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4 1960 - 2017年中国北方地区寒潮频次空间分布
Fig.4 Spatial distribution of cold wave frequency in northern China from 1960 - 2017