海洋N2O氮、氧同位素组成研究进展

氧化亚氮（N₂O）不仅是重要的温室气体之一，还对臭氧层具有破坏作用。由于人为活动加剧，导致大气N₂O浓度以每年约0.25%的速率增加。海洋是大气N₂O的重要释放源。海洋溶存N₂O的氮、氧同位素组成可以反映N₂O的源与汇以及N₂O的形成机制，是海洋氮循环过程研究的一个重要示踪指标。本文简述海洋N₂O产生和消耗机制，总结不同环境中N₂O稳定氮、氧同位素组成和N₂O循环过程的同位素分馏效应，并回顾了国际上应用稳定氮、氧同位素研究海洋N₂O形成机制的研究进展，最后评述我国近海N₂O稳定氮、氧同位素研究现状并提出展望。

Research progress in nitrogen and oxygen isotopic composition of marine nitrous oxide

Nitrous oxide (N₂O) is an important greenhouse gas, and plays a significant role in the stratospheric ozone depletion. Atmospheric N₂O concentration has been increasing at an annual rate of 0.25%, primarily due to human activities. Marine waters are the major hotspot of N₂O production. The nitrogen and oxygen isotope of N₂O are tracers for the production and consumption of N₂O in the ocean, which is a useful tool for marine N₂O cycle study. Herein, we present a brief review of marine N₂O production and consumption in the context of the nitrogen cycle. Then nitrogen and oxygen isotopic composition of N₂O in different environment and the isotopic fractionation effect on N₂O cycle were summarized. Current applications of nitrogen and oxygen isotope in the associated processes of N₂O in the marine systems were reviewed. Finally, we commented the current status and perspective of applying nitrogen and oxygen isotope in the N₂O cycle in the coastal China Sea.