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SUMMARY:Rewriting the tale of deep-ocean upwelling - Alberto Naveira Garab
 ato\, University of Southampton
DTSTART:20230214T120000Z
DTEND:20230214T130000Z
UID:TALK176987@talks.cam.ac.uk
CONTACT:Oscar Branson
DESCRIPTION:Since the seminal work of Walter Munk in the 1960s ('Abyssal R
 ecipes')\, oceanographers have believed that the upwelling of cold\, abyss
 al waters that regulates the deep ocean's ability to sequester heat and ca
 rbon for decades to millennia is driven by centimetre-scale turbulent mixi
 ng associated with breaking internal waves in the ocean interior. Measurem
 ents of deep-ocean turbulence over the last >20 years\, however\, have con
 tested this scenario\, and instead suggest that mixing by breaking interna
 l waves drives *downwelling* of abyssal waters. Inspired by this conundrum
 \, recent theoretical investigations have developed an alternative view of
  the role of mixing in sustaining deep-ocean upwelling. In this new view\,
  upwelling is driven by highly localised turbulence within thin (typically
  tens of metres thick) layers near the seafloor\, known collectively as th
 e bottom boundary layer. In the BLT Recipes experiment\, we recently set o
 ut to test this new view\, and figure out how it works\, by obtaining the 
 first set of concurrent\, systematic measurements of (1) large-scale mixin
 g and upwelling\, (2) their interior and bottom boundary layer contributio
 ns\, and (3) the processes underpinning these contributions\, in a represe
 ntative deep-ocean basin (the Rockall Trough\, in the Northeast Atlantic).
  This talk will review the insights emerging from the BLT Recipes experime
 nt\, and offer an outlook on how they might re-shape our understanding of 
 the way in which turbulence sustains deep-ocean upwelling.
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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