Characteristics of chemical components and dry deposition of reactive nitrogen in the Three Gorges Reservoir Region
WANG Huan-bo1,2, SHI Guang-ming1,2, TIAN Mi1,2, QIAO Bao-qing1, PENG Chao1, ZHANG Liu-yi1,3, YANG Fu-mo1,2,3
1. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; 2. Collaborative Innovation Center for Green Development in Wuling Mountain Areas, Yangtze Normal University, Chongqing 408100, China; 3. Chongqing Three Gorges University, Chongqing 404100, China
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.
王欢博, 石光明, 田密, 乔保清, 彭超, 张六一, 杨复沫. 三峡库区大气活性氮组成及干沉降通量[J]. 中国环境科学, 2018, 38(1): 44-50.
WANG Huan-bo, SHI Guang-ming, TIAN Mi, QIAO Bao-qing, PENG Chao, ZHANG Liu-yi, YANG Fu-mo. Characteristics of chemical components and dry deposition of reactive nitrogen in the Three Gorges Reservoir Region. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(1): 44-50.
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