阳光驱动淡水和海水中氧化亚氮的非生物形成

IF 45.8 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Science Pub Date : 2025-03-13
Elizabeth Leon-Palmero, Rafael Morales-Baquero, Bo Thamdrup, Carolin Löscher, Isabel Reche
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引用次数: 0

摘要

一氧化二氮(N2O)是一种强有力的温室气体,也是平流层臭氧消耗的主要物质,但其来源尚未得到很好的解决。在这项工作中,我们通过实验展示了一种以前没有在温室气体预算中考虑过的N2O生产途径,我们将其命名为光化学反硝化。在淡水和海水的含氧非生物条件下,阳光诱导大量和一致的N2O生成。我们使用同位素示踪剂测量了光化学N2O的生成速率,并确定亚硝酸盐是主要的底物,硝酸盐在光还原为亚硝酸盐后也可以起作用。此外,N2O的产生与辐射剂量密切相关。光化学反硝化作用在地表水中超过了生物N2O的产生。虽然以前被忽视,但这一过程可能通过其在淡水和海洋地表水中的发生而对全球一氧化二氮排放作出重大贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sunlight drives the abiotic formation of nitrous oxide in fresh and marine waters
Nitrous oxide (N2O) is a potent greenhouse gas and the main stratospheric ozone-depleting agent, yet its sources are not well resolved. In this work, we experimentally show a N2O production pathway not previously considered in greenhouse gas budgets, which we name photochemodenitrification. Sunlight induces substantial and consistent N2O production under oxic abiotic conditions in fresh and marine waters. We measured photochemical N2O production rates using isotope tracers and determined that nitrite is the main substrate and that nitrate can also contribute after being photoreduced to nitrite. Additionally, this N2O production was strongly correlated to the radiation dose. Photochemodenitrification exceeded biological N2O production in surface waters. Although previously overlooked, this process may contribute considerably to global N2O emissions through its occurrence in fresh and marine surface waters.
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来源期刊
Science
Science 综合性期刊-综合性期刊
CiteScore
61.10
自引率
0.90%
发文量
0
审稿时长
2.1 months
期刊介绍: Science is a leading outlet for scientific news, commentary, and cutting-edge research. Through its print and online incarnations, Science reaches an estimated worldwide readership of more than one million. Science’s authorship is global too, and its articles consistently rank among the world's most cited research. Science serves as a forum for discussion of important issues related to the advancement of science by publishing material on which a consensus has been reached as well as including the presentation of minority or conflicting points of view. Accordingly, all articles published in Science—including editorials, news and comment, and book reviews—are signed and reflect the individual views of the authors and not official points of view adopted by AAAS or the institutions with which the authors are affiliated. Science seeks to publish those papers that are most influential in their fields or across fields and that will significantly advance scientific understanding. Selected papers should present novel and broadly important data, syntheses, or concepts. They should merit recognition by the wider scientific community and general public provided by publication in Science, beyond that provided by specialty journals. Science welcomes submissions from all fields of science and from any source. The editors are committed to the prompt evaluation and publication of submitted papers while upholding high standards that support reproducibility of published research. Science is published weekly; selected papers are published online ahead of print.
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