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SUMMARY:Exchanges between the Weddell Sea and the rest of the Southern Oce
 an - Loic Jullion\, NOCS
DTSTART:20121031T130000Z
DTEND:20121031T140000Z
UID:TALK40633@talks.cam.ac.uk
CONTACT:Dr Andrew Meijers
DESCRIPTION:Bottom water formation in the Southern Ocean plays an importan
 t role in the lower cell of the Meridional Overturning Circulation and in 
 marine biogeochemical cycling\, by ventilating and cooling the ocean abyss
  and sequestering carbon and nutrients there. The lack of adequate observa
 tions has to date hindered the quantification of exchanges of mass and phy
 sical and biogeochemical tracers between the Weddell gyre and the global o
 cean. The Antarctic Deep Water Rate of Export (ANDREX) project seeks to de
 termine these exchanges through analysis of the first systematic hydrograp
 hic and tracer survey along the gyre’s outer rim. These measurements (in
 cluding temperature\, salinity\, nutrients\, carbon system parameters\, ch
 lorofluorocarbons\, sulphur hexafluoride\, oxygen isotopes and noble gases
 ) are combined with velocity observations in an inverse model to obtain a 
 self-consistent estimate of the physical and biogeochemical transports acr
 oss the edge of the Weddell gyre and of the rate at which the deep ocean i
 s ventilated from the region. Of particular interest to the analysis are t
 he quantification of bottom water formation and the density profile of ven
 tilation in the gyre\, as well as an assessment of the region’s role in 
 biogeochemical cycling and anthropogenic carbon sequestration. In this pre
 sentation\, we will discuss the initial results of the box inverse model\,
  focusing on the physical circulation and bottom water formation rates in 
 the Weddell gyre.\n
LOCATION:British Antarctic Survey\, Room 187
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