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

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Journal of Environmental Sciences 2022年第4期34卷 444-453页

作者： Shuidi He Minjuan Huang Lianming Zheng Ming Chang Weihua Chen Qianqian Xie Xuemei Wang Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality Institute for Environmental and Climate ResearchJinan UniversityGuangzhou 510632China School of Atmospheric Sciences Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSun Yat-sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519082China

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)value>0.3 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.

关键词： Inorganic nitrogen(IN) Wet deposition Seasonal variation Transport pathways Potential source areas emission sectors

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

Seasonal variation of transport pathways and potential sourc...

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第二十五届大气污染防治技术研讨会

作者： Shuidi He Minjuan Huang Lianming Zheng Ming Chang Weihua Chen Qianqian Xie Xuemei Wang Institute for Environmental and Climate Research Jinan University School of Atmospheric Sciences Sun Yat-Sen University Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Education Southern Marine Science and Engineering Guangdong Laboratory

Inorganic nitrogen (IN) deposition in China is among the highest in the world. This study attempts to identify the dominant transport pathways,potential source areas,and their seasonal variation at sites with high 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. The average annual fluxes measured at both sites (GZ: 33.04±9.52 kg N ha yr,DHS: 20.52±10.22 kg N ha yr) were higher,while the NH-N/NO--N ratios (R) (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 flux in the wet season (GZ: 26.74 ±7.63 kg N ha yr,DHS: 13.46±6.60 kg N ha yr) was significantly higher than the dry season (GZ: 6.30±3.9 kg N ha yr,DHS: 7.06±3.83 kg N ha yr);however,no significant variation of R was observed between seasons. 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 (N and NNE) in the dry season and in the south and east (ESE,E,and SSW) in the wet season. A WPSCF value > 0.3 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%) than the wet season. 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.

关键词： Inorganic nitrogen （IN） wet deposition Seasonal variation Transport pathways Potential source area emission sectors

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