济阳县蒸发量特征分析

Analysis on the Characteristics of Evaporation Capacity in Jiyang County

利用济阳县1965—2010年20 cm口径蒸发量资料,对济阳县46年蒸发量变化特征进行分析。结果表明:济阳县的蒸发量呈逐年减少趋势,减少幅度为1.48 mm/10 a,蒸发量在20世纪80年代初期呈明显变化,之前蒸发量基本都在平均值以上,之后蒸发量基本都在平均值以下,2个时段的平均差值为424.8 mm;春、夏、秋、冬各季节蒸发量均有减少,但减少的倾向率不同,主要与光照、气温和降水等气象要素有关。

Based on the dates of evaporative capacity with 20 cm diameter in Jiyang County from 1965 to 2010,this paper analyzed the evaporative capacity characteristics.The results showed that evaporative capacity of Jiyang County was decreasing year after year,the average descending range was 1.48 mm per 10 years.There was notable changes of evaporative capacity in the 80s of 20th century.Before 1980 s,the evaporative capacity was higher than average value.After 1980 s,the evaporative capacity was less than average value,and the average difference between this time periods was 424.8 mm.The evaporative capacity were decreasing in spring,summer,autumn and winter.Its decreasing propensity was different,which was closely related to the meteorological factors such as sunlight,temperature,precipitation and so on.