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DOI	10.1016/j.atmosres.2020.105137
	Atmospheric nitrogen deposition and its responses to anthropogenic emissions in a global hotspot region
	Zhang C.-H.; Guo H.-R.; Huang H.; Ma T.-Y.; Song W.; Chen C.-J.; Liu X.-Y.
发表日期	2021
ISSN	0169-8095
卷号	248
英文摘要	Anthropogenic nitrogen (N) emission has been the major cause of rapidly increasing atmospheric N deposition in many regions of the world. However, fluxes, distributions, and physi-chemical compositions of regional N deposition and the response of N deposition levels to N emissions remain poorly characterized, particularly in high N-emission regions. To explore these issues, this study collated observations on N deposition fluxes in the Beijing-Tianjin-Hebei (BTH) region of northern China. We found that total inorganic N (TIN) deposition in the study region averaged 61.3 ± 13 kg-N/ha/yr based on observations from 1998 to 2017. Respectively, about 97%, 73%, 20%, 32%, and 59% of farmland, constructed land, forest, grassland, and water areas had TIN deposition above 50 kg-N/ha/yr. These results indicated substantial ecological risks of atmospheric N loading to these ecosystems. Dry deposition accounted for 59% of TIN deposition and gaseous N accounted for 73% in dry IN deposition. In gaseous N deposition, ammonia, N dioxides, and nitric acid accounted for 42%, 47%, and 11%, respectively. Ratios of NH3-N (N in ammonia) to (NO2-N + HNO3-N) (N in N dioxides, nitric acid) or NH4-N (N in ammonium) to NO3-N (N in nitrate) averaged 0.8, 2.0, 1.0, 1.9, and 1.3 in gaseous, particulate, dry, wet, and total deposition fluxes, respectively. These indicated different transformation and deposition mechanisms between NH4-N and NO3-N under high emissions. Moreover, we found a non-linear relationship between TIN deposition and anthropogenic IN emissions. All these results provide a systematic assessment of the N deposition and its responses to human activities in a high N-emission region, which is valuable for emission mitigation and effect evaluation of regional N pollution. © 2020 Elsevier B.V.
英文关键词	Atmospheric nitrogen deposition; Critical load; Land use; Nitrogen emissions; Terrestrial ecosystems
语种	英语
scopus关键词	Ammonia; Atmospheric chemistry; Ecology; Anthropogenic emissions; Atmospheric nitrogen deposition; Chemical compositions; Deposition fluxes; Deposition mechanism; Emission mitigation; Non-linear relationships; Systematic assessment; Nitric acid; anthropogenic source; atmospheric deposition; atmospheric pollution; emission inventory; global perspective; nitrogen; physicochemical property; policy approach; pollution policy; risk assessment; China; Jingjinji
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141726
作者单位	School of Earth System Science, Tianjin University, Tianjin, 300072, China
推荐引用方式 GB/T 7714	Zhang C.-H.,Guo H.-R.,Huang H.,et al. Atmospheric nitrogen deposition and its responses to anthropogenic emissions in a global hotspot region[J],2021,248.
APA	Zhang C.-H..,Guo H.-R..,Huang H..,Ma T.-Y..,Song W..,...&Liu X.-Y..(2021).Atmospheric nitrogen deposition and its responses to anthropogenic emissions in a global hotspot region.Atmospheric Research,248.
MLA	Zhang C.-H.,et al."Atmospheric nitrogen deposition and its responses to anthropogenic emissions in a global hotspot region".Atmospheric Research 248(2021).