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- Title
The pathway of aerosol direct effects impact on secondary inorganic aerosol formation.
- Authors
Jiandong Wang; Jia Xing; Shuxiao Wang; Mathur, Rohit; Jiaping Wang; Yuqiang Zhang; Pleim, Jonathan E.; Ding, Dian; Xing Chang; Jingkun Jiang; Peng Zhao; Sahu, Shovan Kumar; Yuzhi Jin; Wong, David C.; Jiming Hao
- Abstract
Airborne aerosols reduce surface solar radiation through light scattering and absorption (aerosol direct effects, ADE), influence regional meteorology, and further affect atmospheric chemical reactions and aerosol concentrations. Several studies have revealed that the inhibition of turbulence and the increase in atmospheric stability induced by ADE increases surface primary aerosol concentration, but the pathway of ADE impacts on secondary aerosol is still unclear. In this study, the two-way coupled WRF-CMAQ with integrated process analysis was applied to explore how ADE impacts secondary aerosol formation through changes in atmospheric dynamics and photolysis processes. Meteorological and air quality fields in Jing-Jin-Ji area (denoted JJJ, including Beijing, Tianjin and Hebei Province in China) in January and July 2013 were simulated to represent winter and summer conditions, respectively. Two pathways of ADE impacts on aerosol concentration, i.e., photolysis modification and atmospheric dynamics modification were estimated separately through scenario analysis. The results show that solar radiation is the restricting factor in winter, and the formation of sulfate is sensitive to the perturbation of solar radiation. While in summer, availability of gaseous precursors primarily dictates the levels of secondary aerosol concentrations. ADE through the attenuation of photolysis inhibits secondary aerosol formation during winter and promotes secondary aerosol formation during summer. The seasonal differences are attributed to change of effective actinic flux in winter and summer determined by aerosol optical depth, solar zenith angles, and single scattering albedo. ADE through dynamic processes is the dominant process influencing surface secondary aerosol formation due to the accumulation of gaseous precursors. Different from sulfate, the surface layer is a net-source of nitrate during winter but a sink during summer. Therefore, ADE promotes nitrate accumulation in winter and reduces nitrate accumulation in summer.
- Subjects
HEBEI Sheng (China); TIANJIN (China); BEIJING (China); AEROSOLS; ATMOSPHERIC circulation; ACTINIC flux; SOLAR radiation; AIR quality; CARBONACEOUS aerosols; TROPOSPHERIC aerosols; ATMOSPHERIC turbulence
- Publication
Atmospheric Chemistry & Physics Discussions, 2022, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2021-906