globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116958
论文题名:
Controls on short-term dissolved 87Sr/86Sr variations in large rivers: Evidence from the Ganga–Brahmaputra
作者: Boral S.; Peucker-Ehrenbrink B.; Hemingway J.D.; Sen I.S.; Galy V.; Fiske G.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 566
语种: 英语
中文关键词: 87Sr/86Sr ; predictive hydro-geochemical model ; rivers Ganga Brahmaputra ; sediment-water interactions ; Sr flux ; time series
英文关键词: Atmospheric thermodynamics ; Catchments ; Dissolution ; Geochemistry ; Rain ; Sediments ; Silicate minerals ; Stream flow ; Strontium ; Time series ; Weathering ; Brahmaputra ; Large rivers ; Predictive hydro-geochemical model ; Radiogenics ; River ganga brahmaputra ; Sediment/water interaction ; Short term ; Sr fluxes ; Suspended particulates ; Times series ; Rivers ; floodplain ; headwater ; hydrogeochemistry ; isotopic composition ; radionuclide ; river system ; river water ; sediment-water interface ; strontium isotope ; temporal variation ; time series ; Brahmaputra River ; Ganges River
英文摘要: Variations in the marine 87Sr/86Sr record are largely driven by riverine export of weathering-derived strontium. Among the large river systems, the Ganga and the Brahmaputra deliver a disproportionately large flux of radiogenic Sr (i.e., high 87Sr/86Sr) to the ocean. Understanding the sources and processes that make these river systems such important contributors of radiogenic Sr to seawater has been the focus of many studies; extremely radiogenic silicate and carbonate rocks of the Lesser Himalayan formations impart river water with high 87Sr/86Sr values. Furthermore, dissolved 87Sr/86Sr compositions show large temporal variability in both headwater and floodplain catchments; the magnitude of these fluctuations is higher than is observed in any other major river globally. Here, we present dissolved and depth-specific suspended particulate Sr time-series data from the rivers Ganga and Brahmaputra with weekly resolution during the monsoon and monthly resolution during the non-monsoon seasons of 2010–2011. We find that dissolved 87Sr/86Sr compositions of both rivers show substantial short-term variability with week-to-week changes as large as 0.0134 87Sr/86Sr units. Dissolved 87Sr/86Sr compositions correlate strongly with suspended particulate 87Sr/86Sr compositions at all depths. To understand the short-term variability of dissolved 87Sr/86Sr, we developed a hydro-geochemical mixing model using literature-derived Sr concentration and 87Sr/86Sr values of major tributaries combined with 5-day integrated rainfall as a proxy for unavailable discharge data. Results indicate that short-term changes in dissolved 87Sr/86Sr are largely driven by spatio-temporal rainfall variability across the Ganga and Brahmaputra watersheds. We also observe strong correlations between the dissolved 87Sr/86Sr and the particulate 87Sr/86Sr along the depth-profile in both rivers as well as in other large rivers globally. Hence, we corroborate the findings from Tipper et al. (2021) and propose that in-stream interactions with radiogenic sediments during transport further contribute to dissolved 87Sr/86Sr variability. © 2021 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165415
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Department of Earth Sciences, Indian Institute of Technology, Kanpur, UP 208016, India; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States; Department of Earth and Planetary Sciences, Harvard UniversityMA 02138, United States; Woodwell Climate Research Center, Falmouth, MA 02540, United States

Recommended Citation:
Boral S.,Peucker-Ehrenbrink B.,Hemingway J.D.,et al. Controls on short-term dissolved 87Sr/86Sr variations in large rivers: Evidence from the Ganga–Brahmaputra[J]. Earth and Planetary Science Letters,2021-01-01,566
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Boral S.]'s Articles
[Peucker-Ehrenbrink B.]'s Articles
[Hemingway J.D.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Boral S.]'s Articles
[Peucker-Ehrenbrink B.]'s Articles
[Hemingway J.D.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Boral S.]‘s Articles
[Peucker-Ehrenbrink B.]‘s Articles
[Hemingway J.D.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.