IMOS - SOOP Ocean Carbon Dioxide Data from RV Southern Surveyor voyage SS2011_V01 (Hobart-Hobart)

This data was collected in April 2011 by the IMOS Ship of Opportunity Underway CO2 Measurement research group on RV Southern Surveyor (IMOS platform code: VLHJ) voyage SS2011_V01.\r\n\r\nDeparted: \tHobart, TAS, Apr 16, 2011\r\nArrived: \tHobart, TAS, Apr 21, 2011\r\n\r\nCO2 System Overview:\r\nThe fugacity of carbon dioxide (fCO2) in surface seawater was measured using a General Oceanics Inc. automated system (Model 8050; Pierrot et al 2009). Seawater is sprayed into an equilibration chamber and CO2 in the headspace gas equilibrates with the seawater. The headspace gas is pumped through a thermoelectric condenser followed by a nafion drying tube before flowing through a Licor 7000 non-dispersive infrared gas analyser used to measure the CO2 mole fraction (XCO2) of the dried air. The gas flow is stopped temporarily for the CO2 measurements, which are made at atmospheric pressure. A set of four CO2 standards that cover the range of CO2 values expected in the ocean are analysed about every four hours to calibrate the gas analyser. The standard gas concentrations are on the WMO-X2007 mole fraction scale for CO2-in-air. Atmospheric XCO2 (dry) is measured after the standards by pumping clean outside air from an intake on the forward mast of the ship. \r\n\r\nSeawater intake and ancillary data:\r\nThe seawater intake is located at about 5.5m depth in the bow of the ship. Sea surface salinity is measured using a thermosalinograph (Seabird Electronics SBE21) located next to the CO2 system. A remote temperature sensor (Seabird Electronics SBE 38) located at the intake is used to measure sea surface temperature (SST). The travel time between the intake and CO2 system is typically about 4 minutes with warming usually less than 0.6ºC. The thermosalinograph water is from the same intake, but the supply lines separate after the intake. A comparison of thermosalinograph and equilibrator temperature records shows the temperature difference in the two lines is generally less than 0.1ºC. The thermosalinograph water line travels outside the ship and is typically warmer than the equilibrator. The travel time in water line to the thermosalinograph is 2.5 minutes faster than to the equilibrator. \r\n\r\nMeteorological data, salinity, SST, and ships position and time are taken from the ships logging system. These parameters and the data quality are maintained by the Australian Marine National Facility.

本数据集由澳大利亚海洋综合观测系统（Integrated Marine Observing System，简称IMOS）机遇科考船走航CO₂测量研究组，于2011年4月在科考船“Southern Surveyor”号（IMOS平台代码：VLHJ）的SS2011_V01航次中采集。

起航：塔斯马尼亚州霍巴特，2011年4月16日
停靠：塔斯马尼亚州霍巴特，2011年4月21日

CO₂系统概况：
海水表层二氧化碳逸度（fCO₂）采用General Oceanics Inc.自动化系统（型号8050；参考Pierrot等2009年文献）进行测量。将海水喷入平衡舱，使顶空气体中的二氧化碳与海水达到气液平衡。顶空气体经热电冷凝器、纳菲昂干燥管处理后，通入Licor 7000型非色散红外气体分析仪，以测量干燥空气的二氧化碳摩尔分数（XCO₂）。测量CO₂时会临时切断气流，所有测量均在常压下进行。每约4小时分析一组覆盖海洋常见CO₂浓度范围的4种CO₂标准气，以校准气体分析仪。标准气的浓度采用WMO-X2007空气CO₂摩尔分数标度。完成标准气校准后，通过安装在船舶前桅杆的进气口抽取清洁外部空气，测量干燥大气的XCO₂浓度。

海水取水与辅助数据：
海水取水口位于船舶船首约5.5米水深处。海表盐度采用安装在CO₂系统旁的Seabird Electronics SBE21型温盐仪进行测量。在取水口处安装Seabird Electronics SBE 38型远程温度传感器，用于测量海表温度（SST）。取水口至CO₂系统的输水行程通常约为4分钟，输水过程中水温升高一般不超过0.6℃。温盐仪的取水水源与CO₂系统相同，但输水管道在取水口处分流。对温盐仪与平衡舱的温度记录进行比对后发现，两条输水管道的水温差通常小于0.1℃。温盐仪的输水管道沿船舶外部铺设，因此水温通常高于平衡舱输水管道。输水至温盐仪的行程比至平衡舱的行程快2.5分钟。

气象数据、盐度、海表温度以及船舶位置与时间信息均来自船舶日志系统。上述参数及数据质量管控由澳大利亚国家海洋设施（Australian Marine National Facility）负责维护。