Evaluating the performance of commonly used gas analysers for methane eddy covariance flux measurements: the InGOS inter-comparison field experiment

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dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor University of Helsinki, Department of Physics en
dc.contributor.author Peltola, Olli
dc.contributor.author Hensen, Arjan
dc.contributor.author Helfter, Carole
dc.contributor.author Belelli Marchesini, Luca
dc.contributor.author Bosveld, Fred
dc.contributor.author van den Bulk, Pim
dc.contributor.author Elbers, Jan
dc.contributor.author Haapanala, Sami
dc.contributor.author Holst, Jutta
dc.contributor.author Laurila, Tuomas
dc.contributor.author Lindroth, Anders
dc.contributor.author Nemitz, Eiko
dc.contributor.author Röckmann, Thomas
dc.contributor.author Vermeulen, Alex
dc.contributor.author Mammarella, Ivan
dc.date.accessioned 2016-05-18T12:36:01Z
dc.date.available 2016-05-18T12:36:01Z
dc.date.issued 2014
dc.identifier.citation Peltola , O , Hensen , A , Helfter , C , Belelli Marchesini , L , Bosveld , F , van den Bulk , P , Elbers , J , Haapanala , S , Holst , J , Laurila , T , Lindroth , A , Nemitz , E , Röckmann , T , Vermeulen , A & Mammarella , I 2014 , ' Evaluating the performance of commonly used gas analysers for methane eddy covariance flux measurements: the InGOS inter-comparison field experiment ' , Biogeosciences , vol. 11 , pp. 3163-3186 . https://doi.org/10.5194/bg-11-3163-2014 en
dc.identifier.issn 1726-4170
dc.identifier.other PURE: 40340650
dc.identifier.other PURE UUID: ecdbacd5-fc28-4c0c-812b-3de736df5732
dc.identifier.other WOS: 000338761200006
dc.identifier.other Scopus: 84902675084
dc.identifier.other ORCID: /0000-0002-8516-3356/work/30622634
dc.identifier.other ORCID: /0000-0002-1744-6290/work/29916903
dc.identifier.uri http://hdl.handle.net/10138/162371
dc.description.abstract The performance of eight fast-response methane (CH4) gas analysers suitable for eddy covariance flux measurements were tested at a grassland site near the Cabauw tall tower (Netherlands) during June 2012. The instruments were positioned close to each other in order to minimise the effect of varying turbulent conditions. The moderate CH4 fluxes observed at the location, of the order of 25 nmol m−2 s−1, provided a suitable signal for testing the instruments' performance. Generally, all analysers tested were able to quantify the concentration fluctuations at the frequency range relevant for turbulent exchange and were able to deliver high-quality data. The tested cavity ringdown spectrometer (CRDS) instruments from Picarro, models G2311-f and G1301-f, were superior to other CH4 analysers with respect to instrumental noise. As an open-path instrument susceptible to the effects of rain, the LI-COR LI-7700 achieved lower data coverage and also required larger density corrections; however, the system is especially useful for remote sites that are restricted in power availability. In this study the open-path LI-7700 results were compromised due to a data acquisition problem in our data-logging setup. Some of the older closed-path analysers tested do not measure H2O concentrations alongside CH4 (i.e. FMA1 and DLT-100 by Los Gatos Research) and this complicates data processing since the required corrections for dilution and spectroscopic interactions have to be based on external information. To overcome this issue, we used H2O mole fractions measured by other gas analysers, adjusted them with different methods and then applied them to correct the CH4 fluxes. Following this procedure we estimated a bias of the order of 0.1 g (CH4) m−2 (8% of the measured mean flux) in the processed and corrected CH4 fluxes on a monthly scale due to missing H2O concentration measurements. Finally, cumulative CH4 fluxes over 14 days from three closed-path gas analysers, G2311-f (Picarro Inc.), FGGA (Los Gatos Research) and FMA2 (Los Gatos Research), which were measuring H2O concentrations in addition to CH4, agreed within 3% (355–367 mg (CH4) m−2) and were not clearly different from each other, whereas the other instruments derived total fluxes which showed small but distinct differences (±10%, 330–399 mg (CH4) m−2). en
dc.format.extent 24
dc.language.iso eng
dc.relation.ispartof Biogeosciences
dc.rights en
dc.subject 114 Physical sciences en
dc.title Evaluating the performance of commonly used gas analysers for methane eddy covariance flux measurements: the InGOS inter-comparison field experiment en
dc.type Article
dc.description.version Peer reviewed
dc.identifier.doi https://doi.org/10.5194/bg-11-3163-2014
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/publishedVersion
dc.contributor.pbl
dc.contributor.pbl

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