《Table 1.Cyclone number, intensity and CAI values globally and for the four regions.The percentage o

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《Role of Extratropical Cyclones in the Recently Observed Increase in Poleward Moisture Transport into the Arctic Ocean》

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Measuring the number of cyclones across 55?–65?N also demonstrates a clear regional distribution（Table 1）.Annually，an average of 207 cyclones cross the latitudes of55?–65?N，of which 66（32%）cyclones are from the North Atlantic region and 57（27%）from Eurasia.North America presents the smallest number with 37（18%）cyclones，and the remaining 47（23%）are from the North Pacific.The total cyclone number across 55?–65?N demonstrates an upward trend before 1971 and a downward trend after 1971，as indicated by the change-point analysis（Fig.2）.Similar to Zhang et al.（2004），the cyclone number in the North Pacific region exhibits a downward trend throughout both periods，which helps promote Eurasia to become a bigger contributor than the North Pacific（Table 1）.In addition，Eurasia also presents the largest upward trend in cyclone number amongst all the regions for the first period.