Freshwater and oxygen transport across the Labrador shelf-break: insights from gliders
Bibliographic record
Abstract
Transport of freshwater from the Labrador Shelf into the interior Labrador Sea has the potential to influence deep convection by controlling the salinity of surface waters. To examine this transport, we deployed two deep underwater gliders that traversed the continental shelf-break multiple times between July 5 and August 22, 2014. The field campaign yielded a unique data set of temperature, salinity and oxygen across the shelf-break at unprecedented spatial resolution. Two mechanisms of cross-shelf transport were examined: Ekman transport and transport due to mesoscale eddies. Ekman transport is quantified using satellite wind stress, and eddy induced transport is scaled using thickness gradients of layers of uniform potential density. Results show that both the Ekman and eddy terms in the mass budget transport water from the shelf to the Labrador Sea during summer. The offshore transport of freshwater in this study region represents about 1% of the total freshwater flowing through Hudson and Davis Straits and likely represents a seasonal maximum. Oxygen transport convergence across the 500 m isobath is about 170% of a previous estimate of Net Community Production in the interior Labrador Sea, suggesting that the assumption of negligible lateral fluxes should be made with caution.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 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 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".