南宁站蒸发皿蒸发变化特性及成因分析

基于南宁气象站1954-2012年气象数据，采用距平法、Mann-Kendall检验法、突变分析法及相关分析法等方法分析了蒸发皿蒸发的变化趋势以及蒸发皿蒸发与其他气象要素（降水、气温、日照时数、风速、相对湿度等）的相关性，识别影响蒸发皿蒸发变化的主导因素。结果表明：1954-2001年期间，蒸发皿蒸发主要呈现下降趋势；日照时数与蒸发皿蒸发的相关性最高，其次为风速和相对湿度，说明影响南宁站蒸发皿蒸发变化的主要因素是日照时数、风速及相对湿度。

Variation characteristics of pan evaporation at Nanning Meteorological Station and analysis of causes

At Nanning Meteorological Station,anomaly method,Mann-Kendall test,mutation analysis and correla-tion analysis were adopted to study the variation trends of pan evaporation based on the meteorological data from 1954 to 2012. In order to find out the dominant factors which affect the variation of pan evaporation,the authors al-so analyze the correlation between pan evaporation and other meteorological variables such as precipitation ,air tem-perature,sunshine hours,wind speed and relative humidity. The results of study demonstrate that pan evaporation had a decline trend during the period of 1954~2001;sunshine duration,wind speed and relative humidity are the ma-jor factors influencing pan evaporation at Nanning Station,of which the sunshine hours is the most correlated factor.