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| Titel |
Emission sources contributing to tropospheric ozone over Equatorial Africa during the summer monsoon |
| VerfasserIn |
I. Bouarar, K. S. Law, M. Pham, C. Liousse, H. Schlager, T. Hamburger, C. E. Reeves, J.-P. Cammas, P. Nédélec, S. Szopa, F. Ravegnani, S. Viciani, F. D'Amato, A. Ulanovsky, A. Richter |
| 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 ; 11, no. 24 ; Nr. 11, no. 24 (2011-12-22), S.13395-13419 |
| Datensatznummer |
250010309
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| Publikation (Nr.) |
 copernicus.org/acp-11-13395-2011.pdf |
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| Zusammenfassung |
| A global chemistry-climate model LMDz_INCA is used to investigate the
contribution of African and Asian emissions to tropospheric ozone over
Central and West Africa during the summer monsoon. The model results
show
that ozone in this region is most sensitive to lightning NOx and to
Central African biomass burning emissions. However, other emission
categories also contribute significantly to regional ozone. The maximum
ozone changes due to lightning NOx occur in the upper troposphere
between 400 hPa and 200 hPa over West Africa and downwind over the Atlantic
Ocean. Biomass burning emissions mainly influence ozone in the lower and
middle troposphere over Central Africa, and downwind due to westward
transport. Biogenic emissions of volatile organic compounds, which can be
uplifted from the lower troposphere to higher altitudes by the deep
convection that occurs over West Africa during the monsoon season, lead to
maximum ozone changes in the lower stratosphere region. Soil NOx
emissions over the Sahel region make a significant contribution to ozone in
the lower troposphere. In addition, convective uplift of these emissions and
subsequent ozone production are also an important source of ozone in the
upper troposphere over West Africa. Concerning African anthropogenic
emissions, they only make a small contribution to ozone compared to the
other emission categories. The model results indicate that most ozone
changes due to African emissions occur downwind, especially over the
Atlantic Ocean, far from the emission regions. The import of Asian emissions
also makes a considerable contribution to ozone concentrations above 150 hPa
and has to be taken into account in studies of the ozone budget over Africa.
Using IPCC AR5 (Intergovernmental Panel on Climate Change; Fifth Assessment
Report) estimates of anthropogenic emissions for 2030 over Africa and Asia,
model calculations show larger changes in ozone over Africa due to growth in
Asian emissions compared to African emissions over the next 20 yr. |
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