山西最大冻土深度时空分布特征

张小平, 秦璐, 范卫东, 李瑞芳, 田粉平

Spatial-temporal distribution characteristics of maximum frozen soil depth in Shanxi Province

ZHANG Xiaoping, QIN Lu, FAN Weidong, LI Ruifang, TIAN Fenping

图4 1960—2018年山西68站平均年最大冻土深度小波能量谱 (粗实线表示通过α=0.05显著性水平临界值,细实线表示边缘效应影响较大的区域)

Fig.4 Wavelet spectrum of average annual maximum frozen soil depth at 68 stations in Shanxi during 1960-2018 [Thick black contour designates critical value at the 0.05 significance level, and the cone of influence (COI) where edge effects might distort the picture is shown as a light contour]