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SUMMARY:Modelling sea ice dynamics using brittle dynamics: impact in pack 
 ice and marginal ice zones - Guillaume Boutin (Nansen Environmental and Re
 mote Sensing Center)
DTSTART:20250129T140000Z
DTEND:20250129T150000Z
UID:TALK225643@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:Sea ice dynamics are highly complex and generally poorly resol
 ved by sea ice models. This is problematic\, as they modulate the amount o
 f momentum exchanged between the atmosphere and the ocean in polar regions
 \, as well as play a key role in heat and light fluxes through the opening
 /closing of sea ice leads. A solution to improve simulated sea ice dynamic
 s is to use a brittle rheology to represent the mechanical behaviour of se
 a ice. Such rheology is included in the sea ice model neXtSIM\, and we dem
 onstrated its ability to capture the observed characteristics and complexi
 ty of fine-scale sea ice deformations.Here\, we present two cases where we
  coupled this sea ice model to better understand the role of ice dynamics 
 in ice-ocean interactions.\n\nIn the first case\, we set up a 12km resolut
 ion ocean--sea-ice coupled model\, using OPA\, the ocean component of NEMO
 . We investigate the sea ice mass balance of the model for the period 2000
 -2018. We estimate the contribution of leads and polynyas to winter ice pr
 oduction. We find this contribution to add up from 25% to 35% of the total
  ice growth in pack ice in winter\, showing a significant increase over th
 e 18 years covered by the model simulation.\n\nIn the second case\, we foc
 us on the marginal ice zone (MIZ) and couple neXtSIM with the wave model W
 AVEWATCH III. We investigate how wave-induced breakup impacts sea ice dyna
 mics in the MIZ. We show how\, using the “damage” quantity that is at 
 the core of the brittle rheology framework\, we can represent the loss of 
 ice strength associated with wave-induced breakup\, and how breakup can in
 crease the mobility of the thickest ice in the MIZ after storms. For both 
 cases\, we will also discuss briefly how using a brittle sea ice model cou
 ld impact the modelling of Antarctic sea ice using preliminary results fro
 m a new configuration.
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/97264211524
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