2015~2019年日照市PM<sub>2.5</sub>长期变化特征及其潜在源区分析

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Abstract Based on the hourly data of PM_2.5 concentrations and meteorological elements in Rizhao City during 2015 to 2019, the seasonal characteristics of PM_2.5 and its relationship with wind speed and wind direction were analyzed. Also, the characteristics of sea-land in Rizhao City were summarized. Combined with HYSPLIT model and GDAS data, the 48h backward trajectories of PM_2.5 concentrations at 02:00, 08:00, 14:00 and 20:00 (BTC) every day in five years were calculated. The main transport pathways and potential source contribution of PM_2.5 concentrations in different seasons were discussed by cluster analysis and potential source contribution analysis. The influence of sea-land wind on pollutants in Rizhao City was also analyzed. The results showed that the seasonal characteristics of PM_2.5 concentrations in Rizhao City was the highest in winter and the lowest in summer. The particles concentrations of the monitoring station is higher under the influence of northwest wind. There are differences in the main transport routes in different seasons in Rizhao:in spring, it is mainly affected by the easterly and northerly airflow; in summer, it is mainly affected by the cleaner easterly airflow from the sea under the influence of subtropical high system; in autumn, it is mainly affected by the northwest and easterly airflow; in winter, it is mainly affected by the northwest and northerly airflow. On the whole, the PM_2.5 concentrations of Rizhao City is higher in different seasons affected by the westerly to southerly airflow. The sea-land wind days are more in spring and autumn,less in summer and winter. Under the influence of sea-land wind, the PM_2.5 and ozone pollution in Rizhao City present different distribution characteristics, and under different PM_2.5 pollution levels, the daily variation characteristics of PM_2.5 concentrations are also different from those in normal days.The results show that the main potential source areas of Rizhao are Linyi City, Weifang City, Qingdao city and Lianyungang City of Jiangsu Province.

Key words： PM_2.5 backward trajectory cluster analysis transport pathway potential source

Received: 18 January 2021

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X573

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	Articles by authors
	WANG Zhong-jie
	HUO Juan
	DU Hui-yun
	WANG Da-wei
	LI Jie
	ZHANG Chuan-bing
	ZHANG Tao
	WANG Wei
	WANG Hai-bo
	YANG Wen-yi

Cite this article:

WANG Zhong-jie,HUO Juan,DU Hui-yun等. Long term characteristics and potential sources of PM_2.5 in Rizhao City from 2015 to 2019[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(9): 3969-3980.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I9/3969

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