气候变化领域集成服务门户(CCPortal): Particulate dominance of organic carbon mobilization from thaw slumps on the Peel Plateau, NT: Quantification and implications for stream systems and permafrost carbon release

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DOI	10.1088/1748-9326/abac36
	Particulate dominance of organic carbon mobilization from thaw slumps on the Peel Plateau, NT: Quantification and implications for stream systems and permafrost carbon release
	Shakil S.; Tank S.E.; Kokelj S.V.; Vonk J.E.; Zolkos S.
发表日期	2020
ISSN	17489318
卷号	15 期号:11
英文摘要	Climate change is increasing the frequency and intensity of thermokarst, and accelerating the delivery of terrestrial organic material from previously sequestered sources to aquatic systems, where it is subject to further biochemical alteration. Rapid climate change in the glacially conditioned ice-rich and ice-marginal terrain of the Peel Plateau, western Canada, is accelerating thaw-driven mass wasting in the form of retrogressive thaw slumps, which are rapidly increasing in area, volume and thickness of permafrost thawed. Despite major perturbation of downstream sedimentary and geochemical fluxes, few studies have examined changes in flux and composition of particulate organic carbon (POC) in streams and rivers as a result of permafrost thaw. Here we show that the orders of magnitude increase in total organic carbon, nitrogen, and phosphorus mobilized to streams from thaw slumps on the Peel Plateau is almost entirely due to POC and associated particulate nitrogen and phosphorus release. Slump-mobilized POC is compositionally distinct from its dissolved counterpart and appears to contain relatively greater amounts of degraded organic matter, as inferred from base-extracted fluorescence of particulate organic matter. Thus, slump-mobilized POC is potentially more recalcitrant than POC present in non-slump affected stream networks. Furthermore a substantial portion of POC mobilized from thaw slumps will be constrained within primary sediment stores in valley bottoms, where net accumulation is currently exceeding net erosion, resulting in century to millennial scale sequestration of thermokarst-mobilized POC. This study highlights the pressing need for better knowledge of sedimentary cascades, mobilization, and storage reservoirs in slump-affected streams, and baseline assessments of the biodegradability of POC and cycling of particulate nutrients within a sedimentary cascade framework. Explicit incorporation of POC dynamics into our understanding of land-water carbon mobilization in the face of permafrost thaw is critical for understanding implications of thermokarst for regional carbon cycling and fluvial ecosystems. © 2020 The Author(s). Published by IOP Publishing Ltd
英文关键词	Climate change; Organic carbon; Particulate; Permafrost; Streams; Thermokarst
语种	英语
scopus关键词	Biodegradability; Biogeochemistry; Climate change; Erosion; Nitrogen; Permafrost; Phosphorus; Reservoirs (water); Sedimentology; Thawing; Baseline assessment; Nitrogen and phosphorus; Orders of magnitude; Particulate organic carbon; Particulate organic matters; Rapid climate change; Storage reservoirs; Total Organic Carbon; Organic carbon; carbon cycle; climate change; dominance; flux measurement; geochemistry; ice margin; mass wasting; mobilization; organic carbon; particulate matter; permafrost; quantitative analysis; slumping; thawing; thermokarst; Canada; Ontario [Canada]; Peel [Ontario]
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153532
作者单位	Biological Sciences, University of Alberta, Edmonton, Canada; Northwest Territories Geological Survey, Yellowknife, NT X1A 2L9, Canada; Department of Earth Sciences, Vrije Universiteit, Amsterdam, Netherlands; Woods Hole Research Center, Falmouth, MA 02540, United States
推荐引用方式 GB/T 7714	Shakil S.,Tank S.E.,Kokelj S.V.,et al. Particulate dominance of organic carbon mobilization from thaw slumps on the Peel Plateau, NT: Quantification and implications for stream systems and permafrost carbon release[J],2020,15(11).
APA	Shakil S.,Tank S.E.,Kokelj S.V.,Vonk J.E.,&Zolkos S..(2020).Particulate dominance of organic carbon mobilization from thaw slumps on the Peel Plateau, NT: Quantification and implications for stream systems and permafrost carbon release.Environmental Research Letters,15(11).
MLA	Shakil S.,et al."Particulate dominance of organic carbon mobilization from thaw slumps on the Peel Plateau, NT: Quantification and implications for stream systems and permafrost carbon release".Environmental Research Letters 15.11(2020).