气候变化领域集成服务门户(CCPortal): Floodplain dynamics in North American permafrost regions under a warming climate and implications for organic carbon stocks: A review and synthesis

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DOI	10.1016/j.earscirev.2019.02.024
	Floodplain dynamics in North American permafrost regions under a warming climate and implications for organic carbon stocks: A review and synthesis
	Lininger K.B.; Wohl E.
发表日期	2019
ISSN	0012-8987
起始页码	24
结束页码	44
卷号	193
英文摘要	Although there have been studies on changes to hydrology in permafrost regions and exports of nutrients and organic matter to the Arctic Ocean, little is known about how geomorphic dynamics of rivers in permafrost regions will change in the future under a warming climate and the effects of those changes on floodplains. We focus on river dynamics in the context of channel-floodplain interactions and the implications for organic carbon storage in floodplains. As sites of nutrient processing and storage of sediments and organic matter, changes in channel and floodplain form and process will impact sediment yields, nutrient and organic matter export to the Arctic Ocean, aquatic and riparian habitat, and infrastructure. We present a review of the factors influencing reach-scale river dynamics, using the framework of factors affecting erosive force and erosional resistance of banks and floodplain surfaces, which will change due to a warming climate. We summarize studies indicating how observed and modeled trends in these factors will affect erosive force and erosional resistance in the future. We then hypothesize the net effects that these changes will have on the ratio of erosive force to erosional resistance, and the cascading effects on channel and floodplain form and process. We describe two scenarios that could occur under different conditions in the form of conceptual models, one in which the ratio of erosive force and erosional resistance decreases, and one in which the ratio increases. An increase in the ratio of erosive force to erosional resistance due to a reduction in permafrost extent and depth and an overall increase in discharge would increase bank erosion, bank failures, sediment supply, and lateral channel migration rates, decreasing floodplain turnover time and the age of riparian vegetation. A decrease in the ratio of erosive force to erosional resistance due to a reduction in erosive force relative to sediment supply would cause enhanced deposition within the river corridor. Regardless of which scenario may occur, changes in channel process and form will influence the ratio of lateral to vertical accretion, change the nature and stored amount of floodplain sediment, and change the sources and storage of organic carbon within floodplains. © 2019 Elsevier B.V.
语种	英语
scopus关键词	channel morphology; climate change; erosion; floodplain; global warming; organic carbon; permafrost; sediment yield; Arctic Ocean
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209900
作者单位	Department of Geography, University of Colorado at Boulder, Boulder, CO, United States; Department of Geosciences, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Lininger K.B.,Wohl E.. Floodplain dynamics in North American permafrost regions under a warming climate and implications for organic carbon stocks: A review and synthesis[J],2019,193.
APA	Lininger K.B.,&Wohl E..(2019).Floodplain dynamics in North American permafrost regions under a warming climate and implications for organic carbon stocks: A review and synthesis.EARTH-SCIENCE REVIEWS,193.
MLA	Lininger K.B.,et al."Floodplain dynamics in North American permafrost regions under a warming climate and implications for organic carbon stocks: A review and synthesis".EARTH-SCIENCE REVIEWS 193(2019).