Temperature-based Diagnosis of the Gulf Stream Path Overestimates a Northward Shift in a Warming Ocean
Bibliographic record
Abstract
Changes in the Gulf Stream path are often seen as climate change indicators, with recent shifts driving rapid ecosystem alterations in the northwest Atlantic Ocean. Identifying the velocity axis of the Gulf Stream east of 70{degree sign}W is challenging due to meandering and eddy activity. This study uses high-resolution climate models to show that temperature-based criteria, especially the North Wall criterion, overestimate the northward shift of the Gulf Stream under high-emission scenarios by a factor of two to three. In contrast, a sea surface height (SSH)-based criterion remains more closely aligned with the true path, making it a more reliable tool for path estimations. Our analysis of velocity and temperature isotherms suggests rising seawater temperatures hinder accurate estimates of the Gulf Stream via temperature criteria alone. While temperature-based proxies are used in paleoclimate studies, our findings caution against their use for inferring changes in the Gulf Stream and AMOC.
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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 | 0.001 | 0.005 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| 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".