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This study presents an extended analysis of aerosol optical depth at 501 nm(AOD) in the Alpine valley of Innsbruck, Austria, from 2007 to 2023, and offersa comparative analysis with the Alpine station of Davos, Switzerland. AOD isderived from ground-based sunphotometer measurements of direct spectralirradiance during daytime. The Davos Station is part of the AErosol RoboticNETwork (AERONET), a global network providing high quality, ground based remotesensing aerosol data and complies with the relevant 5 requirements. TheInnsbruck station does not belong to AERONET, but the AOD retrieval algorithmis very similar. Building upon previous research conducted until 2012, thepresented study aims to provide a comprehensive understanding of the long-termtrends and seasonal variations in aerosol characteristics in Central Alpineregions. We observed the typical mid lattitude annual cycle with a maximum inJuly and a minimum in December. The AOD trends per decade for both stations aredeclining.

Extended Aerosol Optical Depth (AOD) time series analysis in an Alpine Valley: A Comparative Study from 2007 to 2023