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Long-term continuous monitoring of the dissolved CO2 performed by using a new device in groundwater of the Mt. Etna (southern Italy)
Author(s)
Language
English
Obiettivo Specifico
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
9/45 (2011)
Publisher
Elsevier
Pages (printed)
3005-3011
Issued date
April 2011
Abstract
We present a new device for continuous monitoring of the concentration of CO2 dissolved
in water. The device consists of a tube made of a polymeric semi-permeable membrane
connected to an infrared gas analyser (IRGA) and a pump. Several laboratory experiments
were performed to set the best operating condition and test the accuracy of measurements.
We used the device for performing 20 months of continuous monitoring of dissolved CO2
concentration (DCC) in groundwater within a drainage gallery at Mt. Etna. The monitored
groundwater intercepts the Pernicana Fault, along which degassing is observed related to
volcano-tectonic activity. The acquired data were compared with continuous and discrete
data obtained using existing methods. The measurements of DCC resulted in some period
of the year well correlated with air temperature. We also found that long-term trends, as
well as short-term variations, are probably linked to the dynamics of volcanic activity
and/or perturbations in the local or regional stress fields.
in water. The device consists of a tube made of a polymeric semi-permeable membrane
connected to an infrared gas analyser (IRGA) and a pump. Several laboratory experiments
were performed to set the best operating condition and test the accuracy of measurements.
We used the device for performing 20 months of continuous monitoring of dissolved CO2
concentration (DCC) in groundwater within a drainage gallery at Mt. Etna. The monitored
groundwater intercepts the Pernicana Fault, along which degassing is observed related to
volcano-tectonic activity. The acquired data were compared with continuous and discrete
data obtained using existing methods. The measurements of DCC resulted in some period
of the year well correlated with air temperature. We also found that long-term trends, as
well as short-term variations, are probably linked to the dynamics of volcanic activity
and/or perturbations in the local or regional stress fields.
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article
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