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University of Oxford
Andrew Wiles Building
Radcliffe Observatory Quarter
Englacial Pore Water Localizes Shear in Temperate Ice Stream Margins
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE (14 November 2019) Full text available
Ice sheet flow with thermally activated sliding. Part 1: the role of advection.
Proceedings. Mathematical, physical, and engineering sciences issue 2230 volume 475 page 20190410- (23 October 2019)
Response of Marine-Terminating Glaciers to Forcing: Time Scales, Sensitivities, Instabilities, and Stochastic Dynamics
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE issue 9 volume 123 page 2205-2227 (September 2018) Full text available
The role of subtemperate slip in thermally driven ice stream margin migration
CRYOSPHERE issue 8 volume 12 page 2545-2568 (13 August 2018) Full text available
The role of subtemperate slip in thermally-driven ice stream margin migration
The Cryosphere Discussions page 1-35 (13 August 2018)
The effect of buttressing on grounding line dynamics
JOURNAL OF GLACIOLOGY issue 245 volume 64 page 417-431 (June 2018) Full text available
Oscillatory subglacial drainage in the absence of surface melt
CRYOSPHERE issue 3 volume 8 page 959-976 (2014) Full text available
Kinematic first-order calving law implies potential for abrupt ice-shelf retreat
CRYOSPHERE issue 2 volume 6 page 273-286 (2012) Full text available
The Potsdam Parallel Ice Sheet Model (PISM-PIK) - Part 1: Model description
CRYOSPHERE issue 3 volume 5 page 715-726 (2011) Full text available
The goal of my research is to better understand the physical processes that govern the dynamics of ice sheets and glaciers, and to improve the representation of these processes in large-scale ice sheet models. The ice sheets of Greenland and Antarctica together hold the equivalent of 60 m of sea level increase, and understanding their dynamics is essential for projections of future sea level rise. However, many of the processes governing ice sheet dynamics are insufficiently resolved in large-scale ice sheet models. My research projects focus on identifying the main drivers of ice sheet change and deriving parametrizations of these processes suitable for continental-scale ice sheet models.
Current research project: Two-phase dynamics of temperate ice.
Temperate ice is ubiquitous in glaciers and ice sheets, forming where temperatures in the ice sheet reach the melting point. Further addition of heat to temperate ice (for example through internal deformation or warming surface temperatures), leads to the formation of melt water embedded in the ice matrix. Even though the water content within the ice matrix is typically small (a few percent at most), the presence of water drastically alters the mechanical properties of ice. Moreover, water percolating through the ice to the base of the ice sheet can facilitate sliding of the ice along the bed, leading to increased ice discharge. Despite these important implications for ice sheet dynamics, the physical properties of temperate ice are poorly understood. In collaboration with Richard Katz, Ian Hewitt and experimentalists at Iowa State University and the University of Wisconsin-Madison, I am investigating the interactions between ice and water to develop a two-phase, thermo-mechanical theory for temperate ice flow.
Michaelmas 2019: Tutor for C5.11 - Mathematical Geosciences