Biomass burning and marine aerosol processing over the southeast Atlantic Ocean: a TEM single-particle analysis - Archive ouverte HAL Access content directly
Journal Articles Atmospheric Chemistry and Physics Year : 2022

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

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

Abstract

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.
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Dates and versions

insu-03839372 , version 1 (04-11-2022)

Licence

Attribution - CC BY 4.0

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Caroline Dang, Michal Segal-Rozenhaimer, Haochi Che, Lu Zhang, Paola Formenti, et al.. Biomass burning and marine aerosol processing over the southeast Atlantic Ocean: a TEM single-particle analysis. Atmospheric Chemistry and Physics, 2022, 22, pp.9389-9412. ⟨10.5194/acp-22-9389-2022⟩. ⟨insu-03839372⟩
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