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Proposing Institution

DLR Oberpfaffenhofen
Project Manager

Dr. Mattia Righi
Münchner Str. 20
82234 Weßling
The composition of the atmosphere, the stratospheric ozone layer, and the state of the global climate depend crucially on processes in the tropical regions, in particular at the tropical tropopause. The research project TROCCINOX investigates the impact of tropical deep convection on the distribution and the sources of trace gases, cloud and aerosol particles focusing on processes in the upper troposphere and lower stratosphere.The general objectives of TROCCINOX are:a) to improve the knowledge about lightning-produced NOx (LNOx) in tropical thunderstorms by quantifying the produced amounts, by comparing it to other major sources of NOx and by assessing its global impact, andb) to improve the current knowledge on the occurrence of other trace gases (including water vapour) and particles (ice crystal and aerosols) in the upper troposphere and lower stratosphere in connection with tropical deep convection as well as large scale upwelling motions.The scientific objectives of TROCCINOX are addressed by performing field experiments in the tropics including measurements on different spatial scales. Two fully instrumented research aircraft, the Russian M55 Geophysica and DLR's Falcon probed the large scale structure of the upper troposphere and lower stratosphere during transfer flights to and from Brazil during two field campaigns (February/March 2004, and January/February 2005). Numerical modelling of the observed processes with the new climate chemistry model system ECHAM5/MESSy will be carried out in order to improve understanding and quantification of the observed processes and assessments of their global impacts. Simulations with different parameterisations for lightning NOx emissions, and different source strenghts, will be performed. The sensitivity of the results to other natural sources like biomass burning emissions will be investigated by using different emission data sets.

Impressum, Conny Wendler