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| Numerical simulations of sources and transport pathways of different PM2.5 pollution types in Shanghai |
| YU Zhong-qi1,2, MA Jing-hui1,2, CAO Yu1,2, CHANG Lu-yu1,2, XU Jian-ming1,2, ZHOU Guang-qiang1,2 |
1. Yangtze River Delta Center for Environmental Meteorology Prediction and Warning, Shanghai 200030, China;
2. Shanghai Key Laboratory of Meteorology and Health, Shanghai Meteorological Service, Shanghai 200030, China |
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Abstract Synoptic weather patterns during the moderate and severe PM2.5 pollution processes in Shanghai from 2014 to 2017 were analyzed in the paper. The pollution processes were classified into 3types, i.e., the transport type, the stagnant type and the combined type. The severe PM2.5 pollution events in Shanghai were mostly dominated by the transport type, accounting for 45.8% of total severe pollution events. The FLEXPART model driven by the WRF model with MEIC emissions was used to investigate the meteorological attribution and maintenance mechanisms of air pollution under each weather pattern in this paper. Specifically, the transport type showed 3main pollution transport pathways affected Shanghai, i.e., the eastern pathway (the East China Sea), the middle pathway (Jiangsu coastal area) and the western pathway (Anhui-southern Jiangsu), which mainly occurred 1d before pollution. The stagnant type showed pollution potential source area in Shanghai and its surrounding regions. The combined type showed both apparent transport pathways and potential source area in and nearby Shanghai.
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Received: 22 June 2018
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