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@ARTICLE{Dewald:890998,
author = {Dewald, Patrick and Liebmann, Jonathan M. and Friedrich,
Nils and Shenolikar, Justin and Schuladen, Jan and Rohrer,
Franz and Reimer, David and Tillmann, Ralf and Novelli, Anna
and Cho, Changmin and Xu, Kangming and Holzinger, Rupert and
Bernard, François and Zhou, Li and Mellouki, Wahid and
Brown, Steven S. and Fuchs, Hendrik and Lelieveld, Jos and
Crowley, John N.},
title = {{E}volution of ${NO}\<sub\>3\</sub\>$ reactivity during the
oxidation of isoprene},
journal = {Atmospheric chemistry and physics},
volume = {20},
number = {17},
issn = {1680-7324},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2021-01305},
pages = {10459 - 10475},
year = {2020},
abstract = {In a series of experiments in an atmospheric simulation
chamber (SAPHIR,1 Forschungszentrum Jülich, Germany), NO3
reactivity (kNO3) resulting from the reaction of NO3 with
isoprene and stable trace gases formed as products was
measured directly using a flow tube reactor coupled to a
cavity ring-down spectrometer (FT-CRDS). The experiments
were carried out in both dry and humid air with variation of
the initial mixing ratios of ozone (50–100 ppbv),
isoprene (3–22 ppbv) and NO2 (5–30 ppbv). kNO3 was
in excellent agreement with values calculated from the
isoprene mixing ratio and the rate coefficient for the
reaction of NO3 with isoprene. This result serves to confirm
that the FT-CRDS returns accurate values of kNO3 even at
elevated NO2 concentrations and to show that reactions of
NO3 with stable reaction products like non-radical organic
nitrates do not contribute significantly to NO3 reactivity
during the oxidation of isoprene. A comparison of kNO3 with
NO3 reactivities calculated from NO3 mixing ratios and NO3
production rates suggests that organic peroxy radicals and
HO2 account for $∼50 \%$ of NO3 losses. This contradicts
predictions based on numerical simulations using the Master
Chemical Mechanism (MCM version 3.3.1) unless the rate
coefficient for reaction between NO3 and isoprene-derived
RO2 is roughly doubled to
∼5×10−12 cm3 molecule−1 s−1.},
cin = {IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-8-20101013},
pnm = {243 - Tropospheric trace substances and their
transformation processes (POF3-243)},
pid = {G:(DE-HGF)POF3-243},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000569419500001},
doi = {10.5194/acp-20-10459-2020},
url = {https://juser.fz-juelich.de/record/890998},
}