Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1603107114 |
Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean | |
Cyril Abadie; Francois Lacan; Amandine Radic; Catherine Pradoux; and Franck Poitrasson | |
2017-01-17 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
出版年 | 2017 |
卷号 | 114期号:5页码:858-863 |
英文摘要 | AbstractAs an essential micronutrient, iron plays a key role in oceanic biogeochemistry. It is therefore linked to the global carbon cycle and climate. Here, we report a dissolved iron (DFe) isotope section in the South Atlantic and Southern Ocean. Throughout the section, a striking DFe isotope minimum (light iron) is observed at intermediate depths (200–1,300 m), contrasting with heavier isotopic composition in deep waters. This unambiguously demonstrates distinct DFe sources and processes dominating the iron cycle in the intermediate and deep layers, a feature impossible to see with only iron concentration data largely used thus far in chemical oceanography. At intermediate depths, the data suggest that the dominant DFe sources are linked to organic matter remineralization, either in the water column or at continental margins. In deeper layers, however, abiotic non-reductive release of Fe (desorption, dissolution) from particulate iron—notably lithogenic—likely dominates. These results go against the common but oversimplified view that remineralization of organic matter is the major pathway releasing DFe throughout the water column in the open ocean. They suggest that the oceanic iron cycle, and therefore oceanic primary production and climate, could be more sensitive than previously thought to continental erosion (providing lithogenic particles to the ocean), particle transport within the ocean, dissolved/particle interactions, and deep water upwelling. These processes could also impact the cycles of other elements, including nutrients. |
英文关键词 | iron isotopes GEOTRACES South Atlantic Southern Ocean remineralization |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204829 |
专题 | 地球科学 资源环境科学 气候变化 |
推荐引用方式 GB/T 7714 | Cyril Abadie,Francois Lacan,Amandine Radic,et al. Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(5):858-863. |
APA | Cyril Abadie,Francois Lacan,Amandine Radic,Catherine Pradoux,&and Franck Poitrasson.(2017).Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(5),858-863. |
MLA | Cyril Abadie,et al."Iron isotopes reveal distinct dissolved iron sources and pathways in the intermediate versus deep Southern Ocean".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.5(2017):858-863. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论