Papers are solicited on the processes that control the chemistry of the global atmosphere and the connections between global atmospheric chemistry and climate. Tropospheric topics of special interest are biogenic sources of atmospheric chemicals, tropospheric photochemistry, heterogeneous reactions and removal processes, and long-range transport and global distributions of various species. Contributions are also sought on the atmospheric components of biogeochemical cycles, the relationships between tropospheric and stratospheric chemistry, and climate and relevant experimental research in instrument development and laboratory photochemistry and kinetics.