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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

backscatter present at altitudes within the calibration range can be derived from other measurements such as the 20-yr Stratospheric Aerosol and Gas Experiment (SAGE) II aerosol record ( Thomason and Peter 2006 ). The current calibration procedure does not include such a model and globally defines R̂ ‖ to unity. Plans are in progress to modify the calibration to include the contribution of aerosol backscatter in future versions of the CALIOP data products. The two-way signal attenuation term T̂ 2

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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

surface to several kilometers in altitude, are sometimes misclassified as aerosol. We plan to develop latitude-dependent PDFs for future data releases to improve the classification in the polar regions. 4. Summary In this paper, we have reviewed the theoretical basis of the CALIOP cloud and aerosol discrimination (CAD) algorithm, and described the enhancements incorporated into the version 2 algorithm that is used in the current data release (release 2). We also presented preliminary assessment

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William H. Hunt, David M. Winker, Mark A. Vaughan, Kathleen A. Powell, Patricia L. Lucker, and Carl Weimer

within the canister, and possibly associated damage to the electronics, if the pressure is allowed to drop too low. A switch to the backup laser is planned for late February 2009, when the primary laser pressure is expected to be about a factor of 2 above the corona threshold of 1.9 psi. (iii) Low-energy laser shots Although the peak-to-peak energy variation between shots over a short time is typically less than 1.5%, there are very occasional shots with much lower energy. As of 1 June 2008, about 0

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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

encountered under favorable conditions, S a is computed directly from the integrated backscatter and transmission following Eqs. (1) – (3) . Combined with a carefully planned validation campaign, this will allow improvements of the method, accuracy, and confidence in the selection of S a . The algorithm also generates aerosol-type confidence flags as functions of uncertainties in the 532- and 1064-nm integrated backscatter values. Aerosol layers over polar regions can either be clean continental or

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