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Proceedings Paper

Determination of mixing layer height from ceilometer backscatter profiles
Author(s): Marijn de Haij; Wiel Wauben; Henk Klein Baltink
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Paper Abstract

Mixing layer height (MLH) is a key parameter in many atmospheric boundary layer studies and processes. A Wavelet method is developed for the automatic determination of mixing layer height from backscatter profiles of an LD-40 ceilometer. Furthermore, a quality flag is introduced to identify unreliable MLH detections. The performance of the Wavelet MLH algorithm is analysed by comparing the results with MLH estimates from radiosondes, wind profiler and research lidar measurements. A correlation coefficient of 0.64 is found between ceilometer and radiosonde determinations when using only ceilometer MLH detections with good quality. A statistical analysis of the ceilometer MLH for a six year data set shows satisfactory results for availability and the results show the main characteristics of MLH, i.e. the diurnal and seasonal cycle. However, problems arise e.g. in case of multiple (well defined) aerosol layers, which renders the selection of the correct mixing layer top ambiguous. Furthermore, in spring and summer the detection of the MLH for deep (convective) boundary layer often fails. This is mostly due to the high variability of the aerosol backscatter signal with height which limits the range for MLH estimation in those conditions.

Paper Details

Date Published: 11 October 2006
PDF: 12 pages
Proc. SPIE 6362, Remote Sensing of Clouds and the Atmosphere XI, 63620R (11 October 2006); doi: 10.1117/12.691050
Show Author Affiliations
Marijn de Haij, Royal Netherlands Meteorological Institute (Netherlands)
Wiel Wauben, Royal Netherlands Meteorological Institute (Netherlands)
Henk Klein Baltink, Royal Netherlands Meteorological Institute (Netherlands)

Published in SPIE Proceedings Vol. 6362:
Remote Sensing of Clouds and the Atmosphere XI
James R. Slusser; Klaus Schäfer; Adolfo Comerón, Editor(s)

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