气候变化领域集成服务门户(CCPortal): Geophysical Observations of Taliks Below Drained Lake Basins on the Arctic Coastal Plain of Alaska

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DOI	10.1029/2020JB020889
	Geophysical Observations of Taliks Below Drained Lake Basins on the Arctic Coastal Plain of Alaska
	Rangel R.C.; Parsekian A.D.; Farquharson L.M.; Jones B.M.; Ohara N.; Creighton A.L.; Gaglioti B.V.; Kanevskiy M.; Breen A.L.; Bergstedt H.; Romanovsky V.E.; Hinkel K.M.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Lakes and drained lake basins (DLBs) together cover up to ∼80% of the western Arctic Coastal Plain of Alaska. The formation and drainage of lakes in this continuous permafrost region drive spatial and temporal landscape dynamics. Postdrainage processes including vegetation succession and permafrost aggradation have implications for hydrology, carbon cycling, and landscape evolution. Here, we used surface nuclear magnetic resonance (NMR) and transient electromagnetic (TEM) measurements in conjunction with thermal modeling to investigate permafrost aggradation beneath eight DLBs on the western Arctic Coastal Plain of Alaska. We also surveyed two primary surface sites that served as nonlake affected control sites. Approximate timing of lake drainage was estimated based on historical aerial imagery. We interpreted the presence of taliks based on either unfrozen water estimated with surface NMR and/or TEM resistivities in DLBs compared to measurements on primary surface sites and borehole resistivity logs. Our results show evidence of taliks below several DLBs that drained before and after 1949 (oldest imagery). We observed depths to the top of taliks between 9 and 45 m. Thermal modeling and geophysical observations agree about the presence and extent of taliks at sites that drained after 1949. Lake drainage events will likely become more frequent in the future due to climate change and our modeling results suggest that warmer and wetter conditions will limit permafrost aggradation in DLBs. Our observations provide useful information to predict future evolution of permafrost in DLBs and its implications for the water and carbon cycles in the Arctic. © 2021. The Authors.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187260
作者单位	Department of Geology and Geophysics, University of Wyoming, Laramie, WY, United States; Department of Civil and Architectural Engineering, University of Wyoming, Laramie, WY, United States; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Institute of Northern Engineering, University of Alaska Fairbanks, Fairbanks, AK, United States; International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, MI, United States
推荐引用方式 GB/T 7714	Rangel R.C.,Parsekian A.D.,Farquharson L.M.,et al. Geophysical Observations of Taliks Below Drained Lake Basins on the Arctic Coastal Plain of Alaska[J],2021,126(3).
APA	Rangel R.C..,Parsekian A.D..,Farquharson L.M..,Jones B.M..,Ohara N..,...&Hinkel K.M..(2021).Geophysical Observations of Taliks Below Drained Lake Basins on the Arctic Coastal Plain of Alaska.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Rangel R.C.,et al."Geophysical Observations of Taliks Below Drained Lake Basins on the Arctic Coastal Plain of Alaska".Journal of Geophysical Research: Solid Earth 126.3(2021).