globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116822
论文题名:
The fate of fluvially-deposited organic carbon during transient floodplain storage
作者: Scheingross J.S.; Repasch M.N.; Hovius N.; Sachse D.; Lupker M.; Fuchs M.; Halevy I.; Gröcke D.R.; Golombek N.Y.; Haghipour N.; Eglinton T.I.; Orfeo O.; Schleicher A.M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 561
语种: 英语
中文关键词: carbon cycle ; floodplains ; organic carbon ; oxidation ; rivers
英文关键词: Banks (bodies of water) ; Carbon dioxide ; Digital storage ; Floods ; Groundwater ; Organic carbon ; Oxidation ; Carbon fluxes ; Chronosequences ; Floodplain deposits ; Fluvial transport ; Ground water table ; Lowland rivers ; Particulate organic carbon ; River systems ; Rivers ; carbon flux ; carbon storage ; floodplain ; fluvial deposit ; organic carbon ; oxidation ; river system ; transient flow ; Argentina
英文摘要: CO2 release from particulate organic carbon (POC) oxidation during fluvial transit can influence climate over a range of timescales. Identifying the mechanistic controls on such carbon fluxes requires determining where POC oxidation occurs in river systems. While field data show POC oxidation and replacement moving downstream in lowland rivers, flume studies show that oxidation during active fluvial transport is limited. This suggests that most fluvial POC oxidation occurs during transient floodplain storage, but this idea has yet to be tested. Here, we isolate the influence of floodplain storage time on POC oxidation by exploiting a chronosequence of floodplain deposits above the modern groundwater table in the Rio Bermejo, Argentina. Measurements from 15 floodplain cores with depositional ages from 1 y to 20 ky show a progressive POC concentration decrease and 13C-enrichment with increasing time spent in floodplain storage. These results from the Rio Bermejo indicate that over 80% of fluvially-deposited POC can be oxidized over millennial timescales in aerated floodplains. Furthermore, POC in the oldest floodplain cores is more 14C-enriched than expected based on the independently-dated floodplain ages, indicating that a portion of this oxidized POC is replaced by autochthonous POC produced primarily by floodplain vegetation. We suggest floodplain storage timescales control the extent of oxidation of fluvially-deposited POC, and may play a prominent role in determining if rivers are significant atmospheric CO2 sources. © 2021 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165663
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: GFZ-German Research Centre for Geosciences, Potsdam, Germany; Department of Geological Sciences and Engineering, University of Nevada Reno, United States; Institute of Geosciences, University of Potsdam, Germany; Geological Institute, ETH Zürich, Zürich, Switzerland; Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Germany; Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot, Israel; Department of Earth Sciences, Durham University, Durham, United Kingdom; Department of Earth and Environmental Sciences, Dalhousie University, Halifax, Canada; Laboratory of Ion Beam Physics, ETH Zürich, Zürich, Switzerland; Centro de Ecología Aplicada del Litoral, CONICET, Corrientes, Argentina

Recommended Citation:
Scheingross J.S.,Repasch M.N.,Hovius N.,et al. The fate of fluvially-deposited organic carbon during transient floodplain storage[J]. Earth and Planetary Science Letters,2021-01-01,561
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Scheingross J.S.]'s Articles
[Repasch M.N.]'s Articles
[Hovius N.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Scheingross J.S.]'s Articles
[Repasch M.N.]'s Articles
[Hovius N.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Scheingross J.S.]‘s Articles
[Repasch M.N.]‘s Articles
[Hovius N.]‘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.