, BirminghamU.K
  3. 3.Department of GeographyUniversity of CambridgeCambridgeU.K

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