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SUMMARY:Ocean boundary layer turbulence - Bethan Wynn’s-Cattanach\, Scri
 pps Institution of Oceanography
DTSTART:20240606T103000Z
DTEND:20240606T113000Z
UID:TALK215887@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:Observations of diapycnal upwelling and interior exchange alon
 g the ocean’s sloping bottom boundary: \n\nRecent theories suggest that 
 deep-ocean upwelling\, vital for maintaining the abyssal overturning circu
 lation\, is confined to a bottom boundary layer on the ocean's sloping sea
 floor. However\, direct evidence of near-boundary upwelling and the proces
 ses that cause it are lacking. This talk presents findings from a field ca
 mpaign conducted in a typical continental slope canyon\, which focused on 
 directly observing the turbulent processes within the near-boundary region
 . Using a passive dye release\, we observed rapid diapycnal upwelling at a
  rate approximately 10\,000 times higher than the global average needed to
  sustain the circulation. Long-term observations from moorings suggest tha
 t the upwelling was driven by the convective breaking of the internal tide
 . We also find that three-dimensional processes are crucial\, noting adiab
 atic exchange between the boundary region and the interior at tidal and lo
 nger timescales. This exchange re-stratifies the boundary\, making mixing 
 efficient and allowing for diapycnal upwelling. \n\nBio: \n\nBethan Wynne-
 Cattanach is a post-doctoral researcher at Scripps Institution of Oceanogr
 aphy in the Multiscale Ocean Dynamics group. She is currently visiting the
  University of Cambridge as a David Crighton Fellow. Her research focuses 
 on submesoscale and turbulent processes driven by flow-topography interact
 ions and how these lead to water mass transformation. She has been involve
 d in several observational field campaigns\, including looking at island w
 ake dynamics during the Flow Encountering Abrupt Topography (FLEAT) Experi
 ment and tidally-driven upwelling as part the Boundary Layer Turbulence an
 d Abyssal Recipes (BLT) Experiment. 
LOCATION:Open Plan Area\, Institute for Energy and Environmental Flows\, M
 adingley Rise CB3 0EZ
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