广州地区1994年6月洪涝期间降水的物理化学特征

受9403号强热带风暴登陆和锋面暴雨的影响，致使珠江下游出现百年一遇特大洪涝灾害，本文在此期间分析了在从化气象站密集观测的雨水成分与雨滴谱资料，结果表明:（1）雨滴谱型以多峰谱为主，极少出现无峰谱；（2） 雨水的pH值均比较低；（3）在雨水离子中以SO2-4和NH+4的浓度最高，雨水中被富集的主要是NO-3；（4）气溶胶水溶性离子成分中，SO2-4和Ca2+的浓度最高。

The Physical and Chemical Features of Heavy Rain over Guangzhou Area in June 1994

Because of No 9403 severe tropical storm and a frontal storm, very heavy rainfall lead to the severest flood damage in the Pearl River downstream area once a hundred years This paper analyses the rain compositions and raindrop spectrum data collected densely at Conghua station during this period The main results are: (1) the raindrop spectrum type is mainly multimodal seldom occurring non-peak spectrum, (2) the pH-values of rain are quite low, (3) in rain negative ions, the SO 2- 4 density is the highest, while NH + 4 is the largest in positive ions, and what is mainly concentrated is NO - 3, (4) in aerosol water dissoluble ions, the SO 2- 4 density is the highest in all of negative ions, and Ca 2+ is the highest in positive ions