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SUMMARY:Antarctic sea-ice control on glacial and modern deep-ocean circula
 tion and carbon storage - Alice Marzocchi\, NOC
DTSTART:20180627T100000Z
DTEND:20180627T110000Z
UID:TALK107152@talks.cam.ac.uk
CONTACT:Dr Emma Boland
DESCRIPTION:Palaeoceanographic reconstructions indicate that the distribut
 ion of global ocean water masses has undergone major rearrangements on gla
 cial-interglacial time scales. Different rates of Antarctic sea-ice format
 ion\, which plays a key role in shaping the abyssal overturning circulatio
 n today\, may have driven these past circulation changes. This mechanism i
 s investigated in preindustrial and Last Glacial Maximum (LGM\, ~20\,000 y
 ears ago) fully-coupled climate simulations\, which are compared to an ide
 alised ocean model. The coupled simulations show substantial inter-model d
 ifferences in their representation of glacial ocean circulation\, which is
  often at odds with the geological evidence. Such inconsistencies are attr
 ibuted to differing (and likely insufficient) Antarctic sea-ice formation\
 , where discrepancies are further amplified by short integration times. Th
 e idealised model reproduces circulation patterns that are broadly consist
 ent with LGM reconstructions. Here\, the effect of Antarctic sea-ice expan
 sion on the simulated glacial circulation and air-sea gas exchange also re
 sults in increased deep-ocean carbon storage. These physical changes alone
  can explain about half of the glacial-interglacial variations in atmosphe
 ric CO2 concentrations.
LOCATION:British Antarctic Survey\, Innovation Centre\, Seminar Room 1
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