Can unconfined ice shelves provide buttressing via hoop stresses?
نویسندگان
چکیده
منابع مشابه
Tidal modulation of ice shelf buttressing stresses
Ocean tides influence the flow of marine-terminating glaciers. Observations indicate that the large fortnightly variations in ice flow at Rutford Ice Stream in West Antarctica originate in the floating ice shelf. We show that nonlinear variations in ice shelf buttressing driven by tides can produce such fortnightly variations in ice flow. These nonlinearities in the tidal modulation of buttress...
متن کاملIce-shelf buttressing and the stability of marine ice sheets
Ice-shelf buttressing and the stability of marinetype ice sheets are investigated numerically. Buttressing effects are analysed for a situation where a stable grounding line is located on a bed sloping upwards in the direction of flow. Such grounding-line positions are known to be unconditionally unstable in the absence of transverse flow variations. It is shown that ice-shelf buttressing can r...
متن کاملTransoceanic infragravity waves impacting Antarctic ice shelves
[1] Long-period oceanic infragravity (IG) waves (ca. [250, 50] s period) are generated along continental coastlines by nonlinear wave interactions of storm-forced shoreward propagating swell. Seismic observations on the Ross Ice Shelf show that free IG waves generated along the Pacific coast of North America propagate transoceanically to Antarctica, where they induce a much higher amplitude she...
متن کاملAssessment of the importance of ice-shelf buttressing to ice-sheet flow
[1] Reduction or loss of a restraining ice shelf will cause speed-up of flow from contiguous ice streams, contributing to sea-level rise, with greater changes from ice streams that are wider, have stickier beds, or have higher driving stress. Loss of buttressing offsetting half of the tendency for icestream/ice-shelf spreading for an ice stream similar to Pine Island Glacier, West Antarctica is...
متن کاملA Dynamic Memory of Fracture Processes in Ice Shelves
Future sea-level rise has the potential to affect a large fractions of the world’s urbanized areas and many generations to come. In order to design suitable mitigation and adaptation measures, accurate sea-level projections are required. Ice dynamics within the Antarctic Ice Sheet constitutes the major uncertainty in state-of-the-art model approaches. Floating ice shelves around the Antarctic c...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Glaciology
سال: 2020
ISSN: 0022-1430,1727-5652
DOI: 10.1017/jog.2019.101