Comment on egusphere-2026-2191
Rattachement africain : de. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Abstract. In the marine environment dimethylsulfide (DMS) is the most abundant sulfur-containing trace gas. It serves as a key precursor to new particle formation and growth via its oxidation products, sulfuric acid (SA, H2SO4) and methanesulfonic acid (MSA, CH3SO3H). Here, we present measurements of MSA and SA in the Indo-Pacific region during the CAFE-Pacific (Chemistry of the Atmosphere Field Experiment in the Pacific) campaign in January–February 2024. The measurements were conducted on board the HALO (High Altitude and LOng-range) aircraft using nitrate mass spectrometry. We observe gas-phase concentrations of up to 4 × 107 cm-3 MSA and 6 × 107 cm-3 SA in the marine boundary layer. In the lower free troposphere, the MSA/SA ratio increases with altitude in agreement with the temperature-dependent DMS oxidation. At higher altitudes, adiabatic heating and subsequent evaporation of acidic particles within the instrument inlet enable the detection of both particle- and gas-phase MSA and SA. A detailed analysis of two flights shows that marine deep convection can lead to DMS transport from the boundary layer to the upper troposphere and subsequent particle formation and growth after approximately 10–20 hours of OH exposure aligning with the DMS lifetime determined by kinetic modelling. We frequently observe MSA concentrations significantly exceeding those of SA, suggesting that free-tropospheric particles – particularly over the Indo-Pacific Warm Pool – may be dominated by MSA. Our results imply that marine convection represents an important source of airborne particles in the upper tropical troposphere, one of the most pristine regions of Earth's atmosphere.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Comment on egusphere-2026-2191
- Date Crossref
- 27/05/2026
- Éditeur
- Copernicus GmbH
- Type
- peer-review
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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Goethe University Frankfurt Institute for Atmospheric and Environmental Sciences pays non établi dans la noticeUniversité ou école supérieure
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Max Planck Institute for Chemistry Aerosol Chemistry Department pays non établi dans la noticeStructure de recherche
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Leibniz Institute for Tropospheric Research Atmospheric Microphysics Department pays non établi dans la noticeStructure de recherche
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Leipzig University of Applied Sciences pays non établi dans la noticeUniversité ou école supérieure
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Leipzig University pays non établi dans la noticeUniversité ou école supérieure
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Faculty of Physics and Earth Sciences pays non établi dans la noticeUniversité ou école supérieure
Institute for Atmospheric and Environmental Sciences — Goethe University Frankfurt, Aerosol Chemistry Department — Max Planck Institute for Chemistry et Atmospheric Microphysics Department — Leibniz Institute for Tropospheric Research, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.