期刊
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷 124, 期 12, 页码 9338-9363出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019JC015265
关键词
Arctic Ocean; Amerasian Basin; radioisotopes; temporal evolution; particle flux; lateral exchanges
类别
资金
- Canadian research program NSERC CCAR
- European Union's Horizon 2020 research and innovation programme (Marie Sklodowska-Curie action) [657853]
- Natural Sciences and Engineering Research Council of Canada
- Fonds Quebecois de la Recherche sur la Nature et les Technologies from GEOTOP
- Marie Curie Actions (MSCA) [657853] Funding Source: Marie Curie Actions (MSCA)
Since the 1980-1990s, international research efforts have augmented our knowledge of the physical and chemical properties of the Arctic Ocean water masses, and recent studies have documented changes. Understanding the processes responsible for these changes is necessary to be able to forecast the local and global consequences of these property evolutions on climate. The present work investigates the distributions of geochemical tracers of particle fluxes and circulation in the Amerasian Basin and their temporal evolution over the last three decades (from stations visited between 1983 and 2015). Profiles of 230-thorium (Th-230) and 231-protactinium (Pa-231) concentrations and neodymium isotopes (expressed as epsilon(Nd)) measured in the Amerasian Basin prior to 2000 are compared to a new, post-2000s data set. The comparison shows a large scale decrease in dissolved Th-230 and Pa-231 concentrations, suggesting intensification of scavenging by particle flux, especially in coastal areas. Higher productivity and sediment resuspension from the shelves appear responsible for the concentration decrease along the margins. In the basin interior, increased lateral exchanges with the boundary circulation also contribute to the decrease in concentration. This study illustrates how dissolved Th-230 and Pa-231, with epsilon(Nd) support, can provide unique insights not only into changes in particle flux but also into the evolution of ocean circulation and mixing.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据