《Table 1.Correlation coefficients between the PCs and moisture incomes across the four boundaries of

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《Variation in Principal Modes of Midsummer Precipitation over Northeast China and Its Associated Atmospheric Circulation》

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The north mode corresponds to negative zonal wind anomalies along where the climatological EAJ lies（Fig.7b）.This suggests that the north mode may be associated with the intensity of the EAJ.We define an EAJ intensity index by averaging the zonal wind within the region（35?–45?N110?–140?E），which is also similar to the approach of Chen et al.（2016）but with an averaging region nearer to NEC.The correlation coefficient of the EAJ intensity index and PC2 is-0.40，suggesting that a positive/negative north pattern is as sociated with a weakened/strengthened EAJ.The anomalous easterly at the southern flank of the anticyclone centered ove northern NEC may account for the negative correlation be tween the EAJ intensity and the north mode（Fig.2b）.