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Slowdown in Antarctic mass loss from solid Earth and sea-level feedbacks
E Larour1,2, H Seroussi3, S Adhikari3
1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. eric.larour@jpl.nasa.gov.
Science (New York, N.Y.)
|April 27, 2019
Summary
Solid-Earth uplift stabilizes polar ice sheets. New simulations show this effect reduces Thwaites Glacier
Area of Science:
- Solid Earth physics
- Glaciology
- Antarctic climate science
Background:
- Geodetic studies reveal solid-Earth uplift stabilizes polar ice sheets.
- The impact of short-wavelength uplift near grounding lines remains unassessed.
Purpose of the Study:
- To simulate Antarctic ice sheet evolution considering solid-Earth processes.
- To assess the influence of short-term solid-Earth uplift on grounding line migration.
Main Methods:
- Developed a high-resolution global simulation of Antarctic ice sheet evolution.
- Incorporated all relevant solid-Earth processes affecting ice sheets.
Main Results:
- Projected a 38% negative feedback in grounding line migration for Thwaites Glacier.
- This feedback corresponds to a 26.8% reduction in sea-level contribution.
Conclusions:
- Short-wavelength solid-Earth uplift significantly impacts grounding line stability.
- This mechanism offers a crucial stabilizing feedback for Antarctic ice sheets.
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