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SUMMARY:Assessing the impact of Holocene climate\, sea level\, and sea ice
  change on the Ardley Island penguin colony - Dr. Stephen Roberts\, Britis
 h Antarctic Survey
DTSTART:20141125T100000Z
DTEND:20141125T110000Z
UID:TALK55395@talks.cam.ac.uk
CONTACT:Dr. Ailsa Benton
DESCRIPTION:The western Antarctic Peninsula (WAP) is located in one of the
  fastest-warming regions on Earth\, and is a key area for studying the imp
 act of changing climate on glacier dynamics\, sea level and terrestrial an
 d marine ecosystems. As part of the IMCONET (www.imconet.eu) research prog
 ramme\, we are investigating relative sea level change and bio-geochemical
  sedimentation processes on Fildes Peninsula and Potter Peninsula\, South 
 Shetland Islands. Using lake sediment records from Fildes Peninsula\, and 
 recently collected lake and terrestrial samples from Potter Peninsula\, we
  have: (1) improved existing\, and produce new\, relative sea level curves
  for the South Shetland Islands\; (2) studied present and past bio-geochem
 ical characteristics of lacustrine and terrestrial sediments on Fildes and
  Potter Peninsulas\; (3) examined rates of deglaciation\, and deglaciation
 -related changes on Fildes and Potter Peninsula\, and the erosion of terre
 strial deposits into Potter Cove and Maxwell Bay\; (4) developed new lacus
 trine biomarker-based temperature proxies in an attempt to quantify past c
 hanges in temperature. This talk focuses on past lake ecosystem and pengui
 n population responses to Holocene deglaciation and climate/oceanographic-
 change across the WAP region. Juvenile gentoo penguin bones and elevated c
 oncentrations of a suite of inorganic trace elements commonly associated w
 ith penguin guano were found in lake sediments from Ardley Island during s
 ome\, but not all\, ‘warmer’ phases of the last c. 9\,000 years. I wil
 l discuss how changes in climate\, sea ice distribution and relative sea l
 evel\, as well as volcanic activity\, could have influenced long-term chan
 ges in the size and distribution of penguin colonies on Ardley Island and 
 across the WAP during the Holocene.
LOCATION:room 187\,  British Antarctic Survey\, High Cross\, Cambridge\, C
 B3 0ET
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