期刊
ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 14, 期 24, 页码 13551-13570出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-14-13551-2014
关键词
-
资金
- Swiss Federal Office for the Environment (FOEN)
- inNet Monitoring AG
- OSTLUFT
- country Liechtenstein
- Swiss canton Basel-Stadt
- Swiss canton Basel-Landschaft
- Swiss canton Graubunden
- Swiss canton St. Gallen
- Swiss canton Solothurn
- Swiss canton Valais
- Swiss canton Uri
- Swiss canton Ticino
While several studies have investigated wintertime air pollution with a wide range of concentration levels, hardly any results are available for longer time periods covering several winter-smog episodes at various locations; e.g., often only a few weeks from a single winter are investigated. Here, we present source apportionment results of winter-smog episodes from 16 air pollution monitoring stations across Switzerland from five consecutive winters. Radiocarbon (C-14) analyses of the elemental (EC) and organic (OC) carbon fractions, as well as levoglucosan, major water-soluble ionic species and gas-phase pollutant measurements were used to characterize the different sources of PM10. The most important contributions to PM10 during winter-smog episodes in Switzerland were on average the secondary inorganic constituents (sum of nitrate, sulfate and ammonium = 41 +/- 15 %) followed by organic matter (OM) (34 +/- 13 %) and EC (5 +/- 2 %). The non-fossil fractions of OC (f(NF, OC)) ranged on average from 69 to 85 and 80 to 95% for stations north and south of the Alps, respectively, showing that traffic contributes on average only up to similar to 30% to OC. The non-fossil fraction of EC (f(NF, EC)), entirely attributable to primary wood burning, was on average 42 +/- 13 and 49 +/- 15% for north and south of the Alps, respectively. While a high correlation was observed between fossil EC and nitrogen oxides, both primarily emitted by traffic, these species did not significantly correlate with fossil OC (OCF), which seems to suggest that a considerable amount of OCF is secondary, from fossil precursors. Elevated f(NF, EC) and f(NF, OC) values and the high correlation of the latter with other wood burning markers, including levoglucosan and water soluble potassium (K+) indicate that residential wood burning is the major source of carbonaceous aerosols during winter-smog episodes in Switzerland. The inspection of the non-fossil OC and EC levels and the relation with levoglucosan and water-soluble K+ shows different ratios for stations north and south of the Alps (most likely because of differences in burning technologies) for these two regions in Switzerland.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据