Summer Drought Patterns in the Middle-Lower Reaches of the Yangtze River Basin and Their Connections with Atmospheric Circulation before and after 1980

Figure 6

The correlation maps between PCs time series of coefficients and summer 200 hPa GPH for the periods 1961–1979 and 1980–2013. (a) PC1 for 1961–1979, (b) PC2 for 1961–1979, and (c) PC2 for 1980–2013. The shading (yellow for positive correlation and blue for negative correlation) exceeds 90% confidence level based on a two-tailed Student’s -test.

(a)

(b)

(c)