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Through measurements of NO2, O3 and NO3during the PARADE campaign (PArticles and RAdicals, Diel observations ofmEchanisms of oxidation) in the German Taunus mountains we derive nighttimesteady-state lifetimes (τss) of NO3 and N2O5.During some nights, high NO3 (∼ 200 pptv) andN2O5 (∼ 1 ppbv) mixing ratios were associated withvalues of τss that exceeded 1 h for NO3 and 3 h for N2O5 near the ground. Such long boundary-layer lifetimes forNO3 and N2O5 are usually only encountered in veryclean/unreactive air masses, whereas the PARADE measurement site is impactedby both biogenic emissions from the surrounding forest and anthropogenicemissions from the nearby urbanised/industrialised centres. Measurement ofseveral trace gases which are reactive towards NO3 indicates that theinferred lifetimes are significantly longer than those calculated from thesummed loss rate. Several potential causes for the apparently extendedNO3 and N2O5 lifetimes are examined, including additionalroutes to formation of NO3 and the presence of a low-lying residuallayer. Overall, the most likely cause of the anomalous lifetimes are relatedto the meteorological conditions, though additional NO3 formation dueto reactions of Criegee intermediates may contribute

Chemical and meteorological influences on the lifetime of NO&lt;sub&gt;3&lt;/sub&gt; at a semi-rural mountain site during PARADE

Chemical and meteorological influences on the lifetime of NO<sub>3</sub> at a semi-rural mountain site during PARADE