This project addresses the current uncertainty in the present-day contribution of the West Antarctic Ice Sheet to global sea level rise. Estimates of ice mass change from Gravity Recovery and Climate Experiment (GRACE) satellite mission data cannot be separated from total mass change (observed by GRACE). Accurate predictions of mass change within the Earth, due to Antarctic glacial isostatic adjustment (GIA), would allow this, however, but present GIA model accuracy is poor. Global Positioning System (GPS) time series offer important constraints on GIA.
This project has deployed 9 new GPS sites in the southern Antarctic Peninsula (Palmer Land) and will use these and other data to improve models of West Antarctic GIA. This will allow us to compute new accurate and precise estimates of ice mass contributions to sea level rise from West Antarctica.