Stable isotope ratio of atmospheric and seawater nitrate in the East Sea in the northwestern Pacific ocean

Haryun Kim, Geun Ha Park, Seon Eun Lee, Young il Kim, Kitack Lee, Yeo Hun Kim, Tae Wook Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The nitrogen and oxygen isotopic values of anthropogenic NOx (including NO2 and NO3) are preserved in precipitation and airborne total suspended particles. Hence, isotope analyses of these atmospheric samples allow for the identification of the NOx sources. In this study, atmospheric δ15N- and δ18O-NOx values were measured in an eastern coastal site of South Korea over a three-year period, and compared with seawater values observed from coastal waters of the East Sea. The highest seasonal atmospheric δ15N-NOx values were associated with wintertime air masses blowing from northeastern China, and similar to those produced by coal and biomass burning. By contrast, the lowest atmospheric δ15N-NOx values were observed in summer, and the major source appeared to be vehicle exhaust. In addition, the reductions in the seawater δ15N-NOx and Δ(15−18) (i.e., δ15N-NOx minus δ18O-NOx) values in the East Sea could be at least partially attributed to atmospheric deposition.

Original languageEnglish
Article number110610
JournalMarine Pollution Bulletin
Volume149
DOIs
Publication statusPublished - 2019 Dec

Keywords

  • Anthropogenic nitrogen
  • Atmospheric pollution
  • East Asia
  • Marginal sea
  • Nitrogen and oxygen isotope
  • Ocean nitrogen cycle

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science
  • Pollution

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