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- W2059098701 abstract "[1] Cross-borehole DC resistivity tomography has recently been used to monitor the temporal variation of the anisotropic bulk electrical resistivity of first-year Arctic sea ice during the period of spring warming. These measurements cannot be explained by standard models of sea ice microstructure which treat the brine phase as isolated ellipsoidal pores. A simple structural model which does satisfy the observed electrical data shows that the brine phase must be connected both vertically and horizontally. Calculation of the temporal and thermal evolution of the microstructure suggests that although vertical connectivity is through pore tubes and sheets with widths of ∼100 μm, horizontal connectivity is through much thinner connections which are interpreted as inter- and intragranular brine layers. As the temperature increases the width of vertical channels increases smoothly. In contrast, at temperatures above about −2°C there is a rapid increase in the thickness of horizontal connections which we interpret as a change from conduction through intergranular brine layers to the development of horizontal pores. The electrical data also broadly exhibit a percolation transition predicted by mathematical models. However, the critical brine volume fraction for vertical electrical connection is very small, while that for horizontal electrical connection is derived to be about 0.5%. The difference between these and the critical threshold of 5% for fluid permeability is presumed to arise because of the strong dependence of the latter on brine channel width." @default.
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- W2059098701 date "2012-02-01" @default.
- W2059098701 modified "2023-09-23" @default.
- W2059098701 title "Modeling the anisotropic brine microstructure in first-year Arctic sea ice" @default.
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- W2059098701 doi "https://doi.org/10.1029/2011jc007607" @default.
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