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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-424
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 May 2018

Research article | 15 May 2018

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.

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

Wen Xu1,2, Lei Liu3, Miaomiao Cheng4, Yuanhong Zhao5, Lin Zhang5, Yuepeng Pan6, Xiuming Zhang7, Baojing Gu7, Yi Li8, Xiuying Zhang3, Jianlin Shen9, Li Lu10, Xiaosheng Luo11, Yu Zhao12, Zhaozhong Feng2, Jeffrey L. Collett Jr.13, Fusuo Zhang1, and Xuejun Liu1 Wen Xu et al.
  • 1College of Resources and Environmental Sciences, Key Laboratory of Plant-Soil Interactions of MOE, Beijing Key Laboratory of Cropland Pollution Control and Remediation, China, Agricultural University, Beijing 100193, China
  • 2State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Shuangqing Road 18, Haidian District, Beijing, 100085, China
  • 3Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, International Institute for Earth System Science, Nanjing Unive rsity, Nanjing, 210023, China
  • 4State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
  • 5Laboratory for Climate and Ocean-Atmosphere Sciences, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China
  • 6State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
  • 7Department of Land Management, Zhejiang University, Hangzhou 310058, People's Republic of China
  • 8Arizona Department of Environmental Quality, Phoenix, AZ 85007, USA
  • 9Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 4410125, China
  • 10Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China
  • 11Institute of Plant Nutrition, Resources and Environmental Sciences, Henan Academy of Agricultural Sciences, Henan Key Laboratory of Agricultural Eco-environment, Zhengzhou, 450002, China
  • 12State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Ave., Nanjing, Jiangsu 210023, China
  • 13Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, 80523, USA

Abstract. Five-year (2011–2015) measurements of gaseous NH3, NO2 and HNO3 and particulate NH4+ and NO3 in air and/or precipitation were conducted at twenty-seven sites in a Nationwide Nitrogen Deposition Monitoring Network (NNDMN) to better understand spatial and temporal (seasonal and annual) characteristics of reactive nitrogen (Nr) concentrations and deposition in eastern China. Our observations reveal annual average concentrations (16.4–32.6μgNm−3), dry deposition fluxes (15.8–31.7kgNha−1yr−1) and wet/bulk deposition fluxes (18.4–28.0kgNha−1yr−1) based on land use were ranked as urban>rural>background sites. Annual concentrations and dry deposition fluxes of each Nr 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 Nr 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 Nr pollution and deposition in the region. Ambient concentrations of total Nr exhibited a non-significant seasonal variation at all land use types, although significant seasonal variations were found for individual Nr species (e.g., NH3, NO2 and pNO3) 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 Nr deposition over eastern China. Our results not only improve the understanding of spatial-temporal variations of Nr 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.

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Our main results demonstrate that atmospheric Nr pollution in eastern China is more serious in the northern region than in the southern region. Any effects of current emission controls are not yet apparent in Nr pollution. NH3 emissions from fertilizer use were the largest contributor (36 %) to total inorganic Nr deposition. Our results provide useful information for policy-makers that mitigation of NH3 emissions should be a priority to tackle serious N deposition.
Our main results demonstrate that atmospheric Nr pollution in eastern China is more serious in...
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