Direct and indirect climate controls predict heterogeneous early-mid 21st century wildfire burned area across western and boreal North America
Panels show the first four principal components and percent in variation in AAB explained. Seasonal climate variables correlated with PC loadings at r ≥ 0.5 are listed including the sign of the correlation with AAB. (a) PC1, summer temperature (+) and spring precipitation (-); (b) PC2, spring temperature (+); (c) PC3, winter temperature (-); (d) PC4, preceding year summer temperature (+). Red (blue) colors indicate increases (decreases) in log-transformed AAB with increases in variables correlating positively/negatively with PC scores. Note that PC3 is inverted in sign for ease in interpretation. See S1 Fig for PC5.