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| Titel |
A new fast-response, real-time and continuous dissolved methane sensor. |
| VerfasserIn |
Jack Triest, Jérôme Chappellaz, Roberto Grilli |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250133163
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| Publikation (Nr.) |
 EGU/EGU2016-13741.pdf |
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| Zusammenfassung |
| Continuous high resolution profiling of dissolved methane down to ocean depths is made
possible as a result of technological innovations achieved in the search for the oldest ice
in Antarctica. Testing for the SUBGLACIOR probe, which is being developed at
LGGE in response to the IPICS >1Ma old ice challenge, showed that much of the
technology to extract the trapped gases from ice can also significantly improve the
extraction and analysis of dissolved methane from the sea compared to current available
sensors.
To develop this potential, an oceanographic instrument ‘SubOcean’ was built and
deployed over a gas-hydrate zone of western Svalbard, in collaboration with CAGE, in
October 2015. Continuous measurements to depths of 400 m were made over three days
resulting in high-resolution 3D profiles. The very fast response time of the sensor
allows to display the in-situ measurements in real-time and compare them directly
to data from other instrumentation aboard the ship whilst underway. The sensor
contains a membrane based gas extraction system coupled to a laser spectrometer to
provide accurate measurements over a wide concentration range. We will present
the overall design of the instrument and highlight how it can help provide new
insights into the spatial distribution and flux of methane in the marine environment. |
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