气候变化领域集成服务门户(CCPortal): Mapping the age of ice of Gauligletscher combining surface radionuclide contamination and ice flow modeling

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DOI	10.5194/tc-14-4233-2020
	Mapping the age of ice of Gauligletscher combining surface radionuclide contamination and ice flow modeling
	Jouvet G.; Röllin S.; Sahli H.; Corcho J.; Gnägi L.; Compagno L.; Sidler D.; Schwikowski M.; Bauder A.; Funk M.
发表日期	2020
ISSN	19940416
起始页码	4233
结束页码	4251
卷号	14 期号:11
英文摘要	In the 1950s and 1960s, specific radionuclides were released into the atmosphere as a result of nuclear weapons testing. This radioactive fallout left its signature on the accumulated layers of glaciers worldwide, thus providing a tracer for ice particles traveling within the gravitational ice flow and being released into the ablation zone. For surface ice dating purposes, we analyze here the activity of 239Pu, 240Pu and 236U radionuclides derived from more than 200 ice samples collected along five flowlines at the surface of Gauligletscher, Switzerland. It was found that contaminations appear band-wise along most of the sampled lines, revealing a V-shaped profile consistent with the ice flow field already observed. Similarities to activities found in ice cores permit the isochronal lines at the glacier from 1960 and 1963 to be identified. Hence this information is used to fine-Tune an ice flow/mass balance model, and to accurately map the age of the entire glacier ice. Our results indicate the strong potential for combining radionuclide contamination and ice flow modeling in two different ways. First, such tracers provide unique information on the long-Term ice motion of the entire glacier (and not only at its surface), and on the longterm mass balance, and therefore offer an extremely valuable data tool for calibrating ice flows within a model. Second, the dating of surface ice is highly relevant when conducting "horizontal ice core sampling", i.e., when taking chronological samples of surface ice from the distant past, without having to perform expensive and logistically complex deep icecore drilling. In conclusion, our results show that an airplane which crash-landed on the Gauligletscher in 1946 will likely soon be released from the ice close to the place where pieces have emerged in recent years, thus permitting the prognosis given in an earlier model to be revised considerably. © 2020 BMJ Publishing Group. All rights reserved.
英文关键词	ablation; fallout; flow field; flow modeling; ice core; ice flow; nuclear weapons testing; radionuclide; Switzerland; Trachinotus falcatus
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202120
作者单位	Autonomous Systems Laboratory, Eth Zurich, Zurich, Switzerland; Department of Geography, University of Zurich, Zurich, Switzerland; Spiez Laboratory, Federal Office for Civil Protection, Spiez, Switzerland; Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland; Nbc Defence Laboratory 1, Swiss Armed Forces, Switzerland; Laboratory of Hydraulics, Hydrology and Glaciology, Eth Zurich, Zurich, Switzerland; Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, Switzerland; Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany; Paul Scherrer Institute, Villigen, Switzerland; Laboratory of Hydraulics, Hydrology and Glaciology, Eth Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Jouvet G.,Röllin S.,Sahli H.,et al. Mapping the age of ice of Gauligletscher combining surface radionuclide contamination and ice flow modeling[J],2020,14(11).
APA	Jouvet G..,Röllin S..,Sahli H..,Corcho J..,Gnägi L..,...&Funk M..(2020).Mapping the age of ice of Gauligletscher combining surface radionuclide contamination and ice flow modeling.Cryosphere,14(11).
MLA	Jouvet G.,et al."Mapping the age of ice of Gauligletscher combining surface radionuclide contamination and ice flow modeling".Cryosphere 14.11(2020).