Preprint FZJ-2021-04859

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png
Field observational constraints on the controllers in glyoxal (CHOCHO) loss to aerosol

 ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;  ;

2021
EGU Katlenburg-Lindau

Atmospheric chemistry and physics / Discussions () [10.5194/acp-2021-672]

This record in other databases:  

Please use a persistent id in citations:   doi:

Abstract: Abstract. Glyoxal (CHOCHO), the simplest dicarbonyl in the troposphere, is an important precursor for secondary organic aerosol (SOA) and brown carbon (BrC) affecting air-quality and climate. 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), of which glyoxal forming mechanisms are relatively well constrained. CHOCHO loss to aerosol was found to be the most important removal path (69 %) and contributed to roughly ~20 % (3.7 μg sm−3 ppmv−1 hr−1, normalized with excess CO) of SOA growth in the first 6 hours in Seoul Metropolitan Area. To our knowledge, we show the first field observation of aerosol surface-area (Asurf)-dependent CHOCHO uptake, which  diverges from the simple surface uptake assumption as Asurf increases in ambient condition. Specifically, under the low (high) aerosol loading, the CHOCHO effective uptake rate coefficient, keff,uptake, linearly increases (levels off) with Asurf, thus, the irreversible surface uptake is a reasonable (unreasonable) approximation for simulating CHOCHO loss to aerosol. Dependency of photochemical impact, as well as aerosol viscosity, are discussed as other possible factors influencing CHOCHO uptake rate. Our inferred Henry's law coefficient of CHOCHO, 7.0 × 108 M atm−1, is ~2 orders of magnitude  higher than those estimated from salting-in effects constrained by inorganic salts only, which urges more understanding on CHOCHO solubility under real atmospheric conditions.

Classification:

Contributing Institute(s):
  1. Troposphäre (IEK-8)
Research Program(s):
  1. 2111 - Air Quality (POF4-211) (POF4-211)

Appears in the scientific report 2021
Database coverage:
Medline ; Creative Commons Attribution CC BY 4.0 ; OpenAccess
Click to display QR Code for this record

The record appears in these collections:
Institutssammlungen > ICE > ICE-3
Dokumenttypen > Berichte > Vorabdrucke
Workflowsammlungen > Öffentliche Einträge
IEK > IEK-8
Publikationsdatenbank
Open Access

 Datensatz erzeugt am 2021-12-02, letzte Änderung am 2024-07-12


OpenAccess:
Volltext herunterladen PDF
Externer link:
Volltext herunterladenFulltext by OpenAccess repository
Dieses Dokument bewerten:

Rate this document:
1
2
3
 
(Bisher nicht rezensiert)