Abstract Quantifying Arctic Ocean mixing is important for understanding the Arctic climate system. Direct mixing measurements cannot robustly characterize mixing on a pan‐Arctic scale, while indirect estimates based on parameterizations must be made with care; multiple mixing mechanisms including double diffusion, internal wave breaking and molecular mixing must be independently considered. In this work, we use observations from Ice‐Tethered Profilers and ship‐based measurements to: (a) Characterize the prevalence of select mixing regimes in the Atlantic Water thermocline across the Arctic Ocean; (b) Provide statistical descriptions of sector‐ and regime‐specific estimates of heat and buoyancy fluxes and implied diffusivities based on regime‐specific parameterizations; and (c) Quantify the relative contribution of select mixing regimes to net heat and buoyancy transports. Results detail important geographical differences in mixing regime prevalence and the significance of regime relative contributions that can provide useful insight into differing controls on stratification and the fate of Atlantic Water heat.