Variations and sources of the equivalent black carbon in the high Arctic revealed by long‐term observations at Alert and Barrow: 1989–2003
Bibliographic record
Abstract
Fifteen years of “equivalent” black carbon (EBC) measurements (derived from aethalometer measurements of light absorption) made at Alert in Nunavut, Canada, and Point Barrow in Alaska, United States, were compared for the long‐term trends and seasonal cycle. Over the 15‐year period from 1989 to 2003, the results revealed a downward trend in EBC concentrations by as much as 54% at Alert and 27% at Barrow for the all‐year data, by 49% at Alert and 33% at Barrow for the winter data, and by 53% at Alert for the summer. It was difficult to quantify if there was a decline during the summer for Barrow since there was no clear trend. The difference in trends might be related to changes in circulation in the Arctic, variable source contribution, and/or scavenging of particles. The results revealed that EBC concentrations were 40% higher during the positive phase of the North Atlantic Oscillation than during the negative phase. The source contributions at the two sites were determined by using trajectory analysis techniques, which revealed that Alert came under the influence of Siberia/Europe transport while Barrow showed influence from Siberian and Pacific/Asian transport.
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How this classification was reachedexpand
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 | 0.001 | 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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".