珠江三角洲地区冬季硫、氮干沉降的来源解析

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Abstract The WRF-CMAQ modelling system was used to simulate dry deposition of S and N in the Pearl River Delta (PRD) region in January 2015, and CMAQ Integrated Source Apportionment Method (CMAQ-ISAM) was utilized to investigate their source apportionment. The results indicated that the high levels of dry deposition of S and N were occurred mainly in the junction of Guangzhou and Foshan and Pearl River Estuary (PRE). Their daily variation trend was mainly affected by mass concentration, but it was also significantly affected by dry deposition velocity during certain periods. The contribution of local source to dry deposition of S in PRD was 36.2%, which was the same as mass concentration of S. The contribution of local source would increase with the increasing of SO₂ dry deposition velocity and the weakening of background wind field. The contribution of local source to dry deposition of N in PRD was 32.4%, which was much less than that of mass concentration of S. The contributions of local source would increase with the reducing of mass concentration and dry deposition of HNO₃. In Guangzhou, the contributions of local source to dry deposition of S and N were 27.7% and 14.2%, respectively. In Jiangmen, the contributions of local source to dry deposition of S and N were 9.6% and 8.8%, respectively. Guangzhou was mainly affected by local pollutants compared to Jiangmen, which was affected basically by pollutants transportation from Guangzhou and Foshan. When the background wind field was weakened, the contribution of local source in Jiangmen increased significantly.

Key words： Pearl River Delta dry deposition of sulfur and nitrogen CMAQ-ISAM

Received: 26 April 2020

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	Articles by authors
	SHEN Ao
	ZHOU Hui-xian
	FAN Qi
	TIAN Chun-yan
	CHANG Ming
	WANG Xue-mei

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SHEN Ao,ZHOU Hui-xian,FAN Qi等. Source apportionment to dry deposition of sulfur and nitrogen in winter in the Pearl River Delta region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5142-5151.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I12/5142

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