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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Modelling dynamics of the marginal ice zone\, incl
uding combined collisional and EVP rheology - Stef
anie Rynders (University of Southampton)
DTSTART;TZID=Europe/London:20171002T114500
DTEND;TZID=Europe/London:20171002T123000
UID:TALK83181AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/83181
DESCRIPTION:Co-authors: Yevgeny Aksenov (National Ocean
ography Centre)\, Daniel Feltham (Centre for Pola
r Observations and Modeling\, University of Readin
g)\, George Nurser (National Oceanography Centre)
Exposure of large\, p
reviously ice-covered areas of the Arctic Ocean to
the wind and surface ocean waves results in the A
rctic pack ice cover becoming more fragmented and
mobile\, with large regions of ice cover evolving
into the Marginal Ice Zone (MIZ). The need for bet
ter climate predictions\, along with growing econo
mic activity in the Polar Oceans\, necessitates cl
imate and forecasting models that can simulate fra
gmented sea ice with greater fidelity. The main fo
cus here is on sea ice rheology. A Combined Collis
ional\, reflecting the granular behaviour of MIZ s
ea ice\, and Elastic-Viscous-Plastic (EVP) rheolog
y is implemented in an idealised and a global sea
ice-ocean model. The effect of surface waves on ic
e motion is included in the turbulent kinetic ener
gy or &lsquo\;granular temperature&rsquo\; of ice
floes. The granular temperature is validated with
accelerometer data. It is found that the combined
rheology has impact beyond the marginal ice zone\,
influencing ice motion and sea ice thickness. Ta
king into account the fragmented nature of MIZ ice
also allows for another dynamical feature of the
MIZ: in idealised channel model simulations ice ed
ge jets occur when variable floe size is used. The
research leading to these results has received fu
nding from the European Union'\;s Seventh Frame
work Programme (FP7/2007-2013) under grant agreeme
nt n°\; 607476.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:INI IT
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