Spatial-temporal patterns of inorganic nitrogen air concentrations and deposition in eastern China

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Spatial-temporal patterns of inorganic nitrogen air concentrations and deposition in eastern China
	Xu, Wen; Liu, Lei; Cheng, Miaomiao; Zhao, Yuanhong; Zhang, Lin; Pan, Yuepeng; Zhang, Xiuming; Gu, Baojing; Li, Yi; Zhang, Xiuying
刊名	ATMOSPHERIC CHEMISTRY AND PHYSICS
	2018-08-06
卷号	18 期号:15 页码:10931-10954
ISSN号	1680-7316
文献子类	Article
英文摘要	Five-year (2011-2015) measurements of gaseous NH3, NO2, and HNO3 and particulate NH4+ and NO3- in air and/or precipitation were conducted at 27 sites in the Nationwide Nitrogen Deposition Monitoring Network (NNDMN) to better understand spatial and temporal (seasonal and annual) characteristics of reactive nitrogen (N-r) concentrations and deposition in eastern China. Our observations reveal annual average concentrations (16.4-32.6 mu g Nm(-3)), dry deposition fluxes (15.8-31.7 kg N ha(-1) yr(-1)), and wet/bulk deposition fluxes (18.4-28.0 kg N ha(-1) yr(-1)) based on land use, ranked as urban > rural > background sites. Annual concentrations and dry deposition fluxes of each N-r species in air were comparable at urban and background sites in northern and southern regions, but were significantly higher at northern rural sites. These results, together with good agreement between spatial distributions of NH3 and NO2 concentrations determined from ground measurements and satellite observations, demonstrate that atmospheric Nr pollution is heavier in the northern region than in the southern region. No significant inter-annual trends were found in the annual N-r dry and wet/bulk N deposition at almost all of the selected sites. A lack of significant changes in annual averages between the 2013-2015 and 2011-2012 periods for all land use types suggests that any effects of current emission controls are not yet apparent in N-r pollution and deposition in the region. Ambient concentrations of total Nr exhibited non-significant seasonal variation at all land use types, although significant seasonal variations were found for individual Nr species (e.g. NH3, NO2, and pNO(3)(-)) in most cases. In contrast, dry deposition of total Nr exhibited a consistent and significant seasonal variation at all land use types, with the highest fluxes in summer and the lowest in winter. Based on sensitivity tests by the GEOS-Chem model, we found that NH3 emissions from fertilizer use (including chemical and organic fertilizers) were the largest contributor (36 %) to total inorganic N-r deposition over eastern China. Our results not only improve the understanding of spatial-temporal variations of N-r concentrations and deposition in this pollution hotspot, but also provide useful information for policy-makers that mitigation of NH3 emissions should be a priority to tackle serious N deposition in eastern China.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/40667]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Xu, Wen,Liu, Lei,Cheng, Miaomiao,et al. Spatial-temporal patterns of inorganic nitrogen air concentrations and deposition in eastern China[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(15):10931-10954.
APA	Xu, Wen.,Liu, Lei.,Cheng, Miaomiao.,Zhao, Yuanhong.,Zhang, Lin.,...&Liu, Xuejun.(2018).Spatial-temporal patterns of inorganic nitrogen air concentrations and deposition in eastern China.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(15),10931-10954.
MLA	Xu, Wen,et al."Spatial-temporal patterns of inorganic nitrogen air concentrations and deposition in eastern China".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.15(2018):10931-10954.