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

表1 气象干旱综合指数等级划分标准

Tab.1 Classification standard of meteorological drought composite index grades

等级 类型 MCI 1 无旱 MCI>-0.5 2 轻旱 -1.0<MCI≤-0.5 3 中旱 -1.5<MCI≤-1.0 4 重旱 -2.0<MCI≤-1.5 5 特旱 MCI≤-2.0