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Observed and modelled landfast ice thickness variability and trends spanningmore than 5 decades within the Canadian Arctic Archipelago (CAA) aresummarized. The observed sites (Cambridge Bay, Resolute, Eureka and Alert)represent some of the Arctic's longest records of landfast ice thickness.Observed end-of-winter (maximum) trends of landfast ice thickness(1957–2014) were statistically significant at Cambridge Bay (−4.31 ± 1.4 cm decade−1), Eureka (−4.65 ± 1.7 cm decade−1) and Alert (−4.44  ± 1.6 cm −1) but not at Resolute. Over the 50+-yearrecord, the ice thinned by  ∼ 0.24–0.26 m at Cambridge Bay,Eureka and Alert with essentially negligible change at Resolute. Althoughstatistically significant warming in spring and fall was present at allsites, only low correlations between temperature and maximum ice thicknesswere present; snow depth was found to be more strongly associated with thenegative ice thickness trends. Comparison with multi-model simulations fromCoupled Model Intercomparison project phase 5 (CMIP5), Ocean ReanalysisIntercomparison (ORA-IP) and Pan-Arctic Ice-Ocean Modeling and AssimilationSystem (PIOMAS) show that although a subset of current generation models havea "reasonable" climatological representation of landfast ice thickness anddistribution within the CAA, trends are unrealistic and far exceedobservations by up to 2 orders of magnitude. ORA-IP models were found tohave positive correlations between temperature and ice thickness over theCAA, a feature that is inconsistent with both observations and coupled modelsfrom CMIP5

Landfast ice thickness in the Canadian Arctic Archipelago from observations and models