Geophysics Department Seminar - Alex Robel: How well can we predict, detect and attribute marine glacier collapse?

Thursday, March 1, 2018

12:00 pm

Mitchell 350/372

Sponsored by:
Geophysics Department

Speaker: Alex Robel

Many marine-terminating glaciers in Greenland and Antarctica are currently retreating and thinning. In this talk, I start by describing a simple mathematical model for the response of marine-terminating glaciers to external climate forcing, which emulates changes simulated in more realistic models. Using a stochastic perturbation approach, I show that the marine ice sheet instability amplifies and skews uncertainty in projections of marine-terminating glacier change for certain vulnerable glaciers in Greenland and Antarctica. This uncertainty amplification is also present in state-of-the-art 3D simulations of marine ice sheet collapse in West Antarctica. Bumpiness of the bed can reduce this uncertainty, indicating that resolution of small-scale subglacial bed topography is critical in estimating uncertainty in future projections of sea level rise. I also show how we can interpret observations of marine-terminating glacier change by estimating the envelope of natural glacier variability expected from climate variability. I conclude by discussing the necessity of ensemble approaches to robustly estimate uncertainty in projections of future sea level rise.

When:
Thursday, March 1, 2018
12:00 pm – 01:15 pm
Where:
Mitchell 350/372
Tags:

Education Environment Engineering Seminar Science 

Audience:
Faculty/Staff, Students, Alumni/Friends, Members
Contact:
650.497.3498, coreyann@stanford.edu