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8.2 kyr: Model + Data -> North American Meltwater Discharge

Explore the North American glacial meltwater discharge impact on climate during the late deglacial stage. Investigate the role of outburst floods and sustained discharge over time. Utilize the Glacial Systems Model with Bayesian calibration against paleo proxies.

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8.2 kyr: Model + Data -> North American Meltwater Discharge

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  1. 8.2 kyr: Model + Data -> North American Meltwater Discharge Lev Tarasov and W. R. Peltier University of Toronto

  2. Glacial Systems Model (GSM) • Margin forcing (Dyke, 2003) • Large ensemble approach • Bayesian calibration of 22 model parameters against a large set of paleo proxies

  3. Drainage topography • Fast down-slope/storage surface drainage solver: dt=100 years • Coarse grained topography derived from HYDRO-1K DEM

  4. Deglacial drainage impact on climate?

  5. Deglacial drainage impact on climate?

  6. Deglacial drainage impact on climate?

  7. Pre-collapse sequence

  8. Pre-collapse sequence

  9. Collapse

  10. Summary Atlantic and Arctic discharge “appear to have little impact” during late deglacial stage Does -8.2 kyr event result just from outburst flood or from large sustained discharge over more than 200 years? Especially given “phase delay between outburst flood and inferred climate event”

  11. Agassiz lake volume chronology

  12. Calibration data

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