Dissolved inorganic carbon (DIC), total alkalinity (TA), pH, discrete pCO2, methane, nutrients, dissolved oxygen, water temperature, salinity and other measurements collected from discrete samples and profile observations via opportunistic sampling on the United Nations Convention on the Law of the Sea (UNCLOS) CCGS Louis S. St-Laurent cruises 2014-10, 2015-05, and 2016-15 by Natural Resources of Canada (NRCan) in the Arctic Ocean, Beaufort Sea and Canada Basin from 2014-08-28 to 2016-09-13 (NCEI Accession 0240685)