Extended Data Fig. 3: Globally identified climate response groups are maintained at regional level.

Left panels: Spatial distribution for climate response groups in well-represented sections of the network: North America (n = 119), High-mountain Asia (n = 92) and South America (n = 65). In North America, climate response groups are geographically segregated and the ‘Strong positive PP response’ and ‘Positive PP response’ groups are characterized by the lowest water availability (MAP; Extended Data Table 3). Furthermore, these climate response groups differ in PP variability, whereas the groups with the weakest (positive and negative) precipitation responses differ in PP seasonality. High-mountain Asia and South America portions of the network are dominated by climate response groups with weak (positive and negative) precipitation response. As in the full network, these groups do not differ in PP variability (Extended Data Table 3). Right panels: Responses of ring-width index (RWI) to interannual variation in monthly T_max (red) and PP (blue) of four climate response groups. Correlation coefficients (Pearson r, mean and 95% confidence intervals) are shown for a 24-month period including the year prior to ring formation and that of ring formation. Elevation data for left panels from open source data: ETOPO5, NOAA (https://www.ngdc.noaa.gov/mgg/global/etopo5.HTML).