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| Titel |
OH and RO2 radicals at Dome C (East Antarctica): first observations and assessment of photochemical budget |
| VerfasserIn |
Alexandre Kukui, Rodrigue Loisil, Michael Kerbrat, Markus Frey, Jaime Gil Roca, Bruno Jourdain, Gérard Ancellet, Slimane Bekki, Michel Legrand, Susanne Preunkert |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250078568
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| Zusammenfassung |
| Measurements of OH and total peroxy RO2 (HO2 + organic peroxy) radicals were
performed in December 2011/January 2012 at the Dome C Concordia station (East
Antarctica, 75.1Ë S / 123.3Ë E) in the frame of the Oxidant Production over Antarctic
Land and its Export (OPALE) project. The goal of these first on the East Antarctica
plateau radical measurements was to estimate the oxidative capacity and assess the
role of snow emissions on the radical budget in this part of Antarctica. The OH
concentration levels were found to be in general similar to those observed at South Pole.
However, based on the analysis of the OH sources and sinks derived from the available
measurements of NOx, HONO, HCHO, H2O2 and others, it has been concluded
that, in contrast to South Pole, the photolysis of HONO is the major OH source at
Dome C site. The role of HONO as the major source of OH is also supported by
an excellent correlation of OH with the production rate of OH from the HONO
photolysis. The observed diurnal profiles of OH and RO2 are discussed in relation with
boundary dynamics and the variability of photolysis and snow emissions rates. |
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