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Organic Nitrogen of Atmospheric Aerosols in the Coastal Area of Seto Inland Sea

Category: Aerosol and Atmospheric Chemistry

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DOI: 10.4209/aaqr.2019.12.0658
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To cite this article:
Nakamura, T., Narita, Y., Kanazawa, K. and Uematsu, M. (2020). Organic Nitrogen of Atmospheric Aerosols in the Coastal Area of Seto Inland Sea. Aerosol Air Qual. Res., doi: 10.4209/aaqr.2019.12.0658.

Tokuhiro Nakamura 1,2, Yasushi Narita3, Keizo Kanazawa2, Mitsuo Uematsu3,4

  • 1 Department of Liberal Arts, College of Bioresource Sciences, Nihon University, Fujisawa-shi, Kanagawa 252-0880, Japan
  • 2 Department of General Education, National Institute of Technology, Kagawa College, Mitoyo-shi, Kagawa 769-1192, Japan
  • 3 International Advanced Research, Center for International Collaboration, Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa-shi, Chiba 277-8564, Japan
  • 4 Center for Environmental Science in Saitama, Kazo-shi, Saitama 347-0115, Japan

Highlights

  • The contribution of ONws to total nitrogen in the aerosols was approximately 10%.
  • One of the sources of ONws could be considered as a combustion.
  • The NO3-N deposition from the atmosphere was the largest among the N compounds.
  • The ONws deposition should be considered in evaluating the effects of N compounds.

Abstract

Chemical compositions and particle number densities of atmospheric aerosols were measured in the coastal area of Seto Inland Sea during the spring of 2015. The mean concentrations of NH4+, NO3-, and water-soluble organic nitrogen (ONws) in the total (fine and coarse) particles were 1.6, 0.85, and 0.28 μg N m-3, respectively. Although NO3- existed in fine and coarse particles, while NH4+ and ONws existed primarily in fine particles. The contribution of ONws to the total nitrogen was approximately 10%, however, these fractions are comparable to the contribution of fine NO3- and coarse NH4+.

The dry deposition fluxes of particulate NH4, NO3-, and ONws were 280, 660 and 83 μg N m-2 day-1, respectively. The dry deposition flux of NO3- was more effective than any other nitrogen compounds, since the deposition rate depends upon the size distribution. The dry deposition flux of ONws was approximately 8.1% of nitrogen compounds, however, it is found that ONws should be considered in evaluating the effects of nitrogen compounds on marine ecosystems.

Keywords

Nitrogen compounds Atmospheric pollutants Atmospheric deposition of nutrients


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