Ubiquitous atmospheric production of organic acids mediated by cloud droplets
Why is this work in the frame?
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Full frame distilled prediction
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.
- Candidate categories
- Insufficient payload (model declined to judge)
- Consensus categories
- none
- Domain
- Candidate signal: noneConsensus signal: none
- Study design
- Candidate signal: Bench or experimentalConsensus signal: Bench or experimental
- Genre
- Candidate signal: EmpiricalConsensus signal: Empirical
- Teacher disagreement score
- 0.162
- Threshold uncertainty score
- 0.996
- Validation status
machine_predicted_unvalidated·codex-gemma-dda1882f352a
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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.000 |
Machine scores (provisional)
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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.
- Teacher spread
- 0.189 · how far apart the two teachers sit on this one work
- Validation status
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
Abstract
Abstract Atmospheric acidity is increasingly determined by carbon dioxide and organic acids 1–3 . Among the latter, formic acid facilitates the nucleation of cloud droplets 4 and contributes to the acidity of clouds and rainwater 1,5 . At present, chemistry–climate models greatly underestimate the atmospheric burden of formic acid, because key processes related to its sources and sinks remain poorly understood 2,6–9 . Here we present atmospheric chamber experiments that show that formaldehyde is efficiently converted to gaseous formic acid via a multiphase pathway that involves its hydrated form, methanediol. In warm cloud droplets, methanediol undergoes fast outgassing but slow dehydration. Using a chemistry–climate model, we estimate that the gas-phase oxidation of methanediol produces up to four times more formic acid than all other known chemical sources combined. Our findings reconcile model predictions and measurements of formic acid abundance. The additional formic acid burden increases atmospheric acidity by reducing the pH of clouds and rainwater by up to 0.3. The diol mechanism presented here probably applies to other aldehydes and may help to explain the high atmospheric levels of other organic acids that affect aerosol growth and cloud evolution.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
The record
- Venue
- Nature
- Topic
- Atmospheric chemistry and aerosols
- Field
- Earth and Planetary Sciences
- Canadian institutions
- University of Toronto
- Funders
- EurostarsNatural Sciences and Engineering Research Council of CanadaEuropean CommissionEuropean Organization for the Exploitation of Meteorological SatellitesCentre National de la Recherche ScientifiqueUniversity of TorontoNational Science FoundationNova Scotia Research Innovation TrustBelgian Federal Science Policy OfficeMax-Planck-Institut für ChemieUniversité de La RéunionCentre National d’Etudes SpatialesOffice of Polar ProgramsServices Fédéraux des Affaires Scientifiques, Techniques et CulturellesFonds De La Recherche Scientifique - FNRSEnvironment and Climate Change CanadaUniversité de LiègeFP7 People: Marie-Curie ActionsCanadian Foundation for Climate and Atmospheric SciencesFédération Wallonie-BruxellesNational Aeronautics and Space AdministrationUniversität BremenForschungszentrum JülichNational Center for Atmospheric Research
- Keywords
- Formic acidChemistryFormaldehydeAtmospheric chemistryAerosolCarbon dioxideEnvironmental chemistryFlux (metallurgy)NucleationOrganic chemistryOzone
- Has abstract in OpenAlex
- yes