广州盛夏期海盐核(Cl^-)巨粒子的分布特征

DISTRIBUTION OF GIANT PARTICLES OF SEA- SALT NUCLEI IN GUANGZHOU DURING SUMMER

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。

In the paper, the data of giant sea-salt nuclei (Cl-) observed in Guangzhou area in August and September, 1987, were analyzed. The main results are:(1) The average concentration of chlorine ion nuclei and the average salt content whose dried diameters are larger than 2 μm. are 31 per litre and 6. 84 μg/m3 respectively, the special giant nuclei whose dried diameters are larger than 4 μm is 3 per litre, the largest dried diameter reaches 25 μm. They are all much lower than the values observed in South China Sea.(2) The spectrum of concentration shows a typical one-peak and power lapse pattern, and spectrum pattern is narrow and smooth. The spectrum of mass shows a one-peak pattern, too,(3) The day to day variation of the concentration of sea-salt nuclei is closely related to synoptic situation. The typhoon may make the concentration of sea-salt particles increase and form the phenomenon called 'sea-salt nuclei storm'.