Our session “Dynamics and chemistry of the upper troposphere and stratosphere: observations and models” is a long-running element of the AS programme. As in previous years we invite presentations that cover the whole spectrum of upper tropospheric and stratospheric composition-climate research, including interactions. We are looking forward hearing about new measurements (using in-situ or remote sensing methods) and their interpretation and about new modelling studies (using a range of different models) trying to understand composition-climate interactions.

This year a particular focus is on issues relating to the Chemistry-Climate Model Initiative (CCMI). Our invited speaker is Dr L. Oman from NASA/Goddard. He will talk on ENSO effects on trace gases.