Partitioning of reactive nitrogen (NOy) and dependence on meteorological conditions in the lower free troposphere
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Authors
Zellweger, Christoph
Forrer, Jann
Hofer, Peter
Nyeki, Stephan
Schwarzenbach, Beat
Ammann, Markus
Baltensperger, Urs
Author (Corporation)
Publication date
19.06.2003
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Type
01A - Journal article
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Parent work
Atmospheric Chemistry and Physics
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Volume
3
Issue / Number
3
Pages / Duration
779-796
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Publisher / Publishing institution
Copernicus
Place of publication / Event location
Göttingen
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Abstract
Results of continuous nitrogen oxide (NO), nitrogen dioxide (NO2), peroxyacetyl nitrate (PAN) and total reactive nitrogen (NOy) measurements along with seasonal field campaigns of nitric acid (HNO3) and particulate nitrate (NO3-) measurements are presented for a two-year period at the high-alpine research station Jungfraujoch (JFJ), 3580 m asl. The NOy mixing ratio and partitioning is shown to strongly depend on meteorological conditions. Knowledge of these meteorological transport processes allows discrimination between undisturbed (i.e. clean) and disturbed (i.e. influenced by regional pollution sources) free tropospheric (FT) conditions at the JFJ. Median NOy concentrations during undisturbed FT periods ranged from 350 pptv (winter, December to February) to 581 pptv (spring, March to May). PAN was found to be the dominant NOy species during spring and summer, whereas NO2 was most abundant during autumn and winter. Particulate nitrate was found to contribute significantly to total NOy during thermally induced vertical transport. Föhn events, synoptical lifting (e.g. fronts) and thermally induced vertical transport resulted in mixing ratios up to 10 times higher at the JFJ compared to undisturbed FT conditions. Furthermore, this meteorological variability of the NOy concentration and partitioning often dominated the seasonal variability. As a consequence the use of filters at the JFJ (and other mountainous sites) is crucial for the interpretation of data from such measurement sites. This study presents a further development of meteorological filters for the high-alpine site Jungfraujoch, which also could be modified and adapted to other mountainous measurement sites.
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Subject (DDC)
550 - Geowissenschaften
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ISBN
ISSN
1680-7324
1680-7316
1680-7316
Language
English
Created during FHNW affiliation
No
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Publication status
Published
Review
Peer review of the complete publication
Open access category
Gold
License
Citation
ZELLWEGER, Christoph, Jann FORRER, Peter HOFER, Stephan NYEKI, Beat SCHWARZENBACH, Ernest WEINGARTNER, Markus AMMANN und Urs BALTENSPERGER, 2003. Partitioning of reactive nitrogen (NOy) and dependence on meteorological conditions in the lower free troposphere. Atmospheric Chemistry and Physics. 19 Juni 2003. Bd. 3, Nr. 3, S. 779–796. DOI 10.5194/acp-3-779-2003. Verfügbar unter: https://doi.org/10.26041/fhnw-9849