1960-2019年浙江省气象干旱时空演变特征研究

Temporal and Spatial Evolution Characteristics of Meteorological Drought in Zhejiang from 1960 to 2019

应用时空连续的三维干旱识别方法,完整提取浙江省1960—2019年气象干旱事件并构建三维干旱体结构,展现各年代不同等级干旱事件的三维时空分布格局与发展过程中的动态变化,进而建立6项干旱时空演变特征变量,通过克里金插值法和趋势性分析,在多年时间序列中解析浙江省干旱时空演变特征。结果表明:浙江省干旱历时不少于3个月的干旱事件有51场,夏旱和秋旱频率较高;20世纪60年代干旱强度较强,70年代以后干旱强度减弱,步入21世纪以后各等级干旱事件频发;干旱事件整体呈轻微减弱趋势,逐渐向东北方向迁移,干旱时空迁移速率整体呈上升趋势。

Using the continuous three-dimensional identification method,the meteorological drought events in Zhejiang Province from 1960 to 2019 were completely extracted and the 3D drought structure was constructed,showing the three-dimensional space-time distribution pattern of different levels of drought events in each age and the dynamic changes in the development process.Six characteristic variables of drought temporal and spatial evolution were established,and the temporal and spatial evolution characteristics of drought in Zhejiang Province were analyzed in multi-year time series through Kriging interpolation and trend analysis.The results showed that there were 51 drought events in Zhejiang Province,and the frequency of summer drought and autumn drought was high;The drought intensity was strong in the 1960s,but weakened after the 1970s.After entering the 21st century,drought events of all levels occurred frequently;the overall drought events showed a slight weakening trend,and gradually migrated to the northeast.The overall rate of temporal and spatial migration showed an upward trend.