Performance of open-path GasFinder3 devices for CH4 concentration measurements close to ambient levels

Häni, Christoph; Bühler, Marcel; Neftel, Albrecht; Ammann, Christof; Kupper, Thomas (2020). Performance of open-path GasFinder3 devices for CH4 concentration measurements close to ambient levels Atmospheric Measurement Techniques Discussion, pp. 1-16. Copernicus 10.5194/amt-2020-326

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Open-path measurements of methane (CH4) with the use of GasFinder systems has been frequently used for emission estimation with the inverse dispersion method (IDM), specifically from agricultural sources. It is common to many IDM applications that the concentration enhancement related to agricultural CH4 sources is small, typically between 0.05 and 0.5 ppm, and accurate measurements of CH4 concentrations are needed at concentrations close to ambient levels. The GasFinder3-OP (GF3) device for open-path CH4 measurements is the latest version of the commercial GasFinder systems by Boreal Laser Inc. We investigated the uncertainty of six GF3 devices from side by side intercomparison measurements and comparisons to a closed-path quantum cascade laser device. Relative biases as high as 8.3 % were found and a precision between 2.1 and 10.6 ppm-m was estimated. These results deviate from the respective manufacturer specifications of 2 % and 0.5 ppm-m. Intercalibration of the GF3 devices by linear regression to remove measurement bias was shown to be of limited value due to drifts and step changes in the recorded GF3 concentrations.

Item Type:

Journal Article (Original Article)

Division/Institute:

School of Agricultural, Forest and Food Sciences HAFL
School of Agricultural, Forest and Food Sciences HAFL > Agriculture
School of Agricultural, Forest and Food Sciences HAFL > Agriculture > Sustainability and Circular Economy

Name:

Häni, Christoph0000-0003-1458-1849;
Bühler, Marcel;
Neftel, Albrecht;
Ammann, Christof and
Kupper, Thomas0000-0001-9459-1910

Subjects:

T Technology > TA Engineering (General). Civil engineering (General)

ISSN:

1867-1381

Publisher:

Copernicus

Language:

English

Submitter:

Thomas Kupper

Date Deposited:

07 Jan 2021 07:45

Last Modified:

07 Jan 2021 07:45

Publisher DOI:

10.5194/amt-2020-326

ARBOR DOI:

10.24451/arbor.14056

URI:

https://arbor.bfh.ch/id/eprint/14056

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