Locating the mixing layer: algorithms to identify the mixing layer height using lidar signals

Jan Mehnert; Markus Pesch

doi:10.1117/12.738008

3 October 2007 Locating the mixing layer: algorithms to identify the mixing layer height using lidar signals

Jan Mehnert, Markus Pesch

Proceedings Volume 6750, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing III; 67500B (2007) https://doi.org/10.1117/12.738008
Event: SPIE Remote Sensing, 2007, Florence, Italy

Abstract

The mixing layer (ML) provides a vertical atmospheric barrier and its height has become an important parameter in meteorology and air quality control. In locating the mixing layer using Lidar it has always to be considered that the signals may be biased by noise and the mixing layer itself can contain more than a single layer. In previous studies use was made of the fact that the main part of aerosols are located within the mixing layer and outside this layer, in the so called free atmosphere, the concentration of aerosols decreased significantly. This leads to a sharp change of the backscattering signal at the boundary layers. In this paper an algorithm is presented that determines the height of the mixing layer (MLH) by an intensive analysis of the global and local maxima of the Lidar signal and its first derivative. The algorithm searches for a maximum of the backscatter signal followed by a minimum in the first derivative. The results are compared with the MLH calculated by a model.

Citation Download Citation

Jan Mehnert and Markus Pesch "Locating the mixing layer: algorithms to identify the mixing layer height using lidar signals", Proc. SPIE 6750, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing III, 67500B (3 October 2007); https://doi.org/10.1117/12.738008

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