The Mars Climate Database (MCD) is a database of atmospheric statistics compiled from state-of-the art General Circulation Model (GCM) simulations of the Martian atmosphere. The models used to compile the statistics have been extensively validated using available observational data and represent the current best knowledge of the state of the Martian atmosphere given the observations and the physical laws which govern the atmospheric circulation and surface conditions on the planet.
The MCD contains simulated data on a 
longitude-latitude grid from the surface up to an approximate altitude of
90km. Four dust scenarios have been used representing moderate,
Viking-type conditions (without dust storms), clear atmosphere conditions
(perhaps similar to those observed by Phobos), a moderate global dust storm
and an intense global dust storm. Fields are stored 12 times a day for 12
Martian seasons to give a comprehensive representation of the annual and
diurnal cycles. The user is referred to the Detailed Design Document for
further information.
This document provides the user of the MCD with a description of how to access the data in the database. Descriptions of the models and of the validation procedure are available in other documents relating to the project.
The MCD can also be accessed in a variety of data formats using the World Wide Web at http://www.lmd.jussieu.fr/mars.html.