| Téléchargement | - Voir la version finale : New methodology shows short atmospheric lifetimes of oxidized sulfur and nitrogen due to dry deposition (PDF, 5.6 Mio)
- Voir les données supplémentaires : New methodology shows short atmospheric lifetimes of oxidized sulfur and nitrogen due to dry deposition (PDF, 1.1 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.5194/acp-21-8377-2021 |
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| Auteur | Rechercher : Hayden, Katherine; Rechercher : Li, Shao-Meng; Rechercher : Makar, Paul; Rechercher : Liggio, John; Rechercher : Moussa, Samar G.; Rechercher : Akingunola, Ayodeji; Rechercher : McLaren, RobertIdentifiant ORCID : https://orcid.org/0000-0003-1941-5567; Rechercher : Staebler, Ralf M.Identifiant ORCID : https://orcid.org/0000-0002-6372-0414; Rechercher : Darlington, AndreaIdentifiant ORCID : https://orcid.org/0000-0002-7469-5541; Rechercher : O'Brien, Jason; Rechercher : Zhang, Junhua; Rechercher : Wolde, Mengistu1; Rechercher : Zhang, LeimingIdentifiant ORCID : https://orcid.org/0000-0001-5437-5412 |
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| Affiliation | - Conseil national de recherches du Canada. Aérospatiale
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| Bailleur de fonds | Rechercher : Environment and Climate Change Canada |
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| Format | Texte, Article |
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| Résumé | 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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| Date de publication | 2021-06-02 |
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| Maison d’édition | European Geosciences Union
Copernicus Publications |
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| Licence | |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 71dd5f70-5a2d-4dde-98e8-386ab231bc2b |
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| Enregistrement créé | 2022-10-31 |
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| Enregistrement modifié | 2022-10-31 |
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