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Abstract. Sea ice thickness evolution within the Canadian Arctic Archipelago (CAA) isof great interest to science, as well as local communities and their economy.In this study, based on the NEMO numerical framework including the LIM2 seaice module, simulations at both 1∕4 and 1 / 12 ∘ horizontalresolution were conducted from 2002 to 2016. The model captures well thegeneral spatial distribution of ice thickness in the CAA region, with verythick sea ice ( ∼  4 m and thicker) in the northern CAA, thick sea ice( 2.5 to 3  m) in the west-central Parry Channel and M'Clintock Channel,and thin (  m) ice (in winter months) on the east side of CAA (e.g.,eastern Parry Channel, Baffin Island coast) and in the channels in southernareas. Even though the configurations still have resolution limitations inresolving the exact observation sites, simulated ice thickness comparesreasonably (seasonal cycle and amplitudes) with weekly Environment andClimate Change Canada (ECCC) New Ice Thickness Program data at first-yearlandfast ice sites except at the northern sites with high concentration ofold ice. At 1∕4 to 1 / 12 ∘ scale, model resolution does not play asignificant role in the sea ice simulation except to improve local dynamicsbecause of better coastline representation. Sea ice growth is decomposed intothermodynamic and dynamic (including all non-thermodynamic processes in themodel) contributions to study the ice thickness evolution. Relatively smallerthermodynamic contribution to ice growth between December and the followingApril is found in the thick and very thick ice regions, with largercontributions in the thin ice-covered region. No significant trend in wintermaximum ice volume is found in the northern CAA and Baffin Bay while adecline ( r2 ≈ 0.6 , p  ) is simulated in Parry Channelregion. The two main contributors (thermodynamic growth and lateraltransport) have high interannual variabilities which largely balance eachother, so that maximum ice volume can vary interannually by ± 12 % inthe northern CAA, ± 15 % in Parry Channel, and ± 9 % in Baffin Bay. Further quantitative evaluation is required.

Thermodynamic and dynamic ice thickness contributions in the Canadian Arctic Archipelago in NEMO-LIM2 numerical simulations