Brown Carbon in East Asia: Seasonality, Sources, and Influences on Regional Climate and Air Quality

被引:2
作者
Wang, Fan [1 ]
Lu, Zifeng [2 ]
Lin, Guangxing [3 ]
Carmichael, Gregory R. [4 ]
Gao, Meng [1 ]
机构
[1] Hong Kong Baptist Univ, Dept Geog, Hong Kong 999077, Peoples R China
[2] Argonne Natl Lab, Energy Syst & Infrastruct Anal Div, Lemont, IL 60439 USA
[3] Xiamen Univ, Coll Ocean & Earth Sci, Xiamen 361005, Peoples R China
[4] Univ Iowa, Dept Chem & Biochem Engn, Iowa City, IA 52242 USA
来源
ACS ENVIRONMENTAL AU | 2024年 / 5卷 / 01期
基金
中国国家自然科学基金;
关键词
brown carbon; WRF-Chem; light-absorbing aerosol; radiative feedback; meteorology; PM2.5; O-3; BLACK CARBON; LIGHT-ABSORPTION; ORGANIC AEROSOL; OBSERVATIONAL CONSTRAINTS; TOPIC; MODEL; EMISSIONS; POLLUTION; CHINA; PHOTOOXIDATION;
D O I
10.1021/acsenvironau.4c00080
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Brown carbon (BrC) has been recognized as an important light-absorbing carbonaceous aerosol, yet understanding of its influence on regional climate and air quality has been lacking, mainly due to the ignorance of regional coupled meteorology-chemistry models. Besides, assumptions about its emissions in previous explorations might cause large uncertainties in estimates. Here, we implemented a BrC module into the WRF-Chem model that considers source-dependent absorption and avoids uncertainties caused by assumptions about emission intensities. To our best knowledge, we made the first effort to consider BrC in a regional coupled model. We then applied the developed model to explore the impacts of BrC absorption on radiative forcing, regional climate, and air quality in East Asia. We found notable increases in aerosol absorption optical depth (AAOD) in areas with high OC concentrations. The most intense forcing of BrC absorption occurs in autumn over Southeast Asia, and values could reach around 4 W m(-2). The intensified atmospheric absorption modified surface energy balance, resulting in subsequent declines in surface temperature, heat flux, boundary layer height, and turbulence exchanging rates. These changes in meteorological variables additionally modified near-surface dispersion and photochemical conditions, leading to changes of PM2.5 and O-3 concentrations. These findings indicate that BrC could exert important influence in specific regions and time periods. A more in-depth understanding could be achieved later with the developed model.
引用
收藏
页码:128 / 137
页数:10
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