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SUMMARY:Southern Ocean processes and circulation\, and impacts on carbon d
 rawdown - Jean-Baptiste Sallee\, British Antarctic Survey
DTSTART:20120119T161500Z
DTEND:20120119T173000Z
UID:TALK35228@talks.cam.ac.uk
CONTACT:Dr Alex Archibald
DESCRIPTION:The oceans slow the rate of climate change by absorbing about 
 25% of the annual CO2 emissions due to human activities. The Southern Ocea
 n makes a substantial contribution to this oceanic sink: more than\n40% of
  the global oceanic inventory of anthropogenic CO2 has entered the ocean s
 outh of 40◦S. The rate-limiting step in ocean sequestration of\nanthropo
 genic CO2 is the transfer of carbon across the base of the surface mixed l
 ayer into the ocean interior. However\, the physical mechanisms\nresponsib
 le for the subduction of anthropogenic CO2 are poorly known.\nHere we use 
 observations to show that the subduction occurs in specific\nlocations whe
 re wind-driven Ekman transport\, eddy fluxes and variations\nin mixed laye
 r depth along mean streamlines drive anthropogenic carbon\nacross the mixe
 d-layer base. The net subduction is 0.42 ± 0.2 Pg C\ny−1 between 35◦S
  and the marginal sea-ice zone. Both the magnitude\nand location of the in
 ferred transport are consistent with the observed\ninterior distribution o
 f anthropogenic carbon. These results highlight the\ndependence of ocean c
 arbon sequestration on physical properties likely\nto be sensitive to clim
 ate variability and change\, including mixed layer\ndepth\, ocean currents
 \, wind and eddies.\n
LOCATION:Pfizer  Lecture Theatre\,  Department of Chemistry
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