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SUMMARY:Cryptotephrochronology in the North Atlantic Region: Linking North
  Atlantic Marine Sediments to the Greenland ice-cores - Dr Peter Abbott (U
 niversity of Swansea)
DTSTART:20141204T173000Z
DTEND:20141204T183000Z
UID:TALK55200@talks.cam.ac.uk
CONTACT:Julia Gottschalk
DESCRIPTION:Tephrochronology is a powerful technique that can be utilised 
 for the correlation and synchronisation of disparate palaeoclimatic record
 s from different depositional\nenvironments. Thus\, this technique has con
 siderable potential for addressing key questions relating to rapid climati
 c events that characterised the last glacial period. In particular\, our s
 earch for microscopic tephra layers or cryptotephras within the Greenland 
 ice-cores and marine cores from the North Atlantic Ocean has the potential
  to test the phase relationships between the atmospheric and oceanic respo
 nses to these high-magnitude and abrupt climatic events.\nTephrochronologi
 cal investigations are currently being undertaken on a network of marine c
 ores from a range of locations and depositional settings within the North 
 Atlantic as part of the ERC-funded project Tephra constraints on Rapid Cli
 mate Events (TRACE). Tephra horizons have been identified in the marine re
 cords through the successful use of cryptotephra extraction techniques mor
 e commonly applied to the study of terrestrial sequences. The two main cha
 llenges associated with cryptotephra work in the glacial North Atlantic ar
 e i) determining the dominant transportation processes and ii) assessing t
 he influence of secondary reworking processes and the integrity of the iso
 chrons. The potential influence of these processes is investigated by asse
 ssing shard size\, geochemical (major and trace element) heterogeneity and
  co-variance of IRD input for some cores. We are also applying the innovat
 ive techniques of micromorphology and X-ray tomography to the study of the
 se processes.\nEarly comparison of the tephrochronological record of cores
  within the network highlight a number of potential marine to ice linkages
  and the potential for these to allow an assessment of the relative timing
  of climatic changes between the ocean and atmosphere will be discussed.
LOCATION:Thirkill Room\, Clare College
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