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UID:20250731T050234EDT-1981824feT@132.216.98.100
DTSTAMP:20250731T090234Z
DESCRIPTION: \n\nStudent Seminar Series\n\nDepartment of Atmospheric & Ocea
 nic Sciences\n\npresents\n\na talk by\n\nJoe Lockwood\n	MSc student\n\nOn t
 he role of the Antarctic Slope Front on the occurrence of the Weddell Sea 
 polynya under climate change\n\nPolynyas\, which are large holes in sea ic
 e\, are believed to have a significant impact on the climate through feedb
 ack with the atmosphere and modification of the global ocean circulation. 
 A study by de Lavergne et al. (2014) found that CMIP5 models predict a slo
 w down or even cessation of these events into the future due to ocean fres
 hening. Here we revisit the conclusion of a cessation of the Weddell Sea P
 olynya (WSP) under climate change. We hypothesis that\, because of their r
 elatively coarse resolutions in the ocean\, CMIP5 models are unable to cap
 ture important processes involved in the formation of the polynyas and in 
 their response to climate change. To investigate that hypothesis\, we use 
 pre-industrial control and 1%CO2 rise/year simulations of the high resolut
 ion GFDL CM2.6 and of the CMIP5 models that form polynyas in the Weddell S
 ea to investigate the response of the polynya to climate change. We find t
 hat\, under climate change\, CM2.6 forms WSP at the same time and with the
  same duration as under preindustrial forcing. In contrast\, the CMIP5 mod
 els show either a cessation or slowdown of these events under climate chan
 ge due to open ocean surface freshening. Furthermore\, we find that CMIP5 
 models cannot accurately capture the shelf Antarctic Slope Current and Ant
 arctic Slope Front\, which when resolved in CM2.6\, constrains freshening 
 driven by sea ice melt and enhanced runoff to remain on the shelf region. 
 Open ocean stratification is then enhanced by freshening in CMIP5 models\,
  resulting in a slowdown of these WSP events. These results point to the n
 eed to improve simulations of shelf ocean circulation used in climate chan
 ge projections.\n\nWednesday Mar 11/ 2.30 PM/ Room 934 Burnside Hall\n\n 
 \n
DTSTART:20200311T183000Z
DTEND:20200311T193000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:On the role of the Antarctic Slope Front on the occurrence of the W
 eddell Sea polynya under climate change
URL:/meteo/channels/event/role-antarctic-slope-front-o
 ccurrence-weddell-sea-polynya-under-climate-change-320710
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