| Download | - View final version: New methodology shows short atmospheric lifetimes of oxidized sulfur and nitrogen due to dry deposition (PDF, 5.6 MiB)
- View supplementary information: New methodology shows short atmospheric lifetimes of oxidized sulfur and nitrogen due to dry deposition (PDF, 1.1 MiB)
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| DOI | Resolve DOI: https://doi.org/10.5194/acp-21-8377-2021 |
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| Author | Search for: Hayden, Katherine; Search for: Li, Shao-Meng; Search for: Makar, Paul; Search for: Liggio, John; Search for: Moussa, Samar G.; Search for: Akingunola, Ayodeji; Search for: McLaren, RobertORCID identifier: https://orcid.org/0000-0003-1941-5567; Search for: Staebler, Ralf M.ORCID identifier: https://orcid.org/0000-0002-6372-0414; Search for: Darlington, AndreaORCID identifier: https://orcid.org/0000-0002-7469-5541; Search for: O'Brien, Jason; Search for: Zhang, Junhua; Search for: Wolde, Mengistu1; Search for: Zhang, LeimingORCID identifier: https://orcid.org/0000-0001-5437-5412 |
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| Affiliation | - National Research Council of Canada. Aerospace
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| Funder | Search for: Environment and Climate Change Canada |
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| Format | Text, Article |
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| Abstract | The atmospheric lifetimes of pollutants determine their impacts on human health, ecosystems and climate, and yet, pollutant lifetimes due to dry deposition over large regions have not been determined from measurements. Here, a new methodology based on aircraft observations is used to determine the lifetimes of oxidized sulfur and nitrogen due to dry deposition over (3-6) x 10³ km² of boreal forest in Canada. Dry deposition fluxes decreased exponentially with distance from the Athabasca oil sands sources, located in northern Alberta, resulting in lifetimes of 2.2–26 h. Fluxes were 2–14 and 1–18 times higher than model estimates for oxidized sulfur and nitrogen, respectively, indicating dry deposition velocities which were 1.2–5.4 times higher than those computed for models. A Monte Carlo analysis with five commonly used inferential dry deposition algorithms indicates that such model underestimates of dry deposition velocity are typical. These findings indicate that deposition to vegetation surfaces is likely underestimated in regional and global chemical transport models regardless of the model algorithm used. The model–observation gaps may be reduced if surface pH and quasi-laminar and aerodynamic resistances in algorithms are optimized as shown in the Monte Carlo analysis. Assessing the air quality and climate impacts of atmospheric pollutants on regional and global scales requires improved measurement-based understanding of atmospheric lifetimes of these pollutants. |
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| Publication date | 2021-06-02 |
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| Publisher | European Geosciences Union
Copernicus Publications |
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| Licence | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 71dd5f70-5a2d-4dde-98e8-386ab231bc2b |
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| Record created | 2022-10-31 |
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| Record modified | 2022-10-31 |
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