A NASA polar-orbiting satellite, part of the Earth Observing System, the third to be launched (after the Terra and Aqua satellites). Its principal mission is to monitor atmospheric chemistry and dynamics, particularly the anticipated recovery in the ozone layer and reduction in the ozone holes. Its instruments are primarily designed to study the distribution and concentration of trace gases and aerosols in the upper troposphere and stratosphere. It is currently last in the Afternoon-Train satellite constellation. See also Calipso; Cloudsat; Orbiting Carbon Observatory; Parasol.
Subjects: Meteorology and Climatology — Astronomy and Astrophysics.