Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3211302m&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 11, CiteID L11302
Physics
9
Atmospheric Composition And Structure: Instruments And Techniques, Volcanology: Atmospheric Effects (0370), Volcanology: Volcano Monitoring (7280), Volcanology: Instruments And Techniques
Scientific paper
Ground based volcanic SO2 fluxes provide important insights into the behaviour of volcanoes, and their impacts upon the atmosphere. In order to compute a flux, the plume transport speed, and direction, must be known. In practice these are typically assumed to equal, respectively: (A) a ground based anemometer reading, and (B) the bearing of the vector between the volcanic gas source and the position on the downwind plume cross-section where the gas concentration is highest. However, use of these proxies is open to question, and they can introduce large errors (possibly > 100%), thereby significantly reducing the utility of the derived fluxes. Here we present direct spectroscopic measurements of volcanic plume velocity; the data were obtained using three ultraviolet spectrometers, at Masaya volcano, Nicaragua, during January 2004. We estimate that flux measurements with overall error budgets < 10% are readily achievable with this approach.
Fischer Tobias P.
Hilton David R.
McGonigle Andrew J. S.
Oppenheimer Clive
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