A PILOT REANALYSIS PROJECT AT COLA

Results are presented from a retrospective analysis of 19 months (May 1982-November 1983) of global atmospheric observations. The National M eteorological Center Global Data Assimilation System was used in tande m with the atmospheric general circulation model of the Center for Oce an-Land-Atmosphere Studies to produce four-times-daily representations of the global atmosphere. Statistics were compiled regarding the use of data by the analysis and the decisions of the quality control proce dures. Comparison of the reanalyses with both observation and the arch ived contemporaneous analyses showed substantial improvements in the r epresentation of the global atmospheric circulation, possibly exceptin g the Southern Hemisphere south of 60 degrees S. A list of data produc ts from the reanalysis is given in an appendix.