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| Titel |
Intercomparison of eight state-of-the-art eddy covariance methane gas analysers |
| VerfasserIn |
Olli Peltola, Arjan Hensen, Carole Helfter, Luca Belelli Marchesini, Ivan Mammarella, Sami Haapanala, Jutta Holst, Jan Elbers, Fred Bosveld, Pim van den Bulk, Thomas Röckmann, Anders Lindroth, Tuomas Laurila, Alex Vermeulen, Eiko Nemitz |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080920
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| Zusammenfassung |
| During the last decade several gas analysers became available that are capable of measuring
methane concentration with high sampling frequency needed for eddy covariance
measurements. These new gas analysers require less maintenance compared with the models
used in the 1990’s and they give more reliable estimates for the ecosystem scale methane
fluxes. However, with different instrument types available now, their performance should be
crosscompared and validated.
A gas analyser intercomparison campaign was held at Cabauw measurement station in the
Netherlands between 6th and 27th of June, 2012. The campaign was organized
within the InGOS FP7 project. Cabauw is well-established site with a long history in
greenhouse gas monitoring and the surrounding landscape is a considerable source
of methane. In total eight methane gas analysers manufactured by Picarro Inc.,
Los Gatos Research, Aerodyne Research Inc. and LI-COR Inc. were used in the
experiment.
Tentative results show relatively good agreement between the eight methane flux
estimates and they also agree with previous studies done at the site. Magnitude and variation
of the flux estimates are similar. Cumulative methane emissions calculated from not gapfilled
data during a 10 day episode agree within 10 %, values ranging from 190 mg(CH4) m-2 to
210 mg(CH4) m-2. Comparison of random errors of the measured methane fluxes did not
reveal any big differences between the instruments. Some of the gas analysers measuring
methane were also capable of measuring water vapour at the same time. This is a big
asset during data processing, since effect of water vapour on methane concentration
measurement can then be easily corrected without need of additional water vapour
measurement. The presentation will discuss the intercomparison campaign setup,
instrument performance and will provide recommendations for CH4-EC measurements. |
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