Data dictionary for seaspan_royal_pCO2_jul_oct.csv, seaspan_royal_pCO2_nov.csv, seaspan_royal_pCO2_dec.csv 

(1)Date and Time (yyyy-mm-dd hh:mm:ss): GMT date and time in yyyy-mm-dd hh:mm:ss	

(2)Excel Date Number: GMT date and time in Excel number format	

(3)Matlab Date Number: GMT date and time in Matlab number format		

(4)Latitude: GPS latitude	

(5)Longitude: GPS longitude	

(6)Atmospheric Pressure (atm): atmospheric pressure from the ship Airmar 120WX above the bridge	

(7)Air Temperature (degrees C): air temperature from the ship Airmar 120WX above the bridge 	

(8)Relative Humidity (percent): relative humidity from the ship Airmar 120WX above the bridge

(9)Wind Speed (m/s): wind speed from the ship Airmar 120WX above the bridge and corrected for ship motion	

(10)Wind Direction (degrees): wind direction from the ship Airmar 120WX above the bridge and corrected for ship motion	 	

(11)Raw xCO2 Wet (ppm): raw CO2 mole fractions in wet air	

(12)H2O (ppt): water vapour concentration in mmol/mol

(13)Cell Temperature (degrees C): LI-850 cell temperature in degrees C	

(14)Cell Pressure (kPa): LI-850 cell pressure in kPa	

(15)Equilibrator Temperature (degrees C): Temperature measured in the equilibrator using a Fluke thermometer (model 1523) with thermistor probe (model 5610) and reported in degrees C with a 0.01 degree C uncertainty	

(16)Equilibrator Pressure (kPa): Differential pressure measured in the equilibrator using a Setra pressure transducer (model 239) with a 0.15 hPa uncertainty	

(17)SBE63 Temperature (degrees C): thermistor temperature from the SBE63 oxygen optode	

(18)SBE63 Raw O2 (ml/l): raw oxygen in ml/l measured by the SBE63 oxygen optode	

(19)SBE63 Phase Delay (micro-seconds): raw phase delay in micro-seconds from the SBE63 oxygen optode	

(20)SBE63 Thermistor Voltage (volts): raw thermistor voltage in volts from the SBE63 oxygen optode	

(21)Valve position (1 = SW, 2 = ATM): SuperCO2 system valve position where 1 = seawater measurement and 2 = atmospheric CO2 measurement	

(22)SBE45 TSG temperature (degrees C): Temperature measured by the SBE45 thermosalinograph reported in degrees C	

(23)SBE45 TSG Conductivity (S/m): Conductivity measured by the SBE45 thermosalinograph reported in S/m		

(24)SBE45 TSG Salinity (PSU): Salinity from the SBE45 thermosalinograph reported in PSU and derived from TSG conductivity and temperature		
(25)SBE38 Intake Temperature (degrees C):  Intake temperature from the SBE38 Digital Oceanographic Thermometer	

(26)Calibrated xCO2 wet (ppm): calibrated CO2 mole fractions in wet air	

(27)total pressure (atm + equilibrator; atm): total pressure in the equilibrator (differential pressure plus atmospheric pressure) in atm	

(28)ATM pCO2 (micro-atm): atmospheric pCO2 in micro-atmospheres	

(29)SW pCO2@equilibrator_T (micro-atm): seawater pCO2 in micro-atmospheres and relative to the equilibrator temperature	

(30)SW pCO2@intake_T (micro-atm): seawater pCO2 in micro-atmospheres and adjusted to the intake temperature	

(31)salt corrected O2 (ml/l): salt corrected oxygen in ml/l	

(32)ATM fCO2 (micro-atm): atmospheric CO2 fugacity in micro-atmospheres	

(33)SW fCO2@intake_T (micro-atm): seawater CO2 fugacity in micro-atmospheres