期刊
ATMOSPHERIC ENVIRONMENT
卷 61, 期 -, 页码 30-39出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2012.07.010
关键词
Long-range transport; Time trend; Ammonia; Ammonium sulphate
资金
- Swedish Environmental Protection Agency
- County Administrative Board of Jamtlands Lan
- Nordic Council of Ministers
- IVL Swedish Environmental Research Institute
Daily average air concentrations of ammonia plus particulate ammonium, nitric acid plus particulate nitrate, sulphur dioxide and particulate sulphate have been measured at four EMEP (European Monitoring and Evaluation Programme) sites in Sweden since 1986. From 1993 sampling was made with a filter pack that separates the gaseous and particulate forms. The separation is not perfect, but fairly good when compared to a denuder. The same filter pack was used for monthly measurements at four high altitude sites in the Swedish mountain areas. The concentration of particulate ammonium decreases more rapidly than the ammonia emissions in Sweden and neighbouring countries while the ammonia concentration increases. Particulate ammonium is mainly long-range transported from the continent to the southern parts of Sweden, while gaseous ammonia comes from all directions. The particulate ammonium concentrations are charged balanced with particulate sulphate and nitrate concentrations and the long-range transport is therefore limited by the availability of these anions. (C) 2012 Elsevier Ltd. All rights reserved.
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