Global mapping of flux and microbial sources for oceanic N2O

IF 14.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2025-04-08 DOI:10.1038/s41467-025-58715-4

Shuo Wang, Jilin Huang, Zhen Wu, Shengjie Li, Xianfang Zhu, Yong Liu, Guodong Ji

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Abstract

The ocean is the largest source of N₂O emissions from global aquatic ecosystems. However, the N₂O production–consumption mechanism and microbial spatial distribution are still unclear. Our study established a bottom-up model based on the source‒sink boundary and the microbial sources of N₂O. A high-resolution (0.1°) global distribution of oceanic N₂O was depicted, confirmed by approximately 150,000 surface measurements. The microbial N₂O flux is 2.9 Tg/yr N-N₂O, with the oxygen-deficient zones (ODZs) disproportionately accounting for more than half of the total emission. High primary productivity, sharp oxyclines, and shallow emission depths caused the ODZs to be N₂O hotspots. Geographically, ammonia-oxidizing archaea (AOA, 1.0 Tg) are the most widely distributed contributors to N₂O emissions in the ocean, completely overtaking ammonia-oxidizing bacteria (AOB). Heterotrophic denitrification, mainly occurring in ODZs, contributes the most (1.6 Tg) to N₂O emissions. Overall, this study offers a bottom-up framework for understanding microbial source-sink mechanism in the ocean.

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海洋是全球水生生态系统最大的一氧化二氮排放源。然而，N2O 的产生-消耗机制和微生物空间分布仍不清楚。我们的研究建立了一个基于源-汇边界和 N2O 微生物源的自下而上的模型。该模型描绘了高分辨率（0.1°）的全球海洋一氧化二氮分布，并得到了约 15 万个地表测量数据的证实。微生物 N2O 通量为 2.9 吨/年 N-N2O，其中缺氧区（ODZs）占总排放量的一半以上。高初级生产力、急剧的富氧线和较浅的排放深度使缺氧区成为 N2O 热点。从地理分布上看，氨氧化古细菌（AOA，1.0 Tg）是海洋中 N2O 排放分布最广的贡献者，完全超过了氨氧化细菌（AOB）。主要发生在 ODZs 的异养反硝化作用对 N2O 排放的贡献最大（1.6 Tg）。总之，这项研究为了解海洋微生物源汇机制提供了一个自下而上的框架。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.