30 September 2019 to 3 October 2019
The Royal Danish Academy of Sciences and Letters
Europe/Copenhagen timezone

Impurities effect on borehole closure rate in ice sheet

30 Sep 2019, 17:56
4m
The Royal Danish Academy of Sciences and Letters

The Royal Danish Academy of Sciences and Letters

The Royal Danish Academy of Sciences and Letters H.C. Andersens Boulevard 35 DK-1553 Copenhagen V Denmark
Poster Session 2

Speaker

Jialin HONG (Polar Research Center, Jilin University, Changchun, China)

Description

Understanding ice sheet dynamics is of high interest to predict the future ice sheet response in times of changing climate, and is also crucial to estimate borehole closure rate during accessing ice sheet especially by deep ice core drilling. Impurities in ice is one of the most influential factors on mechanical properties of ice and causes localized enhanced deformation. High concentrations of impurities is the main driver for development of strong crystal prefrred orientation, fine grain sizes and for decreasing pressure melting point, which favors the borehole clousre rate signaficantly particularly when ice temperature is above -10 ℃. While the control mechanism of impurities on ice deformation rate is still remains much unclear. Thus, we propose to investigate various species and concentrations of impurities effect on ice creep rate between -15 ℃ to -5 ℃ using bubble free, labratory-made polycrystalline ice obtained by isotropic freezing method, in order to figure out the critical species and concentrations of impurities on borehole closure rate.

Primary author

Jialin HONG (Polar Research Center, Jilin University, Changchun, China)

Co-authors

Prof. Pavel Talalay (Jilin University) Mr Mihail Sysoev (Polar Research Center, Jilin University, Changchun, China)

Presentation Materials

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