Seasonal variation of transport pathways and potential source areas at high inorganic nitrogen wet deposition sites in southern China

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

作者机构：Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental QualityInstitute for Environmental and Climate ResearchJinan UniversityGuangzhou 510632China School of Atmospheric SciencesGuangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSun Yat-sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong LaboratoryZhuhai 519082China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第4期

页      面：444-453页

核心收录：

学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 0833[工学-城乡规划学] 

基　　金：supported by National Key Research and Development Plan(No.2017YFC0210100) the National Natural Science Foundation of China(Nos.41905086,41905107,42077205,41425020) the Special Fund Project for Science and Technology Innovation Strategy of Guangdong Province(No.2019B121205004) the Natural Science Foundation of Guangdong Province(No.2019A1515011291) the China Postdoctoral Science Foundation(No.2020M683174) the Air Quip(High resolution Air Quality Information for Policy)Project funded by the Research Council of Norway,the Collaborative Innovation Center of Climate Change,Jiangsu province,China,the high-performance computing platform of Jinan University,the Mt.Dinghu Forest Ecosystem Research Station,Chinese Academy of Sciences(CAS) the Comprehensive Observation and Study Site of Urban Meteorology and Environment,Sun Yat-sen University,and the Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies(No.2020B1212060025) 

主　　题：Inorganic nitrogen(IN) Wet deposition Seasonal variation Transport pathways Potential source areas Emission sectors 

摘      要：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 national 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 northnortheast in the dry season and in the east-southeast,east,and south-southwest in the wet season.A weighted potential source contribution function(WPSCF)value0.3 was determined reasonably to define the potential source area.Emission within the PRD region contributed 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.