Articles | Volume 22, issue 22
https://doi.org/10.5194/acp-22-14631-2022
https://doi.org/10.5194/acp-22-14631-2022
Research article
 | 
18 Nov 2022
Research article |  | 18 Nov 2022

Long-term declines in atmospheric nitrogen and sulfur deposition reduce critical loads exceedances at multiple Canadian rural sites, 2000–2018

Irene Cheng, Leiming Zhang, Zhuanshi He, Hazel Cathcart, Daniel Houle, Amanda Cole, Jian Feng, Jason O'Brien, Anne Marie Macdonald, Julian Aherne, and Jeffrey Brook

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Cited articles

Aherne, J. and Jeffries, D.: Critical Load Assessments and Dynamic Model Applications for Lakes in North America, in: Critical Loads and Dynamic Risk Assessments, series Environmental Pollution, vol. 25, edited by: de Vries, W., Hettelingh, J. P., and Posch, M., Springer, Dordrecht, https://doi.org/10.1007/978-94-017-9508-1_19, 2015. 
Altshuller, A.: Model predictions of the rates of homogeneous oxidation of sulfur dioxide to sulfate in the troposphere, Atmos. Environ., 13, 1653–1661, 1979. 
Anastasopolos, A. T., Sofowote, U. M., Hopke, P. K., Rouleau, M., Shin, T., Dheri, A., Peng, H., Kulka, R., Gibson, M. D., Farah, P. M., and Sundar, N.: Air quality in Canadian port cities after regulation of low-sulphur marine fuel in the North American Emissions Control Area, Sci. Total. Environ., 791, 147949, https://doi.org/10.1016/j.scitotenv.2021.147949, 2021. 
Benish, S. E., Bash, J. O., Foley, K. M., Appel, K. W., Hogrefe, C., Gilliam, R., and Pouliot, G.: Long-term regional trends of nitrogen and sulfur deposition in the United States from 2002 to 2017, Atmos. Chem. Phys., 22, 12749–12767, https://doi.org/10.5194/acp-22-12749-2022, 2022. 
Bergström, A. K. and Jansson, M.: Atmospheric nitrogen deposition has caused nitrogen enrichment and eutrophication of lakes in the Northern Hemisphere, Glob. Change Biol., 12, 635–643, 2006. 
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Short summary
Nitrogen (N) and sulfur (S) deposition decreased significantly at 14 Canadian sites during 2000–2018. The greatest decline was observed in southeastern Canada owing to regional SO2 and NOx reductions. Wet deposition was more important than dry deposition, comprising 71–95 % of total N and 45–89 % of total S deposition. While critical loads (CLs) were exceeded at a few sites in the early 2000s, acidic deposition declined below CLs after 2012, which signifies recovery from legacy acidification.
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