气候变化领域集成服务门户(CCPortal): Degradation of ice-wedge polygons leads to increased fluxes of water and DOC

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DOI	10.1016/j.scitotenv.2024.170931
	Degradation of ice-wedge polygons leads to increased fluxes of water and DOC
	Speetjens, Niek Jesse; Berghuijs, Wouter R.; Wagner, Julia; Vonk, Jorien E.
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	920
卷号	920
英文摘要	Ice-wedge polygon landscapes make up a substantial part of high-latitude permafrost landscapes. The hydrological conditions shape how these landscapes store and release organic carbon. However, their coupled water-carbon dynamics are poorly understood as field measurements are sparse in smaller catchments and coupled hydrology-dissolved organic carbon (DOC) models are not tailored for these landscapes. Here we present a model that simulates the hydrology and associated DOC export of high-centered and low-centered ice-wedge polygons and apply the model to a small catchment with abundant polygon coverage along the Yukon Coast, Canada. The modeled seasonal pattern of water and carbon fluxes aligns with sparse field data. These modeled seasonal patterns indicate that early-season runoff is mostly surficial and generated by low-centered polygons and snow trapped in troughs of high-centered polygons. High-centered polygons show potential for deeper subsurface flow under future climate conditions. This suggests that high-centered polygons will be responsible for an increasing proportion of annual DOC export compared to low-centered polygons. Warming likely shifts low-centered polygons to high-centered polygons, and our model shows that this shift will cause a deepening of the active layer and a lengthening of the thawing season. This, in turn, intensifies seasonal runoff and DOC flux, mainly through its duration. Our model provides a physical hypothesis that can be used to further quantify and refine our understanding of hydrology and DOC export of arctic ice-wedge polygon terrain.
英文关键词	Permafrost; Hydrology; Ice -wedge polygon; Lateral carbon flux; Model; Dissolved organic carbon
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001187772500001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/300366
作者单位	Vrije Universiteit Amsterdam; University of Victoria
推荐引用方式 GB/T 7714	Speetjens, Niek Jesse,Berghuijs, Wouter R.,Wagner, Julia,et al. Degradation of ice-wedge polygons leads to increased fluxes of water and DOC[J],2024,920.
APA	Speetjens, Niek Jesse,Berghuijs, Wouter R.,Wagner, Julia,&Vonk, Jorien E..(2024).Degradation of ice-wedge polygons leads to increased fluxes of water and DOC.SCIENCE OF THE TOTAL ENVIRONMENT,920.
MLA	Speetjens, Niek Jesse,et al."Degradation of ice-wedge polygons leads to increased fluxes of water and DOC".SCIENCE OF THE TOTAL ENVIRONMENT 920(2024).