| 海盐氯循环对输送污染物致酸的缓冲作用 |
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| 引用本文： | 姚小红,黄美元,高会旺,郝吉明.海盐氯循环对输送污染物致酸的缓冲作用[J].大气科学,1998,22(6):913-918. |
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| 作者姓名： | 姚小红 黄美元 高会旺 郝吉明 |
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| 作者单位： | 中国科学院大气物理研究所,北京 100029 |
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| 摘 要： | 着重研究海盐氯循环对输送污染物致酸的缓冲作用，通过对全球低污染点酸雨资料分析，初步结论是:海盐氯循环使经过海洋上空输送的致酸大气污染物转化为中性盐，这一机制缓冲了经过海洋上空输送的致酸前提物的酸性，使受体点降水中出现氯亏损、硫富集，并伴随有降水中氯亏损和H+离子浓度的负相关。在高氯亏损降水样品中，降水pH值一般大于5.0。硫同位素动力学分析表明，当降水pH值大于5.6氯亏损时，污染物在海洋上空输送过程中和海盐发生非均相反应的速率与其发生均相反应的速率接近。但这一机制仅适用沿海地区。
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| 关 键 词： | 氯 海盐 酸雨 |
| 修稿时间： | 1/1/1998 12:00:00 AM |
Sea-Salt Chloride Cycles Buffers Rainwater Acidified by Transported Pollutants |
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| Yao Xiaohong,Huang Meiyuan,Gao Huiwang and Hao Jiming.Sea-Salt Chloride Cycles Buffers Rainwater Acidified by Transported Pollutants[J].Chinese Journal of Atmospheric Sciences,1998,22(6):913-918. |
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| Authors: | Yao Xiaohong Huang Meiyuan Gao Huiwang and Hao Jiming |
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| Abstract: | This paper is concentrated in the mechanism with which chloride cycles buffer rainwater acidified by transported pollutants. According to chemical analysis of acid rain in lowly polluted coastal areas, the result shows that transported pollutants are transformed to salt by the chloride cycles during transporting over ocean. When transported pollutant reacts with sea-salt, it causes chloride deficit and sulfate abundance in sea-salt aerosol. It also brings out the negative corelation between chloride and H + concentration. In samples with high chloride deficit, the pH value in rainwater is usually more than 5.0. According to the analysis of sulfur isotope, chloride deficit occurs when the pH value in rainwater is high, and the rate of heterogeneous reaction approaches to that of homogeneous reaction. This mechanism is only suitable for the case of rainwater acidified in the coastal areas. |
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| Keywords: | sea salt chloride acid rain |
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