Source apportionment to dry deposition of sulfur and nitrogen in winter in the Pearl River Delta region
SHEN Ao1,2, ZHOU Hui-xian1,2, FAN Qi1,2, TIAN Chun-yan1,2, CHANG Ming3, WANG Xue-mei3
1. Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275, China; 2. Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519082, China; 3. Institute for Environmental and Climate Research, Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Jinan University, Guangzhou 511443, China
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.
沈傲, 周慧娴, 樊琦, 田春艳, 常鸣, 王雪梅. 珠江三角洲地区冬季硫、氮干沉降的来源解析[J]. 中国环境科学, 2020, 40(12): 5142-5151.
SHEN Ao, ZHOU Hui-xian, FAN Qi, TIAN Chun-yan, CHANG Ming, WANG Xue-mei. Source apportionment to dry deposition of sulfur and nitrogen in winter in the Pearl River Delta region. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5142-5151.
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