Stable isotope development in ground ice along an alpine tundra slope in the Ogilvie Mountains, Yukon Territory
Bibliographic record
Abstract
Stable isotopic ratios of oxygen and hydrogen (δ18O and δD) from ground ice have been used to reconstruct paleoclimate temperatures spanning the Late Pleistocene and Holocene in subarctic and arctic regions. This is possible due to the strong relations between the isotopic composition of atmospheric moisture and air temperature. Pore and texture ice, common forms of ground ice in permafrost regions, have been used to qualitatively infer the timing of centennial- and millennial-scale climate fluctuations spanning the Holocene and late Pleistocene. However, these records can be difficult to interpret because their source waters may become isotopically altered by local hydrological and phase-change (water-ice) processes before undergoing long-term preservation into the underlying permafrost record. The manifestations and relative contributions of these “secondary” isotopic modifications, which occur within the active layer and underlying transition layer, are poorly understood. In this study, we investigate spatially-varying processes that drive isotopic development in pore and texture ice from a catena within the Southern Ogilvie Mountains, Yukon Territory. The objectives of this study are to (1) establish the history of local permafrost formation using geochemical and traditional cryostructure analyses; (2) examine the stable isotopic relations between the active layer, transition layer, and relict pore and texture ice; (3) assess the impacts of local processes on the stable isotope development of pore and texture ice; and (4) build upon existing evidence for 20th century warming captured by stable isotope records in pore and texture ice.
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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 | 0.000 |
| 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 | 0.000 | 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".