Role of organic acids formic, acetic, pyruvic and / oxalic in the formation of cloud condensation / nuclei CCN : a review
Role of organic acids formic, acetic, pyruvic and / oxalic in the formation of cloud condensation / nuclei CCN : a review
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DOI：
10.1016/s0169-8095(00)00037-5
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发表时间：
2000-05
影响因子：
5.5
通讯作者：
Shaocai Yu
中科院分区：
文献类型：
--
作者：
Shaocai Yu
尽管人们认为有机气溶胶在云成核中起着关键作用，并对云凝结核（CCN）的数量做出了重要贡献，但其具体种类的特征仍然很差。本文综述了有机酸（主要是甲酸、乙酸、草酸和草酸）的研究现状。本文中的有机酸是指气相和气溶胶相中的这四种有机酸。本文分析了有机酸作为CCN的程度，并对有机酸与CCN的物理化学性质进行了比较。结果表明，气溶胶中甲酸盐和乙酸盐的浓度范围分别为0.02 ~ 5.3 nmol m− 3和0.03 ~ 12.4 nmol m−3，气溶胶中的精细组分中甲酸盐和乙酸盐的含量分别为34%~ 77%和21%~ 66%。据发现，虽然大多数（98-99%）的这些挥发性有机酸存在于气相中，它们的浓度在气溶胶颗粒足以使它们成为一个很好的候选人CCN。研究结果还表明，在一些特殊的源如植被排放和生物质燃烧中，有机酸可能对云凝结核的形成有重要贡献。有机酸预计将大大有助于间接（云介导）强迫气溶胶的估计。
Although it is believed that organic aerosols play a key role in cloud nucleation and make an important contribution to the cloud condensation nuclei (CCN) population, their specific species remain poorly characterized. This paper reviews the current knowledge of organic acids (mainly formic, acetic, pyruvic and oxalic acids). Without specification, organic acids in this paper refer to these four organic acids in the gas and aerosol phases. This paper analyzes the extent to which organic acids act as CCN and compares the physical and chemical properties of organic acids with those of CCN. The results show that aerosol formate and acetate concentrations range from 0.02 to 5.3 nmol m−3and from 0.03 to 12.4 nmol m−3, respectively, and that between 34 to 77% of formate and between 21 to 66% of acetate are present in the fine fraction of aerosols. It was found that although most (98–99%) of these volatile organic acids are present in the gas phase, their concentrations in the aerosol particles are sufficient to make them a good candidate for CCN. The results also show that organic acids may make an important contribution to the formation of CCN in some special sources such as vegetation emissions and biomass-burning. Organic acids are expected to contribute significantly to the estimates of indirect (cloud-mediated) forcing due to aerosols.