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3 1960 - 2017年中国北方地区寒潮频次逐年序列及线性趋势(a)与各站点寒潮频次年际变化趋势系数显著性检验分布(b)
Fig.3 Time series and linear trend of cold wave frequency (a) and significance test distribution of annual variation trend of cold wave frequency (b) in northern China, 1960 - 2017