Impact of deep convection in the tropical tropopause layer in West Africa: in-situ observations and mesoscale modelling

We present the analysis of the impact of convection on the composition of the tropical tropopause layer region (TTL) in West-Africa during the AMMA-SCOUT campaign. Geophysica M55 aircraft observations of water vapor, ozo
We present the analysis of the impact of convection on the composition of the tropical tropopause layer region (TTL) in West-Africa during the AMMA-SCOUT campaign. Geophysica M55 aircraft observations of water vapor, ozone, aerosol and CO2 show perturbed values at altitudes ranging from 14 km to 17 km (above the main convective outflow) and satellite data indicates that air detrainment is likely originated from convective cloud east of the flight. Simulations of the BOLAM mesoscale model, nudged with infrared radiance temperatures, are used to estimate the convective impact in the upper troposphere and to assess the fraction of air processed by convection. The analysis shows that BOLAM correctly reproduces the location and the vertical structure of convective outflow. Model-aided analysis indicates that in the outflow of a large convective system, deep convection can largely modify chemical composition and aerosol distribution up to the tropical tropopause. Model analysis also shows that, on average, deep convection occurring in the entire Sahelian transect (up to 2000 km E of the measurement area) has a non negligible role in determining TTL composition.
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Author:Federico Fierli, Emiliano Orlandi, Kathy S. Law, Chiara Cagnazzo, Francesco Cairo, Cornelius Schiller, Stephan Borrmann, Guido Di Donfrancesco, Fabrizio Ravegnani, C.-Michael Volk
URN:urn:nbn:de:hebis:30:3-292557
URL:http://www.atmos-chem-phys-discuss.net/10/4927/2010/
DOI:http://dx.doi.org/10.5194/acpd-10-4927-2010
ISSN:1680-7367
ISSN:1680-7375
Parent Title (English):Atmospheric chemistry and physics / Discussions, 10.2010, S. 4927-4961
Publisher:European Geosciences Union
Place of publication:Katlenburg-Lindau
Document Type:Article
Language:English
Date of Publication (online):2010/02/18
Date of first Publication:2010/02/18
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2013/03/20
Volume:10
Pagenumber:35
First Page:4927
Last Page:4961
Note:
© Author(s) 2010. This work is distributed under the Creative Commons Attribution 3.0 License.
HeBIS PPN:335507492
Institutes:Geowissenschaften
Dewey Decimal Classification:550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0

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