Nonlinear Gulf Stream Interaction with Deep Currents: A Numerical Simulation
Bibliographic record
Abstract
A two-way-coupled duo grid primitive-equations-based ocean model is used in a 75-year simulation of the North Atlantic Ocean, Caribbean Sea and Gulf of Mexico region between 10 ◦ N and 73 ◦ N. All advection and horizontal pressure gradient terms are fourth-order accurate on a semi-Collocated control volume grid. By con-struction of surface freshwater and heat fluxes, the model multi-year ensemble mean annual cycle surface layer temperature and salinity converge to the climatological cycle. Hellerman annual cycle wind forcing is used. The duo grid resolutions are: 1/2 ◦ east of 60 ◦ W; 1/6 ◦ west of 60 ◦ W; 30 z-levels. Upwind-based fluxes across 60◦ W give nearly seamless grid coupling. Open boundary conditions derived from a one degree resolution global model are applied at 10 ◦ N. Model results show: total Gulf Stream (GS) separation at Cape Hatteras (CH) as observed, and a mean sep-arated GS path close to the observed mean path. The model Deep Current System (DCS: the shelf slope and deep western boundary current) strongly affects the GS separation and path. Only after ∼ 10 years of simulation, when the Labrador-Sea-modified dense DCS water arrives in the Grand Banks shelfbreak area, does the GS separation and path come into close agreement with observations. The wedge shaped region between the separated Gulf Stream and continental shelf slope is filled with eddies, including intense warm cores that pinch off the northern tips of Gulf Stream meanders. The isopycnal surfaces have a strikingly small slope in this region’s interior in both Yashayaev’s climatology (2002) and time mean model re-sults, indicating eddy dynamics characteristic of baroclinic instability rather than diffusive lateral mixing between the GS and DCS.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".