Figure 2: The relationship of the satellite-derived onset dates of vegetation green-up with Tmax and Tmin in the northern hemisphere during 1982–2011.
From: Leaf onset in the northern hemisphere triggered by daytime temperature
(a) The spatial pattern of the length (in months) of the preseason defined as the period with the highest negative partial correlation between VGD and averaged Tmax for the months preceding VGD. (b) The frequency distribution of the length of the preseason shown in a. (c) Partial-correlation coefficients (R) between preseason Tmax and VGD after controlling for corresponding Tmin, cloudiness and precipitation. (d) Partial-correlation coefficients (R) between Tmin and VGD during the Tmax-derived preseason after controlling for corresponding Tmax, cloudiness and precipitation. The 1% and 5% significance levels of the partial correlations correspond to ±0.49 and ±0.38, respectively.
