长江流域1951—2000年蒸发皿蒸发量变化趋势  

Pan evaporation trend in Yangtze River Basin from 1951 to 2000

作　　者：宋萌勃[1] 陈吉琴[1] 张晓健[2] 张文杰[2] 

机构地区：[1]长江工程职业技术学院,湖北武汉430212 [2]中南电力设计院,湖北武汉430071

出　　处：《水资源保护》2011年第1期24-27,33,共5页Water Resources Protection

摘　　要：以长江流域内115个气象站1951—2000年逐日气象观测数据为基础,采用线性倾向估计、滑动平均和相关分析等方法对长江流域近50年来蒸发皿蒸发量及其主要影响因子进行了相关性及趋势性分析。结果表明:近50年来,长江流域4个子区域年平均蒸发皿蒸发量呈下降趋势,其中中游下降趋势明显,其他3区域呈微弱下降趋势;蒸发皿蒸发量下降的主要原因可能是平均水汽压的增加和日照时间的减少。Based on daily meteorological data of 115 observation stations from 1951 to 2000 within the Yangtze River Basin, the correlation and trend of pan evaporation and its relation with meteorological factors in the past fifty years were analyzed by using linear trend estimate, moving average and correlation analysis method. The results demonstrated that the annual average pan evaporation presented a decrease trend in the past fifty years in the four reaches of Yangtze River Basin. The decrease tendency in the middle reach was more obvious and was weak in the other three reaches. The pan evaporation decrease was primarily resulted from increase of average vapour pressure and reduction of sunshine time.

关 键 词：蒸发皿蒸发量 趋势分析 气象因子 长江流域 

分 类 号：S161.42[农业科学—农业气象学]