IMOS - Ships of Opportunity - Ocean Carbon Dioxide Data from RV Southern Surveyor voyage SS2010_V09 (Sydney-Sydney)

This data was collected in October 2010 by the IMOS Ship of Opportunity Underway CO2 Measurement research group on RV Southern Surveyor (IMOS platform code: VLHJ) voyage SS2010_V09.Departed:     Sydney, NSW, Oct 14, 2010Arrived:     Sydney, NSW, Oct 31, 2010CO2 System Overview:The 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. Seawater intake and ancillary data:The 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. Meteorological 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.

本数据集由集成海洋观测系统（Integrated Marine Observing System, IMOS）的“机遇船走航CO₂测量”研究小组，在“南方考察者号”（RV Southern Surveyor，IMOS平台代码：VLHJ）的SS2010_V09航次中采集。
起航地：新南威尔士州悉尼，2010年10月14日
到达地：新南威尔士州悉尼，2010年10月31日

CO₂系统概述：表层海水二氧化碳逸度（fCO₂）采用通用海洋科学公司（General Oceanics Inc.）的自动化系统（型号8050；Pierrot等，2009）进行测定。将海水喷入平衡腔，顶空气体中的二氧化碳与海水达成气液平衡。顶空气体经热电冷凝器、纳菲昂干燥管后，流入LI-COR 7000型非色散红外气体分析仪，以测定干燥空气的CO₂摩尔分数（XCO₂）。CO₂测量于常压下进行，测量期间会暂时中断气流。每约4小时会分析一组覆盖海洋中预期CO₂浓度范围的4种CO₂标准气体，以对气体分析仪进行校准。标准气体的浓度采用WMO-X2007空气中CO₂摩尔分数标度。标准气体分析完成后，通过安装在船舶前桅的进气口抽取洁净外部空气，以测定干燥大气中的XCO₂。

海水取水口及辅助数据：海水取水口位于船舶船首约5.5米水深处。海水表面盐度采用安装于CO₂系统旁的海鸟电子（Seabird Electronics）SBE21型温盐仪进行测定。安装于取水口处的海鸟电子SBE 38型远程温度传感器，用于测定海水表面温度（SST）。取水口至CO₂系统的输水行程通常约为4分钟，水温升高通常低于0.6℃。温盐仪的取水水源与CO₂系统一致，但输水管道在取水口处分流。对温盐仪与平衡腔的温度记录进行比对后发现，两条输水管道的水温差通常低于0.1℃。温盐仪的输水管道沿船舶外壁布设，水温通常高于平衡腔侧的管道。输水管道至温盐仪的行程比至平衡腔的行程快2.5分钟。气象数据、盐度、SST以及船舶位置与时间信息均取自船舶日志系统。上述参数及数据质量由澳大利亚国家海洋设施负责维护。