Mesoscale vortices, ageostrophic motions and vertical mixing in the ocean
Bibliographic record
Abstract
We investigate the role played by wind-forced eddies in the vertical transport and mixing at the ocean mesoscale with a high-resolution primitive-equation model. Both idealized and realistic configurations are implemented. With a detailed analysis of the vertical velocity field in the idealized experiments we find that in the vortex cores and inside intense vorticity filaments, the motion is strongly ageostrophic, and vertical velocities associated with the vortices can reach magnitudes and levels of spatial complexity akin to those reported for frontal regions. Mesoscale anticyclones appear as ”islands” of increased penetration of wind energy into the ocean interior, and they represent the maxima of available potential energy. The wind energy injected at the surface is transferred at depth through the generation and subsequent straining effect of Vortex Rossby Waves (VRWs), whose time-scale is of the order of few days, and through near-inertial internal oscillations trapped inside anticyclonic vortices, on time scales of few hours to few days depending on the latitude. In the realistic configurations (Labrador Sea and South China Sea), we show that the temporal resolution of the wind forcing contributes to the strength of the near-inertial component. We evaluate the response of the ocean circulation in the under three different forcing conditions: NCEP/QUICKSCATT blended monthly, daily and six-hourly mean winds. While the surface circulation does not display significant differences, the vertical velocity field shows high sensitivity to the frequency of the wind forcing. We analyze the physical mechanism responsible for those changes and the details of the interplay between the near-inertial and mesoscale eddy fields under the various forcing fields, quantifying the impact of those changes on the vertical mixing.
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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 | 0.000 |
| 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) | 0.000 | 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".