Stability of the Mediterranean's thermohaline circulation under modified surface evaporative fluxes
Bibliographic record
Abstract
A series of experiments with an ocean general circulation model of the Mediterranean forced by artificial (but realistic) surface fluxes of heat and fresh water is performed over 100 year periods. The model has a stable thermohaline circulation under the baseline fluxes. Small increases/decreases in excess evaporation (±8%) produce a linear strengthening/weakening of this thermohaline circulation with more/less water formation and strait transports. The water properties do not change much, and the responce is consistent with submaximal exchange at Gibraltar, where changes in volume and freshwater transport can be achieved mainly by changing the interface level between inflowing and outflowing waters. Larger changes in excess evaporation lead to nonlinear responses for increasing and decreasing values that are quite different. Reducing evaporation (−20%) causes both western and eastern deep water formation to cease, leaving a shallower intermediate circulation only. Increasing evaporation (+25%) initially strengthens the overturning but also produces a hydraulic jump‐like feature at Gibraltar, which mixes inflowing and outflowing waters, decreasing the salt flux out of the basin. As a result, the basin salinity increases greatly over 140 years, until the overturning collapses and the Gibraltar mixing ceases, leaving a shallow intermediate circulation above highly saline and stagnant deep waters. The possible relevance of these experiments to recent changes in Mediterranean fluxes and water properties is discussed.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 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 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".