气候变化领域集成服务门户(CCPortal): Carbon Dioxide and Methane Flux in a Dynamic Arctic Tundra Landscape: Decadal-Scale Impacts of Ice Wedge Degradation and Stabilization

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DOI	10.1029/2020GL089894
	Carbon Dioxide and Methane Flux in a Dynamic Arctic Tundra Landscape: Decadal-Scale Impacts of Ice Wedge Degradation and Stabilization
	Wickland K.P.; Jorgenson M.T.; Koch J.C.; Kanevskiy M.; Striegl R.G.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	Ice wedge degradation is a widespread occurrence across the circumpolar Arctic causing extreme spatial heterogeneity in water distribution, vegetation, and energy balance across landscapes. These heterogeneities influence carbon dioxide (CO2) and methane (CH4) fluxes, yet there is little understanding of how they effect change in landscape-level carbon (C) gas flux over time. We measured CO2 and CH4 fluxes in an area undergoing ice wedge degradation near Prudhoe Bay, Alaska, and combined with repeat imagery analysis to estimate seasonal landscape-level C flux response to geomorphic change. Net CO2 and CH4 emissions changed by −25% and +42%, respectively, resulting in a 14% increase in seasonal CO2-C equivalent emissions over 69 years as ice wedge degradation formed water-filled troughs. The dynamic ice wedge degradation/stabilization process can cause significant changes in CO2 and CH4 fluxes over time, and the integration of this process is important to forecasting landscape-level C fluxes in permafrost regions abundant in ice wedges. ©2020. American Geophysical Union. All Rights Reserved. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
英文关键词	Carbon dioxide; Carbon dioxide process; Methane; Water supply systems; Arctic tundra; Flux response; Imagery analysis; Landscape level; Methane fluxes; Permafrost region; Spatial heterogeneity; Water distributions; Ice; carbon dioxide; carbon emission; carbon flux; heterogeneity; landscape; methane; permafrost; satellite imagery; seasonal variation; tundra; Alaska; Arctic; Prudhoe Bay; United States
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169456
作者单位	Water Resources Mission Area, U.S. Geological Survey, Boulder, CO, United States; Alaska Ecoscience, Fairbanks, AK, United States; Alaska Science Center, U.S. Geological Survey, Anchorage, AK, United States; Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, AK, United States
推荐引用方式 GB/T 7714	Wickland K.P.,Jorgenson M.T.,Koch J.C.,et al. Carbon Dioxide and Methane Flux in a Dynamic Arctic Tundra Landscape: Decadal-Scale Impacts of Ice Wedge Degradation and Stabilization[J],2020,47(22).
APA	Wickland K.P.,Jorgenson M.T.,Koch J.C.,Kanevskiy M.,&Striegl R.G..(2020).Carbon Dioxide and Methane Flux in a Dynamic Arctic Tundra Landscape: Decadal-Scale Impacts of Ice Wedge Degradation and Stabilization.Geophysical Research Letters,47(22).
MLA	Wickland K.P.,et al."Carbon Dioxide and Methane Flux in a Dynamic Arctic Tundra Landscape: Decadal-Scale Impacts of Ice Wedge Degradation and Stabilization".Geophysical Research Letters 47.22(2020).