平潭露形成的气象指标研究

Study on the Meteorological Index of Dew Formation in Pingtan

应用平潭综合实验区2004—2013年露天气现象资料,分析平潭地区露形成的时间分布特征,研究露形成的气象要素条件。结果表明,10年间平潭露日呈下降趋势,且有明显的季节性特征,春夏季多发,春季的概率达45%,5月最多,达20 d,10月出现露日最少,为5.7 d;云量不能作为平潭露形成的气象要素判定指标;平潭露形成的最有利气象条件是夜晚或清晨,风速2级左右,相对湿度为≥80%,t-td<4℃。

Based on the data of dew phenomenon in Pingtan comprehensive experimental zone from 2004 to 2013,the time distribution characteristics of dew formation in Pingtan area were analyzed,and the meteorological factors and conditions of dew formation were studied.The results showed that the dew day in Pingtan had a downward trend in the past 10 years,and it had obvious seasonal characteristics.It occurred frequently in spring and summer,with a probability of 45%in spring.Cloud amount could not be used as the index to judge the meteorological factors of Pingtan dew formation.The most favorable meteorological conditions for the dew formation in Pingtan were at night or in the early morning,with wind speed of about grade 2,relative humidity≥80%,t-td<4℃.