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SUMMARY:High-latitude Southern Ocean carbon sink enhanced by seasonal sea-
 ice feedbacks during the Antarctic Cold Reversal - Chris Fogwill\, Keele U
 niversity
DTSTART:20180508T100000Z
DTEND:20180508T110000Z
UID:TALK103912@talks.cam.ac.uk
CONTACT:Dr Maria Vittoria Guarino
DESCRIPTION:The Southern Ocean plays a fundamental role in regulating glob
 al atmospheric CO2 levels\, yet the underlying processes and feedbacks tha
 t control the carbon cycle during climate transitions remain unclear. Foll
 owing the last glacial\, the rapid rise in atmospheric CO2 was interrupted
  by an enigmatic 1\,900-year plateau during a period of pronounced mid- to
  high-latitude Southern Hemisphere cooling called the Antarctic Cold Rever
 sal (ACR\, 14\,600-12\,700 years ago or 14.6-12.7 kyr BP). Here we report 
 the first biomarker and ancient DNA analysis of a highly-resolved Antarcti
 c ‘horizontal’ ice core\, which combined with marine sediment records 
 reveals a coherent signal of high-latitude Southern Ocean marine productiv
 ity and microbial diversity across the South Atlantic at the ACR. Transien
 t climate modelling shows this period coincided with the maximum seasonal 
 variability in sea-ice extent\, suggesting perhaps that sea-ice feedbacks 
 enhanced CO2 sequestration\, making the high-latitude Southern Ocean a sig
 nificant carbon sink that contributed to the sustained plateau in CO2 leve
 ls during the ACR.
LOCATION:British Antarctic Survey\, Seminar Room 307
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