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Spectrometric imaging of sub-hourly methane emission dynamics from coal mine ventilation
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Spectrometric imaging of sub-hourly methane emission dynamics from coal mine ventilation
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Spectrometric imaging of sub-hourly methane emission dynamics from coal mine ventilation
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Journal Article
Spectrometric imaging of sub-hourly methane emission dynamics from coal mine ventilation
2023
Overview
Anthropogenic methane (CH 4 ) emissions contribute significantly to the current radiative forcing driving climate change. Localized CH 4 sources such as occurring in the fossil fuel industry contribute a substantial share to the anthropogenic emission total. The temporal dynamics of such emissions is largely unresolved and unaccounted for when using atmospheric measurements by satellites, aircraft, and ground-based instruments to monitor emission rates and verify reported numbers. Here, we demonstrate the usage of a ground-based imaging spectrometer for quantifying the CH 4 emission dynamics of a ventilation facility of a coal mine in the Upper Silesian Coal Basin, Poland. To this end, we deployed the imaging spectrometer at roughly 1 km distance from the facility and collected plume images of CH 4 column enhancements during the sunlit hours of four consecutive days in June 2022. Together with wind information from a co-deployed wind-lidar, we inferred CH 4 emission rates with roughly 1 min resolution. Daily average emission rates ranged between 1.39 ± 0.19 and 4.44 ± 0.76 tCH 4 h −1 , 10 min averages ranged between (min) 0.82 and (max) 5.83 tCH 4 h −1 , and puff-like events caused large variability on time scales below 15 min. Thus, to monitor CH 4 emissions from such sources, it requires measurement techniques such as the imaging spectrometer evaluated here that can capture emission dynamics on short time scales.
