This title appears in the Scientific Report :
2011
Please use the identifier:
http://hdl.handle.net/2128/10028 in citations.
Impact of deep convection in the tropical tropopause layer in West Africa: in-situ observations and mesoscale modelling
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, ozone, aerosol and CO2 during August 2006 show perturbed values at altitudes rangin...
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Personal Name(s): | Fierli, F. |
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Orlandi, E. / Law, K.S. / Cagnazzo, c. / Borrmann, S. / Cairo, F. / Schiller, C. / Ravegnani, F. / Volk, M. | |
Contributing Institute: |
Stratosphäre; IEK-7 |
Published in: | Atmospheric chemistry and physics, 10 (2011) S. 201 - 214 |
Imprint: |
Katlenburg-Lindau
EGU
2011
|
Physical Description: |
201 - 214 |
Document Type: |
Journal Article |
Research Program: |
Atmosphäre und Klima |
Series Title: |
Atmospheric Chemistry and Physics
11 |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
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 during August 2006 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 to have originated from convective cloud east of the flights. 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 convection can influence the composition of the upper troposphere above the level of main outflow for an event of deep convection close to the observation site. Model analysis also shows that 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. |