近58a本溪山区蒸发量变化特征及影响因子通径分析

利用本溪市草河口气象站1953—2010年蒸发量、气温、降水量、日照、风速、水汽压等资料,采用气候趋势分析和通径分析方法,对本溪山区近58 a蒸发量及其影响因子进行了分析。结果表明,本溪山区年蒸发量呈明显增加趋势,其线性倾向率为25.64 mm/10 a,6种气象因素对蒸发的决定程度按大小排序依次为:降水量饱和差气温年较差年平均气温风速日照时数,年降水量与其他因子的协同作用对蒸发量的决定作用也很大。蒸发量增加是由本溪山区日照减少、风速减小、暖干化趋势造成的。

Path Analysis on Evaporation Variation Characteristic and the Impacting Factors in Benxi Hilly Area during Recent 58 Years

Based on the data of annuM evaporation, temperature, precipitation, sunshine, wind speed and vapor pressure of weather station in Caohekou, Benxi from 1953 to 2010, and using methods of climatic trend, path analysis of the evaporation and affecting factors was conducted. The result showed that annum evaporation showed a significant increasing trend and its linear trend rate 25.64 mm/10 a. Meteorological factors affecting evaporation were orderly as precipitation, air vapor pressure deficit, annum temperature range, average annum temperature, wind speed, and sunshine. Annum precipitation and other meteorological factors also affected the evaporation greatly. The increase in evaporation was mostly resulted from reduction of sunshine duration, wind speed and wanning-drying trend.