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| Titel |
A New Calibration Method for the HALOX In-Situ ClO Dimer Measurement |
| VerfasserIn |
Fred Stroh, Olga Sumińska, Florian Heinecke, Marc von Hobe, Tobias Wegner |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250057413
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| Zusammenfassung |
| HALOX is an in-situ instrument to measure ClO, ClO dimer, and BrO by the technique of
thermal dissociation (of the dimer) followed by chemical conversion and resonance
fluorescence (CCRF) detection of the halogen atoms. The instrument was installed onboard
the high-flying research aircraft M55 Geophysica during the RECONCILE Arctic campaign
in early 2010 and has provided data on 12 out of 13 flights.
In order to calibrate the efficiency of the heater element to thermally dissociate the ClO
dimer a new technique has been worked out based on pre-synthesized ClOOCl that is mixed
into a flow of pre-cooled air or nitrogen into a fast flow experiment and then detected
downstream by the HALOX CCRF system. This technique avoids high concentrations of
ozone or Cl2O which are otherwise needed to generate the dimer online in the flow system.
Thereby the system is much better confined chemically and provides a more accurate
calibration.
Details of the experimental setup and the procedure will be presented on the poster and
the impact on the quality of the aquired ClO dimer data and their potential to better confine
the atmospheric ClOx partitioning will be discussed. |
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