摘要
使用1963—2018年CRU TS v4.0.3逐月格点数据,通过计算新疆月、季、年不同时间尺度的标准化降水蒸散指数(SPEI)对干湿变化情况进行量化,并使用Mann-Kendall非参数检验、小波功率谱等方法对干湿指标的变化趋势与周期特征进行分析。结果表明:新疆在1988年前后表现出了干旱向湿润的转变;SPEI变化趋势整体以上升趋势为主,仅在新疆的西南、东南部分地区呈现出下降趋势;不同时间尺度下,小波功率谱的SPEI及其变化周期基本相同,在20世纪80—90年代均可以在2~4 a和8~16 a周期内发现振荡的高能区。
The standardized precipitation evapotranspiration index(SPEI)at different time scales was calculated to quantify the dry-wet variation by using the CRU TS 4.0.3 gridded data over 1963-2018.The methods such as Mann-Kendall non-parametric test and wavelet power spectrum were used to analyze the changing trend and periodic characteristics of wet and dry indexes.The results showed that Xinjiang showed a transition from drought to humid around 1988;The overall trend of change was mainly upward,only in the southwest and southeast parts of Xinjiang showed a downward trend;In different time scales,the SPEI of wavelet power spectrum and its changing period are basically the same,with strong oscillation energy regions concentrated in 2-4 a and 8-16 a in the 1980s and 1990s.
作者
宋玉鑫
马军霞
左其亭
张志卓
SONG Yuxin;MA Junxia;ZUO Qiting;ZHANG Zhizhuo(School of Water Conservancy Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhengzhou Key Laboratory of Water Resource and Environment,Zhengzhou 450001,China;Center for Water Science Research,Zhengzhou University,Zhengzhou 450001,China)
出处
《水资源保护》
CAS
CSCD
北大核心
2021年第2期43-48,共6页
Water Resources Protection
基金
国家自然科学基金(U1803241,51779230)。
