A methane bubble curtain in meromictic Sakinaw Lake, British Columbia
Bibliographic record
Abstract
Hydroacoustic surveys in meromictic Sakinaw Lake found an approximate 20‐m‐wide dual‐column bubble curtain originating from a depth of 42–60 m all around the main basin at the interface between the chemocline and the sediments. With the exception of the small upper basin, Sakinaw Lake is oligotrophic and permanently salt stratified, with a 30‐m mixolimnion overlying an anoxic monimolimnion containing high concentrations of sodium chloride and dissolved sulfide. Nitrogen is the major factor limiting the lake's phytoplankton productivity. The mainly methane bubbles in the curtain have a fairly narrow range of sizes, with most of the bubbles (75%) having radii between 600 and 850 µm with a peak at 735 µm, which is close to a third of the size of bubbles reported for Kinneret Lake in Israel. We hypothesize that different bubble generation mechanisms cause this difference. A simple bubble evolution model that includes gas dissolution and buoyancy is in good agreement with the acoustically observed bubble characteristics and is used to infer bubble densities and gas flux rates. Few of the bubbles reach the surface with any methane left in them. The bubble flux of methane into the upper part of the lake is 3 mg m−2 yr−1. The dual‐column nature of the bubble plume and the extensive and persistent nature of the bubble curtain around the lake suggest that there may be unique physical and biological conditions in Sakinaw Lake affecting methane generation and bubble ebullition.
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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 | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 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".