基于SPEI和MI分析陕西省干旱特征及趋势变化

丁怡博,徐家屯,李亮,蔡焕杰,孙亚楠

Analysis of Drought Characteristics and Its Trend Change in Shaanxi Province Based on SPEI and MI

YiBo DING,JiaTun XU,Liang LI,HuanJie CAI,YaNan SUN

表2 SPEI和MI干旱等级划分

Table 2 Classification of SPEI and MI drought grades

等级 Category 类型 Type SPEI MI 1 无旱 No drought -0.5<SPEI -0.40<MI 2 轻旱 Mild drought -1.0<SPEI≤-0.5 -0.65<MI≤-0.40 3 中旱 Moderate drought -1.5<SPEI≤-1.0 -0.80<MI≤-0.65 4 重旱 Severe drought -2.0<SPEI≤-1.5 -0.95<MI≤-0.80 5 特旱 Extreme drought SPEI≤-2.0 MI≤-0.95