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

Data sets

2000–2018 annual total deposition fluxes of nitrogen and sulfur at CAPMoN sites I. Cheng, L. Zhang, A. Cole, H. Cathcart, and D. Houle https://open.canada.ca/data/en/dataset/89a1e52c-d24e-4840-904f-fd6f2cb92648

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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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