摘要
基于西南地区142个气象站1960-2014年的逐日气象资料,引入一个新的干旱指数-逐日标准化降水蒸散指数(日SPEI),采用Mann-Kendall方法、克里金插值(Kriging)方法,分析了近55a西南地区干旱事件时空演变规律。结果显示:西南地区所有干旱、严重干旱事件的强度和持续天数呈增加趋势,极端干旱事件强度和持续天数呈小幅减少趋势,西南地区总体呈干旱化趋势。干旱强度和持续时间在1960s、1970s、2000s较大,2000s是西南地区遭受持续性干旱最严重的十年,接近2/3的站点发生了较严重的干旱,主要分布在广西和云南西南部地区。西南17%的站点干旱程度最严重,主要分布在四川中部、贵州西北部、广西西北部和南部的部分地区。
Using daily meteorological data collected from 142 stations across the Southwest China from 1960 to 2014, the daily Standardized Precipitation Evapotranspiration Index（SPEI） was developed based on daily mete- orological data in this study. The daily SPEI data, the Kriging interpolation and the Mann - Kendall test were used to assess the variability and pattern of drought characteristics for the period from 1960 to 2014 in the South- west China. At annual - timescales, the intensity and duration of all drought events, severe drought events showed an increasing trend. The extreme drought events intensity and duration decreased. The drought situation was aggravating in the entire region. The drought intensity and duration was higher in the 1960s, 1970s, and the highest in the 2000s during the past 55 years. About 66% of the meteorological stations suffered more severe drought, mostly in Guangxi and southwestern Yunnan province from 1991 -2000. Nearly 17% of the meteoro- logical stations presented a most serious drought trend for the past 55 years over the entire area, especially in the center of Sichuan province, the northwestern Guizhou province, the northwestern Guangxi province, and the Southern Guangxi.
作者
贾艳青
张勃
马彬
曹博
吴乾慧
JIA Yanqing;ZHANG Bo;MA Bin;CAO Bo;WU Qianhui(Department of Geography, Xinzhou Normal University, Xinzhou 034000, China;College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China)
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2018年第5期171-176,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(41561024)
山西省高等学校哲学社会科学研究项目(2015265)资助
关键词
干旱
时空分析
日SPEI
西南地区
drought
spatial -temporal characteristics
daily standardized precipitation evapotranspiration index（SPEI）
Southwest China
