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SUMMARY:A journey through a sub-Antarctic island fjord from glacier retrea
 t to fisheries management - Jo Zanker (Northumbria University)
DTSTART:20240917T130000Z
DTEND:20240917T140000Z
UID:TALK220495@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) to arrange for ac
 cess to BAS*. \n\nClimate change is impacting high-latitude fjord circulat
 ion with consequences for the melting of marine-terminating glaciers and f
 or the transport of biological material essential for supporting local eco
 systems. Currently\, little is understood about oceanographic variability 
 in sub-Antarctic island fjords such as Cumberland Bay\, the largest fjord 
 on the island of South Georgia in the Southern Ocean. Cumberland Bay is sp
 lit into two arms\, West Bay and East Bay\, each with a large marine-termi
 nating glacier at the head. These glaciers have shown asymmetrical retreat
  rates over the past century\, and it is not yet understood why. With a co
 mbination of oceanographic data and the development of a new high-resoluti
 on hydrodynamic model we gain the first understanding of the drivers of te
 mporal and spatial oceanographic variability and elucidate the role of suc
 h variability in the rate of glacier retreat. We find the possible presenc
 e of a shallow inner sill\, and the occurrence of foehn winds to both be p
 otentially contributing to rapid glacier retreat. The model provides a too
 l for exploring oceanographic influences on larval retention for the ecolo
 gically and commercially important mackerel icefish. Using model flow fiel
 ds to drive an individual-based model parameterised for mackerel icefish l
 arvae spawned in Cumberland Bay\, we identify West Bay as a key retention 
 zone and highlight how larval retention is sensitive to the complex fjord 
 circulation patterns driven by winds\, freshwater and fjord-shelf exchange
 s. Physical processes linked to climate change are found to influence chan
 ces of successful retention\, which underpins their future ability to recr
 uit to adult stock.
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/92840831145
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