Characterizing winter-time brown carbon: Insights into chemical and light-absorption properties in residential and traffic environments

被引：0
作者：
Barreira, Luis M.F. [1 ]
Aurela, Minna [1 ]
Saarikoski, Sanna [1 ]
Li, Delun [1 ]
Teinilä, Kimmo [1 ]
Virkkula, Aki [1 ]
Niemi, Jarkko V. [2 ]
Manninen, H.E. [2 ]
Pirjola, Liisa [3 ,5 ]
Petäjä, Tuukka [5 ]
Rönkkö, Topi [4 ]
Timonen, Hilkka [1 ]
机构：
[1] Atmospheric Composition Research, Finnish Meteorological Institute, Helsinki
[2] Helsinki Region Environmental Services Authority, Helsinki
[3] Department of Automotive and Mechanical Engineering, Metropolia University of Applied Sciences, Vantaa
[4] Aerosol Physics Laboratory, Physics Unit, Faculty of Engineering and Natural Sciences, Tampere University, Tampere
[5] Institute for Atmospheric and Earth System Research (INAR), Faculty of Science, University of Helsinki
来源：
Science of the Total Environment | 2024年 / 955卷
基金：
芬兰科学院; 欧盟地平线“2020”;
关键词：
Brown carbon; Chemical properties; Light absorption; Northern latitudes; Source apportionment; Wintertime air quality;
D O I：
10.1016/j.scitotenv.2024.177089
中图分类号：
学科分类号：
摘要：
Brown carbon (BrC) is an organic aerosol (OA) component that possesses light-absorbing properties in the UV–Vis spectrum, impacting climate. However, the current understanding of climate repercussions stemming from BrC emissions remains insufficient due to a lack of comprehensive knowledge regarding its chemical makeup, light-absorption, and the role of atmospheric aging in shaping BrC properties. This study investigates BrC in PM1 (particulate matter < 1 μm) during winter in Helsinki, Finland, in a street canyon and a residential area with wood combustion. The aim was to ascertain BrC sources, chemical composition, and contribution to UV–Vis light absorption. The study utilized a seven-wavelength aethalometer (AE33) to measure black carbon (BC) and BrC light absorptions, and a soot particle aerosol mass spectrometer (SP-AMS) to determine OA composition. An OA source apportionment using positive matrix factorization followed by a multiple regression analysis between BrC absorption and each factor was performed to determine the mass absorption coefficients of BrC (MACBrC) and light absorption contributions of distinct sources across 370–660 nm wavelengths. The BrC UV–Vis absorption relative to the one of BC was higher at 370 nm, with a median contribution of 20.1 % in the residential area and 18.2 % at the traffic site. Residential BrC absorption showed sporadic peaks, while street canyon absorption was lower but consistent. MACBrC was higher for biomass burning organic aerosol but still significant for long-range transported (LRT) and traffic-related aerosols. Hydrocarbon-like organic aerosol exhibited higher MACBrC at 470 nm than at 370 nm. Combined with particulate mass concentrations, biomass burning and LRT contributed the most to light absorption. Uncertainties regarding MACBrC were evaluated. The chemical composition analysis revealed stronger correlations between BrC absorption and SP-AMS-measured ions, especially in residential areas and for polycyclic aromatic hydrocarbons and oxidized aromatics. The study emphasizes the importance of anthropogenic sources in BrC light absorption. © 2024 The Authors
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