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SUMMARY:A close up on two aspects of LSW formation - Renske Gelderloos (Un
 iversity of Oxford)
DTSTART:20140319T110000Z
DTEND:20140319T120000Z
UID:TALK47344@talks.cam.ac.uk
CONTACT:Dr Dan Jones
DESCRIPTION:Under the harsh winter conditions of the north-western Atlanti
 c Ocean\, surface water in the Labrador Sea mixes with water from deeper l
 ayers to form a homogeneous water mass known as Labrador Sea Water (LSW). 
 The amount of LSW formed displays a large interannual variability with a d
 epth of convection ranging from only 200 m to over 2000 m depth. In order 
 to understand the driving mechanisms behind this variability\, we need to 
 understand how the ocean and atmosphere drive and limit convective mixing 
 in this region. I will zoom in onto two aspects that are important for con
 vective variability: (1) the roles that three different mesoscale eddies p
 lay in the restratification season after deep convection and (2) the way i
 n which the fresh surface layer inhibited deep convective mixing in the pa
 rticular case of the 1969-1971 period. The first item is studied using the
  MIT gcm model in a highly idealized regional configuration of the Labrado
 r Sea\, where we found a dominant role played by one particular eddy type.
  The second issue was studied using in situ data taken from an ocean weath
 er station in the central Labrador Sea. The analysis shows that the role p
 layed by fresh water in the surface is more complicated than commonly assu
 med\, with a feedback mechanisms which actively decreases the surface heat
  flux as long as deep convection is inhibited. 
LOCATION:British Antarctic Survey\, Room 307
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