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SUMMARY:Antarctic climate variability during past Interglacials: new findi
 ngs from the EPICA Dome C ice core. - Dr. Katy Pol\, British Antarctic Sur
 vey
DTSTART:20120417T143000Z
DTEND:20120417T153000Z
UID:TALK36461@talks.cam.ac.uk
CONTACT:Dr. Ailsa Benton
DESCRIPTION:Past Interglacials – in opposition to glacial periods - are 
 associated to global warm climatic conditions that can be compared to the 
 ones of the current interglacial period: the Holocene. Free from any anthr
 opogenic interference\, they are expected to bring useful information abou
 t natural climate variability during warm periods and help at the same tim
 e to better understand our present climate evolution.\n\nThe EPICA Dome C 
 (EDC) ice core\, by providing multi-proxy records of climate variations ov
 er the last 800 000 years (800 kyr)\, has documented in details the orbita
 l-scale variability of 9 interglacial periods\, from the Holocene or MIS (
 Marine Isotopic Stage) 1 to the late MIS 19. If their shape\, intensity an
 d duration have been more precisely characterized\, the high frequency var
 iability during interglacial periods remains poorly explored\, because of 
 a lack of sufficient temporal resolution. Based on new high resolution iso
 topic measurements conducted on the EDC core\, we here highlight new featu
 res of climate variability during interglacial periods at millennial to su
 b-millennial scale.\n \nBecause of climatic features of interest for a com
 parison with the Holocene\, we specifically focus on MIS 19\, 11 and 5. De
 spite a temporal resolution improved by a factor of 5\, our results do not
  reveal any added climatic information during MIS 19. The impact of an enh
 anced isotopic diffusion at the bottom part of the EDC core is here eviden
 ced. Albeit frustratring\, these results are of prime importance for futur
 e projects\, which aim to find the best Antarctic site to go further than 
 1 million years ago. The added value of measuring high resolution EDC samp
 les for characterizing sub-millennial climate variability during past inte
 rglacials is then confirmed regarding MIS 11 and 5 results. The newly reve
 aled climatic information is characterized in terms of (i) level of variab
 ility and (ii) distribution of changes over the course of the two intergla
 cials. Our results lead us to analyze the links between long-term trends a
 nd high frequency variability and compare our findings with the Holocene f
 eatures.
LOCATION:room 307\, British Antarctic Survey\, High Cross\, Cambridge\, CB
 3 0ET
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