Dendroclimatic reconstruction of precipitation for sites in the southern Canadian Rockies
Bibliographic record
Abstract
Seven Douglas fir ( Pseudotsuga menziesii) tree-ring chronologies were developed from sites in Banff and Jasper National Parks, Alberta, and near Cranbrook, British Columbia. The chronologies ranged in length from 191 to 691 years and display a strong precipitation signal. Multiple regression models were developed that calibrate .50% of the variance in the instrumental records and were used to reconstruct annual (pAugust– July or pJuly–June) precipitation for Banff, Jasper and Cranbrook. Comparison of these reconstructions with records from adjacent areas indicates that periods of reduced precipitation occurred over this region in c. ad 1760–1775, the 1790s, the 1840s–1870s, the 1890s and c. 1920–1945. Periods of significantly greater precipi-tation occurred during the 1880s–1920s and in the latter half of the twentieth century. The Banff reconstruction extends back to ad 1430 and also shows major drier intervals c. 1470–1510, the 1570s and 1615–1660. These reconstructions indicate regionally coherent precipitation patterns that fluctuate on decadal timescales and may be linked to changes in atmospheric circulation patterns.
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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 | 0.003 | 0.003 |
| 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".