TY - JOUR
T1 - Ice-shelf flexure and tidal forcing of Bindschadler Ice Stream, West Antarctica
AU - Walker, Ryan T.
AU - Parizek, Byron R.
AU - Alley, Richard B.
AU - Brunt, Kelly M.
AU - Anandakrishnan, Sridhar
N1 - Funding Information:
This research was supported by NSF under grants 0424589 (R.B.A., B.R.P.), 1338832 (R.B.A., B.R.P.), and 0944286 (R.B.A.), and by NASA under grants NNX10AI04G (R.B.A., B.R.P., R.T.W.), NNX12AD03A (R.T.W.), NNX12AP50G (R.T.W.), and the NASA Science Innovation Fund (K.M.B.).
PY - 2014/6/1
Y1 - 2014/6/1
N2 - Viscoelastic models of ice-shelf flexure and ice-stream velocity perturbations are combined into a single efficient flowline model to study tidal forcing of grounded ice. The magnitude and timing of ice-stream response to tidally driven changes in hydrostatic pressure and/or basal drag are found to depend significantly on bed rheology, with only a perfectly plastic bed allowing instantaneous velocity response at the grounding line. The model can reasonably reproduce GPS observations near the grounding zone of Bindschadler Ice Stream (formerly Ice Stream D) on semidiurnal time scales; however, other forcings such as tidally driven ice-shelf slope transverse to the flowline and flexurally driven till deformation must also be considered if diurnal motion is to be matched.
AB - Viscoelastic models of ice-shelf flexure and ice-stream velocity perturbations are combined into a single efficient flowline model to study tidal forcing of grounded ice. The magnitude and timing of ice-stream response to tidally driven changes in hydrostatic pressure and/or basal drag are found to depend significantly on bed rheology, with only a perfectly plastic bed allowing instantaneous velocity response at the grounding line. The model can reasonably reproduce GPS observations near the grounding zone of Bindschadler Ice Stream (formerly Ice Stream D) on semidiurnal time scales; however, other forcings such as tidally driven ice-shelf slope transverse to the flowline and flexurally driven till deformation must also be considered if diurnal motion is to be matched.
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U2 - 10.1016/j.epsl.2014.03.049
DO - 10.1016/j.epsl.2014.03.049
M3 - Article
AN - SCOPUS:84897949845
SN - 0012-821X
VL - 395
SP - 184
EP - 193
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
ER -