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Spatial and temporal concentration of ambient atmospheric ammonia in southern Ontario, Canada

Zbieranowski, Antoni L ; Aherne, Julian

Atmospheric Environment, December 2012, Vol.62, pp.441-450 [Periódico revisado por pares]

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  • Título:
    Spatial and temporal concentration of ambient atmospheric ammonia in southern Ontario, Canada
  • Autor: Zbieranowski, Antoni L ; Aherne, Julian
  • Assuntos: Agricultural Emissions ; Critical Levels ; Diffusive Passive Sampler ; Willems Badge ; Engineering ; Environmental Sciences
  • É parte de: Atmospheric Environment, December 2012, Vol.62, pp.441-450
  • Descrição: The spatial and temporal variability in ambient atmospheric ammonia (NH ) 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 NH concentrations were lowest during the winter and highest during the spring consistent with seasonal agricultural activity; the largest range in observed NH concentrations at an individual site was 0.4–15.8 μg m (winter–spring; intensive agricultural site). Annual average ambient NH concentrations ranged from 0.3 μg m at low agricultural intensity (background) sites (  = 4) to 2.8 μg m at intensive agricultural sites (  = 3); the largest range in biweekly NH concentrations across the 11 monitoring sites (during one exposure period) was ∼16 μg m (spring season). Annual average concentrations ranged from 0.1 μg m to 3.0 μg m 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 NH concentrations, cattle and pig numbers being the best predictors of annual average NH concentrations across southern Ontario. ► Ambient annual NH concentrations across Ontario ranged from <0.5 to >3.0 μg m . ► Largest two week variability in NH concentrations was during the spring ∼16 μg m . ► Ambient NH concentrations highly correlated to animal numbers in southern Ontario. ► Agricultural NH emissions leave a regional footprint across southern Ontario. ► Forest ecosystems may have reduced biodiversity due to predicted NH >1 μg m .
  • Idioma: Inglês

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