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| Titel |
An overview of two years of ozone radio soundings over Cotonou as part of AMMA |
| VerfasserIn |
V. Thouret, M. Saunois, A. Minga, A. Mariscal, B. Sauvage, A. Solete, D. Agbangla, P. Nédélec, C. Mari, C. E. Reeves, H. Schlager |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 16 ; Nr. 9, no. 16 (2009-08-28), S.6157-6174 |
| Datensatznummer |
250007593
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| Publikation (Nr.) |
 copernicus.org/acp-9-6157-2009.pdf |
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| Zusammenfassung |
| As part of the African Monsoon Multidisciplinary Analysis (AMMA) program, a total
of 98 ozone vertical profiles over Cotonou, Benin, have been measured during a
26 month period (December 2004–January 2007). These regular measurements
broadly document the seasonal and interannual variability of ozone in both
the troposphere and the lower stratosphere over West Africa for the first time.
This data set is complementary to the MOZAIC observations made from Lagos between
0 and 12 km during the period 1998–2004. Both data sets highlight the unique
way in which West Africa is impacted by two biomass burning seasons: in
December–February (dry season) due to burning in the Sahelian band and in
June-August (wet season) due to burning in southern Africa. High interannual
variabilities between Cotonou and Lagos data sets and within each data set are
observed and are found to be a major characteristic of this region. In particular,
the dry and wet seasons are discussed in order to set the data of the Special
Observing Periods (SOPs) into a climatological context. Compared to other dry
and wet seasons, the 2006 dry and wet season campaigns took place in rather
high ozone environments. During the sampled wet seasons, southern intrusions
of biomass burning were particularly frequent with concentrations up to 120 ppbv
of ozone in the lower troposphere. An insight into the ozone distribution in
the upper troposphere and the lower stratosphere (up to 26 km) is given. The
first tropospheric columns of ozone based on in-situ data over West Africa are
assessed. They compare well with satellite products on seasonal and interannual
time-scales, provided that the layer below 850 hPa where the remote instrument
is less sensitive to ozone, is removed. |
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