Spatial-temporal characteristics of activity frequencies of northern cyclone and southern cyclone in East Asia
Based on the NCEP/NCAR daily reanalysis sea level pressure field data from 1953 to 2007,the spatial-temporal characteristics of activity frequencies of northern cyclones and southern cyclones in East Asia were analyzed. The results show that there are obvious inter-annual and inter-decadal variability for activity frequencies of northern cyclones and southern cyclones. With the inter-decadal climatic jump in the global scale, activity frequencies of northern cyclones have an obviously abrupt change in 1980s. The most activity frequencies of northern cyclones and southern cyclones appear in May and in August,respectively. Northern cyclones are frequent in spring and have two obviously large values centers. The centers are located in the middle of Mongolia and the north of Northeast China,respectively. Southern cyclones are frequent in summer and they are mainly located in the sea regions of the east of China and the south of Japan. The seasonal variations of activity frequencies of southern cyclones and northern cyclones are related to atmospheric circulation. The relationally analytical results of this study could provide the references for knowing well the activity rules of extratropical cyclone in East Asia and forecasting cyclone activity.
Northern cycloneSouthern cycloneActivity frequencyEast Asia region
国家科技期刊平台
NSTL
万方数据
维普
