气候变化领域集成服务门户(CCPortal): Fluvial organic carbon cycling regulated by sediment transit time and mineral protection

CCPortal

DOI	10.1038/s41561-021-00845-7
	Fluvial organic carbon cycling regulated by sediment transit time and mineral protection
	Repasch M.; Scheingross J.S.; Hovius N.; Lupker M.; Wittmann H.; Haghipour N.; Gröcke D.R.; Orfeo O.; Eglinton T.I.; Sachse D.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:11
英文摘要	Rivers transfer terrestrial organic carbon (OC) from mountains to ocean basins, playing a key role in the global carbon cycle. During fluvial transit, OC may be oxidized and emitted to the atmosphere as CO2 or preserved and transported to downstream depositional sinks. The balance between oxidation and preservation determines the amount of particulate OC (POC) that can be buried long term, but the factors regulating this balance are poorly constrained. Here, we quantify the effects of fluvial transit on POC fluxes along an ~1,300 km lowland channel with no tributaries. We show that sediment transit time and mineral protection regulate the magnitude and rate of POC oxidation, respectively. Using a simple turnover model, we estimate that annual POC oxidation is a small percentage of the POC delivered to the river. Modelling shows that lateral erosion into POC-rich floodplains can increase POC fluxes to downstream basins, thereby offsetting POC oxidation. Consequently, rivers with high channel mobility can enhance CO2 drawdown while management practices that stabilize river channels may reduce the potential for CO2 drawdown. © 2021, The Author(s).
语种	英语
scopus关键词	atmosphere; drawdown; magnitude; mobility; organic carbon; Nigeria; Rivers
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250843
作者单位	German Research Centre for Geosciences (GFZ), Potsdam, Germany; Institute of Geosciences, University of Potsdam, Potsdam, Germany; Department of Geological Sciences and Engineering, University of Nevada Reno, Reno, NV, United States; Geological Institute, ETH Zürich, Zürich, Switzerland; Laboratory of Ion Beam Physics, ETH Zürich, Zürich, Switzerland; Department of Earth Sciences, Durham University, Durham, United Kingdom; CONICET, Center for Applied Ecology of the Littoral, Universidad Nacional de Nordeste, Corrientes, Argentina
推荐引用方式 GB/T 7714	Repasch M.,Scheingross J.S.,Hovius N.,et al. Fluvial organic carbon cycling regulated by sediment transit time and mineral protection[J],2021,14(11).
APA	Repasch M..,Scheingross J.S..,Hovius N..,Lupker M..,Wittmann H..,...&Sachse D..(2021).Fluvial organic carbon cycling regulated by sediment transit time and mineral protection.Nature Geoscience,14(11).
MLA	Repasch M.,et al."Fluvial organic carbon cycling regulated by sediment transit time and mineral protection".Nature Geoscience 14.11(2021).