Biomass burning and marine aerosol processing over the southeast Atlantic Ocean: a TEM single-particle analysis

Caroline Dang*, Michal Segal-Rozenhaimer, Haochi Che, Lu Zhang, Paola Formenti, Jonathan Taylor, Amie Dobracki, Sara Purdue, Pui Shan Wong, Athanasios Nenes, Arthur Sedlacek, Hugh Coe, Jens Redemann, Paquita Zuidema, Steven Howell, James Haywood

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This study characterizes single-particle aerosol composition from filters collected during the ObseRvations of Aerosols above CLouds and their intEractionS (ORACLES) and CLoud-Aerosol-Radiation Interaction and Forcing: Year 2017 (CLARIFY-2017) campaigns. In particular the study describes aged biomass burning aerosol (BBA), its interaction with the marine boundary layer and the influence of biomass burning (BB) air on marine aerosol. The study finds evidence of BBA influenced by marine boundary layer processing as well as sea salt influenced by BB air. Secondary chloride aerosols were observed in clean marine air as well as in BB-influenced air in the free troposphere. Higher-volatility organic aerosol appears to be associated with increased age of biomass burning plumes, and photolysis or oxidation may be a mechanism for the apparent increased volatility. Aqueous processing and interaction with the marine boundary layer air may be a mechanism for the presence of sodium on many aged potassium salts. By number, biomass burning potassium salts and modified sea salts are the most observed particles on filter samples. The most commonly observed BC coatings are inorganic salts. These results suggest that atmospheric processes such as photolysis, oxidation and cloud processing are key drivers in the elemental composition and morphology of aged BBA. Fresh BBA inorganic salt content, as it has an important role in the particles' ability to uptake water, may be a key driver in how aqueous processing and atmospheric aging proceed.

Original languageEnglish
Pages (from-to)9389-9412
Number of pages24
JournalAtmospheric Chemistry and Physics
Issue number14
StatePublished - 21 Jul 2022


FundersFunder number
French National Agency for Space Studies
RadiatiOn and CLOuds
U.S. Department of EnergyDESC0020084
National Aeronautics and Space Administration
Seventh Framework Programme312609
Earth Sciences DivisionNNH13ZDA001N-EVS2
Natural Environment Research CouncilNE/L013584/1
National Research Foundation
Agence Nationale de la RechercheANR-15-CE01-0014-01
Centre National d’Etudes Spatiales
National Research Foundation of KoreaDE-SC0021250, UID 105958
Tel Aviv University


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