Spatial reorganization in the equatorial divergence in the Eastern Tropical Pacific during the last 150 kyr
Bibliographic record
Abstract
[1] High-resolution downcore records of bulk sediment nitrogen isotopes (δ15N) and organic carbon (Corg) contents from multiple Eastern Tropical Pacific sites show remarkable uniformity during the last glacial stage, whereas during the Holocene and the last interglacial period, they diverge significantly. The close covariation of δ15N records during glacial stages points toward regional changes in the background isotopic signal of the inorganic nitrate pool, likely caused by variations in the denitrification rates in the nearby suboxic zones. On the other hand, we attribute the divergence of the δ15N and Corg records during interglacial periods to a spatial reorganization in the equatorial divergence. We posit a southward displacement of the zone of strongest upwelling in the South Equatorial Current to explain the reduced productivity and higher nitrate consumption recorded at the equator during warmer intervals.
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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) | 0.000 | 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 | 0.000 |
| 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".