中国北方地区寒潮时空特征及其成因分析
乔雪梅, 刘普幸

The temporal and spatial characteristics and genesis of cold wave in northern China
Xuemei QIAO, Puxing LIU
图2 近58年中国北方地区四种类型寒潮发生频次空间分布
Fig.2 Spatial distribution of the four kinds of cold wave frequencies over northern China, 1960 - 2017