ACE-2 took place from 16 June to 24 July 1997, over the sub-tropical North-East Atlantic.  The ACE-2 objectives were to:

1. Determine the physical, chemical, radiative and cloud nucleating properties of the major aerosol types in the North Atlantic region and investigate the relationships between these properties;
2. Quantify the physical and chemical processes controlling the evolution of the major aerosol types and in particular their physical, chemical, radiative and cloud nucleating processes;
3. Develop procedures to extrapolate aerosol properties and processes from the local to the regional and global scale, and assess the regional direct and indirect radiative forcing by aerosols in the North Atlantic region