Data dictionary for QuadraBoL data files submitted to SOCAT (1) Yearday: numeral day of the year (2) Year: calendar year (3) Matlab Serial Date Number (days since Jan 1 0000): serial date number in Matlab format (4) Excel Serial Date Number (days since Jan 1 1990): serial date number in Excel format (5) TSG-T (deg C): SBE 45 TSG seawater temperature in degrees C (6) TSG-S (PSS-78): SBE 45 TSG seawater salinity in Practical Salinity Units (7) corrected xCO2 (ppm): corrected SW CO2 mole fractions in wet air (ppm) (8) equilibrator pressure (kPa): total pressure of equilibration (equilibrator differential pressure + LI840 cell pressure; kPa) (9) SWpCO2@TSG_T (uatm) (10) SWfCO2@TSG_T (uatm) (11) SBE56_T (deg C) (12) DiverCTD8975_Pressure (standard atm pressure removed, mbar) (13) DiverCTD8975_T (deg C) (14) DiverCTD8975_S (PSS-78) (15) DiverCTD8967_Pressure (standard atm pressure removed, mbar) (16) DiverCTD8967_T (deg C) (17) DiverCTD8975_S (PSS-78) (18) SBE 37 T (deg C) (19) SBE 37 S (PSS-78) (20) SST (TSG-T minus mean delta-T) (21) SWpCO2@SST (uatm): SW CO2 partial pressure in wet air (uatm) (22) SWfCO2@SST (uatm): SW CO2 fugacity in wet air (uatm) (23) TA (umol/kg; from Evans et al., 2019 relationship) (24) TCO2 (umol/kg; Waters et al constants) (25) pH_T (total scale; Waters et al constants) (26) Omega_arag (Waters et al constants) (27) Omega_calc (Waters et al constants) (28) Revelle factor (Waters et al constants) (29) Date and Time: in GMT yyyy-mm-dd hh:mm:ss (30) Latitude (deg N): degrees north (31) Longitude (deg W): degrees west