Atmospheric processing and aerosol aging responsible for observed increase in absorptivity of long-range-transported smoke over the southeast Atlantic
Rattachement africain : us, Afrique du Sud. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Biomass burning aerosol (BBA) from agricultural fires in southern Africa contributes about one-third of the global carbonaceous aerosol load. These particles have strong radiative effects in the southeast Atlantic (SEA), which depend in part on the radiative contrast between the aerosol layer in the free troposphere (FT) and the underlying cloud layer. However, there is large disagreement in model estimates of aerosol-driven climate forcing due to uncertainties in the vertical distribution, optical properties, and life cycle of these particles. This study applies a novel method combining remote sensing observations with regional model outputs to investigate the aging of the BBA and its impact on the optical properties during transatlantic transport from emission sources in Africa to the SEA. Results show distinct variations in extinction Ångström exponent (EAE) and single-scattering albedo (SSA) as aerosols age. Near the source, fresh aerosols are characterized by low mean SSA (0.84) and high EAE (1.85), indicating smaller, highly absorbing particles. By isolating marine contributions from the total column during BBA transport across the SEA, our analysis reveals an initial decrease in BBA absorptivity, with mean FT SSA of 0.87 after 6–7 d, followed by increased absorptivity with mean FT SSA of 0.84 after 10 d, suggesting enhanced absorption due to chemical aging. These findings indicate that BBA becomes more absorbing during extended transport across the SEA, with implications for reducing model uncertainties. Our remote-sensing-based results agree well with previous in situ studies and offer new insights into aerosol–radiation interactions and the energy balance over the SEA.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Atmospheric processing and aerosol aging responsible for observed increase in absorptivity of long-range-transported smoke over the southeast Atlantic
- Date Crossref
- 25/07/2025
- Éditeur
- Copernicus GmbH
- 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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University of Oklahoma pays non établi dans la noticeUniversité ou école supérieure
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University of California Department of Atmospheric and Oceanic Sciences pays non établi dans la noticeUniversité ou école supérieure
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NOAA Oceanic and Atmospheric Research pays non établi dans la noticeOrganisme public
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Sustainability Institute Afrique du Sud (code pays fourni par la source)Organisation à but non lucratif
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The Aerospace Corporation pays non établi dans la noticeOrganisation à but non lucratif
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Brookhaven National Laboratory Environmental Science and Technologies pays non établi dans la noticeStructure de recherche
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University of North Carolina at Charlotte Department of Earth pays non établi dans la noticeUniversité ou école supérieure
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National Oceanic and Atmospheric Administration pays non établi dans la noticeOrganisme public
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Cooperative Institute for Research in Environmental Sciences pays non établi dans la noticeStructure de recherche
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University of Colorado Boulder Cooperative Institute for Research in Environmental Sciences pays non établi dans la noticeUniversité ou école supérieure
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Ames Research Center pays non établi dans la noticeStructure de recherche
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Bay Area Environmental Research Institute pays non établi dans la noticeOrganisation à but non lucratif
University of Oklahoma, Department of Atmospheric and Oceanic Sciences — University of California et NOAA Oceanic and Atmospheric Research, avec 9 autres affiliations. Pays d’affiliation : Afrique du Sud.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.