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| Titel |
Nocturnal chemistry of iodine and nitrogen oxides - results from the iNOCHES campaign |
| VerfasserIn |
Dean Venables, Cornelius Zetzsch, Eoin Wilson, Ravi Varma, Christoph Kleinschmitt, Denis Pöhler, Stefan Schmitt, Ulrich Platt, Sergej Bleicher, Julian Wittmer |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250087334
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| Publikation (Nr.) |
 EGU/EGU2014-1367.pdf |
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| Zusammenfassung |
| Recent field observations have led to suggestions that nitrogen oxide processes, and
particularly the formation of IONO2, are critical to the nocturnal fate of atmospheric iodine.
IONO2 decomposes on a timescale of several minutes to IO and NO2 and is an important
tropospheric reservoir for iodine, but large uncertainties remain concerning both the rate
coefficients of its formation and decomposition, and of its absorption cross-section
and photolysis rate. To better constrain these uncertainties, a series of chamber
experiments was carried out to investigate these reactions and molecular properties. The
iodine-Nitrogen Oxides CHamber ExperimentS (iNOCHES) campaign involved groups from
Bayreuth, Cork, and Heidelberg and early results from the campaign are presented here.
Instrumentation included an unusually high number of broadband optical cavity
spectrometers, providing direct measurements of NO2, IO, OIO, I2, NO3, and IONO2 in the
near-UV, blue, green, and red spectral regions. Most reactions were carried out
under dark conditions and at different temperatures. Because different reaction
pathways dominate in the absence of light, the iNOCHES study complements other
investigations of some of the same reactions via photolytically-initiated chemistry. |
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