Data · dataset · 2026
Measurements of CHâOâNOâ in the upper troposphere
Listed in National Center for Atmospheric Research
Methyl peroxy nitrate (CHâOâNOâ) is a non-acyl peroxy nitrate that is important for photochemistry at low temperatures characteristic of the upper troposphere.
Description
We report the first measurements of CHâOâNOâ, which we achieved through a new aircraft inlet configuration, combined with thermal-dissociation laser-induced fluorescence (TD-LIF) detection of NOâ, and describe the accuracy, specificity, and interferences to CHâOâNOâ measurements.
CHâOâNOâ is predicted to be a ubiquitous interference to upper-tropospheric NOâ measurements. We describe an experimental strategy for obtaining NOâ observations free of the CHâOâNOâ interference. Using these new methods, we made observations during two recent aircraft campaigns: the Deep Convective Clouds and Chemistry (DC-3) and the Studies of Emissions and Atmospheric Composition, Clouds, and Climate Coupling by Regional Surveys (SEAC4RS) experiments.
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The CHâOâNOâ measurements we report have a detection limit (S/N = 2) of 15 pptv at 1 min averaging on a background of 200 pptv NOâ and an accuracy of ±40%. Observations are used to constrain the interference of pernitric acid (HOâNOâ) to the CHâOâNOâ measurements, as HOâNOâ partially decomposes (~11%) along with CHâOâNOâ in the heated CHâOâNOâ channel used to detect CHâOâNOâ.
Links
Get the data
- Publisher page n2t.org/ark:/85065/d7pn96s3 ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/measurements-of-chaoanoa-in-the-upper-troposphere ↗
National Center for Atmospheric Research dataset page
landing page · from data ucar edu
Catalogue records · 1
- CKAN API data.ucar.edu/api/3/action/package_show?id=82eb41d6-ddd8-4fe2-896b-8787dc708… ↗
metadata API · from data ucar edu
Topics
- From keywords
- Earth & Environmental Science · Ocean & Atmospheric Science
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| National Center for Atmospheric Research | 82eb41d6-ddd8-4fe2-896b-8787dc70825e | 13 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].local:field:earth-environmental | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| created_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| description | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /notes |
| publication_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| title | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /title |
| updated_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 |