IMOS - SOOP Ocean Carbon Dioxide Data from RV Southern Surveyor voyage ST032008

This data was collected in August 2008 by the IMOS Ship of Opportunity Underway CO2 Measurement research group on RV Southern Surveyor (IMOS platform code: VLHJ) voyage ST032008.\n\nDeparted: \tGladstone, Queensland, August 12, 2008\nArrived: \tSydney, New South Wales, August 16, 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 0.6ºC. 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. \n\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IMOS机会船航行中CO₂测量研究小组于2008年8月在“南方测量者号”考察船（RV Southern Surveyor，IMOS平台代码：VLHJ）ST032008航次期间采集。

出发地： 昆士兰州格拉德斯通，2008年8月12日
到达地： 新南威尔士州悉尼，2008年8月16日

CO₂系统概述：
表层海水的二氧化碳逸度（fugacity of carbon dioxide，fCO₂）采用General Oceanics Inc.的自动化系统（型号8050；Pierrot等人，2009）进行测量。海水被喷入平衡室，顶空气体中的CO₂与海水达到平衡。顶空气体经热电冷凝器后进入全氟磺酸干燥管，干燥后的气体流经Licor 7000非色散红外气体分析仪，以测量其CO₂摩尔分数（mole fraction of CO₂，XCO₂）。CO₂测量时气体流动暂时停止，测量在大气压下进行。每隔约4小时分析一组4种CO₂标准气体（覆盖海洋中预期的CO₂值范围），以校准气体分析仪。标准气体浓度基于WMO-X2007大气CO₂摩尔分数标度。大气XCO₂（干燥）通过船舶前桅杆进气口抽取清洁外部空气进行测量，测量在标准气体分析后进行。

海水取水口及辅助数据：
海水取水口位于船首约5.5米深度处。表层海水盐度通过CO₂系统旁的温盐仪（thermosalinograph，Seabird Electronics SBE21）测量。取水口处的远程温度传感器（Seabird Electronics SBE38）用于测量海表温度（sea surface temperature，SST）。取水口到CO₂系统的水流时间通常约为4分钟，水温升高通常小于0.6℃。温盐仪用水来自同一取水口，但供水管道在取水口后分开。温盐仪与平衡室温度记录的对比显示，两条管道中的温度差通常小于0.1℃。温盐仪的水管路位于船外，通常比平衡室的管路更暖。水流至温盐仪的时间比至平衡室快2.5分钟。

气象数据、盐度、SST、船舶位置和时间均取自船舶日志系统。这些参数及数据质量由澳大利亚海洋国家设施（Australian Marine National Facility）维护。