Data · dataset · 2026
Field observational constraints on the controllers in glyoxal (CHOCHO) reactive uptake to aerosol
Listed in National Center for Atmospheric Research
Glyoxal (CHOCHO), the simplest dicarbonyl in the troposphere, is a potential precursor for secondary organic aerosol (SOA) and brown carbon (BrC) affecting air quality and climate.
Description
The airborne measurement of CHOCHO concentrations during the KORUS-AQ (KORea-US Air Quality study) campaign in 2016 enables detailed quantification of loss mechanisms pertaining to SOA formation in the real atmosphere. The production of this molecule was mainly from oxidation of aromatics (59 %) initiated by hydroxyl radical (OH).
CHOCHO loss to aerosol was found to be the most important removal path (69 %) and contributed to roughly similar to 20 % (3.7 mu g sm(-3) ppmv(-1) h(-1), normalized with excess CO) of SOA growth in the first 6 h in Seoul Metropolitan Area. A reactive uptake coefficient (gamma) of similar to 0.008 best represents the loss of CHOCHO by surface uptake during the campaign. To our knowledge, we show the first field observation of aerosol surface-area-dependent (A(surf)) CHOCHO uptake, which diverges from the simple surface uptake assumption as A(surf) increases in ambient condition.
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Specifically, under the low (high) aerosol loading, the CHOCHO effective uptake rate coefficient, k(eff,uptake), linearly increases (levels off) with A(surf); thus, the irreversible surface uptake is a reasonable (unreasonable) approximation for simulating CHOCHO loss to aerosol. Dependence on photochemical impact and changes in the chemical and physical aerosol properties "free water", as well as aerosol viscosity, are discussed as other possible factors influencing CHOCHO uptake rate.
Our inferred Henry's law coefficient of CHOCHO, 7.0x10(8) M atm(-1), is similar to 2 orders of magnitude higher than those estimated from salting-in effects constrained by inorganic salts only consistent with laboratory findings that show similar high partitioning into water-soluble organics, which urges more understanding on CHOCHO solubility under real atmospheric conditions.
Links
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- Publisher page n2t.org/ark:/85065/d79g5rb7 ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/field-observational-constraints-on-the-controllers-in-… ↗
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=b8ac7a18-5c69-483f-b4a1-7b150d4c1… ↗
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 | b8ac7a18-5c69-483f-b4a1-7b150d4c197d | 10 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 |