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Kate Bollen Thesis Proposal

September 23 @ 3:00 pm - 5:00 pm MDT

Kate Bollen

Quantification and analysis of dynamic mass loss from Greenland’s peripheral glaciers

While global glacier mass balance has decreased rapidly over the last two decades, mass loss has been greater in regions with marine-terminating glaciers. In Greenland, peripheral glaciers and ice caps cover only ~5% of Greenland’s area but contributed ~14-20% of the continent’s ice mass loss between 2003-2008. Although these glaciers’ contributions of surface meltwater runoff to regional ice mass loss have been estimated using atmospheric models, mass loss due to changes in glacier terminus position and accelerated ice flow remains unquantified. Here, I will employ an automated terminus-tracking algorithm to identify the terminus positions of 641 marine-terminating peripheral Greenland glaciers using Landsat 7 & 8 panchromatic imagery. These terminus time series, combined with ice velocity and ice thickness time series, will be used to quantify ice discharge from Greenland’s peripheral glaciers. Specifically, I will investigate how terminus retreat and ice flow acceleration have contributed to mass loss, and compare the spatial and temporal sensitivity between these peripheral glaciers and the ice sheet’s outlet glaciers to atmospheric and oceanic forcing. This analysis will inform predictions of future global land ice volume and sea level rise.

Advisor: Ellyn Enderlin

Co-Advisors: HP Marshall, Dylan Mikesell

When: Wednesday, September 23, 2020
Time: 3:00 PM
Where: Zoom Meeting ID: 989 8327 7624 Passcode: 714569