Luminescence dating results from the 2023 ASIG sediment core, Prudhoe Dome, Greenland
Bibliographic record
Abstract
We drilled through 509 m of firn and ice at Prudhoe Dome , northwest Greenland to obtain sub-ice material yielding direct evidence for the response of the northwestern Greenland Ice Sheet to Holocene warmth. We collected ~3 m of sediment above ~4.4 m of bedrock between 6-6-2023 and 6-7-2023 using the ASIG drill operated by the United States National Science Foundation Ice Drilling Program. We measured luminescence signals from K-feldspars (150-200 micron fraction) at select depths within the sediment column at the University of Texas at Arlington Luminescence Laboratory using single-grain post-infrared infrared stimulated luminescence measured at 225℃ (p-IR IRSL225) measured on a Risø DA-20 luminescence reader. Our dataset contains estimates of equivalent dose (De) from a Minimum Age-3 Model (MAM-3) assuming a 15% overdispersion, the necessary DRAC (Dose Rate Age Calculator; Durcan et al., 2015) input information to calculate dose rates, and our calculated ages. We sent aliquots (1-10 g) of material from four depth intervals, 0-7.5 cm, 8.0–11.2 cm, 81.5–88.0 cm, and 173.3–177.8 cm, for XRF and ICP-MS measurements of radionuclides at SGS Canada (0-7.5 cm) or the Washington State University Peter Hooper GeoAnalytical Lab (8.0–11.2 cm, 81.5–88.0 cm, and 173.3–177.8 cm). We measured water content by measuring the mass of samples before melting and again after melting and after drying sediments in a 50 ℃ oven overnight. Our data record the last time sediments under Prudhoe Dome were exposed to sunlight, necessitating that Prudhoe Dome was absent from our site. Our luminescence data - including equivalent dose estimates and dose rate information - are included here. License: CC-BY: Creative Commons Attribution 4.0 International
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".