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| Titel |
The detection of nocturnal N2O5 as HNO3 by alkali- and aqueous-denuder techniques |
| VerfasserIn |
G. J. Phillips, U. Makkonen, G. Schuster, N. Sobanski, H. Hakola, J. N. Crowley |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 2 ; Nr. 6, no. 2 (2013-02-05), S.231-237 |
| Datensatznummer |
250017385
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| Publikation (Nr.) |
 copernicus.org/amt-6-231-2013.pdf |
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| Zusammenfassung |
| The almost total anthropogenic control of the nitrogen cycle has led to wide
ranging trans-national and national efforts to quantify the effects of
reactive nitrogen on the environment. A number of monitoring techniques have
been developed for the measurement of nitric acid and subsequent estimation
of nitrogen deposition within large networks and for process studies on
shorter measurement campaigns. We discuss the likelihood that many of these
techniques are sensitive to another important gas-phase component of oxidized
nitrogen: dinitrogen pentoxide (N2O5). We present measurements
using a MARGA wet annular denuder device alongside measurements of
N2O5 with a discussion of evidence from the laboratory and the
field which suggests that alkali- and aqueous-denuder measurements are
sensitive to the sum of HNO3 + 2N2O5. Nocturnal data from
these denuder devices should be treated with care before using HNO3
concentrations derived from these data. This is a systematic error which is
highly dependent on ambient conditions and is likely to cause systematic
misinterpretation of datasets in periods where N2O5 is significant
proportion of NOy. It is also likely that deposition estimates of
HNO3 via data obtained with these methods is compromised to greater and
lesser extents depending on the season and environment of the sampling
location. |
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