人民长江2023，Vol.54Issue(12)：89-95,7.DOI:10.16232/j.cnki.1001-4179.2023.12.012
松花江流域干旱突变特征及其遥相关因子分析
Analysis on drought mutation characteristic and its teleconnection factors in Songhua River Basin
摘要
Abstract
In order to explore the time-domain mutation characteristics and evolutionary mechanisms of drought events in the Songhua River Basin,the standardized precipitation evapotranspiration index at the12-month scale(SPEI-12)was calculated based on the precipitation and temperature data from meteorological stations in the Songhua River Basin during 1960～2020.The mutation of the SPEI-12 sequence was identified to explore the inter-annual mutation and underlying causes of drought events in the Songhua River Basin.By means of cross-wavelet transform,wavelet-coherence analysis,and lag-correlation analyses,this paper analyzed the spatiotemporal characteristics of SPEI-12 before and after the mutation and revealed the response of SPEI-12 index to the teleconnection factor.Results revealed that the mutation of SPEI-12 occurred around1984,and SPEI-12 ten-ded to decrease in the basin generally.The decreasing trend was more evident in the southeast of Hulun Buir City,the northwest of Qiqihar City,surrounding Heihe City,and the northern part of Jilin City than other regions.There was a resonance period between SPEI-12 and Pacific Decadal Oscillation(PDO)and El Niño-Southern Oscillation(ENSO),indicating that PDO and ENSO significantly interacted with SPEI-12 after the mutation.The lag-correlation characteristics between SPEI-12 and the two tele-connection indices significantly changed.After the mutation,the SPEI-12 and PDO showed a 1～12 months lag significant posi-tively,and 6～8 months lag significant positively for ENSO.The analysis indicates that PDO and ENSO are critical to the mutation of drought characteristics in the Songhua River Basin.关键词
气象干旱/遥相关因子/SPEI/突变检验/松花江流域Key words
meteorological drought/teleconnection factor/SPEI/mutation test/Songhua River Basin分类
建筑与水利引用本文复制引用
曹青,刘康龙,郝振纯..松花江流域干旱突变特征及其遥相关因子分析[J].人民长江,2023,54(12):89-95,7.基金项目
国家自然科学基金青年科学基金项目(42201025) （42201025）
江苏省高等学校基础科学(自然科学)研究项目(21KJB570012) （自然科学）
水利部水文气象灾害机理与预警重点实验室开放基金项目(HYMED202210,HYMED202301) （HYMED202210,HYMED202301）
