Emissions of methyl chloroform (CH3CCI3) from biomass burning and the tropospheric methyl chloroform budget
Bibliographic record
Abstract
The only known sources of atmospheric methyl chloroform are industrial production and biomass burning.With the phase-out of industrial methyl chloroform production the atmospheric burden of methyl chloroform is rapidly declining.Consequently the potential importance of nonindustrial sources is increasing.Up to now only one experimental investigation of methyl chloroform emissions from biomass burning has been published.Here laboratory studies of methyl chloroform emission from wood burning are presented.The emission ratios relative to carbon dioxide and carbon monoxide are 12.7 4-2.6 x 104 and 15.6 4-3.3 x 10 -7, respectively.Although based on a limited number of measurements, they strongly suggest that methyl chloroform emissions from biomass burning are at the lower end of previous estimates.The impact of these emissions on the chemistry of the atmosphere will be marginal.However, reliable knowledge of the biomass burning source strength will be essential for a detailed analysis of the trend of atmospheric methyl chloroform concentrations.* The definition of the buming stage is based on visual appearance.*The absolute calibration is based on an average value of 90 ppt for ambient northem hemispheric methyl chloroform mixing ratio in fall 1997, derived from the results published .byMontzka et al., 1999).Error and average of eight whole air samples.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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".