HR: 0800h
AN: A41A-0028    [Abstracts]
TI: Aerosol Retrieval in the Troposphere and Stratosphere with OSIRIS Limb Scattered Sunlight Measurements
AU: * Bourassa, A E
EM: bourassa@osirus.usask.ca
AF: University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2 Canada
AU: Degenstein, D A
EM: degenstein@osirus.usask.ca
AF: University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2 Canada
AU: Gattinger, R L
EM: gattinger@rogers.com
AF: University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2 Canada
AU: Llewellyn, E J
EM: edward.llewellyn@usask.ca
AF: University of Saskatchewan, 116 Science Place, Saskatoon, SK S7N 5E2 Canada
AB: The currently operational Canadian-built OSIRIS (Optical Spectrograph and InfraRed Imaging System) instrument on the Odin spacecraft includes a single line-of-sight spectrograph that measures limb scattered UV and visible sunlight with 1 nm resolution. Height profiles of the limb radiance from the upper troposphere and stratosphere are obtained at these wavelengths by scanning the optic axis of the instrument. These measurements are used to derive aerosol extinction and number density profiles in the upper troposphere and the stratosphere by using currently accepted climatological values for aerosol particle size and distribution and a radiative transfer model. The limb observation technique in combination with the sun-synchronous Odin orbit allows for a global retrieval of aerosol extinction over a relatively short time period on the order of a few days. This work presents the aerosol retrieval technique from the OSIRIS limb scattered sunlight measurements and provides global distributions of aerosol extinction that show evidence of upper troposphere-lower stratosphere exchange and seasonal trends.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0360 Transmission and scattering of radiation
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting