AMT Atmospheric Measurement Techniques AMT Atmos. Meas. Tech. 1867-8548 Copernicus Publications Göttingen, Germany 10.5194/amt-6-1707-2013 Evaluation of the Lidar/Radiometer Inversion Code (LIRIC) to determine microphysical properties of volcanic and desert dust Wagner J. 1 Ansmann A. 1 Wandinger U. 1 Seifert P. 1 Schwarz A. 1 Tesche M. https://orcid.org/0000-0003-0096-4785 2 Chaikovsky A. 3 Dubovik O. https://orcid.org/0000-0003-3482-6460 4 Leibniz Institute for Tropospheric Research, Leipzig, Germany Department of Environmental Science, Stockholm University, Stockholm, Sweden Institute of Physics, National Academy of Science, Minsk, Belarus Laboratory of Atmospheric Optics, Lille University 1, Villeneuve d'Ascq, France 22 07 2013 6 7 1707 1724 Copyright: © 2013 J. Wagner et al. 2013 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://amt.copernicus.org/articles/6/1707/2013/amt-6-1707-2013.html The full text article is available as a PDF file from https://amt.copernicus.org/articles/6/1707/2013/amt-6-1707-2013.pdf

The Lidar/Radiometer Inversion Code (LIRIC) combines the multiwavelength lidar technique with sun/sky photometry and allows us to retrieve vertical profiles of particle optical and microphysical properties separately for fine-mode and coarse-mode particles. After a brief presentation of the theoretical background, we evaluate the potential of LIRIC to retrieve the optical and microphysical properties of irregularly shaped dust particles. The method is applied to two very different aerosol scenarios: a strong Saharan dust outbreak towards central Europe and an Eyjafjallajökull volcanic dust event. LIRIC profiles of particle mass concentrations for the coarse-mode as well as for the non-spherical particle fraction are compared with results for the non-spherical particle fraction as obtained with the polarization-lidar-based POLIPHON method. Similar comparisons for fine-mode and spherical particle fractions are presented also. Acceptable agreement between the different dust mass concentration profiles is obtained. LIRIC profiles of optical properties such as particle backscatter coefficient, lidar ratio, Ångström exponent, and particle depolarization ratio are compared with direct Raman lidar observations. Systematic deviations between the LIRIC retrieval products and the Raman lidar measurements of the desert dust lidar ratio, depolarization ratio, and spectral dependencies of particle backscatter and lidar ratio point to the applied spheroidal-particle model as main source for these uncertainties in the LIRIC results.

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