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@ARTICLE{Wildt:151893,
author = {Wildt, J. and Mentel, T. F. and Kiendler-Scharr, A. and
Hoffmann, T. and Andres, S. and Ehn, M. and Kleist, E. and
Müsgen, Peter and Rohrer, F. and Rudich, Y. and Springer,
M. and Tillmann, R. and Wahner, A.},
title = {{S}uppression of new particle formation from monoterpene
oxidation by ${NO}\<sub\>x\</sub\>$},
journal = {Atmospheric chemistry and physics},
volume = {14},
number = {6},
issn = {1680-7324},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2014-01743},
pages = {2789 - 2804},
year = {2014},
abstract = {The impact of nitrogen oxides (NOx = NO + NO2) on new
particle formation (NPF) and on photochemical ozone
production from real plant volatile organic compound (BVOC)
emissions was studied in a laboratory setup. At high NOx
conditions ([BVOC] / [NOx] < 7, [NOx] > 23 ppb) new particle
formation was suppressed. Instead, photochemical ozone
formation was observed resulting in higher hydroxyl radical
(OH) and lower nitrogen monoxide (NO) concentrations. When
[NO] was reduced back to levels below 1 ppb by OH reactions,
NPF was observed. Adding high amounts of NOx caused NPF to
be slowed by orders of magnitude compared to analogous
experiments at low NOx conditions ([NOx] ~300 ppt), although
OH concentrations were higher. Varying NO2 photolysis
enabled showing that NO was responsible for suppression of
NPF. This suggests that peroxy radicals are involved in NPF.
The rates of NPF and photochemical ozone production were
related by power law dependence with an exponent approaching
−2. This exponent indicated that the overall peroxy
radical concentration must have been similar when NPF
occurred. Thus, permutation reactions of first-generation
peroxy radicals cannot be the rate limiting step in NPF from
monoterpene oxidation. It was concluded that permutation
reactions of higher generation peroxy-radical-like
intermediates limit the rate of new particle formation.In
contrast to the strong effects on the particle numbers, the
formation of particle mass was substantially less sensitive
to NOx concentrations. If at all, yields were reduced by
about an order of magnitude only at very high NOx
concentrations.},
cin = {IBG-2 / IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IBG-2-20101118 / I:(DE-Juel1)IEK-8-20101013},
pnm = {89582 - Plant Science (POF2-89582) / 233 - Trace gas and
aerosol processes in the troposphere (POF2-233)},
pid = {G:(DE-HGF)POF2-89582 / G:(DE-HGF)POF2-233},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000334104700004},
doi = {10.5194/acp-14-2789-2014},
url = {https://juser.fz-juelich.de/record/151893},
}