EGUsphere EGUsphere EGUsphere EGUsphere Copernicus Publications Göttingen, Germany 10.5194/egusphere-2026-2958 Overhaul of the stratospheric lidar at Dumont d’Urville, Antarctica: three-wavelength setup, processing and observations Tencé Florent https://orcid.org/0000-0002-4921-3918 1 Jumelet Julien 1 Hassen-Khodja Rafik 2 Bounissou Sophie 2 Mariscal Jean-François 2 Charlet Ismaël 3 LATMOS/IPSL, Sorbonne Université, UVSQ, CNRS, Paris, France LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France IPEV, Institut Paul-Émile Victor, Plouzané, France 22 07 2026 2026 1 24 Copyright: © 2026 Florent Tencé et al. 2026 This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/ This article is available from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-2958/ The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2026/egusphere-2026-2958/egusphere-2026-2958.pdf

The stratospheric cloud and aerosol lidar instrument Liraan (<em>LIdar pour la Recherche Antarctique A&eacute;rosol et Nuages</em>) has been operated at the French Antarctic station Dumont d'Urville since 1989. Following a major upgrade conducted between 2022 and 2024, this paper presents the instrument configuration and its scientific capabilities. Liraan now enables the retrieval of backscatter coefficients at 355 nm, 532 nm and 1064 nm and depolarization ratios at 355 nm and 532 nm. The new configuration is described in detail, along with an improved data inversion algorithm, which is further used as input to a dedicated microphysical retrieval methodology. A unified 532 nm lidar time series spanning 1991<span>&ndash;</span>2025 at Dumont d'Urville is also presented for the first time. Finally, 2025 multispectral lidar measurements are used in a case study of volcanic aerosol size distribution retrieval.