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SUMMARY:How important is sea ice divergence? - Harry Heorton\, UCL
DTSTART:20220302T140000Z
DTEND:20220302T150000Z
UID:TALK169250@talks.cam.ac.uk
CONTACT:Dr. Shenjie Zhou
DESCRIPTION:Sea-ice floating upon the Arctic ocean is a constantly moving\
 , growing\, and melting surface. The seasonal cycle of sea ice volume has 
 an average change of 10\,000 Km^3 or 9 billion tonnes of sea ice. The role
  of dynamic redistribution of sea ice\, the process by which it flows and 
 deforms when blown by winds and floating upon ocean currents\, is responsi
 ble for distribution of thicker multi-year ice and has high interannual va
 riability. Due to the rheology of sea-ice\, when drifting and deforming\, 
 positive divergence is more likely than negative\, with a greater area of 
 leads than ice ridges. The formation of leads in winter months exposes the
  open ocean to the cold atmosphere causing the rapid formation of new ice.
  \n\nHere we investigate the role of dynamics processes within Artic sea i
 ce using both observational and modelling studies. We combine satellite-de
 rived observations of sea ice concentration\, drift\, and thickness to pro
 vide maps if ice growth\, melt and dynamic redistribution. Ten winter grow
 th and summer melt seasons are analysed over the CryoSat-2 period between 
 October 2010 and April 2020. We extend this analysis to future scenarios b
 y looking at the modelled dynamics of Arctic sea-ice in CMIP6 models. Thes
 e models allow us to consider the changing role of sea ice divergence with
 in a rapidly changing Arctic.
LOCATION:https://ukri.zoom.us/j/95596949731\; BAS seminar room 1
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