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Seasonal variations in the sources of organic aerosol in Xi'an, Northwest China: The importance of biomass burning and secondary formation
- Source :
- The Science of the total environment. 737
- Publication Year :
- 2020
-
Abstract
- The Guanzhong basin is a part of the three top priority regions in China's blue sky action as of 2019. Understanding the chemical composition, sources, and atmospheric process of aerosol in this region is therefore imperative for improving air quality. In this study, we present, for the first time, the seasonal variations of organic aerosol (OA) in Xi'an, the largest city in the Guanzhong basin. Biomass burning OA (BBOA) and oxidized OA (OOA) contributed >50% of OA in both autumn and winter. The average concentrations of BBOA in autumn (14.8 ± 5.1 μg m-3) and winter (11.6 ± 6.8 μg m-3) were similar. The fractional contribution of BBOA to total OA, however, decreased from 31.9% in autumn to 15.3% in winter, because of enhanced contributions from other sources in winter. The OOA fraction in OA increased largely from 20.9% in autumn to 34.9% in winter, likely due to enhanced emissions of precursors and stagnant meteorological conditions which facilitate the accumulation and secondary formation. A large increase in OOA concentration was observed during polluted days, by a factor of ~4 in autumn and ~6 in winter compared to clean days. In both seasons, OOA formation was most likely dominated by photochemical oxidation when aerosol liquid water content was
- Subjects :
- Pollution
Environmental Engineering
010504 meteorology & atmospheric sciences
media_common.quotation_subject
Air pollution
010501 environmental sciences
Seasonality
Particulates
medicine.disease_cause
medicine.disease
01 natural sciences
Aerosol
Environmental chemistry
medicine
Environmental Chemistry
Environmental science
Waste Management and Disposal
Chemical composition
Air quality index
Water content
0105 earth and related environmental sciences
media_common
Subjects
Details
- ISSN :
- 18791026
- Volume :
- 737
- Database :
- OpenAIRE
- Journal :
- The Science of the total environment
- Accession number :
- edsair.doi.dedup.....1d8013342b4fabc2e4a433930c397ef2