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Helin, A.* ; Virkkula, A.* ; Backman, J.* ; Pirjola, L.* ; Sippula, O.* ; Aakko-Saksa, P.* ; Väätäinen, S.* ; Mylläri, F.* ; Järvinen, A.* ; Bloss, M.* ; Aurela, M.* ; Jakobi, G. ; Karjalainen, P.* ; Zimmermann, R. ; Jokiniemi, J.* ; Saarikoski, S.* ; Tissari, J.* ; Rönkkö, T.J.* ; Niemi, J.V.* ; Timonen, H.*

Variation of absorption Ångström exponent in aerosols from different emission sources.

J. Geophys. Res. Atmos. 126:e2020JD034094 (2021)
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The absorption Ångström exponent (AAE) describes the spectral dependence of light absorption by aerosols. AAE is typically used to differentiate between different aerosol types for example., black carbon, brown carbon, and dust particles. In this study, the variation of AAE was investigated mainly in fresh aerosol emissions from different fuel and combustion types, including emissions from ships, buses, coal-fired power plants, and residential wood burning. The results were assembled to provide a compendium of AAE values from different emission sources. A dual-spot aethalometer (AE33) was used in all measurements to obtain the light absorption coefficients at seven wavelengths (370–950 nm). AAE varied greatly between the different emission sources, ranging from −0.2 ± 0.7 to 3.0 ± 0.8. The correlation between the AAE and AAE results was good (R  = 0.95) and the mean bias error between these was 0.02. In the ship engine exhaust emissions, the highest AAE values (up to 2.0 ± 0.1) were observed when high sulfur content heavy fuel oil was used, whereas low sulfur content fuels had the lowest AAE (0.9–1.1). In the diesel bus exhaust emissions, AAE increased in the order of acceleration (0.8 ± 0.1), deceleration (1.1 ± 0.1), and steady driving (1.2 ± 0.1). In the coal-fired power plant emissions, the variation of AAE was substantial (from −0.1 ± 2.1 to 0.9 ± 1.6) due to the differences in the fuels and flue gas cleaning conditions. Fresh wood-burning derived aerosols had AAE from 1.1 ± 0.1 (modern masonry heater) to 1.4 ± 0.1 (pellet boiler), lower than typically associated with wood burning, while the burn cycle phase affected AAE variation. 470/950 470/950 370-950 470/950 470/950 470/950 470/950 470/950 2
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Absorption Ångström Exponent ; Aethalometer, Black Carbon, Emissions ; Source Apportionment; Fossil-fuel Combustion; Black Carbon Concentrations; Light-absorption; Source Apportionment; Brown Carbon; Optical-properties; Wood Smoke; Elemental Carbon; Fine-particle; Biomass
ISSN (print) / ISBN 2169-897X
e-ISSN 2169-8996
Journal Journal of Geophysical Research - Atmospheres
Quellenangaben Volume: 126, Issue: 10, Pages: , Article Number: e2020JD034094 Supplement: ,
Publisher Wiley
Publishing Place Hoboken, NJ
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Cooperation Group Comprehensive Molecular Analytics (CMA)
Grants HICE - Aerosols and Health -project, a Helmholtz Virtual Institute of Complex Molecular Systems in Environmental Health
Measurement, Monitoring and Environmental Assessment (MMEA)(Tekes)
NABCEA (Novel Assessment of Black Carbon in the Eurasian Arctic - project)(Academy of Finland)
SIMO (Wood combustion simulator) (Regional Council of Pohjois-Savo)
KIUAS - project (Emissions from sauna stoves)
EL-TRAN (Transition to a resource efficient and climate neutral electricity system, Strategic Research Council at the Academy of Finland)
"SEA-EFFECTS BC" (Shipping Emissions in the Arctic, Black Carbon, Business Finland)
CITYZER (Services for effective decision making and environmental resilience, Business Finland) project
Business Finland
BC Footprint project
Tekes