期刊
MARINE CHEMISTRY
卷 127, 期 1-4, 页码 31-39出版社
ELSEVIER
DOI: 10.1016/j.marchem.2011.07.005
关键词
Uranium; Salinity; Thorium; Particle export
资金
- WHOI
- National Science Foundation
- NASA
- Directorate For Geosciences
- Division Of Ocean Sciences [0925158] Funding Source: National Science Foundation
The concentration of U-238 in seawater is an important parameter required for applications of uranium decay-series radionuclides used to understand particle export and cycling in marine environments. Using modern mass spectrometer techniques, we re-evaluated the relationship between U-238 and salinity in the open ocean. The new U-238-salinity relationship determined here is based on a larger sample set and a wider salinity range than previous work in the open ocean. Four samples from 500 to 1000 m in the subtropical Atlantic deviated significantly from their concentration predicted from salinity; these low concentrations are hypothesized to be the result of a remote removal process rather than analytical bias or local removal of uranium. We also bring attention to unique deficits of Th-234 in the mesopelagic zone of the subtropical Atlantic and encourage future applications of Th-234 to delve into the cause of these features. Determining the concentration of U-238 in the open ocean is critical for minimizing uncertainty in the U-238-Th-234 disequilibrium method, which is a key tool for understanding particle flux to the deep ocean. (C) 2011 Elsevier B.V. All rights reserved.
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