Tree-ring evidence of the elusive 1959 summer cold event in northwestern North America
Bibliographic record
Abstract
Tree-ring records in northwestern North America suggest that the year 1959 was anomalously cold relative to the last several centuries. Here, we investigate the spatial characteristics, specific timing, and magnitude of the 1959 cold event through analyzing a multiparameter tree-ring network, including two wood anatomical records, and climate reanalysis data. By assessing the sensitivity of tree-ring data to a climate extreme during the instrumental era, we can better understand the capacity of these records to capture historical climate extremes. Our results suggest that cool conditions prevailed across the region in the summer of 1959, but the most extreme cold was centered around northwestern Canada, where maximum latewood density and cell wall thickness anomalies were exceedingly low. Though the entire summer of 1959 was cool, a brief episode of record cold temperatures from late July through early August likely contributed greatly to the extreme tree-ring anomalies. Our findings highlight that climate extremes during critical periods of the growing season can leave a significant imprint on maximum latewood density and that high-resolution wood anatomical data can be particularly powerful for identifying and potentially reconstructing the timing, duration, and magnitude of historical and undocumented climate extremes.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".