Jahn et al. 153 Arctic freshwater export variability: A model study
Why this work is in the frame
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Bibliographic record
Abstract
We present an analysis of the variability of the Arctic freshwater (FW) export to the North Atlantic, using a simulation from the Community Climate System Model (CCSM), version 3, which includes passive tracers that track the movement of FW from the different FW sources in the Arctic. We find that in Fram Strait the FW export is mainly composed of Eurasian river runoff and FW of Pacific origin, whereas the FW export through the Canadian Arctic Archipelago (CAA) is mainly composed of Pacific FW and North American runoff. The FW export variability is found to be related to changes in the large-scale atmospheric forcing over the Arctic, and not to changes in the FW input. We show that the details of the export variability are different for the export through Fram Strait and the CAA, with a much larger influence of salinity changes in the Fram Strait outflow than in the CAA, where the FW export variability is dominated by velocity anomalies. This difference explains the higher correlation of the Arctic Oscillation (AO) index with the liquid FW export through the CAA than through Fram Strait. The export of FW from different sources also shows differences in the correlation with the AO index, with much larger correlations between the export of Pacific FW, Eurasian river runoff, and North American river runoff and the AO than for the total liquid FW export.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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) | 0.002 | 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 it