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SUMMARY:The Southern Ocean reveals its climate secrets: Paleotemperature i
 nsights from marine sediments - Dr. Amelia Shevenell\, University of South
  Florida
DTSTART:20140106T110000Z
DTEND:20140106T120000Z
UID:TALK49103@talks.cam.ac.uk
CONTACT:Dr. Ailsa Benton
DESCRIPTION:The disintegration of ice shelves\, reduced sea-ice and glacie
 r extent\, and shifting ecological zones observed around Antarctica highli
 ght the impact of recent atmospheric and oceanic warming on the cryosphere
 . Observations and models suggest that oceanic and atmospheric temperature
  variations at Antarctica’s margins affect global cryosphere stability\,
  ocean circulation\, sea levels and carbon cycling. In particular\, recent
  climate changes on the Antarctic Peninsula have been dramatic\, yet the H
 olocene climate variability of this region is largely unknown\, limiting o
 ur ability to evaluate ongoing changes within the context of historical va
 riability and underlying forcing mechanisms. \n\nHere we show that surface
  ocean temperatures at the continental margin of the western Antarctic Pen
 insula cooled by 3–4°C over the past 12\,000 years\, tracking the Holoc
 ene decline of local (65°S) spring insolation. Our results\, based on TEX
 86 sea surface temperature (SST) proxy evidence from a marine sediment cor
 e\, indicate the importance of regional summer duration as a driver of Ant
 arctic seasonal sea-ice fluctuations. On millennial timescales\, abrupt SS
 T fluctuations of 2–4°C coincide with globally recognized climate varia
 bility. \n\nSimilarities between our SSTs\, Southern Hemisphere westerly w
 ind reconstructions and El Niño/Southern Oscillation variability indicate
  that present climate teleconnections between the tropical Pacific Ocean a
 nd the western Antarctic Peninsula strengthened late in the Holocene epoch
 . We conclude that during the Holocene\,Southern Ocean temperatures at the
  western Antarctic Peninsula margin were tied to changes in the position o
 f the westerlies\, which have a critical role in global carbon cycling.
LOCATION:room 187\,  British Antarctic Survey\, High Cross\, Cambridge\, C
 B3 0ET
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