Thermal State of Permafrost (TSP) - a Canadian contribution to the International Permafrost Association's International Polar Year project
Bibliographic record
Abstract
Many new ground temperature measurement boreholes have been established, and data were collected at more than 100 monitoring sites. To examine change in the recent past, we are collecting records and assembling databases concerning permafrost sites which had been examined by industrial and government partners during the past two decades. An indication of recent permafrost change was the loss of permafrost at half of the sites that we examined in August 2007 and 2008 along the Alaska Highway east of Whitehorse compared to conditions recorded by one of Canada's first permafrost scientists in 1964. Another finding is that permafrost in the mountains of the Yukon is warmer than we expected based on projections from standard climate stations, all of which are located in the valleys. In the cold, continuous permafrost at Herschel Island in northern Yukon, the ground has warmed by over 3°C in the 20th century, in close response to the warming of climate since 1899-1905. In the Mackenzie delta area, the mean annual ground temperature has increased by about 1.5°C since 1970 at sites in tundra regions, and less in the delta itself. In the delta, the influence of numerous water bodies reduces the impact of climate warming in winter on ground temperatures, as these lakes and channels do not all freeze through. In the uplands near Inuvik, ground temperatures are now sufficiently warm that changes to surface conditions may lead to permafrost degradation.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.003 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.006 | 0.011 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.004 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".