Bibliographic record
Abstract
Tentative answers are provided to questions concerning the recent warming of permafrost in Alaska, particularly those regarding timing, duration, magnitude, spatial distribution, seasonality, active layer effects, thawing, thermokarst terrain, and causes. Permafrost warmed at most sites north of the Brooks Range from the Chukchi Sea to the Alaska‐Canada border, south along a transect from Prudhoe Bay to Gulkana and at sites up to 300 km from the transect. The warming was coincident with the statewide warming of air temperatures that began in 1976/1977 and appears to have occurred statewide with some exceptions. Magnitude of the warming was 3 to 4°C for the Arctic Coastal Plain, 1 to 2°C for the Brooks Range including its northern and southern foothills, and 0.3 to 1°C south of the Yukon River. This suggests a total warming of >6°C at Prudhoe Bay during the last century. The warming was seasonal (primarily in winter) with little change in summer conditions. Consequently, active layer thicknesses did not increase and were not correlated with warming permafrost conditions. Natural thawing at the permafrost surface (∼0.1 m/yr) occurred at both a tundra and forest site. Basal thawing at one site was ∼0.04 m/yr until 2000 when it accelerated to ∼0.09 m/yr. New thermokarst terrain has been observed in interior and northern Alaska. Probable causes of the warming include increased air temperatures, snow cover effects, and combinations of these. New investigations are needed to further determine the characteristics, especially the causes, of this recent permafrost warming.
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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 | 0.001 | 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".