The Reading Assimilated Atmospheric Satellite Data presents an analyses of stratospheric and tropospheric temperature, ozone and water vapour incorporating data from research satellites and operational observations, assimilated with the Hadley Centre Atmospheric Model (HADAM3) configuration of the Unified Model (UM).

This dataset includes 3-D global fields for selected periods of time in the 1990s and is produced as part of the Assimilation of Remote-sensed Data for Applications in the Atmospheric and Oceanographic Sciences (ARDAAOS) Natural Environment Research Council (NERC) thematic programme.