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Airborne observations of peroxy radicals during the EMeRGe campaign in Europe

George, Midhun; Andrés Hernández, Maria Dolores; Nenakhov, Vladyslav; Liu, Yangzhuoran; Burrows, John Philip; Bohn, Birger; Förster, Eric ORCID iD icon 1; Obersteiner, Florian ORCID iD icon 1; Zahn, Andreas 1; Harlaß, Theresa; Ziereis, Helmut; Schlager, Hans; Schreiner, Benjamin; Kluge, Flora; Bigge, Katja; Pfeilsticker, Klaus
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF), Karlsruher Institut für Technologie (KIT)

Abstract:

In this study, airborne measurements of the sum of hydroperoxyl (HO$_2$) and organic peroxy (RO$_2$) radicals that react with nitrogen monoxide (NO) to produce nitrogen dioxide (NO$_2$), coupled with actinometry and other key trace gases measurements, have been used to test the current understanding of the fast photochemistry in the outflow of major population centres. The measurements were made during the airborne campaign of the EMeRGe (Effect of Megacities on the transport and transformation of pollutants on the Regional to Global scales) project in Europe on board the High Altitude and Long Range Research Aircraft (HALO). The measurements of RO$^∗_2$ on HALO were made using the in situ instrument Peroxy Radical Chemical Enhancement and Absorption Spectrometer (PeRCEAS). RO$^∗_2$ is to a good approximation the sum of peroxy radicals reacting with NO to produce NO$_2$. RO$^∗_2$ mixing ratios up to 120 pptv were observed in air masses of different origins and composition under different local actinometric conditions during seven HALO research flights in July 2017 over Europe.
Radical production rates were estimated using knowledge of the photolysis frequencies and the RO$^∗_2$ precursor concentrations measured on board, as well as the relevant rate coefficients. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162408
Veröffentlicht am 27.09.2023
Originalveröffentlichung
DOI: 10.5194/acp-23-7799-2023
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1680-7316, 1680-7324
KITopen-ID: 1000162408
HGF-Programm 12.11.13 (POF IV, LK 01) Long-term trends of global atmospheric composition
Erschienen in Atmospheric Chemistry and Physics
Verlag European Geosciences Union (EGU)
Band 23
Heft 13
Seiten 7799 – 7822
Vorab online veröffentlicht am 14.07.2023
Nachgewiesen in Dimensions
Web of Science
Scopus
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