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| Titel |
Observed and simulated global distribution and budget of atmospheric C2-C5 alkanes |
| VerfasserIn |
Andrea Pozzer, Jan Pollmann, Domenico Taraborrelli, Patrick Joeckel, Detlev Helmig, Peter Tans, Jacques Hueber, Jos Lelieveld  |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250040462
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| Zusammenfassung |
| The primary sources and atmospheric chemistry of C2-C5 alkanes have been incorporated
into the atmospheric chemistry general circulation model EMAC (ECHAM5/MESSy
Atmospheric Chemistry). Model output is compared with new observations from the
NOAA/ESRL GMD cooperative air sampling network. Based on the global coverage of the
data, two different anthropogenic emission datasets for C4-C5 alkanes, widely used in the
modelling community, are evaluated. We show that the model reproduces the main
atmospheric features of the C2-C5 alkanes (e.g., seasonality). While the simulated values of
ethane and propane are within a 20% range of the measurements, larger deviations are found
for the other tracers. Finally the effect of C3-C5 alkanes on the concentration of acetone and
acetaldehyde are assessed. Their chemical sources are largely controlled by the
reaction with OH, while the reactions with NO3 and Cl contribute only to a little
extent. |
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