中阳县蒸发量变化特征及影响因子分析

Change Characteristics and Influence Factors Analysis of Evaportion Capacity in Zhongyang County

利用中阳县气象观测站近43a（1971—2013年）的蒸发量、日照时数、平均气温、相对湿度、降水量、风速等观测资料，运用数理统计方法计算气候变化速率和相关系数，对中阳县蒸发量的年、季、月的气候变化特征，以及各气象因子与蒸发量之间的相关关系进行了初步研究。结果表明：中阳县近43a年、夏、秋季的蒸发量存在明显的下降趋势，尤其是夏季蒸发量的减少对全年蒸发量下降影响最大；影响蒸发量变化的主要因子有日照时数、气温、相对湿度、降水量、风速等，其中蒸发量与日照时数呈较好的正相关，与相对湿度和降水量呈负相关。

Based on the 43 years observational data in Zhongyang county from 1971 to 2009, which includes evaporation capacity, sunshine duration, average temperature, relative humidity, precipitation, wind velocity and other meteorological elements, that the climate change characteristics of annual, seasonal, monthly evaporation capacity in Zhongyang county were revealed. The relationships between evaporation capacity and other meteorological elements were studied by applying means of mathematical statistics calculated the climate change rate and correlation coefficient. The results show the annual, summer and autumnal evaporation capacity in Zhongyang county obviously descend in the last 43 years and the summer evaporation capacity reduce had the largest on the falling of the annual evaporation capacity. The sunshine duration, temperature, relative humidity, precipitation and wind velocity are more significantly correlated with the change of evaporation capacity among all affecting factors. Evaporation capacity with sunshine duration was positive correlation, with relative humidity and precipitation were negative correlation .