Topographic steering of a mid‐depth drifter in an eddy‐like circulation region south and east of the Hawaiian Ridge
Bibliographic record
Abstract
A Profiling Autonomous Lagrangian Current Explorer (PALACE float) deployed in June 1997 at a “parking depth” of 1250 m depth to the south of Hawaii drifted westward within the North Equatorial Current for about a year before stalling in a region of directionally variable, eddy‐like flow centered near 21°N, 168°W, within the intersection region of the Pacific Seamounts and Hawaiian Ridge. The float remained within the 5‐km‐deep, eddying regime for more than 3 years before ending communication in October 2001. During its year in the North Equatorial Current, the float traveled roughly 1400 km westward along ≈18°N latitude at a mean mid‐depth speed of 4.39 ± 2.19 cm s−1. Within the eddying region, mid‐depth currents remained relatively strong but directions became highly variable and the mean westward drift diminished to 0.05 ± 2.67 cm s−1. Close examination of the 15‐day trajectory data reveals that the float entered the eddying region after making an abrupt northward turn along the shallow (∼2000 m deep) eastern limb of the Pacific Seamounts. Similar depth‐related directional changes were frequently observed throughout the 3.4‐year drift within the eddying region, consistent with modification of the mid‐depth circulation by the underlying seafloor topography. On the basis of the density structure obtained along the float trajectory, only topographic features with scale lengths of roughly 50 km or more have a significant effect on the mid‐depth flow.
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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 | 0.000 | 0.000 |
| 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 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".