摘要
利用陕西黄土高原区域分布均匀的15个气象站1959-2008年4~10月温度和降水资料,计算了相对湿润度指数,通过聚类分析将陕西黄土高原分为榆林、延安北部、延安南部、关中西部和关中东部5个区,并将4~10月分为春(4~6月)、夏(7~8月)、秋(9~10月)三个季节。采用百分位数方法,确定了分区分季节的干旱等级标准。同时利用另外5个代表站对制定的干旱指标进行了检验,并与2008年7月和2009年6月的降水距平百分率、标准化降水指数和综合干旱指数进行了对比分析。结果表明,经本地化订正后的相对湿润度指数适合在陕西黄土高原应用,大大提高了干旱的精细化监测水平。
Based on the meteorological data including monthly temperature and precipitation from April to October 1959-2008 at 15 weather stations in Loess Plateau of Shaanxi Province,the relative moisture index is calculated.The results show that the Loess Plateau of Shaanxi Province is divided into 5 types by cluster analysis method,namely Yulin,north Yan′an,south Yan′an,west Guanzhong and east Guanzhong,the three seasons are divided from April to October,namely spring（April^June）,summer（July^August） and autumn（September^October）.The standard of drought grade for region and season is determined using the percentile method.Meanwhile the determined drought index is checked using other 5 stations,the precipitation anomaly precentage,standardized precipitation index and comprehensive drought index in July 2008 and June 2009 are analyzed and compared.The results show that the revised localization relative moistur index is suitable for application in Loess Plateau of Shaanxi.The application of regional weather station data to drought monitoring is realized,and the drought refinement monitoring level is greatly improved.
出处
《高原气象》
CSCD
北大核心
2011年第1期142-149,共8页
Plateau Meteorology
基金
陕西省气象局科技创新项目(2009M-7)资助
关键词
陕西黄土高原
区域天气站
精细化指数
干旱
Loess Plateau in Shaanxi
Regional weather station
Precise index
Drought
