气溶胶
空气质量指数
环境科学
硫酸盐
大气科学
相对湿度
臭氧
北京
硝酸盐
环境化学
天气研究与预报模式
CMAQ
气象学
化学
中国
地理
有机化学
考古
地质学
作者
Yan Li,Ling Lu,Jiaxing Sun,Yueqi Gao,Peng Wang,Siyu Wang,Zhaolei Zhang,Aodong Du,Zhijie Li,Yele Sun,Jin Young Kim,Hwajin Kim,Hongliang Zhang,Yele Sun
标识
DOI:10.1021/acs.est.3c02417
摘要
Air quality in China has continuously improved during the Three-Year Action Plan (2018-2020); however, the changes in aerosol composition, properties, and sources in Beijing summer remain poorly understood. Here, we conducted real-time measurements of aerosol composition in five summers from 2018 to 2022 along with WRF-Community Multiscale Air Quality simulations to characterize the changes in aerosol chemistry and the roles of meteorology and emission reductions. Largely different from winter, secondary inorganic aerosol and photochemical-related secondary organic aerosol (SOA) showed significant decreases by 55-67% in summer, and the most decreases occurred in 2021. Comparatively, the decreases in the primary aerosol species and gaseous precursors were comparably small. While decreased atmospheric oxidation capacity as indicated by ozone changes played an important role in changing SOA composition, the large decrease in aerosol liquid water and small increase in particle acidity were critical for nitrate changes by decreasing gas-particle partitioning substantially (∼28%). Analysis of meteorological influences demonstrated clear and similar transitions in aerosol composition and formation mechanisms at a relative humidity of 50-60% in five summers. Model simulations revealed that emission controls played the decisive role in reducing sulfate, primary OA, and anthropogenic SOA during the Three-Year Action Plan, while meteorology affected more nitrate and biogenic SOA.
科研通智能强力驱动
Strongly Powered by AbleSci AI