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Ulrich Löhnert, S. Crewell, O. Krasnov, E. O’Connor, and H. Russchenberg

expansions of the IPT will consist of including measurements from infrared sensors [e.g., a radiometer in the 9–12- μ m range or a highly spectrally resolving Atmospheric Emitted Radiance Interferometer (AERI)]. The retrievals will then also be made physically consistent with the infrared radiances, leading to more accurate retrievals of low water content (<30 g m −2 ) liquid clouds, which are momentarily difficult to detect with HATPRO, but still have a large impact on the solar radiation balance

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Matthias Grzeschik, Hans-Stefan Bauer, Volker Wulfmeyer, Dirk Engelbart, Ulla Wandinger, Ina Mattis, Dietrich Althausen, Ronny Engelmann, Matthias Tesche, and Andrea Riede

of the European Research Action COST-720, “Integrated Ground-based Remote-Sensing Stations for Atmospheric Profiling.” Therefore, we are focusing on the impact of Raman lidar data assimilation. Impact studies of new observation systems have to be separated in different steps. First of all, an extensive analysis of the performance of the Raman lidar systems is essential. As the corresponding inversion of the lidar radiation transfer equation for deriving water vapor is unique, this procedure is

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Daniela Nowak, Dominique Ruffieux, Judith L. Agnew, and Laurent Vuilleumier

estimated using for example incoming longwave radiation and surface parameters ( Dürr and Philipona 2004 ). However, this method does not include information on cloud-base and -top height, and such measurements are crucial for a variety of applications. Cloud-base and -top heights are important in order to describe the impact of clouds in a changing climate ( Ramanathan et al. 1989 ), and there is a general need for improvement of automatic cloud observation at weather stations and continuous cloud

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Thierry Leblanc, I. Stuart McDermid, and Robin A. Aspey

1. Introduction Water vapor has long been identified as a key constituent of the atmosphere. Because of its particular shape, the water vapor molecule strongly absorbs infrared radiation and consequently water vapor constitutes a primary greenhouse gas. Studies have reported (e.g., de Forster and Shine 1999 ) that a global increase in lower-stratospheric H 2 O mixing ratio, similar to that observed locally since 1981 ( Oltmans and Hofmann 1995 ), would contribute to a surface warming reaching

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Steven E. Koch, Cyrille Flamant, James W. Wilson, Bruce M. Gentry, and Brian D. Jamison

sensitive to the locally enhanced moisture at this level caused by the solitary wave lifting). These features cannot be clouds because there is no evidence in the DIAL data of significant signal attenuation, nor did the Homestead surface infrared radiation data show any evidence of fluctuations near the time of bore passage. Because the layer was nearly saturated, the oscillatory features may be thought of collectively as a haze layer. Time traces of assorted variables derived from the 15-min

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