Polychlorinated Naphthalenes in the Atmosphere
Bibliographic record
Abstract
Polychlorinated naphthalenes (PCNs) are a class of industrial chemicals that are receiving renewed interest due to their abundance in the atmosphere and dioxin-like toxicity. Several recent measurements of their atmospheric burdens show that ΣPCN is 60-150 pg m -3 at urban locations and lower at rural and remote sites. Typically, ΣPCN is 20-50% of ΣPCB (polychlorinated biphenyls) and the toxicity contribution (measured as TCDD toxic equivalents, TEQs) is of a similar magnitude. Air parcel back trajectories show that elevated PCN burdens at remote arctic locations can be attributed to air masses that stem from land-based sources in the U.K. and Europe. The long-range atmospheric transport of PCNs is largely governed by particle-gas partitioning. The particle-associated fraction of PCNs is described using a simple model that utilizes the octanol-air partition coefficient (K OA ).
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.009 | 0.012 |
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".