西沙群岛大气中海盐粒子的分布特征

分析了在西沙永兴岛观测的Ｃｌ＾－海盐核资料，主要结果有：（１）东北季风期干直径大于２μｍ的Ｃｌ＾－核平均浓度８７８个／Ｌ，平均含盐量１０５．４μｇ／ｍ＾３，其中干直径大于４μｍ的特大核平均为１９０个／Ｌ，最大间观测到干直径５７μｍ的Ｃｌ＾－粒子，均较该地在１９８７年５月西南季风盛行期的观测值高。谱型呈准单调下降的幂函数递减谱。（２）随距海面高度增加海盐粒子浓度与含盐量均有所减小。（３）Ｃｌ＾－粒子     

DISTRIBUTION FEATURES OF GIANT SEA-SALT NUCLEI IN ATMOSPHERE OVER YONGXING ISLAND, XISHA ISLANDS,DURING NORTHEAST WINTER MONSOON

In this paper, the chlorine ions nuclei data, observed at Yongxing (Xisha Islands) during November 1987, are analyzed. The main results are:1) The average concentration of chiorine ions nuclei with dry diameters larger than 2 μm is 878 per litre and the average salt content is 105. 4μg/m³, in which special giant nuclei with dry diameters larger than 4 μm are 19O per litre. The largest dry diameter of chloride ions observed reaches 57 μm, which are larger than that observed there during the southwest summer monsoon. The spetrum type shows quasi-unimodal and exponential lapse. 2) The salt content decreases with the height over sea surface. 3) The concentrations of chlorine ions nuclei reach the maximum value at 0800 (Local time, same below). and minimum at 0200.     

广州盛夏期海盐核(Cl~-)巨粒子的分布特征

本文分析了1987年8至9月间在广州观测的Cl~-巨盐核资料。主要结果有:①干直径大于2μm的Cl~-核平均浓度31个/L,平均含盐量0.84μg /m~3,其中于直径大于4μm的特大核平均为3个/L,最大于直径25μm,均远低于南海海域的值。②浓度谱呈典型的单峰型幂函数递减谱,谱型窄而光滑;质量谱也表现为单峰分布。③盐核的日际变化与天气系统有密切关系,台风活动可造成海盐粒子浓度的大量增多,形成所谓“盐核暴”现象。