400-Year\nRecord of Atmospheric Mercury from Tree-Rings\nin Northwestern Canada
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
Tree-rings\nare a promising high-resolution archive for gaseous\natmospheric mercury (composed primarily of Hg<sup>0</sup>) reconstruction,\nbut the influence of cambial age (ring number from pith) and tree-specific\ndifferences are uncertainties with potential implications for interpreting\ntree-ring Hg signals. We address these uncertainties and reconstruct\nthe last 400 years of Hg<sup>0</sup> change using a tree-ring Hg data\nset from 20 white spruce (<i>Picea glauca</i>) trees from\na pristine site in central Yukon. Cambial age has no significant influence\non tree-ring Hg concentration, but tree-specific differences in mean\nconcentration are prevalent and must be normalized to a common mean\nto accurately constrain long-term trends in the mean tree-ring Hg\nrecord. Our record shows stable, low Hg<sup>0</sup> concentrations\nprior to ∼1750 CE, a persistent rise from ∼1750–1950\n(increasing more rapidly post-1850), a pause from ∼1951–1975,\nand then a resumed increase to record-high levels at present. This\ngeneral pattern is reflected in other proxy-based Hg reconstructions\nworldwide. This study provides a novel long-term Hg<sup>0</sup> reconstruction\nin the Western subarctic from one of the most widely distributed boreal\ntree species in North America and, therefore this proxy may also hold\npotential for investigating broader spatial patterns in Hg<sup>0</sup> cycling across the subarctic and northern boreal forest.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.200 | 0.001 |
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 it