Methane Emissions and Dynamics in the Weddell and Scotia Seas
Bibliographic record
Abstract
Abstract The Southern Ocean's role in the global methane () cycle remains uncertain due to limited measurement data from this remote region. It is unclear if the Southern Ocean acts as a source or sink of atmospheric , and climatic changes can have consequences on the amount of marine released due to the acceleration of glacial melting and uncertain consequences on seabed reservoirs. Monitoring here is essential to understanding its impact on the global budget now and in the future. This study measured concentrations in both ocean and atmosphere during an expedition in the Scotia Sea, Weddell Sea, and South Georgia shelf, linking seabed activity, water column concentrations, sea‐air fluxes, and atmospheric levels. All areas were found to be a small source of to the atmosphere. Surface water concentrations of off‐shelf waters were found to be lower south of the Southern Antarctic Circumpolar Current front, where upwelling brings ‐depleted waters to the surface. On‐shelf regions show higher emissions compared to off‐shelf, with average sea‐air fluxes of 0.269 0.035 μmol m −2 d −1 and 0.136 0.021 μmol m −2 d −1 , respectively, likely due to seabed seepage and methane‐enriched freshwater. This study finds that the Weddell and Scotia seas (including the South Georgia shelf) are a small source of atmospheric . As this result contradicts previous studies identifying this area as a sink, continued monitoring is needed to understand how emissions are changing and may continue to change in the future.
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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 | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 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) | 0.001 | 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".