2005
DOI: 10.1029/2004jf000170
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Parameter sensitivity studies for the ice flow of the Ross Ice Shelf, Antarctica

Abstract: [1] The diagnostic, dynamic/thermodynamic ice shelf model Finite Element Shallow Shelf Approximation Code (FESSACODE) is applied to the Ross Ice Shelf. We simulate the present ice flow which results from the ice thickness distribution, the inflow at the grounding line, and the surface and bottom temperatures and compare results with measured flow velocities. Our reference simulation reproduces the general flow pattern and the magnitudes of the flow velocities reasonably well. The ice flow is found to be very s… Show more

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Cited by 18 publications
(10 citation statements)
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“…The parabolic shape mimics temperature profiles observed in large ice shelves. This is similar to the approach of Humbert et al [2005], although those authors use a colder (clear-sky only) T s than is used in the present work. T(z) could also be estimated with a linear shape function for T(z) or by specifying T(z) at inflow boundaries and including energy balance in the model equations.…”
Section: Modelmentioning
confidence: 73%
“…The parabolic shape mimics temperature profiles observed in large ice shelves. This is similar to the approach of Humbert et al [2005], although those authors use a colder (clear-sky only) T s than is used in the present work. T(z) could also be estimated with a linear shape function for T(z) or by specifying T(z) at inflow boundaries and including energy balance in the model equations.…”
Section: Modelmentioning
confidence: 73%
“…Such changes were observed for the Wordie Ice Shelf, which disintegrated during the 1980s after several years of net ablation (Doake & Vaughan 1991), and it is likely that the northern and southern portions of GVI-IS are undergoing and will continue to undergo a similar style of retreat as long as atmospheric temperatures continue to rise. In addition to ice surface changes associated with net ablation, modelling studies suggest that ice shelf flow velocities increase under a warming climate resulting in negative mass balance and ice shelf retreat (Humbert et al 2005). It remains uncertain whether the flow velocity of GVI-IS has changed in recent decades.…”
Section: Atmospheric or Oceanic Driven Retreat?mentioning
confidence: 99%
“…[3] Knowledge of the thermal state of today's ice shelves is primarily restricted to those in "cold" ocean conditions, where in situ borehole temperature measurements have been taken [Zotikov et al, 1980;Orheim et al, 1990]. This thermal state also has impact on ice shelf melting and flow, with flow being dependent on ice temperature through ice viscosity [e.g., MacAyeal and Thomas, 1986;Humbert et al, 2005]. However, it remains unclear what thermal regimes ice shelves should have in different ocean environments, and to what degree differences in basal melting rates can be attributed to differences in ocean environment or to differences in ice shelf thermal state.…”
Section: Introductionmentioning
confidence: 99%