Impacts of anthropogenic aerosols on fog in North China Plain
[1];
[2];
[5]
- Chinese Meteorological Administration, Beijing (China). Inst. of Urban Meteorology; Brookhaven National Lab. (BNL), Upton, NY (United States); Nanjing Univ. of Information Science and Technology (China). Key Lab. of Materials-Oriented Chemical Engineering (MCE)of Aerosol-Cloud-Precipitation of China Meteorological Administration
- Chinese Meteorological Administration, Beijing (China). Inst. of Urban Meteorology
- Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Atmospheric Physics
- Beijing Weather Modification Office, Beijing (China); Beijing Key Lab. of Cloud, Precipitation and Atmospheric Water Resources, Beijing (China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
Fog poses a sever environmental problem in the North China Plain (NCP), China, which has been witnessing increases anthropogenic emission since the early 1980s. Here, this work first uses the WRF/Chem model coupled with the local anthropogenic emissions to simulate and evaluate a severe fog event occurring in NCP. Comparison of the simulations against observations shows that WRF/Chem well reproduces the general features of temporal evolution of PM2.5 mass concentration, fog spatial distribution, visibility, and vertical profiles of temperature, water vapor content and relative humidity in the planetary boundary layer throughout the whole period of the fog event. Sensitivity studies are then performed with five different levels of anthropogenic emission as model inputs to systematically examine the comprehensive impacts of aerosols on fog microphysical, macrophysical, radiative, and dynamical properties. The results show that as aerosol concentration increases, fog droplet number concentration and liquid water content all increase nonlinearly; but effective radius decreases. Macrophysical properties (fog fraction, fog duration, fog height, and liquid water path) also increase nonlinearly with increasing aerosol concentration, with rates of changes smaller than microphysical properties. Further analysis reveals distinct aerosol effects on thermodynamic and dynamical conditions during different stages of fog evolution: increasing aerosols invigorate fog formation and development by enhancing longwave-induced instability, fog droplet condensation accompanying latent heat release, and thus turbulence, but delay fog dissipation by reducing surface solar radiation, surface sensible and latent heat fluxes, and thus suppressing turbulence during the dissipation stage.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NNSFC); USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1484868
- Report Number(s):
- BNL--209645-2018-JAAM
- Journal Information:
- Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 1 Vol. 124; ISSN 2169-897X
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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