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Western Canadian Association of Geographers Western Division Meeting 2009
 

Western Canadian Association of Geographers Western Division Meeting 2009

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    Western Canadian Association of Geographers Western Division Meeting 2009 Western Canadian Association of Geographers Western Division Meeting 2009 Presentation Transcript

    • Dendrochronologic record for mid-late Holocene glacial activity in Manatee Valley, Upper Lillooet Provincial Park, southern Coast Mountains, BC Lindsey E. Koehler and Dan J. Smith University of Victoria Tree Ring Laboratory Department of Geography University of Victoria Victoria, BC
    • Outline
      • Introduction to the research context
      • Study Area
      • Methods
      • Results
      • Discussion
      • Suggestions for future research
    • Historical Context for Glaciological Research in the B.C. Coast Mountains
      • 1930’s
        • Early photographic records of glacier extents
      • 1940’s
        • Post-WWII aerial photography
      • 1950’s
        • Early applications of dendroglaciology to Little Ice Age moraines (Mathews, 1951; Brink, 1959)
      • 1960’s
        • Radiometric dating applied to dendroglaciologic samples
        • Beginning of glacier mass balance monitoring at Place Glacier
      • 1980’s
        • First detailed study of Holocene glacial activity (Ryder and Thomson, 1986)
      • 1990’s
        • Continued work in the Coast Mountains
      • 2000’s
          • Detailed glacial reconstructions for entire Holocene
          • Expanding network of glacial chronologies
    • Study Area
      • Geologic Setting
              • Coast Mountain Granitic Complex
              • Quaternary volcanics
              • Pleistocene glaciation
      • Biogeoclimatic Zones
              • ESSF
              • AT
    • Manatee Valley
    • Research Methods I
      • Dendroglaciology
        • Subfossil wood
          • Detrital
          • In-situ
        • First Colonizers
          • Moraine crests
          • Distal slopes
        • Living Trees
          • Lateral margins
          • Tree islands
    • Research Methods II
      • Lichenometry
        • Assumptions
          • Thalli expand at a constant rate
          • Largest thallus on surface is the first colonizer
          • Have surfaces of known age
        • Temporal Range
        • Uncertainties
          • Ecesis interval
          • Disturbance of the geomorphic surface
          • Microclimatic factors
          • Life history of lichen species
    • Results Overview
      • Mid-Holocene Glacial Events
        • 4270±60 14 C years BP
        • 3500±60 14 C years BP
        • 3430±60 14 C years BP
        • 2350±70 14 C years BP
      • 5-6 Little Ice Age moraine-building episodes
        • Late-14 th Century
        • Continuous record from 18 th -20 th centuries
    • Site 1 : Orca Glacier Snout
    • Site 2 : Manatee Glacier Lateral Margin
    • Site 3 : Orca/Beluga Glacier Forefield
    • Site 4 : Manatee Glacier Forefield
    • Site 5 : Orca/Beluga Lateral Moraine
    • Little Ice Age Moraines
    • Lichenometry at Manatee Valley
    • Lichenometric Dates for Moraine Stabilization
    • Moraine Dates vs. Tree-Ring-Widths
    • Discussion: Holocene Advances in Manatee Valley
      • Mid-Holocene
        • 4200 14 C years BP event
        • ‘ Early Tiedemann’ Advance
        • ‘ Late Tiedemann’ Advance
      • Little Ice Age
        • 1390’s
        • Mid-1550’s
        • Late-1600’s-early-1700’s
        • Early-1800’s
        • Late-1800’s
        • Early-1900’s
    • Suggestions for Future Research
      • Lichenometry
        • More control surfaces from the southern Coast Mountains
      • Dendroglaciology
        • Tree-ring chronology development
        • Continued collection of subfossil wood as ice front recede
        • Mass Balance reconstructions
    • Acknowledgements