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SUMMARY:Heat and freshwater transport in the vicinity of the Antarctic she
 lf - Graeme MacGilchrist (University of St. Andrews)
DTSTART:20241016T130000Z
DTEND:20241016T140000Z
UID:TALK220762@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:*For any external attendees\, please email Birgit Rogalla (bir
 gal at bas.ac.uk) and Yohei Takano (yokano at bas.ac.uk)\, so we can help 
 arrange access to BAS.*\n\nThe continental shelf at the boundary of Antarc
 tica mediates interactions between the Antarctic ice sheet and the global 
 ocean. Considering its climatic implications\, the circulation on the shel
 f\, in the nearby deep ocean\, and exchange between the two\, remains unde
 r-constrained. In this seminar\, I will present results from two recent st
 udies that explored different aspects of this circulation\, with a particu
 lar focus on heat and freshwater transports\, their natural variability\, 
 and their response to forced change. In the first study\, I will explore t
 he interannual variability of heat transport toward the West Antarctic pen
 insula\, as represented in an observationally-constrained model. We show t
 hat this heat transport is mediated by the strength and extent of the Ross
  Gyre\, itself a function of local wind stress curl and sea ice cover. In 
 the second study\, I will elucidate the role of the Antarctic slope curren
 t in controlling the export of ice sheet-derived meltwater from the shelf 
 to the open ocean. I will show\, via the divergent solutions of two climat
 e models\, how this process impacts Antarctic Bottom Water formation and g
 lobal overturning. In presenting both studies\, I will highlight the open 
 questions they reveal\, and point to current work that seeks to address th
 em.
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/93328878449
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