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SUMMARY:Mixing in oceanic (and laboratory) overflows - Claudia Cenedese\, 
 WHOI
DTSTART:20080925T104500Z
DTEND:20080925T114500Z
UID:TALK13774@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:This study proposes a new empirical parameterization for entra
 inment in dense currents that has been obtained using a data set which inc
 ludes oceanic and laboratory data. The proposed parameterization presents 
 two novelties when compared to the present available parameterizations. Fi
 rst\, it depends on both the Froude number\, Fr\, and Reynolds number\, Re
 \, of the flow and it accurately predicts both ocean and laboratory estima
 tes of mixing. Second\, it takes into account subcritical (Fr< 1) mixing. 
 The subcritical mixing observed in previous laboratory experiments could b
 e of fundamental importance when determining the final water mass characte
 ristics of a dense current descending the continental slope. A weak\, but 
 non zero entrainment can substantially change the final density and locati
 on in the open ocean water column of important water masses\, such as the 
 North Atlantic Deep Water. To test this new entrainment parameterization\,
  we used a “stream tube” model employing both the new and classical pa
 rameterizations. The stream tube model predictions are consistent with pre
 vious laboratory observations when the new entrainment parameterization is
  used. 
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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