It is believed that organic acids in the troposphere mostly come from human activities and natural emission, and they play a key role in cloud nucleation and make an important contribution to the CCN population,their species remain poorly characterized.

• 对流层中的有机酸主要来源于人类活动和自然的排放,它们对云成核现象有重要作用并且对云凝结核(CCN)的数量有显著的贡献,但具体哪些种类的有机酸起着什么样的作用以及有多大的作用却鲜为人知。