《Table 1.Correlation coefficients among the different DJF NPO in-dices.An asterisk indicates the cor

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《Impact of the Winter North Pacific Oscillation on the Surface Air Temperature over Eurasia and North America: Sensitivity to the Index Definition》

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The correlation coefficients among the different DJF NPO indices are shown in Table 1，all of which are significant at the 95%confidence level according to the Student’s t-test.Nevertheless，large spread exists in the correlation between different pairs of DJF NPO indices（Table 1）.In particular，the largest correlation is 0.93 between the L08 and Y11 NPO indices.This indicates that the L08 and Y11 NPO indices share about 86%of the common variance.In addition，the correlations between G04 and W81，Y11 and F12，and L08and F12，are larger than 0.9.In contrast，the correlations of the W07 NPO index with the other NPO indices are less than0.77.Specifically，the correlation coefficient is only 0.47 between the W07 NPO and Y11 NPO indices.This implies that the W07 and Y11 NPO indices only share about 22%of their common variance.