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| Titel |
Measurements of HOx radicals and the total OH reactivity (kOH) in the planetary boundary layer over southern Finland aboard the Zeppelin NT airship during the PEGASOS field campaign. |
| VerfasserIn |
Sebastian Broch, Sebastian Gomm, Hendrik Fuchs, Andreas Hofzumahaus, Frank Holland, Mathias Bachner, Birger Bohn, Rolf Häseler, Julia Jäger, Jennifer Kaiser, Frank Keutsch, Xin Li, Insa Lohse, Franz Rohrer, Mitchell Thayer, Ralf Tillmann, Robert Wegener, Thomas F. Mentel, Astrid Kiendler-Scharr, Andreas Wahner |
| 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 |
250093029
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| Publikation (Nr.) |
 EGU/EGU2014-7399.pdf |
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| Zusammenfassung |
| The concentration of hydroxyl (OH) and hydroperoxy (HO2) radicals (also named HOx) and
the total OH reactivity were measured over southern Finland and during transfer flights over
Germany, Denmark and Sweden aboard the Zeppelin NT airship within the framework of the
Pan-European Gas-AeroSOls-climate interaction Study (PEGASOS) field campaign in 2013.
The measurements were performed with a remotely controlled Laser Induced Fluorescence
(LIF) instrument which was installed on top of the airship. Together with a comprehensive set
of trace gas (O3, CO, NO, NO2, HCHO, HONO, VOCs), photolysis frequencies and aerosol
measurements as well as the measurement of meteorological parameters, these data provide
the possibility to test the current understanding of the chemical processes in the
planetary boundary layer (PBL) over different landscapes and in different chemical
regimes.
The unique flight performance of the Zeppelin NT allowed us to measure transects at a
constant altitude as well as vertical profiles within the range of 80 m to 1000 m above ground.
The transect flights show changes in the HOx distribution and kOH while crossing different
chemical regimes on the way from Friedrichshafen, Germany to Jämijärvi, Finland over
Germany, Denmark and Sweden. Vertical profile flights over the boreal forest close to
Jämijärvi and Hyytiälä (both Finland) gave the opportunity to investigate the layering of the
PBL and with that the vertical distribution of HOx and kOH with a high spatial and temporal
resolution. Gradients in the HOx concentration and kOH were measured between the
different layers during the early morning hours. The maximum radical concentrations found
during the campaign were 1.0 x 107 cm-3 for OH and 1.0 x 109 cm-3 for HO2. The
total OH reactivity measured in Finland was much lower than what was reported
before in the literature from ground based measurements and ranged from 1 s-1 to 6
s-1.
Acknowledgement: PEGASOS project funded by the European Commission under the
Framework Programme 7 (FP7-ENV-2010-265148) |
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