THE MANTRA 2002 BALLOON FLIGHT FROM VANSCOY, CANADA
Bibliographic record
Abstract
The MANTRA series of high-altitude balloon flights is being undertaken to investigate changes in the concentrations of mid-latitude stratospheric ozone, and of nitrogen and chlorine compounds that play a role in ozone chemistry. Three balloons have been launched since August 1998, all from Vanscoy, Saskatchewan. Each carried a payload of instruments to measure vertical concentration profiles of stratospheric trace gases, and made observations from a float altitude of about 35 km for one day. Several of these instruments were flown 15-20 years ago, thus providing a link to historical data predating the onset of mid-latitude ozone loss. The third of these balloons was launched on September 3, 2002, and measurements were made by 11 instruments. In addition, four ground-based spectrometers were deployed at Vanscoy approximately two weeks prior to this flight, and a total of 15 independent ozonesonde flights were made. This paper provides an overview of the MANTRA 2002 balloon campaign, and briefly describes each of the instruments, the data acquired, and the status of data analysis. We expect to retrieve vertical profiles of O3, NO, NO2, HNO3, N2O, OH, H2O, CH4, CO2, aerosol extinction, pressure and temperature from O2 (as well as from sondes), and total columns of O3, NO2, SO2, and possibly BrO. Data analysis is complete for some instruments and ongoing for others. These data will be used to contribute to the validation of the SCIAMACHY, MIPAS, and GOMOS instruments on ENVISAT through the Category 1 CAL/VAL project #1335.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.016 | 0.004 |
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".