Stable isotope ratio of atmospheric and seawater nitrate in the East Sea in the northwestern Pacific ocean
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 δ...
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Veröffentlicht in: | Marine pollution bulletin 2019-12, Vol.149, p.110610, Article 110610 |
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Sprache: | eng |
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Zusammenfassung: | 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.
•The δ15N-NOx– values reflect the pollution sources for atmospheric NOx− deposition.•Coal combustion in winter and vehicle exhaust in summer were the main NOx− sources.•The effect of NOx– deposition was detected from the seawater NOx– isotope data. |
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ISSN: | 0025-326X 1879-3363 |
DOI: | 10.1016/j.marpolbul.2019.110610 |