Understanding long-range transport mechanisms of perfluoroalkyl substances
Bibliographic record
Abstract
Perfluoroalkyl acids (PFAAs) are persistent, bioaccumulative compounds found \nubiquitously within the environment. They can be formed from the atmospheric oxidation \nof volatile precursor compounds and undergo long-range transport (LRT) through the \natmosphere and ocean to remote locations. Ice caps preserve a temporal record of PFAA \ndeposition making them useful in studying the atmospheric trends in LRT of PFAAs as \nwell as understanding major pollutant sources and production changes over time. \nA 15 m ice core representing 38 years of deposition (1977 – 2015) was collected \nfrom the Devon Ice Cap in Nunavut and analyzed for PFAAs. Samples were concentrated \nby solid phase extraction and analyzed by UPLC-MS/MS, IC, and ICP-OES. Both shortand \nlong-chain perfluorocarboxylic acids (PFCAs) and perfluorosulfonic acids (PFSAs) \nwere detected in the samples, with fluxes ranging from
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 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".