Preprints
https://doi.org/10.5194/amt-2020-78
https://doi.org/10.5194/amt-2020-78

  07 Apr 2020

07 Apr 2020

Review status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Mixing height derivation from aerosol lidar using machine learning: KABL and ADABL algorithms

Thomas Rieutord1, Sylvain Aubert2, and Tiago Machado1,2 Thomas Rieutord et al.
  • 1Centre National de Recherches Meteorologiques, Université de Toulouse, Météo-France, CNRS, Toulouse, France
  • 2Direction des Systèmes d’Observation, Météo-France, Toulouse, France

Abstract. Atmospheric boundary layer height (BLH) is a key parameter for several meteorological applications, for example air quality forecast. To measure it, a common practice is to use aerosol lidars: a strong decrease in the backscatter signal indicates the top of the boundary layer. This paper describes and compares two methods of machine learning to derive the BLH from backscatter profiles: the K-means algorithm and the AdaBoost algorithm. Their codes are available under a fully open access, with the name KABL (K-means for Atmospheric Boundary Layer) and ADABL (AdaBoost for Atmospheric Boundary Layer). Both methods are compared to the lidar manufacturer's software and to reference BLH derived from collocated radiosondes. The radiosondes are taken as the reference for all other methods. The comparison is carried out on a two-year long period (2017–2018) on 2 Meteo-France's operational network sites (Trappes and Brest). Results show that, although its training is limited, ADABL is performing better than KABL and can easily be improved by enhancing its training set. However, KABL can be easily adapted for other instrumental device and used to make instrument synergy, while ADABL must be fully re-trained at each change in the instrument settings.

Thomas Rieutord et al.

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Thomas Rieutord et al.

Model code and software

KABL first release T. Rieutord, S. Aubert, and T. Machado https://doi.org/10.5281/zenodo.3742682

Thomas Rieutord et al.

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Short summary
This article describes two methods to estimate the height of the very first layer of atmosphere. It is measured with aerosol lidars and the two new methods are based on machine learning. Both are open source and under free license. A sensitivity analysis and a 2-years evaluation against meteorological balloons were carried out. One method has a good agreement with balloons but is limited by training and the other has less good agreement with balloons but is more flexible.