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| Titel |
Understanding HOx in the African Tropical Troposphere |
| VerfasserIn |
R. Commane, C. Floquet, T. Ingham, D. E. Heard, D. Stone, M. J. Evans |
| 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 |
250024197
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| Zusammenfassung |
| The hydroxyl radical (OH) is the primary oxidant in the troposphere, dominating the
processing of both biogenic and anthropogenic trace gases. The interconversion of OH and
HO2 is fast and the ratio of OH/HO2 provides information on the recycling between the
species.
The first observations of OH and HO2 in West Africa were made aboard the UK FAAM
BAe-146 aircraft using an airborne FAGE instrument during the AMMA project in 2006.
Saharan, forest, anthropogenic and oceanic-influenced airmasses were sampled
over a large range of altitudes and a strong latitudinal gradient was observed in
biogenically emitted species. The spatial and temporal variation of HOx in these
different airmasses is discussed and the primary production pathways of HOx are
examined.
Tropospheric photochemistry is investigated using an observationally constrained
box-model run to diurnal steady state. The chemical schemes used are described in the
Master Chemical Mechanism (MCM, v3.1) and the model has the potential to run chemistry
schemes from global models (e.g. TOMCAT, GEOS-CHEM, etc.).
Modelled HOx is compared with the aircraft observations to investigate the mechanisms
controlling radical chemistry and test our understanding of tropical chemistry in a variety of
environments. |
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