Calving Ice Walls
نویسندگان
چکیده
منابع مشابه
Calving and rifting on the McMurdo Ice Shelf, Antarctica
On 2 March 2016, several small en échelon tabular icebergs calved from the seaward front of the McMurdo Ice Shelf, and a previously inactive rift widened and propagated by ∼3 km, ∼25% of its previous length, setting the stage for the future calving of a∼14 km iceberg. Within 24 h of these events, all remaining land-fast sea ice that had been stabilizing the ice shelf broke-up. The events were w...
متن کاملCalving of large tabular icebergs from ice shelf rift systems
[1] We used Interferometric Synthetic Aperture Radar to study the detachment process that allowed two large icebergs to calve from the Ross Ice Shelf, Antarctica. Time series of rift geometries indicate that rift widths increased steadily, whereas rift lengths increased episodically through several discrete rift-tip propagation events. We also conducted modeling experiments constrained by the o...
متن کاملParameterization for subgrid-scale motion of ice-shelf calving fronts
A parameterization for the motion of ice-shelf fronts on a Cartesian grid in finite-difference land-ice models is presented. The scheme prevents artificial thinning of the ice shelf at its edge, which occurs due to the finite resolution of the model. The intuitive numerical implementation diminishes numerical dispersion at the ice front and enables the application of physical boundary condition...
متن کاملKinematic first-order calving law implies potential for abrupt ice-shelf retreat
Recently observed large-scale disintegration of Antarctic ice shelves has moved their fronts closer towards grounded ice. In response, ice-sheet discharge into the ocean has accelerated, contributing to global sea-level rise and emphasizing the importance of calving-front dynamics. The position of the ice front strongly influences the stress field within the entire sheet-shelf-system and thereb...
متن کاملIce sheets. Reverse glacier motion during iceberg calving and the cause of glacial earthquakes.
Nearly half of Greenland's mass loss occurs through iceberg calving, but the physical mechanisms operating during calving are poorly known and in situ observations are sparse. We show that calving at Greenland's Helheim Glacier causes a minutes-long reversal of the glacier's horizontal flow and a downward deflection of its terminus. The reverse motion results from the horizontal force caused by...
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ژورنال
عنوان ژورنال: Annals of Glaciology
سال: 1989
ISSN: 0260-3055,1727-5644
DOI: 10.3189/s0260305500006984