Surface underway measurements of partial pressure of carbon dioxide (pCO2), sea surface temperature, sea surface salinity and other parameters from Autonomous Surface Vehicle ASV_Saildrone1021_GulfStream (EXPOCODE 32DB20190130) in the North Atlantic Ocean from 2019-01-30 to 2019-02-21 (NCEI Accession 0209698)

This dataset includes surface chemical, meteorological and physical data collected from Autonomous Surface Vehicle ASV_Saildrone1021_GulfStream (EXPOCODE 32DB20190130) in the North Atlantic Ocean from 2019-01-30 to 2019-02-21. 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 from airblock, 2 feet above the sea surface at measured humidity; H2O Air - mole fraction of H2O in air from airblock, 2 feet above the sea surface; atmospheric pressure at the airblock, 2 feet above the sea surface; temperature of the Infrared Licor 820 in degrees Celsius; MAPCO2 %O2 - the percent oxygen of the surface seawater divided by the percent oxygen of the atmosphere at 2 feet above the sea surface; 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 at the airblock, 2 feet above the sea surface (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 at the airblock, 2 feet above the sea surface (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 at the airblock, 2 feet above the sea surface (100% humidity); dpCO2 - difference of the partial pressure of CO2 in seawater and air (pCO2 SW - pCO2 Air and pH of seawater (on total scale). The Autonomous Surface Vehicle CO2 (ASVCO2) instruments used to collect these data include Bubble type equilibrator for autonomous carbon dioxide (CO2) measurement, Carbon dioxide (CO2) gas analyzer, Humidity Sensor, and oxygen meter.

本数据集涵盖2019年1月30日至2019年2月21日期间，于北大西洋海域由自主水面航行器（Autonomous Surface Vehicle, ASV）Saildrone1021_GulfStream（航次代码EXPOCODE 32DB20190130）采集的表层化学、气象与物理观测数据。本次采集的数据包括：湿态海水平衡气CO₂摩尔分数（xCO₂ SW (wet)）——即与表层海水在表层水温及实测湿度下达到平衡的空气中CO₂摩尔分数；海水平衡水汽摩尔分数（H₂O SW）——来自平衡器的空气中水汽摩尔分数；湿态大气CO₂摩尔分数（xCO₂ Air (wet)）——海面上方2英尺处气块的湿态空气中CO₂摩尔分数（已校正实测湿度）；大气水汽摩尔分数（H₂O Air）——海面上方2英尺处气块的空气中水汽摩尔分数；海面上方2英尺处气块的大气压强；红外Licor 820传感器温度（单位：摄氏度）；MAPCO2 %O2——表层海水溶解氧百分比与海面上方2英尺处大气氧百分比的比值；海表温度（SST, Sea Surface Temperature）；海表盐度（SSS, Sea Surface Salinity）；干空气条件下海水平衡气CO₂摩尔分数（xCO₂ SW (dry)）——校正至表层水温、干空气状态下与海水平衡的空气中CO₂摩尔分数；干空气条件下大气CO₂摩尔分数（xCO₂ Air (dry)）——海面上方2英尺处气块、干空气状态下的空气中CO₂摩尔分数；饱和条件下海水平衡气CO₂逸度（fCO₂ SW (sat)）——表层水温、100%湿度下与海水平衡的空气中CO₂逸度；饱和条件下大气CO₂逸度（fCO₂ Air (sat)）——海面上方2英尺处气块、100%湿度下空气中的CO₂逸度；CO₂逸度差（dfCO2）——海水与空气中CO₂逸度的差值（fCO₂ SW - fCO₂ Air）；湿态海水平衡气CO₂分压（pCO₂ SW (wet)）——表层水温、100%湿度下与海水平衡的空气中CO₂分压；湿态大气CO₂分压（pCO₂ Air (wet)）——海面上方2英尺处气块、100%湿度下空气中的CO₂分压；CO₂分压差（dpCO2）——海水与空气中CO₂分压的差值（pCO₂ SW - pCO₂ Air），以及总标度海水pH值。本数据集所使用的自主水面航行器CO₂（ASVCO2）观测系统包含：用于自主二氧化碳（CO₂）测量的气泡式平衡器、二氧化碳（CO₂）气体分析仪、湿度传感器与溶氧仪。