Extended Data Fig. 7: Difference between half-hourly NEE during daytime and nighttime for the period of two days before each pulse event.

Difference between half-hourly NEE during daytime and nighttime (NEE_DT - NEE_NT) for the period of two days before each pulse event. NEE_DT - NEE_NT could indicate the presence of vegetation activity before pulse events, since the more negative is NEE_DT – NEE_NT, the more likely vegetation is active (NEE_DT - NEE_NT = (R_{eco DT} – GPP) – R_{eco NT} = (R_{eco DT} – R_{eco NT}) – GPP). Assuming that R_{eco DT} – R_{eco NT} is positive since R_eco increases with temperature, then the observed negative NEE_DT - NEE_NT must be due to positive GPP. Asterisks indicate the level of one-tailed t-test significance for whether the mean of the distribution is greater than 0 (*p < 0.05, **p < 0.01, ***p < 0.001). The boxes represent interquartile range (IQR) marked with 25^th, 50^th, 75^th percentile and whiskers extending to 1.5 times the IQR.