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SUMMARY:GDGTs as a Temperature Proxy in Antarctic Lakes: Reconstructing Ho
 locene Climate in Yanou Lake\, King George Island - Louise Taylor\, Britis
 h Antarctic Survey
DTSTART:20141021T100000Z
DTEND:20141021T103000Z
UID:TALK53545@talks.cam.ac.uk
CONTACT:Dr. Ailsa Benton
DESCRIPTION:GDGTs (glycerol dialkyl glycerol tetraethers) are one of few e
 xisting quantitative temperature proxies. Although several studies have ap
 plied the TEX86 and MBT/CBT temperature indices\, developed for use in oce
 ans and soils respectively\, to lake sediments there are concerns over the
 ir validity in these environments. More recently\, research has led to the
  development of specific lake GDGT-temperature calibrations\, including a 
 global calibration using branched GDGTs (Pearson et al.\, 2011\; GCA. 75\,
  6225–6238). However\, this calibration potentially over estimates tempe
 ratures in ‘colder’ environments such as Antarctica suggesting more wo
 rk is needed to investigate the use of GDGTs in these environments and tha
 t an Antarctic regional calibration may be more appropriate. We have exami
 ned relationships between GDGTs and temperature in surface sediments from 
 Antarctic and sub-Antarctic lakes to create a new regional calibration. Ap
 plying this new Antarctic GDGT-temperature calibration to a sediment core 
 from Yanou Lake\, King George Island\, has allowed us to reconstruct past 
 temperature changes during the Mid-Late Holocene.
LOCATION:room 187\,  British Antarctic Survey\, High Cross\, Cambridge\, C
 B3 0ET
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