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SUMMARY:Wintertime Fjord-Shelf Interaction and Ice Sheet Melting in Southe
 ast Greenland - Neil Fraser\, SAMS
DTSTART:20180919T100000Z
DTEND:20180919T110000Z
UID:TALK109579@talks.cam.ac.uk
CONTACT:Caroline Holmes
DESCRIPTION:In southeast Greenland\, acceleration and retreat of the marin
 e-terminating glaciers contributes significantly towards global sea level 
 rise. Circulation in the fjords which accommodate these glaciers is though
 t to be driven both by freshwater input in summer and by barrier wind-driv
 en shelf exchange in winter. Due to a scarcity of data\, particularly from
  winter months\, the balance between these two mechanisms is not fully und
 erstood.\nA realistic numerical model was constructed with the aim of bett
 er understanding the interaction between Kangerdlugssuaq Fjord and the adj
 acent continental shelf\, and quantifying heat exchange during winter. The
  Earth’s rotation played a crucial role in the nature of the circulation
  and exchange in the fjord\, with inflow on the right (looking up-fjord) a
 nd outflow on the left. While the heat delivered into the fjord-mouth was 
 smaller than that observed in summer\, the background internal circulation
  was found to efficiently distribute waters through the fjord without exte
 rnal forcing\, and the heat delivered to the glacier terminus was comparab
 le to summer values. Barrier winds were found to excite coastally-trapped 
 internal waves which propagated into the fjord along the right-hand side. 
 The process was capable of doubling the heat delivery. The process also en
 hanced the background circulation\, via Stokes’ Drift\, and the overturn
 ing circulation\, via vertical mixing. Time series of glacial melt rate\, 
 as well as the heat flux through fjord cross-sections\, were constructed a
 nd compared to the variability in wind forcing. Long periods of moderate w
 ind stress were found to induce greatly enhanced heat flux towards the ice
  sheet\, while short\, strong gusts were found to have little influence\, 
 suggesting that the timescale over which the shelf wind field varies is a 
 key parameter in dictating wintertime heat delivery from the ocean to the 
 Greenland Ice Sheet.
LOCATION:British Antarctic Survey\, Seminar Room 330b
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