The ECMWF Re-Analysis (ERA40) is a global atmospheric analysis of many conventional observations and satellite data streams for the period Sept,1957- Aug,2002. There are numerous data products that are separated into dataset series based on resolution, vertical coordinate reference, and likely research applications. Descriptions of the series organization and direct links to information about all ERA40 products are available.

This dataset has been segmented into 3 archives:

• Surface - 47 mostly surface and near surface fields, including 10m wind, 2m air temp, soil temp and moisture, cloud cover info
• Vertical Integrals - 35 fields including column water vapor, column ozone, kinetic energy
• Accumulated (other) Fields - 27 fields including precip, fluxes, radiation, stresses

Monthly means have been computed for each analysis hour as well as a daily mean.