Climate Change Data Portal
| DOI | 10.1016/j.atmosenv.2020.118067 |
| Mobile methane measurements: Effects of instrument specifications on data interpretation, reproducibility, and isotopic precision | |
| Takriti M.; Wynn P.M.; Elias D.M.O.; Ward S.E.; Oakley S.; McNamara N.P. | |
| 发表日期 | 2021 |
| ISSN | 1352-2310 |
| 卷号 | 246 |
| 英文摘要 | 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. © 2020 Elsevier Ltd |
| 关键词 | Cavity ring-down spectroscopyFugitive emissionsGreenhouse gasesNatural gas |
| 语种 | 英语 |
| scopus关键词 | Importance sampling; Methane; Sensitivity analysis; Surveys; Concentration Measurement; Concentration ranges; Instrument response time; Isotopic measurement; Measurement conditions; Mobile measurements; Sampling strategies; Stable isotope ratios; Isotopes; methane; stable isotope; algorithm; concentration (composition); data interpretation; methane; mobile phone; numerical model; optimization; precision; sensitivity analysis; stable isotope; accuracy; cavity ring down spectroscopy; concentration (parameter); controlled study; greenhouse gas; physical model; priority journal; reaction time; reproducibility; sensitivity analysis |
| 来源期刊 | ATMOSPHERIC ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/248681 |
| 作者单位 | Lancaster Environment Centre, Lancaster University, Bailrigg, Lancaster, LA1 4YQ, United Kingdom; UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, United Kingdom |
| 推荐引用方式 GB/T 7714 | Takriti M.,Wynn P.M.,Elias D.M.O.,et al. Mobile methane measurements: Effects of instrument specifications on data interpretation, reproducibility, and isotopic precision[J],2021,246. |
| APA | Takriti M.,Wynn P.M.,Elias D.M.O.,Ward S.E.,Oakley S.,&McNamara N.P..(2021).Mobile methane measurements: Effects of instrument specifications on data interpretation, reproducibility, and isotopic precision.ATMOSPHERIC ENVIRONMENT,246. |
| MLA | Takriti M.,et al."Mobile methane measurements: Effects of instrument specifications on data interpretation, reproducibility, and isotopic precision".ATMOSPHERIC ENVIRONMENT 246(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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