Fig. 5: Estimated ΔNEE during different seasons.

Box plot of ΔNEE (between the periods 1951–1970 and 2001–2020) during different seasons for seasonally uniform warming (Annual warming), for seasonally varying warming (Seasonal warming1), for seasonally varying warming using young forests temperature sensitivities (Seasonal warming2), and for seasonally varying warming considering stand age (Seasonal warming3) (a); Stacked plot of ΔNEE during different seasons for seasonally varying warming considering stand age (b).