Journal
BIOGEOSCIENCES
Volume 17, Issue 13, Pages 3659-3667Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-17-3659-2020
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Funding
- European Research Council (ERC) under the European Union [725546]
- Swedish Research Council VR [2016-04829]
- FORMAS [2018-01794]
- Formas [2018-01794] Funding Source: Formas
- Swedish Research Council [2016-04829] Funding Source: Swedish Research Council
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A major bottleneck regarding the efforts to better quantify greenhouse gas fluxes, map sources and sinks, and understand flux regulation is the shortage of low-cost and accurate-enough measurement methods. The studies of methane (CH4) - a long-lived greenhouse gas increasing rapidly but irregularly in the atmosphere for unclear reasons, and with poorly understood source-sink attribution - suffer from such method limitations. This study presents new calibration and data processing approaches for use of a low-cost CH4 sensor in flux chambers. Results show that the change in relative CH4 levels can be determined at rather high accuracy in the 2-700 ppm mole fraction range, with modest efforts of collecting reference samples in situ and without continuous access to expensive reference instruments. This opens possibilities for more affordable and time-effective measurements of CH4 in flux chambers. To facilitate such measurements, we also provide a description for building and using an Arduino logger for CH4, carbon dioxide (CO2), relative humidity, and temperature.
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