Dataset: Discrete sample measurements of dissolved oxygen, dissolved inorganic carbon, and total alkalinity from US Overturning in the Subpolar North Atlantic Program (OSNAP) cruises in 2020 and 2022 (AR45 and AR69-03)

These samples were during cruises onboard the R/V Neil Armstrong to recover and redeploy mooring infrastructure of the international Overturning in the Subpolar North Atlantic Program (OSNAP) in 2020 (AR45) and 2022 (AR69-03). The mooring infrastructure maintained on these cruises is located in the eastern Labrador Sea (referred to as the LS line) and western Irminger Sea (referred to as the CF line). Beginning in 2020, the Gases in the Overturning and Horizontal circulation of the Subpolar North Atlantic Program (GOHSNAP) has added moored oxygen sensors to these sections of the OSNAP mooring array. During these cruises, Conductivity Temperature Depth (CTD) casts are conducted to provide data necessary to calibrate the moored sensors (Miller et al., in review), as well as hydrographic data that provide a valuable dataset in and of themselves.

This dataset contains dissolved oxygen, dissolved inorganic carbon (DIC), and total alkalinity (TA) measurements from discrete water samples collected from Niskin bottles on the CTD rosette. Additional context about the cruises and all cruise operations can be found in the cruise reports for AR45 (2020) and AR69-03 (2022). We note that the 2020 cruise was conducted in the context of operational and cruise staffing limitations imposed by the COVID-19 pandemic, which is reflected in the lower number of discrete samples collected and in modifications to the procedure for dissolved oxygen sample analysis.