Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2021WR029844 |
Concentration-discharge relationships of dissolved rhenium in Alpine catchments reveal its use as a tracer of oxidative weathering | |
Robert G. Hilton; Jens M. Turowski; Matthew Winnick; Mathieu Dellinger; Patrick Schleppi; Kenneth H. Williams; Corey R. Lawrence; Katharine Maher; Martin West; Amanda Hayton | |
2021-10-29 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Oxidative weathering of sedimentary rocks plays an important role in the global carbon cycle. Rhenium (Re) has been proposed as a tracer of rock organic carbon (OCpetro) oxidation. However, the sources of Re and its mobilization by hydrological processes remain poorly constrained. Here we examine dissolved Re as a function of water discharge, using samples collected from three alpine catchments that drain sedimentary rocks in Switzerland (Erlenbach, Vogelbach) and Colorado, USA (East River). The Swiss catchments reveal a higher Re flux in the catchment with higher erosion rates, but have similar [Re]/[Na+] and [Re]/[SO42-] ratios, which indicate a dominance of Re from OCpetro. Despite differences in rock type and hydro-climatic setting, the three catchments have a positive correlation between river water [Re]/[Na+] and [Re]/[SO42-] and water discharge. We propose that this reflects preferential routing of Re from a near-surface, oxidative weathering zone. The observations support the use of Re as a proxy to trace rock-organic carbon oxidation, and suggest it may be a hydrological tracer of vadose zone processes. We apply the Re proxy, and estimate CO2 release by OCpetro oxidation of 5.7 +6.6/-2.0 tC km-2 yr-1 for the Erlenbach. The overall weathering intensity was ∼40%, meaning that the corresponding export of un-weathered OCpetro in river sediments is large, and the findings call for more measurements of OCpetro oxidation in mountains and rivers as thet cross floodplains. |
领域 | 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/341176 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Robert G. Hilton,Jens M. Turowski,Matthew Winnick,et al. Concentration-discharge relationships of dissolved rhenium in Alpine catchments reveal its use as a tracer of oxidative weathering[J]. Water Resources Research,2021. |
APA | Robert G. Hilton.,Jens M. Turowski.,Matthew Winnick.,Mathieu Dellinger.,Patrick Schleppi.,...&Amanda Hayton.(2021).Concentration-discharge relationships of dissolved rhenium in Alpine catchments reveal its use as a tracer of oxidative weathering.Water Resources Research. |
MLA | Robert G. Hilton,et al."Concentration-discharge relationships of dissolved rhenium in Alpine catchments reveal its use as a tracer of oxidative weathering".Water Resources Research (2021). |
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