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• W1968085013 abstract "Abstract To date, studies of the stability of subsurface ice in the McMurdo Dry Valleys of Antarctica have been mainly based on climate-based vapor diffusion models. In University Valley (1800 m), a small glacier is found at the base of the head of the valley, and adjacent to the glacier, a buried body of massive ice was uncovered beneath 20–40 cm of loose cryotic sediments and sandstone boulders. This study assesses the origin and stability of the buried body of massive ice by measuring the geochemistry and stable O–H isotope composition of the ice and applies a sublimation and molecular diffusion model that accounts for the observed trends. The results indicate that the buried massive ice body represents an extension of the adjacent glacier that was buried by a rock avalanche during a cold climate period. The contrasting δ 18 O profiles and regression slope values between the uppermost 6 cm of the buried massive ice (upward convex δ 18 O profile and S D-18O  = 5.1) and that below it (progressive increase in δ 18 O and S D-18O  = 6.4) suggest independent post-depositional processes affected the isotope composition of the ice. The upward convex δ 18 O profile in the uppermost 6 cm is consistent with the ice undergoing sublimation. Using a sublimation and molecular diffusion model, and assuming that diffusion occurred through solid ice, the sublimation rate needed to fit the measured δ 18 O profile is 0.2 ⋅ 10 − 3  mm yr − 1 , a value that is more similar to net ice removal rates derived from 3 He data from cobbles in Beacon Valley till (7.0 ⋅ 10 − 3  mm yr − 1 ) than sublimation rates computed based on current climate (0.1–0.2 mm yr −1 ). We suggest that the climate-based sublimation rates are offset due to potential ice recharge mechanisms or to missing parameters, particularly the nature and thermo-physical properties of the overlying sediments (i.e., temperature, humidity, pore structure and ice content, grain size)." @default.
• W1968085013 created "2016-06-24" @default.
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• W1968085013 date "2011-01-01" @default.
• W1968085013 modified "2023-10-14" @default.
• W1968085013 title "Stability of massive ground ice bodies in University Valley, McMurdo Dry Valleys of Antarctica: Using stable O–H isotope as tracers of sublimation in hyper-arid regions" @default.
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• W1968085013 doi "https://doi.org/10.1016/j.epsl.2010.11.028" @default.
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