Zobrazeno 1 - 10
of 443
pro vyhledávání: '"subglacial processes"'
Publikováno v:
Arctic, Antarctic, and Alpine Research, Vol 56, Iss 1 (2024)
This study presents the results of mathematical modeling of the degree of effects of various characteristics on basal conditions in Antarctica. The model is based on the numerical solution of the one-dimensional Stefan problem. Five factors determini
Externí odkaz:
https://doaj.org/article/0d4185622b644e53a61b4b07a0a9c9f2
Autor:
Byron R. Parizek
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 15, Pp n/a-n/a (2024)
Abstract Projections of sea‐level rise from ice‐sheet shrinkage in a warming world have large uncertainties, linked to limited knowledge of changes at the ocean‐ice sheet interface. This interface most typically is modeled as a grounding line,
Externí odkaz:
https://doaj.org/article/8527389dcd2a44d7ba11325d9f88fe1f
Publikováno v:
Geophysical Research Letters, Vol 51, Iss 12, Pp n/a-n/a (2024)
Abstract Glaciers and ice streams flowing over sediment beds commonly have a layer of ice‐rich debris adhered to their base, known as a “frozen fringe,” but its impact on basal friction is unknown. We simulated basal slip over granular beds wit
Externí odkaz:
https://doaj.org/article/569e0f00de0c4fe2837999a4e0d68660
Autor:
Signe H. Larsen, Andreas P. Ahlstrøm, Nanna B. Karlsson, Anders Kusk, Peter L. Langen, Christine S. Hvidberg
Publikováno v:
Journal of Glaciology, Vol 69, Pp 1047-1055 (2023)
The dynamics of the Greenland Ice Sheet are affected by surface meltwater reaching the base of the ice, altering ice contact with the bedrock. Lack of understanding of this evolution hampers the ability to predict the effects of increasing temperatur
Externí odkaz:
https://doaj.org/article/562a32088b72486bbcacee8b3f9e523c
Publikováno v:
Journal of Glaciology, Vol 69, Pp 1056-1070 (2023)
Spatially variable basal conditions are thought to govern how ice sheets behave at glacial time scales (>1000 years) and responsible for changes in dynamics between the core and peripheral regions of the Laurentide and Fennoscandian ice sheets. Basal
Externí odkaz:
https://doaj.org/article/779fe7048a96419c86cf931a68a14d11
Publikováno v:
Annals of Glaciology, Vol 64, Pp 13-25 (2023)
Small quantities of liquid water lining triple junctions in polycrystalline glacier ice form connected vein networks that enable material exchange with underlying basal environments. Diffuse debris concentrations commonly observed in ice marginal reg
Externí odkaz:
https://doaj.org/article/48036921f0524bf3891b1b31f670e030
Publikováno v:
Journal of Glaciology, Vol 69, Pp 324-332 (2023)
Sea-level projections depend sensitively on the parameterization used for basal slip in glacier flow models. During slip over rock-beds, ice-bed separation increases with slip velocity and basal water pressure. We present a method for using these var
Externí odkaz:
https://doaj.org/article/1babfa244280441988a293ca2d20d2cb
Autor:
David Stevens, Jeremy C. Ely, Stephen J. Livingstone, Chris D. Clark, Frances E. G. Butcher, Ian Hewitt
Publikováno v:
Journal of Glaciology, Vol 69, Pp 397-409 (2023)
We use a mathematical model to investigate the effect of basal topography and ice surface slope on transport and deposition of sediment within a water-filled subglacial channel. In our model, three zones of different behaviour occur. In the zone furt
Externí odkaz:
https://doaj.org/article/c59b7032f5364ab5af694bd8238cb5d2
Publikováno v:
Journal of Glaciology, Vol 69, Pp 103-119 (2023)
Glacial ripping involves glaciotectonic disintegration of rock hills and extensive removal of rock at the ice-sheet bed, triggered by hydraulic jacking caused by fluctuating water pressures. Evidence from eastern Sweden shows that glacial ripping cau
Externí odkaz:
https://doaj.org/article/3c817f51da64492bba4fe6abb0f1b5ba
Publikováno v:
Journal of Glaciology, Vol 68, Pp 1177-1184 (2022)
Increasing ice flux from glaciers retreating over deepening (retrograde) bed topography has been implicated in the recent acceleration of mass loss from the Greenland and Antarctic ice sheets. We show in observations that some glaciers have remained
Externí odkaz:
https://doaj.org/article/9eef1526afdc4bceb7bb9b63a0e620ba