Fig. 2: Trends in CO2 budgets.
From: Wildfires offset the increasing but spatially heterogeneous Arctic–boreal CO2 uptake
a,b, Terrestrial CO2 budgets for 1-km (blue; 2001–2020) and 8-km (grey; 1990–2016) NEE as well as 1-km NEE + fire emissions (red; 2002–2020) across the ABZ (a) and the permafrost region (b). c, An overlay analysis of NEE, GPP and Reco trend maps identifying how trends in GPP and Reco relate to trends in NEE over 2001–2020 (includes significant and non-significant trends). d, Pixels burned during 2002–2020. The central values (that is, annual budgets; solid lines) in a and b are derived from the outputs of the final model using the complete training dataset. The standard deviations (shaded areas) are calculated from the outputs of 20 different models, each trained on a unique bootstrapped sample of the original training data. The magnitude of each trend was computed using the Theil–Sen approach, and the P value determined using the Mann–Kendall test.
