title: Chemical evolution on the giant planets and Titan.
abstract: We summarize the current status of atmospheric chemistry in the atmospheres of the outer solar system with special emphasis on the question of HCN formation on Jupiter, differences between polar and equatorial compositions on Jupiter, the coloration of the Great Red Spot, and the unique environment of Titan.
authors.affiliation: Department of Earth and Space Sciences, State University of New York, Stony Brook 11794, USA.
authors.forename: J
authors.initials: J
authors.lastname: Caldwell
authors.forename: T
authors.initials: T
authors.lastname: Owen
mesh_terms: D000641:Ammonia / Q000737:chemistry; D001272:Atmosphere / Q000737:chemistry*; D019418:Evolution, Chemical; D005740:Gases / Q000032:analysis*; D018538:Jupiter; D008697:Methane / Q000737:chemistry; D018541:Neptune; D010720:Phosphines / Q000737:chemistry; D010777:Photochemistry; D018539:Saturn; D018540:Uranus; D014867:Water / Q000737:chemistry
chemical_list: D005740:Gases; D010720:Phosphines; D014867:Water; D000641:Ammonia; C044646:phosphine; D008697:Methane