Large role of anthropogenic climate change in driving smoke concentrations across the western United States from 1992 to 2020
Rattachement africain : us, ca. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Wildfire activity has increased dramatically in the western United States over the last three decades, having a significant impact on air quality and human health. However, quantifying the drivers of trends in wildfires and subsequent smoke concentrations is challenging, as both natural variability (NV) and anthropogenic climate change (ACC) play important roles. Here, we devise an approach involving observed meteorology and vegetation and a range of models to determine the relative roles of ACC and NV in driving burned area across the western United States. We also examine the influence of ACC on smoke concentrations. We estimate that ACC accounts for 33 to 82% of observed total burned area, depending on the ecoregion, yielding 65% of total fire emissions on average across the western United States from 1992 to 2020. In all ecoregions except Mediterranean California, ACC contributes to a greater percentage of burned area in lightning-ignited wildfires than in human-ignited wildfires. On average, ACC contributes 49% to smoke PM 2.5 concentrations in the western United States from 1997 to 2020, and explains 58% of the increasing trend in smoke PM 2.5 from 2010 to 2020. Northern California and areas in Oregon, Washington, and Idaho experience the greatest smoke concentrations attributable to ACC, averaging 40 to 66% of total PM 2.5 over 2010–2020. Our work highlights the significant role of ACC in degrading air quality in the western United States and identifies those regions most vulnerable to wildfire smoke and thus adverse health impacts.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Large role of anthropogenic climate change in driving smoke concentrations across the western United States from 1992 to 2020
- Date Crossref
- 02/12/2025
- Éditeur
- National Academy of Sciences
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Harvard University pays non établi dans la noticeUniversité ou école supérieure
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University of Calgary Department of Earth pays non établi dans la noticeUniversité ou école supérieure
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Stanford University pays non établi dans la noticeUniversité ou école supérieure
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Baylor University Department of Environmental Science pays non établi dans la noticeUniversité ou école supérieure
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University of British Columbia Department of Geography pays non établi dans la noticeUniversité ou école supérieure
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John A. Paulson School of Engineering and Applied Sciences pays non établi dans la noticeUniversité ou école supérieure
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Doerr School of Sustainability Department of Earth System Science pays non établi dans la noticeUniversité ou école supérieure
Harvard University, Department of Earth — University of Calgary et Stanford University, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.