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Summary of Proposal GEO1441

TitleEstimating melting rates of major arctic ice sheet using TerraSAR-X InSAR and pixel tracking
Investigator Amelung, Falk - University of Miami, Division of Marine Geology and Geophysics
Team Member
Dr. Motagh, Mahdi - GFZ German Research Center for Geosciences, Department of Geodesy and Remote Sensing
Dr Hong, Sang-Hoon - Korea Polar Research Institute, Division of Polar Ocean Environment
SummaryGlobal sea-level is rising because the Earth’s ice sheets and glaciers are melting caused by global warming. The principal contributors to sea level rise are the Greenland ice sheet and the smaller ice-sheets in the arctic region such as in northeast Canada and Iceland. The estimation of contemporaneous melting rates is one of the top priorities of climate change research. Precise melting rates serve to calibrate climate change and ice loss models and are critical for global sea-level projections. We propose to estimate melting rates through TerraSAR-X measurements of ground uplift along the margins of major arctic ice sheets. We will use time-series interferometry to estimate relative changes and image correlation techniques to estimate the total uplift, respectively. The combination of these two techniques will resolve both, the instantaneous, elastic rebound of the Earth’s crust in response to melting, and the delayed visco-elastic flow in the Earth’s mantle. Ground truth is provided by the Greenland GPS network (G-Net). The relative InSAR measurements resolve the short-wavelength differential rebound along the margins of ice sheet caused by the gradient in ice loss towards the sheet’s interior. The absolute displacement measurements from image correlation resolve long wavelength deformation due to visco-elastic flow in the Earth’s mantle resulting in long wavelength ground uplift. We request a regular account for an initial proof of concept study and a background acquisition account to acquire data sets for future studies.

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