BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Diagnosing diapycnal mixing in Drake Passage using numerical model
 s and results from the DIMES experiment - Neill Mackay\, National Oceanogr
 aphy Centre Liverpool
DTSTART:20140806T130000Z
DTEND:20140806T140000Z
UID:TALK53333@talks.cam.ac.uk
CONTACT:Dr Alexander Brearley
DESCRIPTION:Diapycnal mixing is a process central to the closure of the gl
 obal overturning circulation\, allowing dense waters created at high latit
 udes to return to mid-depths in the ocean. One of the aims of the Diapycna
 l and Isopycnal Mixing Experiment in the Southern Ocean (DIMES) is to inve
 stigate the magnitude and distribution of diapycnal mixing in and around D
 rake Passage\, a region of the Southern Ocean where intense rates of mixin
 g have been observed. In this presentation I will give an account of the w
 ork I carried out during my PhD\, which contributes to the aims of the DIM
 ES project.\n\nI will describe a number of efforts to model the evolution 
 of a tracer in the ACC\, beginning in the Southeast Pacific and progressin
 g through Drake Passage\, and compare the model outputs with results from 
 the DIMES tracer release experiment. I will show results from a simple 2D 
 model\, and a more complex 3D model which makes use of offline MITgcm comb
 ined with velocity fields derived from satellite altimetry. Diagnosed diap
 ycnal diffusivities will be reported\, and comparisons which were made usi
 ng the 3D model between diapycnal mixing rates derived from microstructure
  measurements\, from linear lee wave theory\, and from the tracer observat
 ions will be shown.
LOCATION:British Antarctic Survey\, Room 307
END:VEVENT
END:VCALENDAR