Due to the recent increase in Arctic shipping, 2006-2020 June October Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), Moderate Resolution Imaging Spectroradiometer (MODIS) Collection 6.1 (C6.1), and Multi-Angle Implementation of Atmospheric Correction (MAIAC) retrieved aerosol optical depth (AOD) data were examined for changes AOD from period 1 (P1, 2006-2012) 2 (P2, 2014-2020 (P2). ...