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| Titel |
Role of the NO3 radicals in oxidation processes in the eastern Mediterranean troposphere during the MINOS campaign |
| VerfasserIn |
M. Vrekoussis, M. Kanakidou, N. Mihalopoulos, P. J. Crutzen  , J. Lelieveld , D. Perner, H. Berresheim, E. Baboukas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 4, no. 1 ; Nr. 4, no. 1 (2004-02-03), S.169-182 |
| Datensatznummer |
250001487
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| Publikation (Nr.) |
 copernicus.org/acp-4-169-2004.pdf |
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| Zusammenfassung |
During the MINOS campaign (28
July-18 August 2001) the nitrate (NO3) radical was measured at Finokalia station, on the north coast of Crete in
South-East Europe using a long path (10.4 km) Differential Optical Absorption Spectroscopy instrument
(DOAS). Hydroxyl (OH) radical was also measured by a Chemical Ionization Mass-Spectrometer
(Berresheim et al., 2003). These datasets represent the first simultaneous
measurements of OH and NO3 radicals in the area.
NO3 radical
concentrations ranged from less than 3x107 up to 9x108
radicals· cm-3 with an average nighttime value of 1.1x108
radicals· cm-3.
The observed NO3 mixing ratios are analyzed on the basis of the
corresponding meteorological data and the volatile organic compound (VOC) observations which were measured simultaneously at Finokalia station. The
importance of the NO3 radical chemistry relatively to that of OH in the
dimethylsulfide (DMS) and nitrate cycles is also investigated. The observed
NO3 levels regulate the nighttime variation of DMS. The loss of DMS by
NO3 during night is about
75% of that by OH radical during day. NO3 and nitrogen pentoxide
(N2O5) reactions account for about
21% of the total nitrate (HNO3(g)+NO-3(g))
production. |
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