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Ali H. Omar, David M. Winker, Mark A. Vaughan, Yongxiang Hu, Charles R. Trepte, Richard A. Ferrare, Kam-Pui Lee, Chris A. Hostetler, Chieko Kittaka, Raymond R. Rogers, Ralph E. Kuehn, and Zhaoyan Liu

1. Introduction Aerosol classification can take many forms. For the purpose of estimating human-induced aerosol radiative forcing estimates, aerosols are broadly classified as anthropogenic (urban/industrial pollution and biomass burning) and natural (desert dust, sea salt, biogenic, and volcanic) aerosols. For example, in estimating aerosol radiative forcing values, the most recent Intergovernmental Panel on Climate Change (IPCC) report ( Solomon et al. 2007 ) not only adopts broad

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Zhaoyan Liu, Mark Vaughan, David Winker, Chieko Kittaka, Brian Getzewich, Ralph Kuehn, Ali Omar, Kathleen Powell, Charles Trepte, and Chris Hostetler

backscatter and extinction ratios of key aerosol types derived from selected Aerosol Robotic Network locations. J. Geophys. Res. , 110 , D10S11 . doi:10.1029/2004JD005124 . Charlson, R. , Ackerman A. , Bender F. , Anderson T. , and Liu Z. , 2007 : On the climate forcing consequences of the albedo continuum between cloudy and clear air. Tellus , 59 , 715 – 727 . 10.1111/j.1600-0889.2007.00297.x Herman, J. R. , Bhartia P. K. , Torres O. , Hsu C. , Seftor C. , and Celarier E

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David M. Winker, Mark A. Vaughan, Ali Omar, Yongxiang Hu, Kathleen A. Powell, Zhaoyan Liu, William H. Hunt, and Stuart A. Young

coefficient, is associated with each aerosol type so that identification of aerosol type provides a value of S a to be used in the extinction retrieval. Aerosol type is also useful in its own right, because type identification is a step in the process of identification of the aerosol source and attribution of aerosol radiative forcing to natural or anthropogenic emissions. We have adopted an observation-based approach to defining representative aerosol types, as opposed to a synthetic approach (e

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Mark A. Vaughan, Kathleen A. Powell, David M. Winker, Chris A. Hostetler, Ralph E. Kuehn, William H. Hunt, Brian J. Getzewich, Stuart A. Young, Zhaoyan Liu, and Matthew J. McGill

1. Introduction On 28 April 2006, eight years of close collaboration between the National Aeronautics and Space Administration (NASA) and the Centre National d’Etudes Spatiales (CNES) came to fruition with the launch of the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) mission from Vandenberg Air Force Base in California ( Winker et al. 2007 ). Launched simultaneously with the Cloudsat satellite aboard a single Delta-II rocket, CALIPSO is now an integral part of

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