chemical and meteorological influences on the lifetime of no3 at a semi-rural mountain site during parade
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2016
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Abstract
Through measurements of NO2, O3 and NO3
during the PARADE campaign (PArticles and RAdicals, Diel observations of
mEchanisms of oxidation) in the German Taunus mountains we derive nighttime
steady-state lifetimes (τss) of NO3 and N2O5.
During some nights, high NO3 (∼ 200 pptv) and
N2O5 (∼ 1 ppbv) mixing ratios were associated with
values of τss that exceeded 1 h for NO3 and 3 h for N2O5 near the ground. Such long boundary-layer lifetimes for
NO3 and N2O5 are usually only encountered in very
clean/unreactive air masses, whereas the PARADE measurement site is impacted
by both biogenic emissions from the surrounding forest and anthropogenic
emissions from the nearby urbanised/industrialised centres. Measurement of
several trace gases which are reactive towards NO3 indicates that the
inferred lifetimes are significantly longer than those calculated from the
summed loss rate. Several potential causes for the apparently extended
NO3 and N2O5 lifetimes are examined, including additional
routes to formation of NO3 and the presence of a low-lying residual
layer. Overall, the most likely cause of the anomalous lifetimes are related
to the meteorological conditions, though additional NO3 formation due
to reactions of Criegee intermediates may contribute.
| Reference Key |
sobanski2016atmosphericchemical
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|---|---|
| Authors | ;N. Sobanski;M. J. Tang;M. J. Tang;J. Thieser;G. Schuster;D. Pöhler;H. Fischer;W. Song;C. Sauvage;J. Williams;J. Fachinger;F. Berkes;F. Berkes;P. Hoor;U. Platt;J. Lelieveld;J. N. Crowley |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-4867-2016
|
| URL | |
| Keywords |
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