云南省水面蒸发量变化趋势  

Variation Tendency of Water Surface Evaporation in Yunnan Province

作　　者：王超[1] 

机构地区：[1]云南省水文水资源局,云南昆明650106

出　　处：《水文》2009年第S1期99-101,共3页Journal of China Hydrology

摘　　要：根据云南省128个气象站点1960～2000年的观测数据,分析了各站点的20cm口径蒸发皿(以下简称蒸发皿)蒸发量的变化趋势,并对相关的太阳辐射、风速、气温、相对湿度、水汽压等影响因素进行了分析。结果表明,近40年来,云南省各地全年及四季的蒸发皿蒸发量均呈现显著下降趋势。蒸发量的变化趋势空间分布差异不大,但滇中、滇东、滇东南地区蒸发量呈下降趋势的站点较为集中。尽管近年来云南省内各地气温有所上升,但对蒸发量的影响并不明显;近年来太阳净辐射和风速呈显著下降趋势,而风的形成与太阳辐射密切相关,因此,太阳辐射量下降可能是导致蒸发量下降的主要物理成因。According to observed data from 128 meteorology stations in Yunnan Province from 1960 to 2000,this paper analyzed the variation tendency of pan evaporation,solar radiation,wind velocity,air temperature,relative humidity and vapor pressure.The results show that 20 cm pan evaporation and four seasons evaporation in Yunnan Province appears a trend of greater drop in yield. There is no big difference for evaporation variation tendency directional distribution,but evaporation in central areas,eastern and southeastern areas appear the declining trend.Although the temperature has ascension in recent years,there is no obvious effect on evaporation.The solar radiation and wind speed appear a trend of greater drop in yield in recent years,also,the formation of wind is closely related to solar radiation.Therefore,the descent of solar radiation is the major physical cause which leads to evaporation declining.

关 键 词：云南省 蒸发皿蒸发量 太阳净辐射 气温 降水 风速 变化趋势 

分 类 号：P333.1[天文地球—水文科学]