Abstract
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.
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