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@ARTICLE{Nussbaumer:902286,
author = {Nussbaumer, Clara M. and Parchatka, Uwe and Tadic, Ivan and
Bohn, Birger and Marno, Daniel and Martinez, Monica and
Rohloff, Roland and Harder, Hartwig and Kluge, Flora and
Pfeilsticker, Klaus and Obersteiner, Florian and Zöger,
Martin and Doerich, Raphael and Crowley, John N. and
Lelieveld, Jos and Fischer, Horst},
title = {{M}odification of a conventional photolytic converter for
improving aircraft measurements of ${NO}\<sub\>2\</sub\>$
via chemiluminescence},
journal = {Atmospheric measurement techniques},
volume = {14},
number = {10},
issn = {1867-8548},
address = {Katlenburg-Lindau},
publisher = {Copernicus},
reportid = {FZJ-2021-04149},
pages = {6759 - 6776},
year = {2021},
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. We test and
characterize an alternative photolytic converter (type 2)
made from quartz glass, which improves the reliability of
NO2 measurements in laboratory and field studies.},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {2111 - Air Quality (POF4-211)},
pid = {G:(DE-HGF)POF4-2111},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000710519000001},
doi = {10.5194/amt-14-6759-2021},
url = {https://juser.fz-juelich.de/record/902286},
}