Why marine ice sheet model predictions may diverge in estimating future sea level rise
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Material Information

Title:
Why marine ice sheet model predictions may diverge in estimating future sea level rise
Series Title:
Geophysical Research Letters, Volume 40
Creator:
Pattyn, Frank
Durand, Gael
Publisher:
American Geophysical Union
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Climate change ( lcsh )
Ice sheets ( lcsh )
Sea level rise ( lcsh )
Ice shelves ( lcsh )

Notes

Abstract:
Despite major recent efforts, marine ice sheet models aiming at predicting future mass loss from ice sheets still suffer from uncertainties with respect to grounding line migration. A recent model intercomparison provided tools to test how models treat grounding line dynamics in a three-dimensional setting. Here we use these tools to address to what extent differences in mass loss occur according to the approximation to the Stokes equations, describing marine ice sheet flow, used. We find that models that neglect components of vertical shearing in the force budget wrongly estimate ice sheet mass loss by ˙50% over century time scales when compared to models that solve the full Stokes system of equations. Models that only include horizontal stresses also misrepresent velocities and ice shelf geometry, suggesting that interactions between the grounded ice sheet and the ocean will also be modeled incorrectly. Based on these findings, we strongly advise the use of high-order models to compute reliable projections of ice sheet contribution to sea level rise. ( English )

Record Information

Source Institution:
Florida International University
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Sea Level Rise