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High Spectral Resolution Lidar (HSRL) is an efficient tool for probing the vertical optical properties of aerosol particles, including the aerosol backscatter coefficient (\u03b2) and extinction coefficient (\u03b1), at multiple wavelengths. To swiftly process vast data volumes, address the ill-posedness of retrieval problems, and suit simpler lidar systems, this study proposes an algorithm (modified algorithm) for retrieving microphysical property profiles from the HSRL optical data targeting fine-mode aerosols, building upon a previous algorithm (basic algorithm). The modified algorithm is based on a look-up table (LUT) approach, combined with the k-nearest neighbor (k-NN) and random forest (RF) algorithms, and it optimizes the decision tree generation strategy, incorporating a self-posed scheme. In numerical simulation tests for different lidar configurations, the modified algorithm reduced retrieval errors by 41%, 30%, and 32% compared to the basic algorithm for 3\u03b2 + 2\u03b1, 3\u03b2 + 1\u03b1, and 2\u03b2 + 1\u03b1, respectively, with a remarkable improvement of stability. In two observation scenes of a field campaign, the median relative errors of the effective radius for 3\u03b2 + 2\u03b1 were 6% and \u22123%, and the median absolute errors of single-scattering albedo were 0.012 and 0.005. This method represents a further step toward the use of the LUT approach, with the potential to provide effective and efficient aerosol microphysical retrieval for simpler lidar systems, which could advance our understanding of aerosols\u2019 climatic, meteorological, and health impacts.<\/jats:p>","DOI":"10.3390\/rs16132265","type":"journal-article","created":{"date-parts":[[2024,6,21]],"date-time":"2024-06-21T05:33:28Z","timestamp":1718948008000},"page":"2265","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["A Modified Look-Up Table Based Algorithm with a Self-Posed Scheme for Fine-Mode Aerosol Microphysical Properties Inversion by Multi-Wavelength Lidar"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-1757-7109","authenticated-orcid":false,"given":"Zeyu","family":"Zhou","sequence":"first","affiliation":[{"name":"School of Electronic Information, Wuhan University, Wuhan 430072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yingying","family":"Ma","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430072, China"},{"name":"Hubei Luojia Laboratory, Wuhan University, Wuhan 430072, China"},{"name":"The Institute for Carbon Neutrality, Wuhan University, Wuhan 430072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3270-534X","authenticated-orcid":false,"given":"Zhenping","family":"Yin","sequence":"additional","affiliation":[{"name":"School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1601-8286","authenticated-orcid":false,"given":"Qiaoyun","family":"Hu","sequence":"additional","affiliation":[{"name":"UMR 8518\u2013LOA\u2013Laboratoire d\u2019Optique Atmosph\u00e9rique, CNRS, University of Lille, 59650 Villeneuve d\u2019Ascq, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Igor","family":"Veselovskii","sequence":"additional","affiliation":[{"name":"Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow 119991, Russia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Detlef","family":"M\u00fcller","sequence":"additional","affiliation":[{"name":"School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Gong","sequence":"additional","affiliation":[{"name":"School of Electronic Information, Wuhan University, Wuhan 430072, China"},{"name":"State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430072, China"},{"name":"The Institute for Carbon Neutrality, Wuhan University, Wuhan 430072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,6,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"164871","DOI":"10.1016\/j.scitotenv.2023.164871","article-title":"Long-term PM2.5 pollution over China: Identification of PM2.5 pollution hotspots and source contributions","volume":"893","author":"Ali","year":"2023","journal-title":"Sci. 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