RESEARCH NEEDS IN HETEROGENEOUS TROPOSHERIC CHEMISTRY.
The role of heterogeneous reactions and processes in the troposphere has been critically assessed by a group of 30 experts from government, universities, and industry. The results of this assessment, including identification and prioritization of a number of important and scientifically tractable reactions and processes, as well as recommendations of ways in which they can be incorporated into the existing NASA tropospheric chemistry program are presented. Also presented is a detailed summary of the considerations that led to the group's recommendations. The key cycles in tropospheric chemistry, including those for nitrogen, sulfur, carbon, and the halogens, are described to the extent possible with the present level of understanding, and data needed to remove conceptual uncertainties and/or to improve quantitative predictive capabilities are noted. Refs.
