IMOS - Ships of Opportunity - Ocean Carbon Dioxide Data from RV Aurora Australis voyage AA1213V3 (Hobart-Hobart)

This data was collected in January - February 2013 by the IMOS Ship of Opportunity Underway CO2 Measurement research group on RV Aurora Australis (IMOS platform code: VNAA) voyage AA1213V3.Departed:     Hobart, Tasmania, January 13, 2013Arrived: Hobart, Tasmania, February 22, 2013CO2 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 three hours to calibrate the gas analyser. 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 at about 6 m depth. A remote temperature sensor (Seabird Electronics SBE38) located at the intake is used to measure sea surface temperature (SST). Sea surface salinity is measured using a thermosalinograph (Seabird Electronics SBE21) mounted in the oceanographic lab next to the pCO2 system. The travel time between the intake and CO2 system is typically about 70 seconds with warming usually less than 0.7ºC in cold waters near freezing. The thermosalinograph water is from the same intake and supply line. Meteorological data, salinity, SST, and ships position and time are taken from the ship’s logging system.

本数据由IMOS机会船航行中CO₂测量研究组于2013年1月至2月在极光号考察船（RV Aurora Australis，IMOS平台代码：VNAA）AA1213V3航次期间采集。
出发地：塔斯马尼亚州霍巴特，2013年1月13日
到达地：塔斯马尼亚州霍巴特，2013年2月22日

CO₂系统概述：
表层海水中二氧化碳的逸度（fCO₂）采用General Oceanics Inc.的自动化系统（型号8050；Pierrot等，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，再通过Nafion干燥管，随后流经Licor 7000非分散红外气体分析仪，用于测量干燥空气中CO₂的摩尔分数（XCO₂）。测量CO₂时气体流动暂时停止，测量在大气压下进行。每约三小时分析一组涵盖海洋中预期CO₂值范围的四种CO₂标准气体，以校准气体分析仪。标准气体分析后，通过抽取船前桅杆进气口的洁净室外空气来测量大气XCO₂（干燥）。

海水取水口及辅助数据：
海水取水口深度约为6米。取水口处安装有远程温度传感器（Seabird Electronics SBE38），用于测量海表温度（SST）。海表盐度采用安装在海洋学实验室中pCO₂系统旁的温盐仪（Seabird Electronics SBE21）测量。取水口到CO₂系统的传输时间通常约为70秒，在接近冰点的冷水域中，水温升高通常小于0.7℃。温盐仪所用海水来自同一取水口和供应管线。气象数据、盐度、海表温度以及船位和时间均取自船舶的日志系统。