This study attempts to identify the dominant transport pathways,potential source areas,and their seasonal variation at sites with high inorganic nitrogen(IN)wet deposition flux in southern China.This is a long-term study(2010-2017)based on continuous deposition measurements at the Guangzhou urban site(GZ)and the Dinghushan Natural Reserve site(DHS)located in the Pearl River Delta(PRD)region.A dataset on monthly IN concentration in precipitation and wet deposition flux were provided.The average annual fluxes measured at both sites(GZ:33.04±9.52,DHS:20.52±10.22 kg N/(ha·year))were higher,while the ratios of reduced to oxidized N(GZ:1.19±0.77,DHS:1.25±0.84)were lower compared with the na-tional mean level and the previous reported level throughout the PRD region.The dominant pathways were not always consistent with the highest proportional trajectory clusters.The transport pathways contributing most of deposition were identified in the north and north-northeast in the dry season and in the east-southeast,east,and south-southwest in the wet season.A weighted potential source contribution function(WPSCF)value＞0.3 was deter-mined reasonably to define the potential source area.Emission within the PRD region con-tributed the majority(≥95％at both sites)of the IN deposition in the wet season,while the contribution outside the region increased significantly in the dry season(GZ:27.86％,DHS:95.26％).Our results could help create more effective policy to control precursor emissions for IN fluxes,enabling reduction of the ecological risks due to excessive nitrogen.

Shuidi He;Minjuan Huang;Lianming Zheng;Ming Chang;Weihua Chen;Qianqian Xie;Xuemei Wang

Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality,Institute for Environmental and Climate Research,Jinan University,Guangzhou 510632,China;School of Atmospheric Sciences,Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies,Sun Yat-sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519082,China

环境科学学报（英文版）

[1]Shuidi He;Minjuan Huang;Lianming Zheng;Ming Chang;Weihua Chen;Qianqian Xie;Xuemei Wang-.Seasonal variation of transport pathways and potential source areas at high inorganic nitrogen wet deposition sites in southern China)[J].环境科学学报（英文版）,2022(04):444-453

Dinghushan

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