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SUMMARY:New approaches to understanding marine climate-carbon cycle feedba
 cks - Dr. Tilla Roy\, LSCE/IPSL\, Paris
DTSTART:20121120T110000Z
DTEND:20121120T120000Z
UID:TALK41500@talks.cam.ac.uk
CONTACT:Dr Andrew Meijers
DESCRIPTION:The efficiency of atmospheric CO2 storage by both the terrestr
 ial biosphere and the ocean is expected to reduce in response to climate c
 hange. This would cause atmospheric CO2 to rise faster than expected from 
 anthropogenic CO2 emissions alone. Using an ensemble of Earth System model
 s\, we show that the impact of climate-change on global air-sea CO2 flux v
 aries both regionally and between the models. The Southern Ocean is one of
  the regions where the climate-carbon-cycle feedbacks can be largest and w
 here they differ most between the models. I will demonstrate that our unde
 rstanding of the processes driving the future evolution of the Southern Oc
 ean CO2 flux is greatly improved by tracking the air-sea CO2 flux over reg
 ions constrained by evolving outcropping water-mass boundaries\, rather th
 an by fixed geographical boundaries. We isolate two geochemically-driven c
 omponents—one due to rising atmospheric CO2 concentrations\, and one due
  to localised chemical saturation. And\, we isolate two climate-driven com
 ponents—one due to changes in the outcrop surface areas of the water mas
 ses\, and one due to the local impacts of climate-change. \n
LOCATION:British Antarctic Survey\, Room 307
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