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UID:20250627T010812EDT-1877uPoBlj@132.216.98.100
DTSTAMP:20250627T050812Z
DESCRIPTION:Dr Bruno Tremblay\n\nMcGill\n\nTuesday\, December 3\, 2024\n\n1
 2:30 pm\n\nLocal PK-7605\, 7e étage\, 201 ave. du Président-Kennedy\n\nZoo
 m: https://uqam.zoom.us/j/83216327466?pwd=WnZJNldCaS8xL1M4VDdadUVENHQ1dz09
 \n\nProjections of sea ice conditions in Nunatsiavut (Labrador)\n\nRésumé 
 / abstract:\n\nOf all sub-regions of the Canadian Arctic\, the Labrador an
 d Baffin Bay display the largest negative trend in summer sea ice area\, r
 aising important questions regarding the length of the “usable-sea-ice sea
 son” for coastal communities of Nunatsiavut. In this work\, we focus on pr
 ojected changes in sea ice thickness and extent in the Labrador Sea and Ba
 ffin Bay\, and more specifically on changes in sea ice season length aroun
 d four coastal communities\, namely Nain\, Hopedale\, Postville and Rigole
 t using output diagnostics from the High-Resolution (0.1 ◦) Community Eart
 h System Model version 1.3 (CESM1.3-HR) for the period 1850-2100. Given th
 at CESM1.3-HR does not simulate landfast sea ice\, nor does it resolve the
  fjords along the Labrador coast in which the coastal communities are loca
 ted\, the sea ice season length is derived from surface air temperature da
 ta (resolved by the model) and a simple freezing degree day model\, valida
 ted using in-situ\, reanalysis and remote sensing data. Results for the Ba
 ffin Bay and Labrador Sea show a remarkably stable maximum march sea ice e
 xtent in the Labrador Sea followed by a rapid transition to winter ice-fre
 e conditions around 2060 at the same time the Arctic Ocean becomes seasona
 lly ice-free and thick multi-year ice is no longer advected southward thro
 ugh the Nares Strait and along the Labrador coast. This is in contrast wit
 h the lower resolution CESM2-LE showing a re-expansion of the maximum sea 
 ice extent starting in the middle of the 21st century followed by a sudden
  collapse at the end of the century due to a freshening of the Labrador Se
 a surface waters and shutdown of deep convection. These results show the i
 mportance of resolving small scale processes (i.e.\, the fresh coastal Baf
 fin and Labrador currents) for regional climate projection. Also of intere
 st is the gradual decline in the “usable-sea-ice” season and sporadic extr
 emely large inter-annual variation in sea ice season length in the mid 21s
 t century - a signal that is robust to model spatial resolution and presen
 ce or absence of deep convection in the Labrador Sea.\n
DTSTART:20241210T173000Z
DTEND:20241210T183000Z
SUMMARY:Geotop Seminar Series: Dr Bruno Tremblay
URL:/eps/channels/event/geotop-seminar-series-dr-bruno
 -tremblay-359389
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