Ice shelf break‐up and ecosystem loss in the Canadian High Arctic
Bibliographic record
Abstract
Over the last 3 years, extensive fractures have appeared in the ∼3000‐yr‐old Ward Hunt Ice Shelf (83°N,75°W).The largest fracture, a north‐south‐oriented serpentine feature (Figure l), now forms an obvious dividing line between the west and east sides of the ice shelf. Secondary fractures extending westward from the central fracture have fragmented a large area of the ice shelf into free‐floating ice blocks. The fractures have severely weakened the ice shelf, although for the moment it remains pinned in place by a number of islands and ice rises. An immediate consequence of the fracturing was the catastrophic drainage of a fresh water lake that was dammed behind the ice shelf. This “epishelf” lake represented a rare ecosystem type in the northern hemisphere, which was particularly vulnerable to climate change. In a recent paper in Geophysical Research Letters [Mueller et al., 2003], a recent 30‐year period of accelerated warming, part of a longer 20th‐century warming trend, is implicated as a factor in the fracturing of the ice shelf and the drainage of the epishelf lake.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.005 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".