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• W4308506776 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Coal mining accounts for ~ 12 % of the total anthropogenic methane emissions worldwide. The Upper Silesian Coal Basin, Poland, where large quantities of CH₄ are emitted to the atmosphere via ventilation shafts of underground hard coal (anthracite) mines, is one of the hot spots of methane emissions in Europe. However, coalbed CH₄ emissions into the atmosphere are poorly characterized. As part of the Carbon Dioxide and CH₄ mission 1.0 (CoMet 1.0) that took place in May – June 2018, we flew a recently developed active AirCore system aboard an unmanned aerial vehicle (UAV) to obtain CH₄ and CO₂ mole fractions 150–300 m downwind of five individual ventilation shafts in the USCB. In addition, we also measured δ¹³C-CH₄, δ²H-CH₄, ambient temperature, pressure, relative humidity, surface wind speeds and directions. We have used 34 UAV flights and two different approaches (inverse Gaussian approach and mass balance approach) to quantify the emissions from individual shafts. The quantified emissions were compared to both annual and hourly inventory data, and were used to derive the estimates of CH₄ emissions in the USCB. We found a high correlation (R² = 0.7 – 0.9) between the quantified and hourly inventory data-based shaft-averaged CH₄ emissions, which in principle would allow regional estimates of CH₄ emissions to be derived by upscaling individual hourly inventory data of all shafts. Currently, such inventory data is available only for the five shafts we quantified though. As an alternative, we have developed three upscaling approaches, i.e., by scaling the E-PRTR annual inventory, the quantified shaft-averaged emission rate, and the shaft-averaged emission rate that are derived from the hourly emission inventory. These estimates are in the range of 325 – 447 kt CH₄/year for the inverse Gaussian approach and 268 – 347 kt CH₄/year for the mass balance approach, respectively. This study shows that the UAV-based active AirCore system can be a useful tool to quantify local to regional point source methane emissions." @default.
• W4308506776 created "2022-11-12" @default.
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• W4308506776 date "2022-11-08" @default.
• W4308506776 modified "2023-10-18" @default.
• W4308506776 title "Reply on RC1" @default.
• W4308506776 doi "https://doi.org/10.5194/acp-2021-1061-ac1" @default.
• W4308506776 hasPublicationYear "2022" @default.
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