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| Titel |
Real-time measurements of chemical and isotope composition of atmospheric and volcanic CO2 at Mt. Etna (Italy) |
| VerfasserIn |
Andrea L. Rizzo, Hans-Jürg Jost, Antonio Caracausi, Antonio Paonita, Marcello Liotta, Mauro Martelli |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096843
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| Publikation (Nr.) |
 EGU/EGU2014-12368.pdf |
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| Zusammenfassung |
| We present unprecedented data of real-time measurements of chemical and isotope (δ13C)
composition of CO2 in air and in fumarolic-plume gases collected at Mt. Etna volcano. Two
campaigns of measurements were performed on 11 July and on 5-6 September 2013, by using
a Delta Ray tunable diode laser. With the assumption of a two components mixing, a
simple linear regression was applied to the data in order to obtain the volcanogenic
δ13C.
Data acquired along the route Catania–Etna, while car was moving, showed an excess of
13C-depleted CO2 when passing through inhabited centers due to atmospheric pollution
produced by the cars exhaust. Fumaroles of Torre del Filosofo (2,900 m a.s.l.) displayed a
δ13C between -3.2±0.03oand -3.7±0.05o comparable to IRMS measurements of discrete
samples collected in the same date and in previous investigations. Diluted plume gases were
collected at more than 1 km from the craters and showed δ13C=-2.2±0.2o accordingly with
collected crater fumaroles.
Considering the huge amount of data that may be acquired in a very short time by Delta
Ray, we demonstrate that the addition to the atmospheric CO2 content of ~100 ppm of CO2
from an unknown source is enough to allow a mathematical calculation of the end-member
with an uncertainty generally < 0.15oṪhis is feasible with the assumption of a binary
mixing. We thus infer that the application performed at Mt. Etna may represent
an historical step forward for the scientific community in volcanic surveillance. |
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