Sources of black carbon at residential and traffic environments obtained by two source apportionment methods
نویسندگان
چکیده
Abstract. This study investigated the sources of black carbon (BC) at two contrasting urban environments in Helsinki, Finland: residential area and street canyon. The measurement campaign was conducted winter–spring 2019, whereas canyon measurements were carried out autumn 2015. BC explored by using positive matrix factorization (PMF) for organic refractory (rBC) mass spectra collected with a soot particle aerosol spectrometer (SP-AMS). Based on PMF analysis, sites had different local sources; largest fraction originated from biomass burning site (38 %) vehicular emissions (57 %). Also, size distribution diverged as traffic found ?100–150 nm combustion detected ?300 nm. At both sites, large associated background or long-range-transported indicated high oxidation state organics related to those factors. results analysis compared source apportionment Aethalometer model calculated pairs absorption Ångström values. It that several factors can be attributed wood fossil fuel provided model. In general, showed less variation between within day than PMF, indicating it responsive fast changes site, could not distinguish many due similar optical properties sources. this increase understanding limitations validity methods environments. Moreover, advances current knowledge especially contribution areas.
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ژورنال
عنوان ژورنال: Atmospheric Chemistry and Physics
سال: 2021
ISSN: ['1680-7316', '1680-7324']
DOI: https://doi.org/10.5194/acp-21-14851-2021