结果表明：春季北方气旋活动频繁，存在明显的两个高值中心，分别位于蒙古国的中部和我国东北北部地区。
Results show that in spring Northern Cyclones have high frequencies and there are two distinct high value centers: one locates in the middle of Mongolia; the other in the north of northeast China.
基于ECMWF再分析资料和中国地面观测资料，分析了1979 ~ 2001年春季蒙古气旋对同期中国北方沙尘暴的影响。
Based on the ECMWF reanalysis data and surface observation data of dust storms in China in 1979 ~ 2001, impact of Mongolian Cyclone on dust storms over Northern China in spring have been researched.
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