Review of the Study on the Stable Isotopes of Nitrogen and Oxygen in Atmospheric Nitrate |
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| Authors: | Rui Qin Guitao Shi Zhenlou Chen |
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| Institution: | 1. Key Laboratory of Geographic Information Science Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai 200241, China |
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| Abstract: | Due to the emissions from intensive human activities and rapid development of industry and agriculture, atmospheric nitrate (NO ) contamination is becoming more serious and now is a worldwide environmental problem. The isotopic compositions of NO (δ15N, δ18O and Δ17O) can deliver more information than the concentration alone, i.e., the nitrogen and oxygen isotopes can suggest the sources of NO and oxidation capability of the atmosphere, providing a powerful tool for investigating atmospheric nitrogen cycling and atmospheric NO pollution control. The δ15N of different sourced NO in the atmosphere, as well as the seasonal variation of δ15N (NO ) and the associated mechanisms were reviewed. In addition, the oxygen isotopes of various oxidants and NO (δ18O and Δ17O) in the atmosphere were summarized, and the global distribution patterns of the oxygen isotopes of NO were discussed. Lastly, the available analysis techniques of isotopic compositions of NO were reviewed. Based on the research progress of NO isotopes in the atmosphere, it was suggested that further investigations should focus on measuring the isotopic compositions of oxidants and NOx from different sources, characterizing the production mechanisms of NO , as well as investigating chemical recycling between NOx and NO with the aid of atmospheric chemical models. |
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| Keywords: | Atmosphere Nitrate Stable isotopes |
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