The Influence of Solid Earth Properties on the Deglacial Evolution of the Greenland Ice Sheet
Abstract
Ice sheets interact with the solid Earth in many respects that influence how a given ice sheet will evolve over time for a particular climate forcing. In this presentation, we will consider the influence of geothermal heat flux and spatial variations in relative sea level on the millennial-scale evolution of the Greenland ice sheet from the last glacial maximum to the present day. The primary tool for our sensitivity study is the open-source Parallel Ice Sheet Model (PISM; Bueler and Brown, Journal of Geophysical Research, 2009). The influence of geothermal heat flux is quantified by adopting three published estimates of this spatial field as boundary conditions for a series of model runs using different climate forcings and spatial (grid) resolution. The influence of relative sea-level change is computed by coupling PISM to a glacial isostatic adjustment model that solves the sea-level equation. We quantify the impact of this forcing/feedback on deglacial model simulations for different climate forcings and spatial (grid) resolution. The implications of our results will be summarised with respect to our primary aim of satisfying both geological (ice extent and relative sea level changes) and geodetic (contemporary land uplift) constraints on the deglacial ice sheet evolution and solid Earth response.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.C14B..05M
- Keywords:
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- 0726 Ice sheets;
- CRYOSPHERE;
- 0774 Dynamics;
- CRYOSPHERE;
- 1209 Tectonic deformation;
- GEODESY AND GRAVITY;
- 8124 Earth's interior: composition and state;
- TECTONOPHYSICS