Figure 9
Methane gas release power in the study area. (a) The average daily methane concentration on the surface as a function of atmospheric pressure, where the dashed line is a linear regression fit from the observed data, (b) The average daily methane concentration on the surface as a function of relative pressure, where the green dashed line represents the decomposition auxiliary line for different distribution ranges, (c) Statistical analysis of the methane concentration at different surface monitoring points in different seasons, where the box diagram represents the 25th and 75th percentiles, the red triangle represents the 99th percentile, and the gray square represents the maximum value, (d) Statistical analysis of the methane concentration at different surface monitoring points in different monthly maximum active layer thicknesses (frozen soil depth, distance from the surface to the upper limit of frozen soil); the box diagram represents the 25th and 75th percentiles, the red triangle represents the 99th percentile, and the gray square represents the maximum value.
