三峡库区大气活性氮组成及干沉降通量

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Abstract To understand the chemical components of reactive nitrogen and estimate their dry deposition flux in the Three Gorges Reservoir Region, gaseous and particulate nitrogen species were collected at urban Wanzhou in each season in 2015. Dry deposition flux was estimated using the inferential method with modelled dry deposition velocities and measured ambient concentrations, which was obtained from the big-leaf resistance model and ion chromatography, respectively. HNO₃ had the highest dry deposition velocity among all the reactive nitrogen species, with an annual mean value of 0.39cm/s, which was around 3~8 times higher than other nitrogen species. NO₂ and NH₃ were both important nitrogen forms, with an annual mean concentration of (11.7±3.9) and (11.0±5.3) μg N/m³, respectively, and together contributing around 80% of the total inorganic nitrogen concentrations. Furthermore, the dry deposition fluxes of oxidized nitrogen (NO₂, HNO₃ and particulate NO₃^-) and reduced nitrogen (NH₃ and particulate NH₄⁺) were 3.5 and 5.0kg N/(hm²·a), accounting for 41.4% and 58.6% of the total inorganic nitrogen dry deposition flux, respectively. Therefore, in order to reduce the nitrogen pollution efficiently in the Three Gorges Reservoir Region, it is key to control NH₃ emission.

Key words： atmospheric reactive nitrogen dry deposition dry deposition velocity Three Gorges Reservoir Region

Received: 06 June 2017

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X51

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	Articles by authors
	WANG Huan-bo
	SHI Guang-ming
	TIAN Mi
	QIAO Bao-qing
	PENG Chao
	ZHANG Liu-yi
	YANG Fu-mo

Cite this article:

WANG Huan-bo,SHI Guang-ming,TIAN Mi等. Characteristics of chemical components and dry deposition of reactive nitrogen in the Three Gorges Reservoir Region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(1): 44-50.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2018/V38/I1/44

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