Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005gecoa..69.1861a&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 69, Issue 7, p. 1861-1871.
Physics
26
Scientific paper
We present here new measurements of sulfur dioxide and hydrogen sulfide emissions from Vulcano, Etna, and Stromboli (Italy), made by direct sampling at vents and by filter pack and ultraviolet spectroscopy in downwind plumes. Measurements at the F0 and FA fumaroles on Vulcano yielded SO2/H2S molar ratios of ≈0.38 and ≈1.4, respectively, from which we estimate an H2S flux of 6 to 9 t · d-1 for the summit crater. For Mt. Etna and Stromboli, we found SO2/H2S molar ratios of ≈20 and ≈15, respectively, which combined with SO2 flux measurements, suggest H2S emission rates of 50 to 113 t · d-1 and 4 to 8 t · d-1, respectively. We observe that “source” and plume SO2/H2S ratios at Vulcano are similar, suggesting that hydrogen sulfide is essentially inert on timescales of seconds to minutes. This finding has important implications for estimates of volcanic total sulfur budget at volcanoes since most existing measurements do not account for H2S emission.
Aiuppa Alessandro
Inguaggiato Salvatore
McGonigle Andrew J. S.
O'Dwyer Mark
Oppenheimer Clive
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