Fig. 1: Daily mean CH4 emissions have hysteretic responses to air temperature.
From: Substantial hysteresis in emergent temperature sensitivity of global wetland CH4 emissions
The quality-controlled daily air temperature (a), CH4 emissions (b), precipitation (c, left axis), and water table depth (c, right axis) measured at the Bibai Mire in Japan (JP-BBY) from 2015 to 2017. CH4 emission-air temperature dependencies (lines) derived from daily estimates (dots) recorded at JP-BBY for 2015 (d), 2016 (e), and 2017 (f). The results inferred from earlier and later parts of the frost-free season, and full frost-free season are colored in red, blue, and black, respectively. Start and end dates represent the beginning and ending of the frost-free season, respectively. Values of HA and Hμ denote the normalized area of seasonal CH4 emission hysteresis (normalized area enclosed by the blue and red lines) and the mean seasonal CH4 emission hysteresis calculated in each site-year, respectively.
