期刊
ATMOSPHERIC ENVIRONMENT
卷 62, 期 -, 页码 441-450出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2012.08.041
关键词
Agricultural emissions; Critical levels; Diffusive passive sampler; Willems badge
资金
- Canada Research Chairs Program
- Natural Sciences and Engineering Research Council of Canada
- Environment Canada's Science Horizons Youth Internship Program
The spatial and temporal variability in ambient atmospheric ammonia (NH3) concentration was evaluated across southern Ontario, Canada, during the period August 2007-December 2010 using the Willems badge diffusive passive sampler (under a two week measurement frequency). A network of 11 monitoring sites was established across a land use transect reflecting low to high agricultural activity based on agricultural statistics and reported emissions. Ambient two-week average NH3 concentrations were lowest during the winter and highest during the spring consistent with seasonal agricultural activity; the largest range in observed NH3 concentrations at an individual site was 0.9-15.8 mu g m(-3) (winter-spring; intensive agricultural site). Annual average ambient NH3 concentrations ranged from 0.3 mu g m(-3) at low agricultural intensity (background) sites (n = 4) to 2.8 mu g m(-3) at intensive agricultural sites (n = 3); the largest range in biweekly NH3 concentrations across the 11 monitoring sites (during one exposure period) was similar to 16 mu g m(-3) (spring season). Annual average concentrations ranged from 0.1 mu g m(-3) to 3.0 mu g m(-3) across sites; nonetheless, there was strong temporal coherence among all sites suggesting a common regional 'footprint' from agricultural emissions. Regional agricultural statistics correlated well with NH3 concentrations, cattle and pig numbers being the best predictors of annual average NH3 concentrations across southern Ontario. (C) 2012 Elsevier Ltd. All rights reserved.
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