Mesoscale Eddy Effects on Nitrogen Cycles in the Northern South China Sea Since the Last Glacial

Mesoscale Eddy Effects on Nitrogen Cycles in the Northern South China Sea Since the Last Glacial
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末次冰期以来南海北部中尺度涡旋对氮循环的影响

DOI:
10.3389/feart.2022.886200
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发表时间:
2022-05
影响因子:
2.9
通讯作者:
Dong Liang
Dong Liang
中科院分区:
地球科学3区
文献类型:
--
作者:
Chen Miao;Zhao Xiaoxiao;Li Da-Wei;Dong Liang

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海洋氨氧化是调节海洋氮循环的最重要的中间途径,但其在地质时间尺度上的具体作用研究仅限于南海南部的特定边缘海。为了探索南海古细菌氨氧化作用的空间格局,根据收集的数据剖面,分析和检验了古细菌氨氧化速率的指标GDGT-[2/[3比率(甘油二烷基甘油四醚))。末次冰期以来的南海北方。结果表明,南海北方GDGT-[2]/[3]比值与南海南部相反,全新世GDGT-[2]/[3]值高于末次冰期。根据已发表的北方南海30 ka以来的温跃层深度资料,我们认为这种差异是由中尺度涡旋引起的水文结构变化造成的。因此,物理过程是在长时间尺度上控制氮循环的重要因素。这项研究可能会提供新的见解古氨氧化在海洋氮循环的地质时间尺度的理解。
Archaeal ammonia oxidation is the most important intermediate pathway in regulating the oceanic nitrogen cycle; however, the study of its specific role on a geological time scale is restricted to a specific part of marginal seas; thus far, only in the southern South China Sea (SCS). To explore the spatial pattern of the role of archaeal ammonia oxidation in the SCS, the GDGT-[2/[3 ratio (Glycerol Dialkyl Glycerol Tetraether), an indicator of the archaeal ammonia oxidation rate, was analyzed and examined from the collected data profiles since the last glacial period in the northern SCS. The results showed that the GDGT-[2/[3 ratio in the northern SCS was opposite to that in the southern SCS, with higher GDGT-[2/[3 values during the Holocene compared to the last glacial period. Based on existing published depths of thermocline (DOT) data in the northern SCS since 30 ka, we believe that hydrological structural variations induced by mesoscale eddies caused this difference. Therefore, physical processes are very important factors that control the nitrogen cycle over a long-time scale. This study may provide new insights into the understanding of the role of archaeal ammonia oxidation within the marine nitrogen cycle over geological time scale.
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