Studies since AR5 have confirmed ongoing and accelerating loss of lake and river ice in the Northern Hemisphere  . In recent decades, systems have been freezing later in winter and thawing earlier in spring, reducing ice duration by >2 weeks per year and leading to an increasing numbers of years with a loss of perennial ice cover, intermittent ice cover or even an absence of ice . The global extent of river ice declined by 25% between 1984 and 2018 . This trend has been more pronounced at higher latitudes, consistent with enhanced polar warming  . Empirical long-term and remote-sensing data gathered in an increasingly large number of freshwater systems supports very high confidence in attributing these trends to climate
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report