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OSIRIS: A Decade of Scattered Light

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  • 1 Air Quality Research Division, Environment Canada, Toronto, Ontario, and Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 2 Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 3 Department of Earth and Space Sciences, Chalmers University of Technology, Göteborg, Sweden
  • 4 Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada
  • 5 Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 6 NorthWest Research Associates, Inc., Redmond, Washington, and Centre for Research in Earth and Space Science, York University, Toronto, Ontario, Canada
  • 7 Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 8 Centre for Research in Earth and Space Science, York University, Toronto, Ontario, Canada
  • 9 Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 10 Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, Canada, and Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts
  • 11 Department of Earth and Space Science and Engineering, York University, Toronto, Ontario, Canada
  • 12 Department of Earth and Space Sciences, Chalmers University of Technology, Göteborg, and Department of Meteorology, Stockholm University, Stockholm, Sweden
  • 13 Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Canada
  • 14 Institute of Environmental Physics, University of Bremen, Bremen, Germany
  • 15 Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, and Department of Physics, University of Toronto, Toronto, Ontario, Canada
  • 16 Air Quality Research Division, Environment Canada, Toronto, Ontario, Canada
  • 17 Department of Earth and Space Science and Engineering, York University, Toronto, Ontario, Canada
  • 18 Department of Physics, University of Toronto, Toronto, Ontario, Canada
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On 20 February 2001, a converted Russian ICBM delivered Odin, a small Swedish satellite, into low Earth orbit. One of the sensors onboard is a small Canadian spectrometer called OSIRIS. By measuring scattered sunlight from Earth's horizon, or limb, OSIRIS is able to deduce the abundance of trace gases and particles from the upper troposphere into the lower thermosphere. Designed and built on a modest budget, OSIRIS has exceeded not only its 2-yr lifetime but also all expectations. With more than a decade of continuous data, OSIRIS has recorded over 1.8 million limb scans. The complexities associated with unraveling scattered light in order to convert OSIRIS spectra into highquality geophysical profiles have forced the OSIRIS team to develop leading-edge algorithms and computer models. These profiles are being used to help address many science questions, including the coupling of atmospheric regions (e.g., stratosphere–troposphere exchange) and the budgets and trends in ozone, nitrogen, bromine, and other species. One specific example is the distribution and abundance of upper-tropospheric, lightning-produced reactive nitrogen and ozone. Arguably OSIRIS's most important contributions come from its aerosol measurements, including detection and characterization of subvisual cirrus and polar stratospheric and mesospheric clouds. OSIRIS also provides a unique view of the stratospheric aerosol layer, and it is able to identify and track perturbations from volcanic activity and biomass burning.

CORRESPONDING AUTHOR: C. A. McLinden, Air Quality Research Division, Environment Canada, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada, E-mail: chris.mclinden@ec.gc.ca

On 20 February 2001, a converted Russian ICBM delivered Odin, a small Swedish satellite, into low Earth orbit. One of the sensors onboard is a small Canadian spectrometer called OSIRIS. By measuring scattered sunlight from Earth's horizon, or limb, OSIRIS is able to deduce the abundance of trace gases and particles from the upper troposphere into the lower thermosphere. Designed and built on a modest budget, OSIRIS has exceeded not only its 2-yr lifetime but also all expectations. With more than a decade of continuous data, OSIRIS has recorded over 1.8 million limb scans. The complexities associated with unraveling scattered light in order to convert OSIRIS spectra into highquality geophysical profiles have forced the OSIRIS team to develop leading-edge algorithms and computer models. These profiles are being used to help address many science questions, including the coupling of atmospheric regions (e.g., stratosphere–troposphere exchange) and the budgets and trends in ozone, nitrogen, bromine, and other species. One specific example is the distribution and abundance of upper-tropospheric, lightning-produced reactive nitrogen and ozone. Arguably OSIRIS's most important contributions come from its aerosol measurements, including detection and characterization of subvisual cirrus and polar stratospheric and mesospheric clouds. OSIRIS also provides a unique view of the stratospheric aerosol layer, and it is able to identify and track perturbations from volcanic activity and biomass burning.

CORRESPONDING AUTHOR: C. A. McLinden, Air Quality Research Division, Environment Canada, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada, E-mail: chris.mclinden@ec.gc.ca
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