Deepening of Winter Mixed Layer in the Canada Basin in Response to Pacific Summer Water Pathway Change
Bibliographic record
Abstract
Abstract The surface mixed layer plays a critical role in heat, carbon, and nutrient exchange within the atmosphere–ice–ocean system. Using the latest observations from the ice‐tethered profilers in the Canada Basin, we find the mixed layer became 9.6 m deeper and 0.7 psu saltier from 2006–2013 to 2014–2022. The mixed layer deepening coincides with the warming and freshening in the subsurface layer, thereby diminishing stratification beneath the mixed layer. The physical mechanisms of the mixed layer changes were investigated from two perspectives: the mixed layer local freshwater budget and remote control of Pacific inflow. Results indicate the saltier mixed layer maybe attributed to reduced freshwater inflow from the boundary driven by the southeastward contraction of the Beaufort Gyre. Lagrangian particle tracking experiments with GLORYS12 reanalysis reveal that subsurface layer salinity decreases, which can be explained by intensified entrainment of the fresh Pacific Summer Water (PSW) into the basin. It is driven by the local and remote effects: (a) Weakened northeasterly winds over Barrow Canyon facilitate PSW further approaching the southern edge of the basin, moving westward at deeper isobaths along the Chukchi slope and finally into the basin. (b) The southeastward contraction of the Beaufort Gyre drives more PSW from the Chukchi slope northeastward into the basin with the clockwise circulation. If the deepening of the mixed layer and the weakening of subsurface stratification persist, increased upward entrainment of heat and nutrients from the halocline may significantly accelerate ice melt and impact the local ecosystem.
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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 | 0.001 |
| Science and technology studies | 0.001 | 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".