摘要
通过对一次典型华南春季锋面层状云降水的物理特征与化学性质的分层密集观测分析，认识到：（１）本次降水雨滴浓度不高，滴径较小，因而雨强较小；（２）雨水ｐＨ值较低，平均为４．７８；离子成分中以ＮＨ，ＳＯ，ＮＯ的含量最高，其次是Ｃｌ－与Ｎａ＋；（３）在贴地层内，雨水在下落过程中离子成分是增加的，ｐＨ值逐渐升高，增加最多的离子成份是ＮＨ；（４）在降水开始后雨水ｐＨ值起伏上升，而后持续下降，雨水中Ｃｌ－与Ｎａ＋关系密切。
Through layer-by-layer observational analysis to a typical case of frontal sheetcloud rainfall,some of its physical and chemical characteristics are obtained,which show that:(1)modest raindrops concentration and small drop diameter account for a light raininess;(2)the pH value(4.78 in average) is low and NH SO and NO are the dominant composition of ions with Cl- and Na+ next to them;(3)with the fall of raindrops at the near-surface layers. ion lvels and PH values increase.(4)the PH value rises in fluctuation at the onset of the rainfall coupled with a consistent desent afterwards.Cl- well relates with Na +
出处
《气象学报》
CSCD
北大核心
1996年第2期175-184,共10页
Acta Meteorologica Sinica
基金
国家气象局科学基金
关键词
锋面
降水
物理特征
化学性质
雨滴谱
Rainwater acidity
Rainwater chemical composition
Aerosol
Watersoluble ionic compositions.
