Space‐based constraints on the production of nitric oxide by lightning
Bibliographic record
Abstract
We interpret observations of trace‐gases from three satellite platforms to provide top‐down constraints on the production of NO by lightning. The space‐based observations are tropospheric NO 2 columns from SCIAMACHY, tropospheric O 3 columns from OMI and MLS, and upper tropospheric HNO 3 from ACE‐FTS. A global chemical transport model (GEOS‐Chem) is used to identify locations and time periods in which lightning would be expected to dominate the trace gas observations. The satellite observations are sampled at those locations and time periods. All three observations exhibit a maximum in the tropical Atlantic region and a minimum in the tropical Pacific. This wave‐1 pattern is driven by injection of lightning NO into the upper troposphere over the tropical continents, followed by photochemical production of NO 2 , HNO 3 , and O 3 during transport. Lightning produces a broad enhancement over the tropical Atlantic and Africa of 2–6 × 10 14 molecules NO 2 cm −2 , 4 × 10 17 molecules O 3 cm −2 (15 Dobson Units), and 125 pptv of upper tropospheric HNO 3 . The lightning background is 25–50% weaker over the tropical Pacific. A global source of 6 ± 2 Tg N yr −1 from lightning in the model best represents the satellite observations of tropospheric NO 2 , O 3 , and HNO 3 .
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 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".