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SUMMARY: Tracing Antarctic Bottom Water formation in the Adélie and Georg
 e V Land: A proxy calibration study. - Taryn Noble (Tasmania)
DTSTART:20160906T130000Z
DTEND:20160906T140000Z
UID:TALK67416@talks.cam.ac.uk
CONTACT:Andy Buckley
DESCRIPTION:Antarctic Bottom Water (AABW) is one of the most important wat
 er masses in the global ocean. These cold dense waters form the lower limb
  of global thermohaline circulation system and ventilate the abyssal ocean
 . Understanding the consequences of variable AABW formation during differe
 nt climate regimes requires the extraction of reliable proxy data from mar
 ine sediment archives. However\, sediments around the Antarctic margin are
  challenging to work with due to the nature of the sediment (diatom ooze\,
  glacial-eroded sediments) and range of depositional environments.  In thi
 s study\, we examine a suite of surface sediments and associated oceanogra
 phic data on the Adélie and George V Land (AGVL) shelf\, East Antarctic\,
  proximal to the Mertz polyna\, where high salinity shelf waters cascade d
 own the slope to form about a quarter of the global AABW. A series of diff
 erent chemical extractions were performed\, including the separation of di
 atoms from the bulk sediments\, to isolate the authigenic Nd isotopic sign
 ature of this AABW end-member. We also evaluate the use of redox sensitive
  metals to characterise bottom water ventilation. This calibration study w
 ill inform the study of marine sediment cores collected on the AGVL slope\
 , which will be used to test the role of ocean forcing on Antarctic ice sh
 elf instability. 
LOCATION: Harker 1\, Department of Earth Sciences\, Downing Street
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