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Characteristics and source apportionment of black carbon aerosol in the North China Plain.
- Source :
-
Atmospheric Research . Oct2022, Vol. 276, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- In this study, the physical properties of refractory BC (rBC) including mass concentration, core size distribution and mixing state were in-situ characterized with a single particle soot photometer (SP2) at a polluted rural site in the North China Plain in November 2018. The average rBC mass concentration is 4.12 ± 2.47 μg m−3, accounting for 6.26% of PM 1 mass. Its diurnal variation shows that the rBC concentration is affected by both the local residential activities and the evolution of planetary boundary layer (PBL). And a broader rBC core mass size distribution (CMSD) can be observed in the afternoon. The CMSD show a primary mode with peak diameter (D m) of ~222 nm, and a small secondary mode with D m of ~687 nm. The average absolute coating thickness (ACT) of rBC particles is 50 nm and the bulk relative coating thickness (BRCT) is about 1.7, indicating a relatively high aging level of rBC. The correlation analysis between SP2-separated rBC and PMF-separated OA factors indicate that rBC with different core size (D c) and ACT may be originated from different sources. The rBC contributed by coal combustion is distributed throughout a large D c range (~70–500 nm). The rBC particles emitted by traffic sources have small core sizes and thin coating thickness (D c < 180 nm and ACT <50 nm); while the rBC particles emitted from biomass burning show a higher degree of aging (ACT >250 nm). In addition, the secondary mode of rBC particles are likely to be originated from coal combustion. • High concentration of rBC with relatively high aging level was observed in the North China Plain • The rBC core mass size distribution was bimodal distribution with a small secondary mode at ~687 nm • The secondary mode of rBC was likely to be contributed by coal combustion [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01698095
- Volume :
- 276
- Database :
- Academic Search Index
- Journal :
- Atmospheric Research
- Publication Type :
- Academic Journal
- Accession number :
- 157386200
- Full Text :
- https://doi.org/10.1016/j.atmosres.2022.106246