High time resolution fluctuations in volcanic carbon dioxide degassing from Mount Etna

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• 作者：T.D. Pering ; G. Tamburello ; A.J.S. McGonigle ; A. Aiuppa ; A. Cannata ; G. Giudice ; D. Patan猫
• 关键词：Carbon dioxide ; Passive degassing ; Volcanic remote sensing ; Plume imaging ; Volcano seismology
• 刊名：Journal of Volcanology and Geothermal Research
• 出版年：15 January, 2014
• 年：2014
• 卷：270
• 期：Complete
• 页码：115-121
• 全文大小：1610 K

文摘

We report here on the first record of carbon dioxide gas emission rates from a volcano, captured at 鈮?#xA0;1 Hz. These data were acquired with a novel technique, based on the integration of UV camera observations (to measure SO<sub>2sub> emission rates) and field portable gas analyser readings of plume CO<sub>2sub>/SO<sub>2sub> ratios. Our measurements were performedat the North East crater of Mount Etna, southern Italy, and the data reveal strong variability in CO<sub>2sub> emissions over timescales of tens to hundreds of seconds, spanning two orders of magnitude. This carries importantimplications for attempts to constrain global volcanic CO<sub>2sub> release to the atmosphere, and will lead to an increased insight into short term CO<sub>2sub> degassing trends. A common oscillation in CO<sub>2sub> and SO<sub>2sub> emission rates in addition to the CO<sub>2sub>/SO<sub>2sub> ratios was observed at periods of 鈮?#xA0;89 s. Our results are furthermore suggestive of an intriguing temporal lag between oscillations in CO<sub>2sub> emissions and seismicity at periods of 鈮?#xA0;300-400 s, with peaks and troughs in the former series leading those in the latter by 鈮?#xA0;150 s. This work opens the way to the acquisition of further datasets with this methodology across a range of basaltic systems to better our understandingof deep magmatic processes and of degassing links to manifest geophysical signals.