乌苏大雾气候特征及变化分析

通过乌苏1954～2009年的大雾实测资料,对其时空分布特征进行了分析。结果表明,乌苏地区大雾天气主要发生在秋末至翌年春初,以12月出现最多,1月最少,具有显著的地域性特征和季节分布特征,但年际间大雾日数呈不规律状,虽与全国近10年雾日呈减少的趋势一致,但表现却并不显著。高空均压场和地面气压场形势与大雾的形成有着直接的关系。

Analysis of the Climate Features and Changes of Heavy Fog in Wusu County

Based on the measured data of heavy fog in Wusu County during 1954-2009,its temporal and spatial distribution characteristics were analyzed.The results showed that heavy fog in Wusu mainly happened from later autumn to beginning of the next spring.The most was in December,the least was in January.It had significant regional features and seasonal distribution characteristics.However,the days of heavy fog was irregular,but it was accordant with the decrease trend of frog days in recent years in China,while it was not significant.The situations of high-altitude uniform pressure field and the surface pressure field had a direct relationship with the formation of heavy fog.