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SUMMARY:Ice streams: fantastic beasts and how to model them - Elisa Mantel
 li\, Princeton University
DTSTART:20200603T150000Z
DTEND:20200603T160000Z
UID:TALK142660@talks.cam.ac.uk
CONTACT:Louis Couston
DESCRIPTION:Flow organization into systems of narrow\, fast-flowing ice st
 reams\, is a well-known feature of ice sheets. A quintessential aspect of 
 these ice streams is that they can emerge spontaneously out of an otherwis
 e uniform flow\, self-organize in evenly spaced patterns\, and switch on a
 nd off over time\, with major implications for the mass balance of ice she
 ets. While these dynamics render ice streams fascinating\, they are also d
 eeply troublesome. In fact\, our understanding of the physics driving them
  is far from complete\, thus impeding attempts to model future ice sheet b
 ehavior numerically over timescales longer than a few decades. In this tal
 k\, I strip away much of the sophistication involved in `operational’ ic
 e sheet models to look at the necessary ingredients to capture ice stream 
 dynamics in minimal continuum models. I will first identify the basic feed
 backs responsible for oscillations in streaming flow\, and how natural var
 iability in climate forcing affects them. I will then delve into the spati
 al dynamics of ice streams\, outlining how ice flow localization into dist
 inct ice streams may emerge as an instability of the transition in space f
 rom a frozen ice sheet bed\, where no sliding can occur\, to a temperate o
 ne\, where sliding dominates the motion of the ice.
LOCATION:British Antarctic Survey\, Zoom
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