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SUMMARY:Tracing tephra horizons in the Greenland ice-cores and the potenti
 al for integrating disparate proxy records in the North Atlantic region - 
 Siwan Davies\, University of Swansea
DTSTART:20111122T163000Z
DTEND:20111122T173000Z
UID:TALK32749@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:Although the millennial-scale climatic events that characteris
 e the last glacial period are well-documented in a large number of dispara
 te proxy records\, the causal mechanisms remain poorly understood. Large d
 ating uncertainties associated with conventional approaches severely limit
  the integration of these records to test the degree of climatic synchrone
 ity in relation to these short-lived oscillations. One technique that has 
 considerable potential for the synchronisation of different records is tep
 hrochronology. Tephra isochrones displaying distinct geochemical fingerpri
 nts and deposited instantaneously following an eruption have the unique ad
 vantage of representing fixed time-lines between different proxy records. 
 Here we report on the ongoing work to trace tephra horizons in the Greenla
 nd ice-cores that have the potential to enhance the synchronisation of rec
 ords spanning the last glacial period. Several of the tephras identified c
 oincide with rapid climatic jumps imprinted in the Greenland ice-cores and
  thus\, represent independent constraints that hold considerable promise f
 or assessing lead/lag responses between the Earth’s climatic components.
  Major and trace element signatures are used to characterise these horizon
 s and independent ice-core age estimates are presented which can be incorp
 orated into building chronological models for other palaeoarchives in whic
 h common tephra horizons can be identified. This work falls within the obj
 ectives of the SMART (Synchronising MArine and Ice-core Records using Teph
 rochronology) and the TRACE (Tephra constraints on RApid Cimatic Events) p
 rojects.
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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