Fig. 3: Seasonal shifts in CO2 flux dynamics.
From: Wildfires offset the increasing but spatially heterogeneous Arctic–boreal CO2 uptake
a–c, Average upscaled monthly NEE (a), GPP (b) and Reco (c) in boreal and tundra biomes during the past two decades. Negative NEE values represent net uptake, and positive values indicate net release. The central mean values in the figures are derived from the outputs of the final model using the complete training dataset. The standard deviations (error bars) are calculated from the outputs of 20 different models, each trained on a unique bootstrapped sample of the original training data. Error bars are shown only for the 2011–2020 period but are similar for the 2001–2010 period. Note that NEE was 1.4 g C m−2 month−1 lower in September in 2011–2020 than in 2001–2010 in the boreal biome, but this is not shown in the figure.
