Changes in Aerosol Optical Depth over the Arctic Ocean as Seen by CALIOP, MAIAC, and MODIS C6.1

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). Herein, was statistically analyzed on a 0.25° × grid airsheds over various ocean basins north 59.75°N. According heatmaps correlation between ship traffic, fire emissions airsheds, all three products captured observed inter-annual variability wildfire occurrence well, showed Siberia more severe P2 than P1. Except Atlantic, North, Baltic Seas, Beaufort Sea, Barents indicated that higher P1, but disagreed magnitude. This fact suggests detection typical low Ocean might be rather qualitative quantitative. While increases due ships at berth, only MODIS C6.1 caught elevated shipping Siberian rivers. Obviously, sub-daily resolutions are required capture increased short-term events like traveling or short-interval fire.