Climatic Implications of the Mechanical Collapse of the Laurentide Ice Sheet
Bibliographic record
Abstract
Although it is well-established that the Laurentide Ice Sheet collapsed over Hudson Bay ca. 8500 C yrs bp, the role of climate in this event remains ambiguous. We use a finiteelement glaciological model to test the hypothesis that the ice sheet would have survived throughout the Holocene via mass-balance feedbacks if its marine-based core had not disintegrated mechanically. Experiments that incorporate a parameterization of the Weertman (1974) marine instability mechanism show a complete Laurentide deglaciation in good accord with geologic data. When the instability is suppressed, the ice sheet contracts from its late Wisconsin maximum, but then stabilizes over Hudson Bay where it remains for the duration of the Holocene. The latter simulation uses a mass-balance scheme based on NCEP2 Reanalysis data; thus, ice-sheet changes are driven by modern environmental conditions. Our results place emphasis on the role of glacio-isostatic feedbacks in glacial terminations. Moreover, the possibility that the Laurentide Ice Sheet could still exist over Canada raises important questions about what glacial cycles are.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".