Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7340
AuthorsSawyer, G. M.* 
Salerno, G. G.* 
Le Blond, J. S.* 
Martin, R. S.* 
Spampinato, L.* 
Roberts, T. J* 
Mather, T. A.* 
Witt, M. L. I.* 
Tsanev, V. I.* 
Oppenheimer, C.* 
TitleGas and aerosol emissions from Villarrica volcano, Chile
Issue Date2011
Series/Report no./203 (2011)
DOI10.1016/j.jvolgeores.2011.04.003
URIhttp://hdl.handle.net/2122/7340
KeywordsVillarrica
FTIR
SO2 flux
DOAS
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
AbstractHere we report results from a multidisciplinary field campaign at Villarrica volcano, Chile, in March 2009. A range of direct sampling and remote sensing techniqueswas employed to assess gas and aerosol emissions from the volcano, and extend the time series of measurements that have been made during recent years. Airborne traverses beneath the plume with an ultraviolet spectrometer yielded an average SO2 flux of 3.7 kg s−1. This value is similar to previous measurements made at Villarrica during periods of quiescent activity. The composition of the plume was measured at the crater rim using electrochemical sensors and, for the first time, open-path Fourier transforminfrared spectroscopy, yielding a composition of 90.5 mol% H2O, 5.7% CO2, 2.6%SO2, 0.9% HCl, 0.3% HF and b0.01% H2S. Comparison with previous gas measurements made between 2000 and 2004 shows a correlation between increased SO2/HCl ratios and periods of increased activity. Base-treated filter packs were also employed during our campaign, yielding molar ratios of HBr/SO2=1.1×10−4, HI/SO2=1.4×10−5 and HNO3/SO2=1.1×10−3 in the gas phase. Our data represent the most comprehensive gas inventory at Villarrica to date, and the first evaluation of HBr and HI emissions from a South American volcano. Sun photometry of the plume showed the near-source aerosol size distributions were bimodal with maxima at b0.1 and ~1 μm. These findings are consistent with results from analyses in 2003. Electron microscope analysis of particulatematter collected on filters showed an abundance of sphericalmicron-sized particles that are rich in Si, Mg and Al. Non-spherical, S-rich particles were also observed.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Sawyer et al., 2011.pdf1.65 MBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

54
checked on Apr 23, 2017

Download(s)

17
checked on Apr 23, 2017

Google ScholarTM

Check

Altmetric