Geophysikalisches Kolloquium: Aerosols and cloud processes in the Tropics: Results from in-situ measurements within the tropical transition layer and the stratosphere above

The Tropical Transition Layer (TTL) is located roughly between the level of neutral buoyancy in the tropics and a level somewhat above the thermal tropopause. This layer has certain peculiarities which are of relevance for the
global upper troposphere and lower stratosphere (UT/LS).

Between January 2005 and August 2006 in-situ measurements were performed up to 21 kilometers altitude within the SCOUT-O3 and the AMMA-SCOUT framework in the tropical and mid-latitude UT/LS utilizing the Russian high altitude research aircraft M-55 "Geophysica". Results of ultrafine particle measurements are discussed from the TROCCINOX (2005, Aracatuba, Brazil), SCOUT-O3 (2005, Darwin, Australia) and AMMA-SCOUT (2006, Burkina Faso, West Africa) campaigns. Emphasis here are new particle formation processes in clear air, within anvils of mesoscale convective systemsm, and within convective outflows from clouds.

With respect to clouds results from measurements in cirrus over West African MCS systems and Cb overshoots in Australia are discussed as well as thin and subvisible cirrus cloud events.

Finally an overview over the available in-situ aerosol data from the tropics (including the NASA ER-2 and WB-57 measurements) is presented and conclusions concerning trends in high altitude aerosols at times of relative volcanic quiescence are drawn.




15:15 Uhr


Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg


Stephan Borrmann, Max-Planck-Institut für Chemie, Mainz


Martin Claussen
Bjorn Stevens

Zur Übersicht