Timing, duration, and magnitude of peak annual water-levels during ice breakup in the Mackenzie Delta and the role of river discharge
Bibliographic record
Abstract
[2] North-flowing rivers of the pan-Arctic region have important effects on the Arctic Ocean, but their river-ocean interfaces, including some with vast deltas such as the Mackenzie, have complex hydrology and remain poorly understood. Analysis of 39 years (1973–2011) of water-levels and river discharge at the head of the Mackenzie Delta, 48 years (1964–2011) of water-levels in the mid-delta, and 28 years (1984–2011) of water-levels in the outer delta permitted evaluation of changes in the timing, duration, and magnitude of peak annual water-levels during river-ice breakup. The initiation date of freshet-discharge into the delta has not changed, but the duration from freshet initiation until peak water-levels in the central delta (i.e., duration of ice clearance) has shortened from 35 to 27 days since 1964. The height of annual water-level peaks in the outer delta at Reindeer Channel may have declined by ∼0.4 m from 1984 to 2010, but complicating factors may be influencing this result. Winter-discharge has increased by ∼21% from 1973 to 2011, but this amount is too small to cause a trend in total Mackenzie discharge. Breakup-discharge (i.e., occurring during ice clearance through the central delta) has not significantly changed. The lag time from freshet-discharge initiation into the delta until initial breakage of the river ice-sheet has declined by 6.6 days from 1974 to 2007 and is sufficient to account for the shortened period of river-ice clearance. Declining snow-pack depths during April suggest that river-ice may be melting earlier and more rapidly.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.002 | 0.000 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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".