DendrochronologicaI Studies of white spruce in the northern Yukon, Canada
Bibliographic record
Abstract
This thesis investigates the variation of ring widths from 23 white spruce (Picea glauca) treeline chronologies located along the Dempster Highway (61 -68°N), bracketing the position of the classical TTHH site (65.33°N) in the Yukon. Relationships between the 18 strongest chronologies and mean monthly/seasonal temperatures from Dawson over the 1900-2000 period were examined using correlation analyses. Ring-width chronologies were commonly negatively correlated with prior summer temperatures over the entire 20th century but most strongly in the 1950-2000 period. However, several sites had positive relationships with summer temperatures in the 1900-1950 period and much weaker or negative relationships with summer temperatures over the 1951-2000 period indicating an apparent “divergent” response over the 20th century. “Responder analysis” of three highly replicated sites indicated two were dominated by strong negative relationships with summer temperatures in the late 20th century but the northernmost site contained trees that maintained a positive relationship with summer temperatures in the late 20th century.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 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".