大气硝酸盐中氮氧稳定同位素研究进展

Due to the emissions from intensive human activities and rapid development of industry and agriculture，atmospheric nitrate （NO^-₃） contamination is becoming more serious and now is a worldwide environmental problem. The isotopic compositions of NO^-₃（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^-₃ and oxidation capability of the atmosphere，providing a powerful tool for investigating atmospheric nitrogen cycling and atmospheric NO^-₃ pollution control. The δ¹⁵N of different sourced NO^-₃ in the atmosphere，as well as the seasonal variation of δ¹⁵N（NO^-₃）and the associated mechanisms were reviewed. In addition，the oxygen isotopes of various oxidants and NO^-₃（δ¹⁸O and Δ¹⁷O）in the atmosphere were summarized，and the global distribution patterns of the oxygen isotopes of NO^-₃ were discussed. Lastly，the available analysis techniques of isotopic compositions of NO^-₃ were reviewed. Based on the research progress of NO^-₃ 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^-₃，as well as investigating chemical recycling between NOx and NO^-₃ with the aid of atmospheric chemical models.