Funding:

Financial support for travelling, accommodation, and transport of the instruments was provided by national and international sources.

We gratefully acknowledge financial support by:
	EUROCHAMP – A European Union FP6 project
	Forschungszentrum Jülich, Institute of Chemistry and Dynamics of the Geosphere (ICG-1)
	Forschungszentrum Karlsruhe, Institute for Meteorology and Climate Research (IMK-AAF)