This dataset includes CTD measurements (temperature, salinity, and seawater pressure) as well as measurements of various biogeochemical parameters (oxygen, nutrients, chlorophyll-a fluorescence, fluorescence of CDOM), and measurements of the seawater carbonate system (dissolved inorganic carbon and total alkalinity). Sampling locations are scattered throughout eastern Canadian Arctic waters, including Baffin Bay, Nares Strait, Lancaster Sound, Barrow Strait, and Coronation Gulf.