<scp>CDOM</scp> spectral slope (<scp><i>S</i></scp><sub>275–295</sub>) as tracers of water masses, <scp>CDOM</scp> heterogeneity, and <scp>Δ<sup>14</sup>C‐DOC</scp> in an oligotrophic marginal sea
Bibliographic record
Abstract
Abstract The absorption spectral slope, S 275–295 , is an optical metric frequently employed for characterizing chromophoric dissolved organic matter (CDOM). We collected CDOM absorption ( a CDOM ) and fluorescence spectra from the oligotrophic offshore South China Sea to identify the major determinant of S 275–295 and to explore the potential of S 275–295 as physical and biogeochemical tracers. S 275–295 linearly decreased with increasing humic‐like fluorescent DOM, revealing the latter as the primary control on S 275–295 . The variability of S 275–295 consistently declined from the surface to deep water, making S 275–295 a potential indicator of CDOM molecular heterogeneity. The S 275–295 vs. a CDOM plot was found to be a useful tool for characterizing water masses. The 14 C content of dissolved organic carbon (Δ 14 C‐DOC) shows a strong correlation to S 275–295 , demonstrating S 275–295 to be a proxy of the 14 C‐age of DOM. A provisional equation, ln(−Δ 14 C‐DOC) = (−0.85 ± 0.06) × ln( S 275–295 ) + (8.78 ± 0.19), was proposed to estimate Δ 14 C‐DOC from S 275–295 for global oligotrophic oceans.
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How this classification was reachedexpand
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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 teacher head, 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".