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Leskinen, J.* ; Hartikainen, A.* ; Väätäinen, S.* ; Ihalainen, M.* ; Virkkula, A.* ; Mesceriakovas, A.* ; Tiitta, P.* ; Miettinen, M.* ; Lamberg, H.* ; Czech, H. ; Yli-Pirilä, P.* ; Tissari, J.* ; Jakobi, G. ; Zimmermann, R. ; Sippula, O.*

Photochemical aging induces changes in the effective densities, morphologies, and optical pof combustion aerosol particles.

Environ. Sci. Technol. 57, 5137-5148 (2023)

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Effective density (ρ_eff) is an important property describing particle transportation in the atmosphere and in the human respiratory tract. In this study, the particle size dependency of ρ_eff was determined for fresh and photochemically aged particles from residential combustion of wood logs and brown coal, as well as from an aerosol standard (CAST) burner. ρ_eff increased considerably due to photochemical aging, especially for soot agglomerates larger than 100 nm in mobility diameter. The increase depends on the presence of condensable vapors and agglomerate size and can be explained by collapsing of chain-like agglomerates and filling of their voids and formation of secondary coating. The measured and modeled particle optical properties suggest that while light absorption, scattering, and the single-scattering albedo of soot particle increase during photochemical processing, their radiative forcing remains positive until the amount of nonabsorbing coating exceeds approximately 90% of the particle mass.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Aerosol Optics ; Black Carbon ; Brown Coal ; Combustion Aerosol ; Morphology ; Photochemical Aging ; Residential Combustion ; Soot ; Wood; Secondary Organic Aerosol; Absorption Angstrom Exponent; Residential Wood Combustion; Black Carbon; Brown Carbon; Light-absorption; Source Apportionment; Radiative Properties; Soot Particles; Mixing State

ISSN (print) / ISBN 0013-936X

e-ISSN 1520-5851

Journal Environmental Science & Technology

Quellenangaben Volume: 57, Issue: 13, Pages: 5137-5148

Publisher ACS

Publishing Place Washington, DC

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Cooperation Group Comprehensive Molecular Analytics (CMA)

Grants Academy of Finland (AKA)
Business Finland project Black Carbon Footprint (BCF)
Academy of Finland project Antarctic Climate Forcing Aerosol (ACFA)
Academy of Finland
Aerosols and Health (HICE) - Initiative and Networking Fund of the Helmholtz Association (HGF, Germany)
Helmholtz Virtual Institute of Complex Molecular Systems in Environmental Health?