CAJ | 학술논문

基于主成分分析和旋转主成分分析方法，应用陕、甘、宁、青4省（区）170个测站的降水量观测资料，分析了西北东部1961～2010年降水量区域分布、地域相关和年际变化特征。结果表明：西北地区东部降水异常在空间上主要表现为较高的整体一致性，其次表现为东西相反和南北相反的变化趋势。西北地区东部降水异常存在4个基本相关的区域：陇东南和陕西中南部区、陇中宁夏和陕北区、青海高原区和河西走廊区。近50 a来，陇中宁夏和陕北区、河西走廊区各年代降水呈反位相变化；陇东南和陕西中南部区、青海高原区1961年以来的前40 a各年代变化趋势一致，本世纪初的10 a变化相反。河西走廊区、青海高原区则向湿转变，陇中宁夏和陕北区、陇东南和陕西中南部区干旱程度更为明显。
기우주성분분석화선전주성분분석방법，응용협、감、저、청4성（구）170개측참적강수량관측자료，분석료서북동부1961～2010년강수량구역분포、지역상관화년제변화특정。결과표명：서북지구동부강수이상재공간상주요표현위교고적정체일치성，기차표현위동서상반화남북상반적변화추세。서북지구동부강수이상존재4개기본상관적구역：롱동남화협서중남부구、롱중저하화협북구、청해고원구화하서주랑구。근50 a래，롱중저하화협북구、하서주랑구각년대강수정반위상변화；롱동남화협서중남부구、청해고원구1961년이래적전40 a각년대변화추세일치，본세기초적10 a변화상반。하서주랑구、청해고원구칙향습전변，롱중저하화협북구、롱동남화협서중남부구간한정도경위명현。
Based on principal component analysis and rotated principal component analysis methods,the spatial distribution,correlation regions and interannual variability characteristics of precipitation from 1961 to 2010 in east part of northwest China were analyzed by u-sing the observation data of 170 stations from Shaanxi,Gansu,Ningxia and Qinghai.The results show that the precipitation anomaly in east part of northwest China presented mainly overall consistency firstly,secondarily,it followed opposite change trend in the east and the west as well as the south and the north part.There were four related areas of precipitation anomaly in east part of northwest China including the area in southeast of Gansu and the central and southern Shaanxi (area I),the area in central Gansu,Ningxia and north of Shaanxi (area II),the area in plateau of Qinghai (area III)and Hexi Corridor (area IV).In recent 50 years,precipitation of the area II and IV presented reverse phase change in each decade.While,the variation trend of precipitation in the area I and III was con-sistent from 1961 to 2000,but their changes were opposite in the 2000s.The climate turned to be wet both in the area III and IV and to be more significant drought in the area I and II.