THE CURRENT STATE AND FUTURE-DIRECTION OF EULERIAN MODELS IN SIMULATING THE TROPOSPHERIC CHEMISTRY AND TRANSPORT OF TRACE SPECIES - A REVIEW

Limitations on comprehensive tropospheric chemistry/transport models a re discussed within the context of a set of issues currently facing th e environmental scientific and policy-making communities. A number of central improvements are discussed in a prioritized manner, with consi deration of the key progress necessary to include feedback processes b etween meteorology and chemistry, aerosol formation in cloud developme nt with subsequent effects on wet removal, dry deposition and surface exchange processes, and impacts of chemical perturbations on radiation , climate, and weather. These improvements would result in a ''third-g eneration model''. The computational framework for this code is outlin ed, and estimates of required computer resources presented.