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| Titel |
Stable carbon isotope ratio measurements of VOC over various source regions in Southern Germany aboard a Zeppelin |
| VerfasserIn |
R. Wegener, F. Holland, F. Rohrer, A. Wahner, M. Krebsbach, P. Knieling, H. P. Heuser, H. Spahn, R. Koppmann |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250028163
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| Zusammenfassung |
| On emission volatile organic compounds (VOC) contain a carbon isotope ratio specific to its
origin. Chemical processing alters the isotope ratio in the atmosphere. In summer 2007 air
samples were taken aboard a Zeppelin NT as part of the TRACKS campaign. The
airship was equipped with a comprehensive set of sensing instruments to enable the
characterization of the troposphere from 100 m to 1000 m above ground. VOC samples were
analyzed offline by gas chromatography / isotope mass spectrometry. A sample
volume of about 15 l of ambient air allowed the determination of isotopic carbon
ratios with an accuracy of about ±1 at ambient mixing ratios. Isotope ratio data of
different compounds were found to vary for different source regions and altitudes.
Aromatic compounds showed δ13C values between -20 and -30 per mil. Methanol
exhibited particularly low δ13C values over regions with pronounced biogenic emission,
where δ13C values up to -44 per mil were measured. Comparing isotope data with
online VOC measurements enables to evaluate the extent of air mass processing. |
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