《Table 1.Classification of weak and strong AL years in AMO|+and AMO|-.》

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《Modulation of the Aleutian–Icelandic Low Seesaw and Its Surface Impacts by the Atlantic Multidecadal Oscillation》

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The AL and IL indices are defined as the average anomalies of SLP over（50?–60?N，185?–215?E）and（55?–65?N，315?–345?E），respectively（Orsolini et al.，2008；derived from Had SLP2r）.The AIS index is the difference between the normalized AL and IL indices.A positive value of the AL（AIS）index corresponds to a weak AL（a weak AL and a stronger IL）.The AIS index used here differs slightly from the one defined by Honda et al.（2005b）.The main difference is the geographical sector used for the AL definition，which in our case is situated farther north，in the region of strongest SLP variance in February.The correlation coefficient between the AIS index used here and that used by Honda et al.（2005b）is 0.94（over the 99%confidence level）（Fig.S1） .The smoothed AMO index is based upon the average SST anomaly（SSTA）in the North Atlantic basin（0?–70?N）during 1861–2011（available at https://www.esrl.noaa.gov/psd/data/timeseries/AMO/）.Weak（strong）AL years are determined when the normalized AL index is above（below）a standard deviation from the mean of 0.8（-0.8）.The AMO|+and AMO|-phases correspond to cases in which the smoothed AMO index is above and below zero，respectively.The classification of weak and strong AL years according to the different phases of the AMO，used for the composite analysis，is shown in Table 1.