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SUMMARY:Modelling dynamics of the marginal ice zone\, including combined c
ollisional and EVP rheology - Stefanie Rynders (University of Southampton)
DTSTART:20171002T104500Z
DTEND:20171002T113000Z
UID:TALK83181@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Co-authors: Yevgeny Aksenov (National Oceanography Cent
re)\, Daniel Feltham (Centre for Polar Observations and Modeling\, Univer
sity of Reading)\, George Nurser (National Oceanography Centre)
Exposure of large\, previously ice-covered areas of the
Arctic Ocean to the wind and surface ocean waves results in the Arctic pa
ck ice cover becoming more fragmented and mobile\, with large regions of i
ce cover evolving into the Marginal Ice Zone (MIZ). The need for better cl
imate predictions\, along with growing economic activity in the Polar Ocea
ns\, necessitates climate and forecasting models that can simulate fragmen
ted sea ice with greater fidelity. The main focus here is on sea ice rheol
ogy. A Combined Collisional\, reflecting the granular behaviour of MIZ sea
ice\, and Elastic-Viscous-Plastic (EVP) rheology is implemented in an ide
alised and a global sea ice-ocean model. The effect of surface waves on ic
e motion is included in the turbulent kinetic energy or &lsquo\;granular t
emperature&rsquo\; of ice floes. The granular temperature is validated wit
h accelerometer data. It is found that the combined rheology has impact be
yond the marginal ice zone\, influencing ice motion and sea ice thickness
. Taking into account the fragmented nature of MIZ ice also allows for ano
ther dynamical feature of the MIZ: in idealised channel model simulations
ice edge jets occur when variable floe size is used. The research leading
to these results has received funding from the European Union'\;s Seven
th Framework Programme (FP7/2007-2013) under grant agreement n°\; 60747
6.
LOCATION:Seminar Room 1\, Newton Institute
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