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SUMMARY:Spatial and Temporal Patterns of Southern Ocean Ventilation - Andr
 ew Styles\, British Antarctic Survey
DTSTART:20240320T140000Z
DTEND:20240320T150000Z
UID:TALK212392@talks.cam.ac.uk
CONTACT:Dr Birgit Rogalla
DESCRIPTION:Only a small fraction of the ocean is interacting with the atm
 osphere at any given time. This water is definitively found in the upper m
 ixing layer of the ocean. When this water leaves the mixing layer and ente
 rs the ocean interior\, it has ‘ventilated’ (this term arising from th
 e abundance of oxygen in newly ventilated water). The Southern Ocean is an
  important ventilation site for heat and carbon and is likely to influence
  the outcome of anthropogenic climate change. We conduct an extensive back
 wards-in-time trajectory experiment (effectively calculating a 30 year ‘
 history’ of the Southern Ocean) to identify spatial and temporal pattern
 s of ventilation. Temporally\, almost all ventilation occurs between Augus
 t and November. Spatially\, ‘hotspots’ of ventilation account for 60% 
 of open-ocean ventilation on a 30-year timescale\; the remaining 40% venti
 lates in a circumpolar pattern. The densest waters ventilate on the Antarc
 tic shelf\, primarily near the Antarctic Peninsula (40%) and the west Ross
  Sea (20%)\; the remaining 40% is distributed across East Antarctica. Shel
 f-ventilated waters also appear to experience significant densification ou
 tside of the mixed layer.
LOCATION:BAS Seminar Room 1\; zoom
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