Figure 2: Multiple regression results of the statistical model of integrated phenology and physiology (SMIPP).

(a) R2 of the SMIPP. Sensitivity coefficients of annual GPP to (b) GSstart, (c) GPPmax, and (d) GSend. Latitudinal distributions of the sensitivity coefficients of annual GPP to (e) GPPmax (purple), and (f) GSstart (green) and GSend (red). Maps were generated using MATLAB 2015b (http://www.mathworks.com/products/matlab/).