An improved algorithm for retrieving the fine-mode fraction of aerosol optical thickness, part 1: Algorithm development

a Department of Land Surveying and Geo-Informatics, The Hong Kong Polytechnic University, Hong Kong, China b Department of Atmospheric and Oceanic Science, and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, USA c State Key Laboratory of Earth Surface Processes and Resource Ecology and College of Global Change and Earth System Science, Beijing Normal University, Beijing, China d Department of Geography, San Diego State University, San Diego, CA, USA e School of Earth Sciences and Engineering, Hohai University, Nanjing, China f College of Resource Environment and Tourism, Capital Normal University, Beijing, China