New photolytic converter for improving aircraft measurements of NO2 via chemiluminescence

Content Provider	Scilit
Author	Nussbaumer, Clara M. Parchatka, Uwe Tadic, Ivan Bohn, Birger Marno, Daniel Martinez, Monica Rohloff, Roland Harder, Hartwig Kluge, Flora Pfeilsticker, Klaus Obersteiner, Florian Zöger, Martin Doerich, Raphael Crowley, John N. Lelieveld, Jos Fischer, Horst
Copyright Year	2021
Description	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 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 as well as the results of laboratory experiments to characterize the photolytic converter used. We identify a memory effect within the conventional photolytic converter 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. We test and characterize an alternative photolytic converter made from quartz glass which improves the reliability of NO2 measurements in laboratory and field studies.
e-ISSN	18678610
DOI	10.5194/amt-2021-180
Journal	Atmospheric Measurement Techniques Discussions
Volume Number	2021
Language	English
Publisher	Copernicus GmbH
Publisher Date	2021-07-14
Access Restriction	Open
Subject Keyword	Photolytic Converter No2 Measurements Aircraft Measurements
Content Type	Text
Resource Type	Article