Quantifying and attributing methane emissions from coal mine aggregation
areas using high-frequency ground-based observations
Abstract
This work introduces the results of an intensive 15-day surface
observation campaign of methane (CH4) and adapts a new analytical method
to compute and attribute CH4 emissions. The selected area has a high
atmospheric concentration of CH4 (campaign-wide minimum/mean/standard
deviation/max observations: 2.0, 2.9, 1.3, and 16 ppm) due to a rapid
increase in the mining, production, and use of coal over the past
decade. Observations made in concentric circles at 1km, 3km, and 5km
around a high production high gas coal mine were used with the mass
conserving model free emissions estimation approach adapted to CH4,
yielding emissions of 0.73, 0.28, and 0.15 ppm/min respectively.
Attribution used a 2-box mass conserving model to identify the known
mine’s emissions from 0.042-5.3 ppm/min, and a previously unidentified
mine’s emission from 0.22-7.9 ppm/min. These results demonstrate the
importance of quantifying the spatial distribution of methane in terms
of control of regional-scale CH4 emissions.