A field study of the oxidation of SO2 in cloud
A field study of the oxidation of SO2 in cloud
复制标题
云中SO2氧化的现场研究
DOI：
10.1029/jd095id09p13985
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发表时间：
1990
影响因子：
--
通讯作者：
T. Choularton
中科院分区：
文献类型：
--
作者：
P. Clark;G. P. Gervat;T. A. Hill;A. Marsh;A. S. Chandler;T. Choularton
本文描述了在英国宾宁北部大顿瀑布进行的一系列野外实验之一的实施和分析，该实验旨在研究云中SO{sub2}的氧化。这些实验旨在通过人为地将SO2气体释放到空气中进入云底来隔离对云化学的影响。1986年4月30日在云层中进行的观测，清楚而明确地证明了云水中硫酸盐离子的产生。H{sub2}O{sub2}浓度的同时下降表明，其中约40%来自于H{sub2}O{sub2}与SO{sub2}的快速反应。现场云物理和化学发展的综合模式的结果与观测结果吻合较好，表明剩余的硫酸盐是由于云中较高的pH促进了云中O{sub3}与SO{sub2}的反应而产生的。通过该模型将结果外推到其他输入气体浓度，证明了气态氨在控制云水pH以及因此O{sub3}氧化SO{sub2}方面的重要性，因为发现在较大的浓度范围内，空气在云中到达给定点时产生的总硫酸盐几乎与初始SO{sub2}浓度无关，并且与环境氨浓度大致成正比。
This paper describes the execution and analysis of one of a series of field experiments performed at Great Dun Fell in the northern Pennines of England designed to study the oxidation of SO{sub 2} in cloud. The experiments are designed to isolate the effect on cloud chemistry by artificially releasing SO{sub 2} gas into the air entering cloud base. Observations made in cloud on April 30, 1986, clearly and unequivocally demonstrated the production of sulfate ions in cloudwater. A simultaneous decrease in H{sub 2}O{sub 2} concentration demonstrated that about 40% of this arises from rapid reaction between H{sub 2}O{sub 2} and SO{sub 2}. The results of a comprehensive model of the cloud physical and chemical development at the site show good agreement with observations, and indicate that the remaining fraction of sulfate produced resulted from the reaction of O{sub 3} with SO{sub 2} in cloudwater, promoted by the relatively high pH found in the cloud. Extrapolation of the results to other input gaseous concentrations by means of the model demonstrates the important of gaseous ammonia in controlling cloudwater pH and hence the oxidation of SO{sub 2} by O{sub 3}, in that it is found that over a wide range ofmore » SO{sub 2} concentrations, the total sulfate produced by the time air reaches a given point in the cloud is virtually independent of the initial SO{sub 2} concentration, and roughly proportional to the ambient ammonia concentration.« less