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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-310
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 22 Oct 2018

Research article | 22 Oct 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Optimal Estimation Method Retrievals of Stratospheric Ozone Profiles from a DIAL Lidar

Ghazal Farhani1, Robert J. Sica1, Sophie Godin-Beekmann2, and Alexander Haefele3 Ghazal Farhani et al.
  • 1Department of Physics and Astronomy, The University of Western Ontario, London, Canada
  • 2Observatoire de Versailles Saint-Quentin-en-Yvelines, Guyancourt, France
  • 3Federal Office of Meteorology and Climatology MeteoSwiss, Payerne, Switzerland

Abstract. This paper provides a detailed description of the first principle Optimal Estimation Method (OEM) which is applied to ozone retrieval analysis using Differential Absorption Lidar (DIAL) measurements. The air density, detector dead times, background coefficients, and lidar constants are simultaneously retrieved along with ozone density profiles. Using an averaging kernel, the OEM provides the vertical resolution of the retrieval as a function of altitude. A maximum acceptable height at which the a priori has a small contribution to the retrieval is calculated for each profile as well. Moreover, a complete uncertainty budget including both systematic and statistical uncertainties is given for each individual retrieved profile. Long term stratospheric DIAL ozone measurements have been carried out at the Observatoire de Haute-Provence (OHP) since 1985. The OEM is applied to 3 nights of measurements at OHP during an intensive ozone campaign in July 2017 where coincident lidar-ozonesonde measurements are available. The retrieved ozone density profiles are in good agreement with both traditional analysis and the ozonesonde measurements. For the three nights of measurements, below 15km the difference between the OEM and the sonde profiles is less than 25%, at altitudes between 15km to 25km the difference is less than 10%, and the OEM can successfully catch many variations of ozone which are detected in the sonde profiles due to its ability to adjust its vertical resolution as the signal varies. Above 25km the difference between the OEM and the sonde profiles does not exceed 20%.

Ghazal Farhani et al.
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Short summary
This manuscript presents a new application of the Optimal Estimation Method (OEM) for the retrieval of ozone density profiles from DIAL lidar measurements. The OEM results show excellent agreement with coincident ozonesonde measurements, with improved resolution over the traditional technique. The method also provides averaging kernels (facilitating comparison with other instruments), the vertical resolution of the retrieval, and a complete random and systematic uncertainty budget.
This manuscript presents a new application of the Optimal Estimation Method (OEM) for the...
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