Evolution of paleohydrological pathways at Nettilling Lake, Baffin Island (Nunavut, Canada) since deglaciation
Bibliographic record
Abstract
Paleohydrological connections and pathways within Nettilling Lake, the largest lake in the Canadian Arctic Archipelago (Baffin Island, Canada), remain poorly known. This knowledge gap hinders our ability to reliably infer past environmental changes that could provide clues to the future evolution of this region with rapid environmental change at high latitudes. The lake is currently fed by freshwaters from its catchment and drains westward into the Foxe Basin via the Koukdjuaq River. However, its early hydrological connections following the last deglaciation are thought to have been complex, when marine waters from the postglacial Tyrell Sea initially invaded the Nettilling basin from the west, followed by a brief reversal when Atlantic waters fed the basin from the east via the Cumberland Sound and Nettilling Fjord. To test this hypothesis, we investigated the lithology, sedimentology and geochemistry of various sediment archives from the easternmost sector of the lake. The multi-proxy data revealed three successive phases: an initial glaciomarine phase (8300 - 7300 cal. BP), a brackish phase (7300 - 6000 cal. BP) and a lacustrine freshwater phase (6000 - present). Our results support the hypothesis formulated by Blake (1966) of temporary hydrological connectivity between the Foxe Basin in the west, followed by a link with the Atlantic Ocean in the east via the Cumberland Sound before marine waters retreated due to differential glacio-isostatic uplift that forced the basin to be progressively occupied by the fresh waters of the present-day Nettilling Lake.
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 | 0.000 | 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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".