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

Table 1

The correlation coefficients of the first two principal components with the summer PDO and AMO for the different periods.

	PDO			AMO
	1961–2013	1961–1979	1980–2013	1961–2013	1961–1979	1980–2013
PC1	−0.27	−0.09	−0.16	−0.34	−0.33	−0.12
PC2	−0.08	−0.31	0.04	0.04	−0.14	0.10

90% confidence level; 95% confidence level.