Structure and Evolution of Temperature, Salinity, and Dissolved Oxygen in the Isolated Deep Waters of the Arctic's Canada Basin
Bibliographic record
Abstract
Abstract The bottom waters of the Arctic Ocean's Canada Basin are vertically homogeneous and have C isolation age of 450 years. Understanding the evolution of this geothermally heated isolated bottom water and the overlying water layer can provide insights into Arctic circulation patterns, including interactions between shallow and deep waters, as well as past climate conditions that may have resulted in their isolation. Observations of deep and bottom‐water potential temperature , salinity , and dissolved oxygen from the Beaufort Gyre Observing System/Joint Ocean Ice Study (BGOS/JOIS) program are analyzed in context with property conservation equations, geothermal heating, vertical diffusion, and biological consumption. We find an approximately linear warming trend of the bottom waters over 2003–2024, updating a previous study ending in 2010. We additionally find trends of decreasing salinity and dissolved oxygen over the record. The structure of the bottom water varies spatially, with thinner, warmer, and fresher bottom waters with lower observed near the boundaries. Bottom‐water properties are fluxed vertically into an overlying potential temperature minimum layer, with enhanced vertical fluxes of heat, salt, and dissolved oxygen in turbulent regions near the basin boundaries, and lower, likely molecular vertical fluxes in the basin interior. Heat is fluxed laterally in the layer from the boundaries to the interior, resulting in approximately spatially uniform rates of warming of the layer. Over 2005–2024, decreasing bottom‐water suggests an important influence of organic matter remineralization. The findings in this study are consistent with continued isolation of bottom waters.
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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 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".