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SUMMARY:The timing of cirque glaciation in western North America revisited
 : No Neoglacial in the U.S. Cordillera? - Shaun Marcott\, University of Wi
 sconsin-Madison
DTSTART:20170518T150000Z
DTEND:20170518T160000Z
UID:TALK71077@talks.cam.ac.uk
CONTACT:Dr Rachael Rhodes
DESCRIPTION:Glaciers are intrinsically linked to climate\, and given the s
 ensitivity of small alpine glaciers to climate change\, accurate and preci
 se chronologies of their fluctuations are important in elucidating both th
 e temporal and spatial structure of climate variability.  Despite nearly a
  century of research\, the timing of latest Pleistocene and Holocene alpin
 e glaciation in much of western North America remains poorly constrained. 
  I will present ~125 10Be ages from ~20 cirque moraines in 10 mountain ran
 ges across western North America that were previously interpreted as mid- 
 to late Holocene in age.  Our new 10Be glacial chronology indicates that t
 hese moraines were deposited during the latest Pleistocene to earliest Hol
 ocene\, requiring a refined interpretation of Holocene glacial activity in
  western North America and the associated climate forcing.  Although alpin
 e glaciers may have continued to fluctuate during the Holocene\, they neve
 r advanced beyond their Little Ice Age maximum limit.  Instead\, cirque gl
 acier activity in western North America has followed in near step with lat
 e Pleistocene high and mid latitude climate with alpine glaciers retreatin
 g to high altitude cirques early during the last deglaciation.
LOCATION:Castlereagh Room\, Fisher Building\, St John's College
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