Abstract
An intensive sampling campaign of airborne fine particles (PM2.5) was conducted at Sanya, a coastal city in Southern China, from January to February 2012. Chemical analyses and mass reconstruction were used identify potential pollution sources and investigate atmospheric reaction mechanisms. A thermodynamic model indicated that low ammonia and high relative humidity caused the aerosols be acidic and that drove heterogeneous reactions which led to the formation of secondary inorganic aerosol. Relationships among neutralization ratios, free acidity, and air-mass trajectories suggest that the atmosphere at Sanya was impacted by both local and regional emissions. Three major transport pathways were identified, and flow from the northeast (from South China) typically brought the most polluted air to Sanya. A case study confirmed strong impact from South China (e.g., Pearl River Delta region) (contributed 76.8% to EC, and then this result can be extended to primary pollutants) when the northeast winds were dominant. The Weather Research Forecasting Black carbon model and trace organic markers were used to apportion local pollution versus regional contributions. Results of the study offer new insights into the atmospheric conditions and air pollution at this coastal city.
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This research is supported by the project from the “Strategic Priority Research Program” of the Chinese Academy of Science (Grant No. XDB05060500) and the project from Ministry of Science and Technology (2013FY112700). It is also supported by the Natural Science Foundation of Hainan Province, China (Grant No. 417151), The Doctoral Scientific Research Foundation of Hainan Tropical Ocean University (Grant No. RHDXB201613), Educational Reform of Hainan Tropical Ocean University (Grant No. RDJGb2016-18), and Key Discipline Construction Program of Hainan Provincial Department of Education (Marine Geology-2017).
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Zhou, J., Ho, S.S.H., Cao, J. et al. Chemical characterization of PM2.5 from a southern coastal city of China: applications of modeling and chemical tracers in demonstration of regional transport. Environ Sci Pollut Res 25, 20591–20605 (2018). https://doi.org/10.1007/s11356-018-2238-1
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DOI: https://doi.org/10.1007/s11356-018-2238-1