The Open access to Mars Assimilated Remote Soundings (OpenMARS) database is a reanalysis product combining past spacecraft observations with a state-of-the-art Mars Global Circulation Model (GCM). The OpenMARS product is a global surface/atmosphere reference database of key variables for multiple Mars years.

Spacecraft observations of ozone column abundance from the SPICAM (Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars) instrument on the Mars Express spacecraft are combined with a Mars GCM used at the Open University. The database includes 3-hourly output of ozone column abundance.