Ice shelf margin Typical values: • Tidal amplitude ≈ 3 − 5 m • Width of hinge zone ≈ 1 − 10 km Hinge zones
Grounded ice sheet: supported, unaffected by tides Floating ice shelf: constant motion (with tides) Hinge zone:- hydrostatic pressure & internal stresses- cyclic flexure- differential movement Tidal flexure implications • Power dissipated from global tides into ice hinge zones → rheology governi...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Text |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.650.6512 http://topex.ucsd.edu/geodynamics/HW6_2013_presentations/A_ice_flexure.pdf |
| Summary: | Grounded ice sheet: supported, unaffected by tides Floating ice shelf: constant motion (with tides) Hinge zone:- hydrostatic pressure & internal stresses- cyclic flexure- differential movement Tidal flexure implications • Power dissipated from global tides into ice hinge zones → rheology governing flexure • Ice shelf flow influenced by repeated straining in hinge zones → mechanism & magnitude of flexure • InSAR measurements of ice sheet velocities → model and remove tidal displacements in the hinge zone • Ice shelf evolution linked to sea tides → determine limits of tidal range Elastic beam model Robin [1958]: Positions of surface cracks and regions of maximum stress coincide |
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