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Ion Fractionation and Percolation in Ice Cores with Seasonal Melting
Title: | Ion Fractionation and Percolation in Ice Cores with Seasonal Melting |
Authors: | Moore, John C. Browse this author | Grinsted, Aslak Browse this author |
Keywords: | Svalbard | ice core | ion chemistry | climate change | statistical analysis | diffusion | percolation |
Issue Date: | Dec-2009 |
Publisher: | Institute of Low Temperature Science, Hokkaido University |
Citation: | Physics of Ice Core Records II : Papers collected after the 2nd International Workshop on Physics of Ice Core Records, held in Sapporo, Japan, 2-6 February 2007. Edited by Takeo Hondoh |
Journal Title: | 低温科学 |
Journal Title(alt): | Low Temperature Science |
Volume: | 68 |
Issue: | Supplement |
Start Page: | 287 |
End Page: | 298 |
Abstract: | We examine the impact that post-depositional change has on ion concentrations in ice cores that suffer limited seasonal melting. We show that the impact in the case of at least one Svalbard ice core is limited to decreasing resolution of signals to about 3 years - a similar accuracy as the best dating can usually provide. We model various effects such as percolation and washout of ions, and show how they can be used to construct useful ice core proxies. The sulfate profile shows how post depositional effects lead to magnesium and nitrate being excellent predictors under normal conditions for sulfate - indicating a difference in the properties of acidic and neutral salt sulfate components. The approach leads to an objective method of detecting volcanic signals in sulfate, even when the signals are much smaller than the sulfate variability caused by other factors. We emphasis the importance of correct statistical analysis the interpretation of ion profiles, taking into account how measurement errors and the distribution of ion chromatography data affects how statistical modelling should be done. |
Description: | IV. Chemical properties and isotopes |
Type: | bulletin (article) |
URI: | http://hdl.handle.net/2115/45455 |
Appears in Collections: | 低温科学 = Low Temperature Science > vol. 68, Supplement Issue
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Submitter: 低温科学研究所図書室
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