Nocturnal nitrogen oxides at a rural mountain-site in south-western Germany

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 (
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.
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Metadaten
Author:John Nicholas Crowley, Gerhard Schuster, Nicolas Pouvesle, Uwe Parchatka, Horst Fischer, Boris Bonn, Heinz Bingemer, Johannes Lelieveld
URN:urn:nbn:de:hebis:30-77981
DOI:http://dx.doi.org/10.5194/acp-10-2795-2010
ISSN:1680-7316
ISSN:1680-7324
Parent Title (English):Atmospheric chemistry and physics, 10.2010, S. 2795-2812
Publisher:European Geosciences Union
Place of publication:Katlenburg-Lindau
Document Type:Article
Language:English
Date of Publication (online):2010/03/25
Date of first Publication:2010/03/25
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2010/06/24
Volume:10
Pagenumber:18
First Page:2795
Last Page:2812
Note:
© Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License.
HeBIS PPN:22470074X
Institutes:Geowissenschaften
Dewey Decimal Classification:550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0

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