IMOS - SOOP Ocean Carbon Dioxide Data from RV Southern Surveyor voyage SS072008

This data was collected in may and june 2008 by the IMOS Ship of Opportunity Underway CO2 Measurement research group on RV Southern Surveyor (IMOS platform code: VLHJ) voyage SS072008.\n\nDeparted: \tNoumea, New Caledonia, April 30, 2008\nArrived: \tSuva, Fiji, June 6, 2008\n\nCO2 System Overview:\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. \n\nSeawater intake and ancillary data:\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 0.5ºC. The thermosalinograph water is from the same intake, but the supply lines separate after the intake. The travel time and warming in the two lines is very similar. 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IMOS机遇船舶走航CO₂测量研究小组于2008年5月至6月期间，在研究船“南方考察号”（RV Southern Surveyor，IMOS平台代码：VLHJ）的SS072008航次中采集。

起航地点及时间：新喀里多尼亚努美阿，2008年4月30日
抵达地点及时间：斐济苏瓦，2008年6月6日

CO₂系统概述：
表层海水二氧化碳逸度（fugacity of carbon dioxide, fCO₂）采用General Oceanics公司的自动化系统（型号8050；Pierrot等，2009）进行测量。将海水喷入平衡腔室，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后通过纳菲昂（Nafion）干燥管，随后流入Licor 7000型非分散红外气体分析仪，以测量干燥空气的二氧化碳摩尔分数（XCO₂, CO₂ mole fraction）。测量二氧化碳时会临时切断气流，所有测量均在大气压下进行。每约4小时便会分析一组覆盖海洋环境中预期二氧化碳浓度范围的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空气二氧化碳摩尔分数尺度。完成标准气体分析后，通过安装在船舶前桅的进气口抽取洁净外部空气，以测量干燥大气中的XCO₂。

海水采样及辅助数据：
海水采样口位于船舶船艏约5.5米水深处。海面盐度采用位于CO₂系统旁的海鸟电子（Seabird Electronics）SBE21型温盐计进行测量。采样口处安装的海鸟电子（Seabird Electronics）SBE 38型远程温度传感器，用于测量海面温度（Sea Surface Temperature, SST）。从采样口到CO₂系统的输水耗时通常约为4分钟，输水过程中的水温升高通常小于0.5℃。温盐计的取水同样来自该采样口，但输水管道在采样口处分流。两条输水管道的输水耗时与水温升高情况基本一致。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均由澳大利亚国家海洋科研设施（Australian Marine National Facility）负责维护。