Fig. 2: Predominantly positive seasonal CH4 emission hysteresis inferred from ecosystem-scale measurements across the globe, i.e., CH4 emissions are generally higher later in the frost-free season at the same temperature.
From: Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions
The distribution of normalized area of seasonal CH4 emission hysteresis (HA; a, b) and mean seasonal CH4 emission hysteresis (Hμ; c, d) to air temperature among site-years derived from the FLUXNET-CH4 database. Positive seasonal CH4 emission hysteresis indicates higher CH4 emissions later in the frost-free season at the same temperature (e.g., Fig. 1d–f). Red dashed lines represent no hysteresis. The corresponding boxplot of site-year specific HA (b) and Hμ (d) derived from the FLUXNET-CH4 database. The red central mark, and the bottom and top edges of the blue box indicate the median, and the 25th and 75th percentiles, respectively. The black whiskers extend to the most extreme data points not considered outliers denoted in red plus symbol.
