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

Date and Time: 
March 1, 2018 -
12:00pm to 1:15pm
Location: 
Mitchell 350/372
Contact Email: 
coreyann@stanford.edu
Contact Phone: 
650.497.3498
Event Sponsor: 
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.