Decay of first year sea ice: a second season of field measurements
Bibliographic record
Abstract
This report describes a second season of field measurements undertaken to characterize the seasonal ice decay of landfast first year sea ice. The project was conducted from 14 May to 28 June 2001. The depth of the snow cover and the thickness, temperature and salinity of the ice were measured on a near-daily basis during that time. The ice thickness between mid-May and early June ranged from 1.30 to 1.45 m. A borehole jack assembly was used to measure the in situ confined compressive strength (borehole strength) of the ice from 14 May to 11 June. More than one hundred borehole jack tests were conducted at ice depths 0.3, 0.6, 0.9 and 1.2 m. No significant ice ablation occurred during the time that the borehole jack tests were conducted. Strength measurements from the two, sequential years of testing indicated that the ice underwent four well-defined stages of strength reduction. Stage I extended from 14 May to 20 May during which the ice lost from 25 to 30% of its strength. Stage II occurred from 20 May to 3 June and was characterized by two weeks of stable ice strength measurements. Stage III occurred from 3 June to 2 July, during which the ice further lost 65 to 80% of its strength. The final stage, Stage IV, extended from early to late July (at which point measurements terminated). During Stage IV, strength throughout the full ice thickness reached a stable value of 2 to 3 MPa. Strength measurements showed that ice characterized by Stage IV had only 80 to 90% of its full winter strength.
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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 | 0.002 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".