Lake Ice Service Expansion and Utilization Report

Lake Ice Service for Arctic Climate and Safety is one of the eight services developed within the Horizon Europe Arctic PASSION project. The service provides near-real-time information on lake ice conditions in the Arctic, combining satellite observations, in-situ measurements, and community-based monitoring.The data are made openly accessible through the Tarkka web map platform developed by the Finnish Environment Institute (Syke). Since the publication of the Lake Ice Service Readiness Report in 2022 (Henilä et al, 2022), significant progress has been made to expand the service and improve its usability and societal relevance. The service has grown in data content, and in technical functionalities. New tools have been introduced to support community-based monitoring. This report outlines the main developments in the expansion and utilization of the Lake Ice Service. It describes how the service is being used by communities, authorities, scientists, citizens, and businesses, and highlights key outcomes such as improved safety on ice-covered lakes, increased awareness of climate impacts, and strengthened engagement with Indigenous and local knowledge holders.