The COVID-19 pandemic caused unprecedented global impacts on human mobility, including a significant reduction in marine traffic. This study quantifies and maps the global change in marine traffic during the first half of 2020 using Automatic Identification System (AIS) data. Results show decreases in 70.2% of Exclusive Economic Zones (EEZs), with variations aligned with confinement measures. Global declines peaked in April, with a 1.4% reduction in traffic occupancy. Passenger vessels experienced the most significant and prolonged decreases. A regional assessment in the Western Mediterranean provided insights into recovery pace and long-term changes. This approach guides large-scale monitoring of COVID-19's effects on vessel traffic, influencing the blue economy and ocean health.

David March, Kristian Metcalfe, Joaquin Tintoré, Brendan J. Godley