Biological nitrous oxide consumption in oxygenated waters of the high latitude Atlantic Ocean
Biological nitrous oxide consumption in oxygenated waters of the high latitude Atlantic Ocean
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DOI：
10.1038/s43247-021-00104-y
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发表时间：
2021-02
影响因子：
7.9
通讯作者：
A. Rees;I. Brown;A. Jayakumar;G. Lessin;P. Somerfield;B. Ward
中科院分区：
文献类型：
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作者：
A. Rees;I. Brown;A. Jayakumar;G. Lessin;P. Somerfield;B. Ward
一氧化二氮 (N2O) 对全球大气辐射预算很重要，并导致平流层臭氧消耗。在全球范围内，海洋代表着大量 N2O 流入大气的净通量，但该通量的方向因地区而异。我们对海洋中氧化亚氮的产生和消耗过程的了解仍然不完整。传统的理解告诉我们，厌氧反硝化，即以 N2O 作为中间步骤将 NO3−还原为 N2，是减少 N2O 的唯一生物方法，而这一过程已知仅在缺氧环境中发生。在这里，我们提出了在全氧条件下去除 N2O 的实验证据，以及对具有新颖、非典型 N2O 还原基因序列的细菌群落的观察。这项工作的重点是高纬度大西洋，在那里我们发现细菌的消耗足以解释海洋 N2O 的消耗和大气 N2O 区域汇的发生。
Nitrous oxide (N2O) is important to the global radiative budget of the atmosphere and contributes to the depletion of stratospheric ozone. Globally the ocean represents a large net flux of N2O to the atmosphere but the direction of this flux varies regionally. Our understanding of N2O production and consumption processes in the ocean remains incomplete. Traditional understanding tells us that anaerobic denitrification, the reduction of NO3−to N2with N2O as an intermediate step, is the sole biological means of reducing N2O, a process known to occur in anoxic environments only. Here we present experimental evidence of N2O removal under fully oxygenated conditions, coupled with observations of bacterial communities with novel, atypical gene sequences for N2O reduction. The focus of this work was on the high latitude Atlantic Ocean where we show bacterial consumption sufficient to account for oceanic N2O depletion and the occurrence of regional sinks for atmospheric N2O.