广西沿海雾的气候特征及形成条件分析

Climatic Characteristics and Formation Conditions of Fog in Guangxi Coast

统计分析1963～2009年广西省沿海气象台站雾的观测资料和NCEP再分析资料,从气候特征、天气形势和气象条件3个方面分析广西沿海雾的气候特征和形成条件。结果表明,广西沿海雾出现最频繁时间段为08:00～09:00;主要发生在冬春季,其中以3月为最多,夏秋季很少;雾日数年际变化幅度大。广西沿海出现雾过程的天气形势主要有地面高压后部和弱冷空气影响2种。统计广西沿海雾和各气象要素的关系发现,广西处于水汽通量的大值区,水汽十分充沛;广西沿海雾形成要有适当的风速、风向;出现雾时地面气温在11～25℃;逆温层是出现大雾的有利条件,但并不是必要的条件。

Based on observation data of Guangxi coastal weather stations and NCEP reanalysis data during 1963-2009,the climate features,weather situation and meteorological conditions of coastal fog in Guangxi were analyzed.As indicated by the results,fog in Guangxi coast occurred most frequently during 08： 00-09： 00 in a day,and spring,winter in a year.The annual variation of fog days was significant.The weather situations of fog in Guangxi coast were divided into two types： in the back of the high pressure and influenced by weak cold air.Fog of Guangxi coast and meteorological elements were statistically analyzed.When the fog occurred,Guangxi had big value of water vapor flux,water vapor was very abundant.Guangxi was in appropriate wind speed and wind direction.The surface air temperature was between 11 and 25 ℃.The inversion layer was the favorable condition for fog,but not the necessary condition.