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13 October 2008 New results from continuous mixing layer height monitoring in urban atmosphere
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Mixing layer height was continuously monitored by uninterrupted remote sensing measurements with ceilometer, sodar and RASS in Augsburg. The Vaisala ceilometers LD40 and CL31 were used which are eye-safe commercial lidar systems. Special software for these ceilometers provides routine retrievals of lower atmosphere layering from vertical profiles of laser backscatter data. These remote sensing instruments were operated at three different sites: at the northern edge (CL31 or LD40, RASS), in the middle (CL31) and at the southern edge of the town (sodar). A comparison of the different results during simultaneous measurements was performed. The information content of the different remote sensing instruments for mixing layer height was analysed further. The ceilometer measurements add information about the range-dependant aerosol concentration; gradient minima within this profile mark the borders of mixed layers. The sodar measurements detect the height of a turbulent layer characterized by high acoustic backscatter intensities due to thermal fluctuations and a high variance of the vertical velocity component. The RASS measurements provide the vertical temperature profile from the detection of acoustic signal propagation. Different measurement examples will be presented to demonstrate the information about the mixing layer height.
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Klaus Schäfer, Stefan Emeis, Carsten Jahn, Christoph Münkel, Stefanie Schrader, and Markus Höß "New results from continuous mixing layer height monitoring in urban atmosphere", Proc. SPIE 7107, Remote Sensing of Clouds and the Atmosphere XIII, 71070A (13 October 2008);

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