An analysis of the dissolution of ice in Nares Strait using AVHRR Imagery
Bibliographic record
Abstract
Abstract The North Water Polynya is the largest polynya in the Canadian Arctic. Its northern boundary is defined by a blockage, or ice bridge, that spans Smith Sound. The maintenance of the ice bridge, and the polynya itself, is contingent upon the southward flow of ice from the Lincoln Sea through Nares Strait. This paper analyzes the dissolution of ice in Nares Strait using Advanced Very High Resolution Radiometer (AVHRR) data. From March to August 1998, 1440 images were downloaded by a satellite receiver at Canadian Forces Station (CFS) Alert on the northern tip of Ellesmere Island. A preliminary evaluation of the data included a visual assessment of over 300 cloud‐free images. Of most interest were 42 images that revealed a rapid dissolution of ice in Nares Strait during mid‐June. In a four‐day span the area of open water in Nares Strait increased from 400 km2 to 1200 km2. Subsequent analysis of selected scenes included the application of both a sea and ice surface temperature algorithm. Based on the satellite imagery and archived weather data from CFS Alert, the ice in Nares Strait initially began to weaken and break‐up due to in situ melting. The significant reconfiguration of ice observed during mid‐June was the result of high winds funnelling southward through the channel.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".