Data · dataset · 2026
Using TIMED/SABER nightglow observations to investigate hydroxyl emission mechanisms in the mesopause region
Listed in National Center for Atmospheric Research
Description
Thermosphere, Ionosphere, Mesosphere, Energetics, and Dynamics (TIMED)/Sounding of the Atmosphere Using Broadband Emission Radiometry (SABER) observations of vertical profiles of the OH nightglow emission rates, temperature, and ozone are used along with a theoretical model of the OH nightglow to distinguish the dominant mechanism for the nightglow. From the comparison between the model fit and the observations we conclude that the chemical reaction Oâ + HâOH(v ⤠9) + Oâ leads to population distributions of vibrationally excited states that are consistent with the measurements.
The contribution of the reaction HOâ + OâOH(v ⤠6) + Oâ to the nightglow is not needed to reproduce the measurements above 80 km, at least for the emissions originating from vibrational transitions with v ⤠4. The analysis also determines the best fits for quenching of OH(v) by Oâ and O. The results show that the quenching rate of OH(v) by O₂ is smaller and that the removal by O is larger than currently used for the analysis of SABER data.
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The rate constant for OH(v) quenching by Oâ decreases with temperature in the mesopause region. The vertical profiles of atomic oxygen and hydrogen retrieved using both 2.0 and 1.6 μ'm channels of Meinel band emission of the OH nightglow and the new quenching rates are slightly smaller than the profiles retrieved using only the 2.0 μm channel and the quenching rate coefficients currently used for the analysis of SABER data.
The fits of the model to the observations were also used to evaluate two other assumptions. The assumption of sudden death quenching of OH by Oâ and Nâ (i.e., quenching to the ground state rather than to intermediate vibrational levels) leads to poorer agreement with the SABER observations. The question of whether the reaction with or quenching by atomic oxygen depends on the OH vibrational level could not be resolved; assumptions of vibrational level dependence and independence both gave good fits to the observed emissions.
Links
Get the data
- Publisher page n2t.org/ark:/85065/d7dr2w6n ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/using-timed-saber-nightglow-observations-to-investigat… ↗
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=abdb8b03-6d41-4f2b-a285-5328d8797… ↗
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 | abdb8b03-6d41-4f2b-a285-5328d8797ab6 | 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 |