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| Titel |
Total OH reactivity at Hohenpeissenberg during HOPE-2012 |
| VerfasserIn |
Christian Plaß-Dülmer, Thomas Elste, Jennifer Englert, Stefan Gilge, Anja Werner |
| 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 |
250079163
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| Zusammenfassung |
| The total OH-reactivity was continuously measured at the GAW station Hohenpeissenberg in rural southern Germany during the Hohenpeissenberg Photochemical Experiment (HOPE-2012) in June-August 2012. These data complement the OH, H2SO4 and ROx measurements routinely run by this CIMS instrument. The Hohenpeissenberg chemical ionisation mass spectrometer (CIMS) was modified by adding a second SO2 titration zone downstream of the one used in routine OH measurements. The OH decay in the sample flow-tube is determined and the total OH reactivity is calculated from the differences of OH-signals of calibration (UV-photolysis of water vapour in ambient air) and ambient measurements in these two zones. Furthermore, a wall-loss rate is considered which is determined in zero gas measurements. Results of reactivity calibration measurements are presented and the uncertainty is evaluated. The hourly mean reactivity data show a diurnal pattern with a morning minimum at 4:00 of 3/s and a maximum of 5/s at 20:00 CET. The measured reactivities are compared to turnover-rates of reactive trace gases measured at the GAW station Hohenpeissenberg. |
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