Lewis, BrentonLiang, Mao-ChangBlake, GeoffreyYung, Yuk L2015-12-080027-8424http://hdl.handle.net/1885/36012The isotopic composition of long-lived trace molecules provides a window into atmospheric transport and chemistry. Carbon dioxide is a particularly powerful tracer, because its abundance remains > 100 parts per million by volume (ppmv) in the mesosphere.Keywords: carbon dioxide; isotope; oxygen; ozone; altitude; atmosphere; atmospheric transport; biogeochemical cycling; biosphere; chemistry; dissociation; fractionation; isotope analysis; Lyman alpha radiation; mass independent fractionation; mathematical parameter Biogeochemical cycles; CO 2; Mesosphere; StratosphereOxygen isotopic composition of carbon dioxide in the middle atmosphere200710.1073/pnas.06100091042015-12-08