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Author Cardyn, Raphaelle ♦ Clark, Ian D ♦ Lacelle, Denis ♦ Lauriol, Bernard ♦ Zdanowicz, Christian ♦ Calmels, Fabrice
Source PANGAEA
Content type Text
Publisher PANGAEA
File Format ZIP
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences ♦ Geology, hydrology & meteorology
Subject Keyword Land Surface
Abstract The molar ratios of atmospheric gases change during dissolution in water due to differences in their relative solubilities. We exploited this characteristic to develop a tool to clarify the origin of ice formations in permafrost regions. Extracted from ice, molar gas ratios can distinguish buried glacier ice from intrasedimental ground ice formed by freezing groundwaters. An extraction line was built to isolate gases from ice by melting and trapping with liquid He, followed by analysis of N2, O2, Ar, 18O-O2 and 15N-N2, by continuous flow mass spectrometry. The method was tested using glacier ice, aufeis ice (river icing) and intrasedimental ground ice from sites in the Canadian Arctic. O2/Ar and N2/Ar ratios clearly distinguish between atmospheric gas in glacial ice and gases from intrasedimental ground ice, which are exsolved from freezing water. 615NN2 and 618OO2 in glacier ice, aufeis ice and intrasedimental ground ice do not show clear distinguishing trends as they are affected by various physical processes during formation such as gravitational settling, excess air addition, mixing with snow pack, and respiration.
Spatial Coverage Latitude: 69.071278;Longitude: -91.803056
Description Project(s):International Polar Year (2007-2008) (IPY);Note: 2 datasets
Part of series Supplement to: Cardyn, R et al. (2007): Molar gas ratios of air entrapped in ice: A new tool to determine the origin of relict massive ground ice bodies in permafrost. Quaternary Research, 68(2), 239-248, https://doi.org/10.1016/j.yqres.2007.05.003
Educational Use Research
Learning Resource Type Data Set
Publisher Date 2007-02-27
Rights License https://creativecommons.org/licenses/by/3.0/


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