Stability of climate signal in carbon and oxygen isotope records and ring width from Scots pine (<i>Pinus sylvestris</i> L.) in Finland
Bibliographic record
Abstract
Abstract Four hundred year long records of carbon and oxygen stable isotope ratios and ring width were measured from Scots pine ( Pinus sylvestris L.) from sites in Northern and Eastern Finland. Responses of isotope ratios to temperature and precipitation were analysed for the 20th century. Carbon isotope ratios responded strongly to summer temperature at both sites, whereas an influence of precipitation on the record was observed only at the site in Eastern Finland. Oxygen isotope ratios were less responsive to climatic variation than carbon at the high‐frequency level. To shed light on the role of the possible divergence problem during last decades the climate responses were studied separately in the first and in the second half of the 20th century. The responses to temperature were stable in the north but in Eastern Finland the significant period of summer occurred earlier during the later half of the century. Relationships between records were studied during the 400 a period. All proxies correlated positively with each other, although temporal changes occurred. Common forcing, discovered in Northern Finland between carbon isotope and ring width records, was weaker in the earlier period studied. Three climate reconstructions were created: temperature reconstruction for Northern Finland and temperature and precipitation reconstructions for Eastern Finland. Copyright © 2009 John Wiley & Sons, Ltd.
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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 | 0.001 |
| 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) | 0.000 | 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 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".