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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

originally proposed to fly in formation with the Earth Observing System (EOS) Aqua satellite to provide profile information to supplement observations of aerosol, cloud, and radiative fluxes being acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS) and Clouds and the Earth’s Radiant Energy System (CERES) instruments ( Winker et al. 2003 ). This initial concept of CALIPSO and Aqua flying in formation has grown into a formation of 5 satellites [CALIPSO, CloudSat, Aqua , Aura , and

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Kathleen A. Powell, Chris A. Hostetler, Mark A. Vaughan, Kam-Pui Lee, Charles R. Trepte, Raymond R. Rogers, David M. Winker, Zhaoyan Liu, Ralph E. Kuehn, William H. Hunt, and Stuart A. Young

the two 532-nm detection channels. The PGR operation calculates the ratio of the nearly equal optical fluxes incident on the parallel- and perpendicular-channel detectors as a spatial pseudodepolarizer is inserted into the 532-nm receiver optical path ( Hunt et al. 2009 ). 2. Basic equations and nomenclature a. Lidar equation and calibration coefficient The lidar signals are acquired as profile elements separated by approximately 15 m in range along the path of the laser pulse. An illustration of

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