The frequency of fog occurrence and fog water chemical characteristics are analyzed based on the surface observation data at Zhanjiang Station from 1951 to 2010 and the sea fog observation data on Donghai Island in Zhanjiang from 15 March 2010 to 20 April 2010. Result shows that the sea fogs in Zhanjiang are acidic, with pH in the range of 4.80～6.05. The electrical conductivity of the fog water during the formation stage is higher than that during the duration stage, indicating that a large amount of pollution dissolves in the fog water when fog forms. The non-linear fitting result of the relationship between the electrical conductivity and pH shows that the correlation coefficient is 0.61, indicating a certain connection between these two properties. Compared with the fog water in the other areas in China, the ionic concentrations of Zhanjiang fog are higher. Cl and NO3 are the dominant anions, especially Cl reaching 13000 pmol/L,but SO42 is lower; with regard to the cation, Na+ dominates. The electrical conductivity is higher than those in the other areas. The higher concentrations of Ca2+ and Mg2+ are dominantly affected by near-surface soil dust (mainly carbonate of calcium and iron). The ionic concentrations are higher during the early stage of fog and decrease during the fog development. The ionic concentrations are related to the fog types.%利用湛江1951-2010年地面观测资料及2010年3月15日～4月20日在湛江东海岛6次海雾观测数据,分析了湛江海雾发生的规律和雾水化学特性.结果表明,湛江海雾属于酸性海雾,pH值变化范围从4.80～6.05.海雾发生初期的电导率比雾发生期间高很多,说明海雾发生的初始阶段雾水中溶解了大量的污染物.对样本的电导率与pH值进行非线性拟合,相关系数为0.61,表明存在一定的相关性.湛江东海岛雾中各离子浓度很高,与其他城市相比较,湛江海雾阴离了Cl-和NO3很高,特别是Cl-达13000μmol/L,但SO2-4不高;阳离子中Na+很高.电导率比其他城市偏高.Ca2+和Mg2+的离子浓度较岛,主要是受近地表土壤(主要是钙和铁的碳酸盐)尘埃影响.在雾过程的前期,雾水中各离子成分浓度最高,雾过程期间浓度偏低.各种离了浓度与雾的类型有关.
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