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Utilize este identificador para citar ou criar um link para este item: http://acervodigital.unesp.br/handle/11449/25781
Título: 
Composition-resolved size distributions of volcanic aerosols in the Mt. Etna plumes
Autor(es): 
Instituição: 
  • Univ Cambridge
  • Univ Palermo
  • Universidade Estadual Paulista (UNESP)
  • Univ Durham
  • Univ Oxford
  • Intellect UK Ltd
  • Univ Exeter
  • Ist Nazl Geofis Vulcanol
ISSN: 
2169-897X
Resumo: 
Particle size distributions for soluble and insoluble species in Mt. Etna's summit plumes were measured across an extended size range (10 nm < d < 100 mu m) using a combination of techniques. Automated scanning electron microscopy (QEMSCAN) was used to chemically analyze many thousands of insoluble particles (collected on pumped filters) allowing the relationships between particle size, shape, and composition to be investigated. The size distribution of fine silicate particles (d < 10 mu m) was found to be lognormal, consistent with formation by bursting of gas bubbles at the surface of the magma. The compositions of fine silicate particles were found to vary between magmatic and nearly pure silica; this is consistent with depletion of metal ions by reactions in the acidic environment of the gas plume and vent. Measurements of the size, shape and composition of fine silicate particles may potentially offer insights into preemission, synemission, and postemission processes. The mass flux of fine silicate particles from Mt. Etna released during noneruptive volcanic degassing in 2004 and 2005 was estimated to be similar to 7000 kg d(-1). Analysis of particles in the range 0.1 < d/mu m < 100 by ion chromatography shows that there are persistent differences in the size distributions of sulfate aerosols between the two main summit plumes. Analysis of particles in the range 0.01 mu m < d < 0.1 mu m by scanning transmission electron microscopy (STEM) shows that there are significant levels of nanoparticles in the Mt. Etna plumes although their compositions remain uncertain.
Data de publicação: 
12-Set-2008
Citação: 
Journal of Geophysical Research-atmospheres. Washington: Amer Geophysical Union, v. 113, n. D17, p. 17, 2008.
Duração: 
17
Publicador: 
Amer Geophysical Union
Fonte: 
http://dx.doi.org/10.1029/2007JD009648
Endereço permanente: 
Direitos de acesso: 
Acesso restrito
Tipo: 
outro
Fonte completa:
http://repositorio.unesp.br/handle/11449/25781
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