1961—2018年四川盆地极端伏旱日数准2 a周期变化特征及其可能成因

周斌,王春学,张顺谦

Quasi-biennial Period Characteristics of Extreme Summer Drought Days and Its Possible Causes in Sichuan Basin During 1961-2018

Bin ZHOU,Chunxue WANG,Shunqian ZHANG

图7 四川盆地伏旱期间500 hPa平均位势高度场(a)及极端伏旱日数在准2 a周期上0°位相(b)和180°位相(c)重建的500 hPa高度距平场(单位:gpm) (粗黑色线为四川盆地边界,下同)

Fig.7 The average geopotential height field on 500 hPa (a) during summer drought period and 500 hPa geopotential height anomaly field reconstructed by MTM-SVD at 0° (b) and 180° (c) phase of extreme summer drought days in quasi-biennial period over Sichuan Basin (Unit: gpm) (the thick black line for the boundary of Sichuan Basin, the same as below)