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Based on NCEP/NCAR reanalysis data from 1961 to 2016, an objective identification algorithm was applied to identify the cyclones in the north of East Asia. In addition, the climate characteristics of the cyclone activity was investigated. The results show that the active areas of cyclones in the north of East Asia are mainly distributed in the 42.5-52.5°N latitudinal zone. There is an active cyclone center in the west of Mongolia and the southeastern Mongolia. Meanwhile, there are two cyclone activity centers in northeast China. The interdecadal changes of the occurrence frequency of cyclones in the north of the East Asia were significant, with relatively more cyclones from 1961 to 1978, less cyclones from 1979 to 2003, and more cyclones from 2004 to 2016. The occurrence frequency of the cyclones in the north of East Asia from 1961 to 1999 showed a significant decreasing trend and a significant increasing trend from 2000 to 2016. Morlet wavelet analysis showed that there is a significant period of 2-3 years in the occurrence frequency of cyclones in March, April, and May during the period from 1961 to 2016. The interdecadal changes of the cyclone activities may be explained by the changes of the meridional temperature gradients in different decades. Keywords—interdecadal change; cyclone activity; objective identification algorithm of cyclones; climate change; meridional temperature gradient

Interdecadal Changes of Cyclone Activities in the North of East Asia during Boreal Spring