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CATEGORIES:British Antarctic Survey - Polar Oceans seminar se
 ries
SUMMARY:Spatial and Temporal Patterns of Southern Ocean Ve
 ntilation - Andrew Styles\, British Antarctic Surv
 ey
DTSTART;TZID=Europe/London:20240320T140000
DTEND;TZID=Europe/London:20240320T150000
UID:TALK212392AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/212392
DESCRIPTION:Only a small fraction of the ocean is interacting 
 with the atmosphere at any given time. This water 
 is definitively found in the upper mixing layer of
  the ocean. When this water leaves the mixing laye
 r and enters the ocean interior\, it has ‘ventilat
 ed’ (this term arising from the abundance of oxyge
 n in newly ventilated water). The Southern Ocean i
 s an important ventilation site for heat and carbo
 n and is likely to influence the outcome of anthro
 pogenic climate change. We conduct an extensive ba
 ckwards-in-time trajectory experiment (effectively
  calculating a 30 year ‘history’ of the Southern O
 cean) to identify spatial and temporal patterns of
  ventilation. Temporally\, almost all ventilation 
 occurs between August and November. Spatially\, ‘h
 otspots’ of ventilation account for 60% of open-oc
 ean ventilation on a 30-year timescale\; the remai
 ning 40% ventilates in a circumpolar pattern. The 
 densest waters ventilate on the Antarctic shelf\, 
 primarily near the Antarctic Peninsula (40%) and t
 he west Ross Sea (20%)\; the remaining 40% is dist
 ributed across East Antarctica. Shelf-ventilated w
 aters also appear to experience significant densif
 ication outside of the mixed layer.
LOCATION:BAS Seminar Room 1\; zoom
CONTACT:Dr Birgit Rogalla
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