Study on the influence of coal fire on the temporal and spatial distribution of CO and CH gas emissions.

In order to study the impact of gas released from coal fire combustion on the spatial-temporal distribution of CO and CH and other greenhouse gas emissions, the impact of regional coal fire on CO and CH emission flux was comprehensively evaluated using Landsat 8 and GOSAT satellite data in Xinjiang. In addition, typical fire areas are selected, a single-channel algorithm is used to invert the surface temperature of the coal field, the spatial distribution of the coal fire area is extracted by setting the threshold, and the influence law of CO and CH emissions in the typical fire area is accurately analyzed. The results show that during 2017-2018, CO and CH emissions in Xinjiang were generally dispersed and locally concentrated, while CO-O and CH-O were at low levels in most regions, fluctuating in the ranges of 0.01 ~ 0.14 g·m·day and 0.001 ~ 0.003 g·m·day, respectively. However, the emission intensity of CO-O and CH-O in coal fire concentrated areas is higher, which are 1.6 ~ 3.8 g·m day and 0.013 ~ 0.026 g·m·day, respectively. CO-F and CH-ag have similar laws. The fire area of Daquan Lake is scattered, and there are four areas with the surface temperature over 35 °C: A, B, C, and D, respectively. The Sandaoba fire area is more concentrated, and only two areas are E and F when the surface temperature exceeds 35 °C. CO and CH released by burning in Daquan Lake and Sandaoba fire areas increased CO-F and CH-ag by 2.08 and 0.89 times, respectively. The results provide a reference for coal fire control and carbon emission reduction.