 |
| Titel |
Nocturnal nitrogen oxides at a rural mountain-site in south-western Germany |
| VerfasserIn |
J. N. Crowley, G. Schuster, N. Pouvesle, U. Parchatka, H. Fischer, B. Bonn, H. Bingemer, J. Lelieveld  |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 6 ; Nr. 10, no. 6 (2010-03-25), S.2795-2812 |
| Datensatznummer |
250008257
|
| Publikation (Nr.) |
 copernicus.org/acp-10-2795-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| A new, two-channel instrument for simultaneous NO3 and N2O5
monitoring was used to make the first comprehensive set of nocturnal NOx
measurements (NO, NO2, NO3 and N2O5) at the Taunus
Observatory, a rural mountain site (Kleiner Feldberg) in South-western
Germany. In May 2008, NO3 and N2O5 mixing ratios were well
above the instrumental detection limit (a few ppt) on all nights of the
campaign and were characterised by large variability. The concentrations of
NO3, N2O5 and NO2 were consistent with the equilibrium
constant, K2, defining the rates of formation and thermal dissociation
of N2O5. A steady-state lifetime analysis is consistent with the
loss of nocturnal NOx being dominated by the reaction of NO3 with
volatile organic compounds in this forested region, with N2O5
uptake to aerosols of secondary importance. Analysis of a limited dataset
obtained at high relative humidity indicated that the loss of N2O5
by reaction with water vapour is less efficient (>factor 3) than derived
using laboratory kinetic data. The fraction of NOx present as NO3 and
N2O5 reached ~20% on some nights, with night-time
losses of NOx competing with daytime losses. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|