Collaborative Research: Laminated Lake Sediments from the Canadian High Arctic: Understanding the Climatic Signal for Paleoclimatic Reconstruction

Raymond S. Bradley    (Principal Investigator current)
                    
Abstract    

     Abstract  ATM-9322769  Bradley, Raymond S.  University of Massachusetts 
     Title: Laminated Lake Sediments from the Canadian High Arctic:  Understanding
     the Climatic Signal for Paleoclimatic Reconstruction    Synopsis.  Ice core and
     other paleoclimatic records from the High  Arctic suggest that summer
     temperatures reached minimum levels for  the entire Holocene during the last
     500 years, but underwent a  dramatic reversal in the last 100 years.  This
     award, under the  Paleoclimate from Arctic Lakes and Estuaries (PALE) program
     is  designed to study lake sediments from a number of sites to  determine if
     this hypothesis is supported by the sedimentary  record.    To better
     understand the paleoclimatic signal in the sediments, a  three year
     process-based study is planned to determine the primary  controls on sediments
     flux and varved sediment formation in Sophia  Lake, a High Arctic hypersaline,
     meromictic lake.  Sophia Lake  provides a simple topographic environment, which
     will facilitate  efforts to isolate the primary climatic forcing.  Sediments
     from  lakes on the margin of Agassiz Ice Cap will also be recovered in  order
     to link the paleoclimatic record of ice cores from the ice  cap to sedimentary
     records from the glacier margin,