太平洋深处水热诱导难熔DOC沉降

IF 5.5 2区 地球科学 Q1 ENVIRONMENTAL SCIENCES
D. A. Hansell, C. R. German, C. A. Carlson, E. R. M. Druffel, W. J. Jenkins, S. Q. Lang, B. M. Toner
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引用次数: 0

摘要

溶解有机碳(DOC)是全球海洋中最大的还原碳库,其重要贡献来自新近形成和老化的生物难降解DOC (RDOC)。尽管热液喷口已被确定为RDOC的来源和汇,但调节RDOC转化和去除的机制仍不确定。本研究考察了太平洋深处的RDOC水槽,突出了海底热液系统的作用。来自GO-SHIP和GEOTRACES项目的地球化学调查数据,以及对太平洋热液系统的具体调查表明,热液系统引入的颗粒铁在清除DOC并将其输送到海底方面发挥了关键作用,导致深海RDOC出现短缺。具有低DOC浓度的热液对海洋水柱的稀释可能起次要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Hydrothermally Induced Refractory DOC Sinks in the Deep Pacific Ocean

Hydrothermally Induced Refractory DOC Sinks in the Deep Pacific Ocean

Hydrothermally Induced Refractory DOC Sinks in the Deep Pacific Ocean

Hydrothermally Induced Refractory DOC Sinks in the Deep Pacific Ocean

Hydrothermally Induced Refractory DOC Sinks in the Deep Pacific Ocean

Dissolved organic carbon (DOC) constitutes the largest pool of reduced carbon in the global ocean, with important contributions from both recently formed and aged, biologically refractory DOC (RDOC). The mechanisms regulating RDOC transformation and removal remain uncertain though hydrothermal vents have been identified as sources and sinks. This study examines RDOC sinks in the deep Pacific Ocean, highlighting the role of submarine hydrothermal systems. Geochemical survey data from GO-SHIP and GEOTRACES projects, alongside specific investigations of Pacific hydrothermal systems, suggest that particulate iron introduced by hydrothermal systems plays a key role in scavenging DOC and delivering it to the seafloor, leaving a deficit in the RDOC of the deep ocean. Dilution of the oceanic water column by hydrothermal fluids exhibiting low DOC concentrations likely plays a secondary role.

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来源期刊
Global Biogeochemical Cycles
Global Biogeochemical Cycles 环境科学-地球科学综合
CiteScore
8.90
自引率
7.70%
发文量
141
审稿时长
8-16 weeks
期刊介绍: Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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