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| Influence of sea breeze on atmospheric pollutant concentration over Tianjin |
| HAO Tian-yi1, CHEN Shu-cheng2, CAI Zi-ying1, SHAN Xiao-lin3, MENG Li-hong4, HAN Su-qin4, DONG Gao-hong1 |
1. Tianjin Environmental Meteorological Centre, Tianjin 300074, China;
2. Tianjin Meteorological Observation Centre, Tianjin 300061, China;
3. Tianjin Binhai New Area Meteorological Bureau, Tianjin 300457, China;
4. Tianjin Institute of Meteorological Science, Tianjin 300074, China |
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Abstract The influence of sea breeze on the concentration of air pollutants in Tianjin was analyzed by using the monitoring data of pollutants concentration, meteorological data and WRF-CHEM model. Research results show that the air quality in the eastern coastal areas of Tianjin was better than that in the west inland and urban center. In the autumn and winter of high pollution weather in Tianjin, sea breeze played a role in reducing the concentration of pollutants. Therefore, the sea breeze was beneficial to reduce the air pollution, and the impact on the concentration of pollutants in the suburbs was relatively obvious. The daily average concentration of pollutants was lower in the presence of sea breeze than that without sea breeze in weak pressure field. The daily average concentration reduction of PM2.5, PM10 and O3 were 14.4μg/m3, 22.9μg/m3 and 8.9μg/m3 respectively. The sea breeze episode in January 4, 2015 shows that the pollutants in the coastal area could be moved to the inland areas by sea breeze front. The pollutants concentration increased slightly in the front of the sea breeze front. When the sea breeze front moved, the pollutants concentration showed a downward trend. As a result of the wider impact of this sea breeze process, air pollution in Tianjin has been eased.
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Received: 23 January 2017
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