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Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2022

Observational constraints on methane emissions from Polish coal mines using a ground-based remote sensing network

Andreas Luther
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Julian Kostinek
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Ralph Kleinschek
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Mila Stanisavljević
Andreas Forstmaier
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Alexandru Dandocsi
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Leon Scheidweiler
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Darko Dubravica
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Norman Wildmann
Frank Hase
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Matthias Frey
Jia Chen
Florian Dietrich
Jarosław Nȩcki
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Justyna Swolkień
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Christoph Knote
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Sanam Vardag
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Anke Roiger
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André Butz

Résumé

Given its abundant coal mining activities, the Upper Silesian Coal Basin (USCB) in southern Poland is one of the largest sources of anthropogenic methane (CH 4) emissions in Europe. Here, we report on CH 4 emission estimates for coal mine ventilation facilities in the USCB. Our estimates are driven by pairwise upwinddownwind observations of the column-average dry-air mole fractions of CH 4 (XCH 4) by a network of four portable, ground-based, sun-viewing Fourier transform spectrometers of the type EM27/SUN operated during the CoMet campaign in May-June 2018. The EM27/SUN instruments were deployed in the four cardinal directions around the USCB approximately 50 km from the center of the basin. We report on six case studies for which we inferred emissions by evaluating the mismatch between the observed downwind enhancements and simulations based on trajectory calculations releasing particles out of the ventilation shafts using the Lagrangian particle dispersion model FLEXPART. The latter was driven by wind fields calculated by WRF (Weather Research and Forecasting model) under assimilation of vertical wind profile measurements of three co-deployed wind lidars. For emission estimation, we use a Phillips-Tikhonov regularization scheme with the L-curve criterion. Diagnosed by the emissions averaging kernels, we find that, depending on the catchment area of the downwind measurements, our ad hoc network can resolve individual facilities or groups of ventilation facilities but that inspecting the emissions averaging kernels is essential to detect correlated estimates. Generally, our instantaneous emission estimates range between 80 and 133 kt CH 4 a −1 for the southeastern part of the USCB
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Dates et versions

hal-03668043 , version 1 (14-05-2022)

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Andreas Luther, Julian Kostinek, Ralph Kleinschek, Sara Defratyka, Mila Stanisavljević, et al.. Observational constraints on methane emissions from Polish coal mines using a ground-based remote sensing network. Atmospheric Chemistry and Physics, 2022, 22 (9), pp.5859 - 5876. ⟨10.5194/acp-22-5859-2022⟩. ⟨hal-03668043⟩
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