南水北调与水利科技2017，Vol.15Issue(5)：15-21,7.DOI:10.13476/j.cnki.nsbdqk.2017.05.003
基于SPEI干旱指数的东北地区干旱时空分布特征
Spatiotemporal characteristics of drought in Northeast China based on SPEI
摘要
Abstract
Based on monthly precipitation and average air temperature data from 86 national meteorological stations during the past 55 years (1960-2014) in the Northeast China,the values of Standardized Precipitation Evapotranspiration Index (SPEI) at various time scales were calculated to represent drought conditions,and the characteristics of spatiotemporal distribution of drought at different time scales in the Northeast China were analyzed.The calculation results were compared with the actual drought area data to verify the applicability of the SPEI to the drought assessment of the Northwest China.The results showed that the frequency of severe droughts in spring,summer,and winter would increase with the increase of the time scale,whereas the frequency of medium droughts would decrease with the increase of the time scale.Droughts and floods in the Northeast China occurred alternatively during the recent 55 years.The frequency and intensity of drought increased gradually on a decadal basis.Generally speaking,the scope of extreme droughts would gradually expand with the increase of the time scale.Droughts occurred at different frequencies in spring,summer,and spring in the Northeast China.No extreme drought occurred in winter in Jilin and Liaoning provinces.No severe drought occurred in the middle of Heilongjiang province.关键词
标准化降水蒸散指数/多时间尺度/东北地区/干旱Key words
standardized precipitation evapotranspiration index (SPEI)/multi-timescale/Northeast China/drought分类
大气科学引用本文复制引用
蔡思扬,左德鹏,徐宗学,杨晓静..基于SPEI干旱指数的东北地区干旱时空分布特征[J].南水北调与水利科技,2017,15(5):15-21,7.基金项目
水利部公益性行业科研专项经费项目资助(201401036) （201401036）
国家自然科学基金项目(51309010) （51309010）
National Public Welfare Foundation of the Ministry of Water Resources of China(201401036) （201401036）
National Natural Science Foundation of China(51309010) （51309010）
