Fang L.-J.,Zhoushan Marine Survey and Design Institute |
Fu X.-K.,Zhoushan Marine Survey and Design Institute |
Xie L.-F.,Zhoushan Marine Survey and Design Institute |
Liao W.-M.,Zhoushan Marine Survey and Design Institute |
Yu J.-M.,Zhoushan Marine Survey and Design Institute
Research of Environmental Sciences | Year: 2014
The HYSPLIT- 4 backward trajectory model was used to simulate the atmospheric transport of air pollutants in Zhoushan Island, combining Global Data Assimilation System (GDAS) meteorological data from the National Centers for Environmental Prediction (NCEP) and concentrations of NO2, PM2.5, PM10 and SO2 in April, July, October and December 2012. In addition, the transport pathways and regional sources of atmospheric pollution were identified using cluster analysis. Meanwhile, the potential source contribution function and concentration weighted trajectory combined with weight factors were utilized to calculate regional sources for atmospheric pollution of PM2.5 preliminarily. The results showed that the backward trajectory distributions of air mass flow in Zhoushan Island varied with seasons. The airflow from the Yellow Sea dominated the prevailing wind direction in April, occupying 36.7% of the total trajectories. The mass concentration of PM2.5 was (53.24±24.33) μg/m3. In July, the airflows through the Ryukyu Islands and the East Sea surface were the main transport pathways, accounting for 48.4%. The values of NO2, PM2.5, PM10 and SO2 were (24.63±6.33), (28.60±4.83), (52.89±18.76) and (8.67±3.11) μg/m3, respectively. In October, the prevailing wind direction was dominated by the airflow from the East Sea surface, occupying 49.2%. In December, it was dominated by the airflow from the south of Liaoning Province and the Yellow Sea, accounting for 66.1%. The concentrations of the four pollutants were (28.48±15.14), (58.71±14.10), (69.83±38.94) and (20.83±13.28) μg/m3, respectively. The potential sources of PM2.5 were mainly due to local emissions among the nearby cities, mostly concentrated in Hangzhou Bay, Shanghai and the coastal areas of Zhejiang Province.