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- W2084902172 abstract "The North Polar Layered Deposits (PLD) of Mars are climatologically significant because they represent the largest actively-exchanging reservoir of martian water. The kilometer-scale topography of the North PLD is dominated by troughs and scarps, which exhibit highly-correlated surface slopes and total depths. The most widespread theories of PLD evolution presume that the asymmetrical nature of North PLD troughs (characterized by equatorward-facing slopes that are generally steeper than poleward-facing slopes) is the result of preferential H2O sublimation from equatorward-facing trough walls. However, our orbitally-modulated simulations indicate that there is no long-term sublimation advantage of equatorward-facing trough walls, because of the effects of obliquity upon the slope dependence of sublimation rate. In contrast, we propose that viscous relaxation of subsurface water is consistent with the slope and depth distributions of North PLD troughs and scarps. The results of our finite element simulations suggest that a mere 2 K difference in the subsurface temperatures of opposing trough walls is sufficient to produce the observed slope disparity, due to the slower rate of uplift of colder poleward-facing trough walls. Both our sublimation and relaxation simulations indicate that present-day North PLD troughs have formed since 5 Ma and are not sites of long-term deposition; additionally, our results imply that glacial flow may govern the large-scale evolution of the North PLD, especially at high obliquity." @default.
- W2084902172 created "2016-06-24" @default.
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- W2084902172 date "2005-04-01" @default.
- W2084902172 modified "2023-09-27" @default.
- W2084902172 title "The effects of martian orbital variations upon the sublimation and relaxation of north polar troughs and scarps" @default.
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- W2084902172 doi "https://doi.org/10.1016/j.icarus.2004.10.030" @default.
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