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UID:20260921T222727EDT-1136UuNrpK@132.216.98.100
DTSTAMP:20260922T022727Z
DESCRIPTION:Please join us as we welcome Dr. Satoshi Kimura\, a  numerical 
 modeler from from the British Antarctic Survey for his seminar titled 'Est
 imation of ice shelf melt rate in the presence of a thermohaline staircase
 '. Refreshments will be served.\n\nAbstract\n\nIce shelves are floating ex
 tensions of ice sheets that form along the coastal margins where the ice s
 heets are not thick enough to maintain contact with a bed. Thinning of ice
  shelves reduces the basal and lateral drags of outlet glaciers\, cause an
  acceleration of the seaward flow of the ice sheets upstream and change th
 e ice sheet’s contribution to the sea-level rise. Oceanic conditions benea
 th the ice shelves are isolated from the atmospheric forcing by ice (typic
 ally between 100 and 2000 m thick)\, and the major forcing is the phase ch
 ange at the ice-shelf base. We observed thermohaline staircases directly b
 eneath George VI Ice Shelf\, Antarctica. A thermohaline staircase is one o
 f the most pronounced manifestations of double-diffusive convection. Cooli
 ng and freshening of the ocean by melting ice produces cool\, freshwater a
 bove the warmer\, saltier water\, the water mass distribution favourable t
 o a type of double-diffusive convection known as diffusive convection. Whi
 le the vertical distribution of water masses can be susceptible to diffusi
 ve convection\, none of the observations beneath ice shelves so far have s
 hown signals of this process and its effect on melting ice shelves is unce
 rtain. The melt rate of ice shelves is commonly estimated using a paramete
 rization based on a three-equation model\, which assumes a fully developed
 \, unstratified turbulent flow over hydraulically smooth surfaces. These p
 rerequisites are clearly not met in the presence of a thermohaline stairca
 se.  I will discuss an approach to estimate the basal melt rate by applyin
 g an existing heat flux parameterization for diffusive convection in conju
 nction with the measurements of oceanic conditions at one site beneath Geo
 rge VI Ice Shelf.\n
DTSTART:20160225T203000Z
DTEND:20160225T213000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Seminar: Dr. Satoshi Kimura
URL:https://www.mcgill.ca/meteo/channels/event/seminar-dr-satoshi-kimura-25
 9234
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