GO-SHIP A16N 2023 Leg 2: NOAA quality control and data analysis report for the inorganic carbon parameters

The Global Ocean Ship-Based Hydrographic Investigations Program (GO-SHIP) A16N Leg 2 2023 cruise took place onboard the NOAA Ship Ronald H. Brown from April 13 to May 9, 2023, traveling between Rota, Spain and Reykjavik, Iceland. This technical report documents and details the quality control (QC) procedures and data analyses of the inorganic carbon parameter measurements (total alkalinity, TA (µmol kg–1 ); total dissolved inorganic carbon, DIC (µmol kg–1 ); pH on the total scale at 25 °C, pHT(25); and fugacity of CO2 at 20 °C, fCO2(20) (µatm)) from 75 conductivity/temperature/depth (CTD) stations. After preliminary QC analyses at sea, secondary QC analyses and internal consistency assessments were conducted in this report as a means to standardize the QC protocols and ensure a fully consistent data set for all four inorganic carbon parameters. Analyses highlight that the inorganic carbon measurements for the A16N Leg 2 2023 cruise follow best-practice measurement protocols. Grant no. NA20OAR4320472