Natalya Gomez, McGill University-Ice Sheets, Sea Level and the Solid Earth
- Thursday, Nov 12, 2020 12:00 PM
- https://stanford.zoom.us/s/95742837634 Passcode: 840912
- Geophysics Department
Department of Earth & Planetary Sciences, McGill University
Ice Sheets, Sea Level and the Solid Earth
The polar ice sheets in Greenland and Antarctica together hold enough ice to raise global average sea level by over 65 meters, and their response to climate change remains the largest uncertainty in predictions of future sea-level rise. Changes in the cryosphere and their drivers are challenging to constrain for a number of reasons. The solid Earth, water and ice systems are strongly linked, and interactions between these systems are challenging to model and measure as key processes are often buried under the ice and take place on a range of spaciotemporal scales. Modern measurements of these systems contain a large signal from glacial isostatic adjustment (GIA) due to past ice mass changes, but Earth structure, especially beneath areas of active ice sheet retreat in Antarctica, is characterized by significant lateral variability, making the GIA signal challenging to constrain. Finally, the changes we observe in modern measurements do not reflect the large scale, unstable ice sheet-retreat events we may see in our future warmer climate. However, looking to geological records of past ice sheet and sea level evolution in a changing climate can shed light onto the mechanisms and timescales of large scale retreat. This talk will focus on the physics of sea-level changes, glacial isostatic adjustment and solid Earth deformation following ice cover variations, and the implications of these changes on the past and future stability and dynamics of ice sheets and their contributions to sea level.
https://stanford.zoom.us/s/95742837634 Passcode: 840912