KIT | KIT-Bibliothek | Impressum | Datenschutz

Modification of a conventional photolytic converter for improving aircraft measurements of NO2 via chemiluminescence

Nussbaumer, Clara M.; Parchatka, Uwe; Tadic, Ivan; Bohn, Birger; Marno, Daniel; Martinez, Monica; Rohloff, Roland; Harder, Hartwig; Kluge, Flora; Pfeilsticker, Klaus; Obersteiner, Florian ORCID iD icon 1; Zöger, Martin; Doerich, Raphael; Crowley, John N.; Lelieveld, Jos; Fischer, Horst
1 Karlsruher Institut für Technologie (KIT)

Abstract:

Nitrogen oxides (NOx≡NO+NO2) are centrally involved in the photochemical processes taking place in the Earth's atmosphere. Measurements of NO2, particularly in remote areas where concentrations are of the order of parts per trillion by volume (pptv), are still a challenge and subject to extensive research. In this study, we present NO2 measurements via photolysis–chemiluminescence during the research aircraft campaign CAFE Africa (Chemistry of the Atmosphere – Field Experiment in Africa) 2018 around Cabo Verde and the results of laboratory experiments to characterize the photolytic converter used. We find the NO2 reservoir species MPN (methyl peroxy nitrate) to produce the only relevant thermal interference in the converter under the operating conditions during CAFE Africa. We identify a memory effect within the conventional photolytic converter (type 1) associated with high NO concentrations and rapidly changing water vapor concentrations, accompanying changes in altitude during aircraft measurements, which is due to the porous structure of the converter material. As a result, NO2 artifacts, which are amplified by low conversion efficiencies, and a varying instrumental background adversely affect the NO2 measurements. ... mehr

Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Atmosphärische Spurengase und Fernerkundung (IMKASF)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 20.10.2021
Sprache Englisch
Identifikator ISSN: 1867-1381, 1867-8548
KITopen-ID: 1000139740
HGF-Programm 12.11.13 (POF IV, LK 01) Long-term trends of global atmospheric composition
Erschienen in Atmospheric Measurement Techniques
Verlag Copernicus Publications
Band 14
Heft 10
Seiten 6759-6776
Nachgewiesen in Dimensions
Web of Science
OpenAlex
Scopus

Verlagsausgabe §
DOI: 10.5445/IR/1000139740
Veröffentlicht am 12.11.2021
Originalveröffentlichung
DOI: 10.5194/amt-14-6759-2021
Scopus
Zitationen: 16
Web of Science
Zitationen: 17
Dimensions
Zitationen: 20
Seitenaufrufe: 108
seit 13.11.2021
Downloads: 47
seit 12.12.2021
Cover der Publikation
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page