| Summary: | This data set describes geochemical data collected from 53 rivers, lakes, and glaciers throughout the Canadian Arctic Archipelago (CAA) and Hudson Bay. CAA rivers were sampled through access either (i) on foot from nearby communities; (ii) by small local boats; (iii) via float planes or helicopters; (iv) and/or aboard larger marine vessels, including: the RV Martin Bergmann as part of the Canadian Arctic Archipelago Rivers Program (CAA-RP; 2016 – 2019); aboard the CCGS Amundsen as part of the ArcticNet / Amundsen Science biogeochemical surveys (2017-2019); and aboard the MV Polar Prince as part of the Canada 150 C3 Expedition (2017). Hudson Bay rivers were sampled from the CCGS Amundsen as part of the BaySys project (2018). Time series observations were collected from the Coppermine River in Kugluktuk, Nunavut (NU) (year-round; Sept 14, 2016 to Sept 17, 2018), and from Freshwater Creek in Cambridge Bay, NU (open water only; June 8, 2017 to Aug 23, 2019). Water samples were collected according to methods developed by the Arctic Great Rivers Observatory (http://www.arcticgreatrivers.org/), described in detail in Brown et al., 2020. Briefly, water was collected at each site using pre-rinsed 60 mL syringes (Fisher Scientific) either by filling the syringe (1) directly from just below the surface of the river; or, (2) with the aid of a Niskin bottle deployed just below the surface; (3) using a submersible or peristaltic pump and tubing fastened to a pole; or (4) after collecting a bulk water sample by pump (as in 3) into a clean 500 mL glass bottle, stored in coolers in the dark, and then subsampling immediately after returning to the ship. Water collected for geochemical analyses of dissolved constituents was filtered through 0.22 μm Sterivex cartridges (Millipore) into triply rinsed glass or HDPE plastic vials. Vials used for the determination of Dissolved Organic Carbon (DOC) and Nutrients (Nitrate + Nitrite, Phosphate, Silicate) were acid cleaned prior to use. Samples for the determination of DOC and Nutrients ...
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