广西西江流域大雾的气候特征及大雾类型分类

Climatic characteristics and classification of heavy fog in Xijiang river basin of Guangxi

通过对1985-2014年西江干线流域7个气象站能见度观测资料的分析,得出西江流域大雾的气候变化分布规律:西江流域大雾的空间分布不均匀,局地性明显,上游少,下游多;西江流域平均雾日最多为1995年,最少为2014年;一年各个月份均有大雾生成,峰值主要集中在春季和冬季;大雾主要在凌晨生成;利用2005-2014年西江流域大雾按照天气学原理进行分类,西江流域大雾多为平流雾,142天,辐射雾72天,锋面雾48天。

Based on the analysis of the visibility data of 7 meteorological stations in the Xijiang river basin from 1985 to 2014, the distribution regulation of climate change of fog in Xijiang river basin is found out： the spatial and temporal distribution of fog in Xijiang river basin is uneven with obvious local characteristics of less upstream and more downstream. The maximum average fog days in the west river basin appeared in 1995, while that of minimum occurred in 2014. Fog could form in every month of the year, the peak mainly concentrates in spring and winter, and appearing in the early hours of the morning. According to the classification of the 2005-2014 west river basin fog data by principle of weather, the heavy fog in the Xijiang river basin is mostly plain fog （142 days） , 72 days of radiation fog and 48 days of frontal fog.