Variable SO 2 emission rates for Anatahan volcano, the Commonwealth of the Northern Mariana Islands: Implications for deriving arc‐wide volatile fluxes from erupting volcanoes
2007; American Geophysical Union; Volume: 34; Issue: 14 Linguagem: Inglês
10.1029/2007gl030405
ISSN1944-8007
AutoresD. R. Hilton, Tobias P. Fischer, A. J. S. McGonigle, J. Maarten de Moor,
Tópico(s)Atmospheric and Environmental Gas Dynamics
ResumoWe report new spectroscopic‐derived SO 2 emission rates for Anatahan volcano, Mariana Islands. Measurements of SO 2 fluxes reveal large fluctuations over the 2003–2005 period ‐ from 78 kg s −1 which occurred on the same day as resurgent volcanic activity (March, 2005) to 50 kg s −1 and 25 kg s −1 made days/weeks after the start of eruptive sequences in 2003 and 2004 respectively. Even the lowest values make Anatahan a major global source of SO 2 over the past decade. These SO 2 emission rates are used to estimate the CO 2 flux from the arc as a whole (=3.6 − 40 × 10 7 mol km −1 yr −1 ). Such values are significantly higher than estimates derived using other approaches: they are also high compared to other convergent margins (e.g., Central America) where the input flux of CO 2 is substantially greater. Our results caution against including volatile fluxes from actively‐degassing volcanoes to produce volatile outputs considered representative of entire arc fronts.
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