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• W3101794982 endingPage "118067" @default.
• W3101794982 startingPage "118067" @default.
• W3101794982 abstract "Recent research has used mobile methane (CH4) measurements to identify and quantify emissions, but the effect of instrument response time on concentration measurements is rarely considered. Furthermore, stable isotope ratios are increasingly used in mobile measurements to attribute sources, but the precision of mobile isotopic measurements depend on a combination of instrument and measurement conditions. Here we tested the effect of instrument speed on concentration measurements by outfitting a vehicle with isotopic and concentration-only gas analysers with different response times and conducting multiple mobile surveys. Additionally, we performed a sensitivity analysis for the isotopic precision achievable under different conditions by programming a physical model, validated with empirical data from our mobile surveys. We found that slower response time led to a greater underestimation of measured CH4 concentration, during both driving and stationary measurements, while the area under peaks in concentration is consistent and provides a robust means of comparing data between instruments. We also explore the use of an algorithm to improve instrument response. Our sensitivity analysis showed that the precision of isotopic measurements increases with the concentration range and the duration of the measurement following a power law. Our findings have important implications for the reporting and comparability of results between surveys with different instrumental setups and provide a framework for optimising sampling strategies under given objectives, conditions, and instrument capabilities." @default.
• W3101794982 created "2020-11-23" @default.
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• W3101794982 date "2021-02-01" @default.
• W3101794982 modified "2023-09-23" @default.
• W3101794982 title "Mobile methane measurements: Effects of instrument specifications on data interpretation, reproducibility, and isotopic precision" @default.
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• W3101794982 doi "https://doi.org/10.1016/j.atmosenv.2020.118067" @default.
• W3101794982 hasPublicationYear "2021" @default.
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