Premelting increases the rate of regelation by an order of magnitude

Author:

REMPEL ALAN W.,MEYER COLIN R.

Abstract

ABSTRACTGlacier sliding over small obstacles relies on melting on their upstream sides and refreezing downstream. Previous treatments have appealed to ‘pressure melting’ as the cause of the spatial variations in melting temperature that drive thisregelationprocess. However, we show that typical liquid pressure variations across small obstacles are negligible and therefore variations in ice pressure closely approximate variations in effective stress. For a given change in effective stress, the equilibrium melting temperature changes by an order of magnitude more than when the pressure of ice and liquid both change by an equal amount. In consequence, the temperature gradients that drive heat flow across small obstacles are larger than previously recognized and the rate of regelation is faster. Under typical conditions, the transition wavelength at which ice deformation and regelation contribute equally is of m-scale, several times longer than previous predictions, which have been reported to underestimate field inferences.

Publisher

Cambridge University Press (CUP)

Subject

Earth-Surface Processes

Cited by 15 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Glacier and ice sheet flow;Geophysical & Astrophysical Fluid Dynamics;2024-08-28

2. Subtemperate regelation exhibits power-law premelting;Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences;2024-05

3. Subglacial hydrology modeling predicts high winter water pressure and spatially variable transmissivity at Helheim Glacier, Greenland;Journal of Glaciology;2023-06-21

4. A thermomechanical model for frost heave and subglacial frozen fringe;Journal of Fluid Mechanics;2023-06-07

5. Stress accumulation by confined ice in a temperature gradient;Proceedings of the National Academy of Sciences;2022-07-29

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