NASA Models and Measurements Intercomparison 2

Executive Summary: The Second Workshop on Stratospheric Models and Measurements Workshop (M&M II) is the continuation of the effort previously started in the first Workshop (M&M I, Prather and Remsberg [1993]) held in 1992. As originally stated, the aim of M&M is to provide a foundation for establishing the credibility of stratospheric models used in environmental assessments of the ozone response to chlorofluorocarbons, aircraft emissions, and other climate-chemistry interactions. To accomplish this, a set of measurements of the present day atmosphere was selected. The intent was that successful simulations of the set of measurements should become the prerequisite for the acceptance of these models as having a reliable prediction for future ozone behavior. The choice of the measurements for M&M I was limited by data availability, and the emphasis on 2-D and 3-D assessment models. Other models such as climate models, air-trajectory models and assimilation models were not included in the consideration. In M&M II, the GSFC DAO assimilation model provided results for a number of transport experiments. In this report, we emphasize what was accomplished beyond M&M I.