190234.fig.002a
(a)
190234.fig.002b
(b)
190234.fig.002c
(c)
190234.fig.002d
(d)
Figure 2: Hourly mean methane concentrations at 2.4 m during winter (a), spring (b), summer (c), and fall (d) measurement periods. Bars indicate the range of concentration within ± standard deviation.