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Proceedings Paper

New results from continuous mixing layer height monitoring in urban atmosphere
Author(s): Klaus Schäfer; Stefan Emeis; Carsten Jahn; Christoph Münkel; Stefanie Schrader; Markus Höß
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Paper Abstract

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.

Paper Details

Date Published: 13 October 2008
PDF: 11 pages
Proc. SPIE 7107, Remote Sensing of Clouds and the Atmosphere XIII, 71070A (13 October 2008); doi: 10.1117/12.800358
Show Author Affiliations
Klaus Schäfer, Forschungszentrum Karlsruhe GmbH (Germany)
Stefan Emeis, Forschungszentrum Karlsruhe GmbH (Germany)
Carsten Jahn, Forschungszentrum Karlsruhe GmbH (Germany)
Christoph Münkel, Vaisala GmbH (Germany)
Stefanie Schrader, Forschungszentrum Karlsruhe GmbH (Germany)
Markus Höß, Forschungszentrum Karlsruhe GmbH (Germany)

Published in SPIE Proceedings Vol. 7107:
Remote Sensing of Clouds and the Atmosphere XIII
Richard H. Picard; Adolfo Comeron; Klaus Schäfer; Aldo Amodeo; Michiel van Weele, Editor(s)

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