Sverdrup Balance and Three \nDimensional Variability of the \nMeridional Overturning \nCirculation
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Bibliographic record
Abstract
Abstract \nTwo numerical models are used to gain an understanding of the spatial \nstructure of Atlantic Meridional Overturning Circulation changes and the \ndynamical framework within which those changes occur. \nSverdrup balance is studied using the 16 year ECCO-GODAE state estimation. \nIt is shown to hold well in the interior subtropics when integrating \nto a mid-depth level and when considered at spatial scales larger than approximately \n5◦. Outside of the subtropics, in western boundary currents \nand at short spatial scales, significant departures occur mostly due to a \nfailure in the assumption that there is a level of no motion that can be \nintegrated to and partly due to the assumption of linear vorticity. Sverdrup \nbalance is reached when enough time is allowed for the ocean to adjust to \nforcing by the propagation of baroclinic Rossby waves. \nA climate change simulation of the HiGEM high resolution coupled climate \nmodel is used to investigate to what extent a 30% reduction in the \ndeep southward transport is balanced by a reduction in the northward flowing \nsurface western boundary transport, or an increase in the southward \nupper interior transport. It is found that a reduction in the southwards \ndeep transport is balanced solely by a weakening of the northward surface \nwestern boundary current. This is consistent with Sverdrup balance holding \nto a good approximation in the basin interior. \nOverturning calculations in depth space and density space are found to \ndiffer within the subpolar gyre of a 120 year Control simulation of HiGEM. \nDepth space overturning is found to depend strongly on the transports of \nthe Labrador current, which are strengthened by a spin-up of the horizontal \nsubpolar gyre. Density space overturning is found to be strongly \ndependent on the densities of the Labrador Current, which increase following \nLabrador Sea water mass transformation and strong flow through the \nDenmark Straits.
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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 | 0.001 |
| 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 it