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Analysis of haze events based on satellite remote sensing and field observations: a case study of severe haze pollution over the Yangtze River Delta |
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Abstract A continuous air pollution event occurred in the Yangtze River Delta during from December 1 to 9, 2013. The formation, characteristics and potential sources of this air pollution event were explored by using the aerosol products of MODIS and CALIPSO satellite, ground air quality, meteorological data and HYSPLIT backward trajectory model. The results showed that, the 8 typical cities of the Yangtze River Delta were dominated by the haze pollution during this event. Aerosol optical depth (AOD) increased significantly, air quality index (AQI) reached or was higher than the limit value of pollution, and it is mainly higher than the level of moderate pollution. During the event, the aerosol mainly exist in the level from the ground to 2km above, especially under 850m. Based on volume depolarization ratio and color ratio, the higher frequency of spherical aerosol than that of non-spherical aerosol and the higher frequency of large size aerosol particle than that of small aerosol particle indicated that the main aerosol type was "pollution" aerosol during the pollution event. Short distance transport of pollutants and static weather conditions with continuous low wind speed and no precipitation which made the pollutants difficult to disperse, led to the widespread, long-time and severe pollution event in the Yangtze River delta.
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Received: 07 July 2014
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