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