Underwater irradiance attenuation and photobleaching of chromophoric dissolved organic matter in shallow Arctic lakes of the Mackenzie Delta, NWT.
Bibliographic record
Abstract
In situ attenuation of ultraviolet-B (UVB; 310-320 nm subset), ultraviolet-A (UVA) and photosynthetically active radiation (PAR) generally declined over the 2004 open-water season in a set of shallow Mackenzie Delta floodplain lakes. Average 1% photic depths were < 30 cm for UVB and < 50 cm for UVA, indicating that part of the water column remained sunscreened from UV. Average euphotic and lake depths were approximately equal (~2 m), indicating sufficient PAR for photosynthesis at all depths. In 2005, dissolved organic matter (DOM) quality was examined using optical indices. Both spectral slope (decline in DOM absorbance as wavelength increases) and specific ultraviolet absorbance (average DOM aromaticity) were strongly correlated with sill elevation. UVA dominated in situ chromophoric DOM photobleaching, indicating that future increases in UVB fluxes are unlikely to exert as great an influence on in situ Mackenzie Delta optical environments as will increased chromophoric DOM from climate change.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| 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 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".