Surface underway measurements of partial pressure of carbon dioxide (pCO2), sea surface temperature, sea surface salinity and other parameters from Autonomous Surface Vehicle ASV_Saildrone1020 (EXPOCODE 32DB20190119) in the South Atlantic Ocean, South Pacific Ocean, Indian Ocean and Southern Ocean from 2019-01-19 to 2019-08-03 (NCEI Accession 0221912)

These data include xCO2 SW (wet) - mole fraction of CO2 in air in equilibrium with the seawater at sea surface temperature and measured humidity; H2O SW - mole fraction of H2O in air from equilibrator; xCO2 Air (wet) - mole fraction of CO2 in air at measured humidity; H2O Air - mole fraction of H2O in air; barometric pressure; MAPCO2 %O2 - the percent oxygen of the surface seawater divided by the percent oxygen of the atmosphere; SST - sea surface temperature; SSS - sea surface salinity; xCO2 SW (dry) - mole fraction of CO2 in air in equilibrium with the seawater at sea surface temperature (dry air); xCO2 Air (dry) - mole fraction of CO2 in air (dry air); fCO2 SW (sat) - fugacity of CO2 in air in equilibrium with the seawater at sea surface temperature (100% humidity); fCO2 Air (sat) - fugacity of CO2 in air (100% humidity); dfCO2 - difference of the fugacity of the CO2 in seawater and the fugacity of the CO2 in air (fCO2 SW - fCO2 Air); pCO2 SW (wet) - partial pressure of CO2 in air in equilibrium with the seawater at sea surface temperature (100% humidity); pCO2 Air (wet) - partial pressure of CO2 in air (100% humidity); dpCO2 - difference of the partial pressure of CO2 in seawater and air (pCO2 SW - pCO2 Air) and Wind speed at the anemometer.

The instruments used to collect these data include bubble type equilibrator for autonomous carbon dioxide (CO2) measurement, carbon dioxide (CO2) gas analyzer, humidity sensor, oxygen meter and thermosalinographs.