Geophysics Department Seminar - Christine McCarthy: Tidal Controls on Ice Stream Speed and Stability
- Thursday, May 2, 2019 12:00 PM
- Mitchell 350/372
- Faculty/Staff, Students, Alumni/Friends, Members
- Geophysics Department
Speaker: Christine McCarthy; Research Professor at Lamont Doherty Earth Observatory
Ice streams represent a significant portion of the Antarctic ice mass balance. Understanding the controls on their flow and sliding rates are critical to predictive modeling of sea level rise. In my laboratory experiments I measure the frictional properties that control basal sliding. In particular, I will present results from ice-on-rock friction experiments in which the driving velocity was periodic, representing tidal modulation. Using the formulation of rate- and state- dependent friction that has been used to describe earthquakes and fault dynamics for decades, and the parameters gleaned from experiments, we are able to describe the full range of sliding behavior (from creeping to modulation to episodic stick-slip) observed both in the lab and in nature.