Variations in the transport, distribution, and budget of <sup>210</sup>Pb in sediment over the estuarine and inner shelf areas of the East China Sea due to Changjiang catchment changes
Bibliographic record
Abstract
Abstract To investigate the impact of changes in the Changjiang catchment on the estuarine coast‐shelf sedimentary system, variations in the transport, distribution, and budget of 210Pb in the sediment of the Changjiang subaqueous delta (CSD) and the Zhejiang‐Fujian coastal mud belt (ZFCMB) system were analyzed before and after the impounding of the Three Gorges Dam (TGD). The results indicate that the 210Pbex activity in the surficial sediments of the CSD‐ZFCMB decreased significantly after 2003 and that the surficial and vertical distribution of the 210Pbex activity in the CSD changed substantially due to intensified sediment redistribution. The 210Pb contribution of the Changjiang catchment to the CSD‐ZFCMB is not negligible. Due to the trapping effect of the TGD, 76 ± 49% of the 210Pb supply from the Changjiang upstream areas was retained in the TGD, resulting in the 210Pb flux into the sea decreased substantially. Furthermore, our findings demonstrate that the cross‐shelf plume provides a major conduit for the transport of 210Pb over the East China Sea. The variation in the 210Pb budget in the sediment of the CSD‐ZFCMB also indicated that the influence of Changjiang catchment changes on the 210Pbex and supported 210Pb activities will become more significant in the future. In addition, the rate of 210Pb burial in the sediments of the ZFCMB decreased, whereas the retention index of 210Pb and the amount of 210Pb retained in the CSD increased significantly, suggesting that after 2003, the material transfer function of the CSD weakened.
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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 | 0.001 |
| Science and technology studies | 0.000 | 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) | 0.001 | 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".