RV Investigator Voyage IN2023_V05 CTD Data

This record describes the CTD data collected on Investigator voyage IN2023_V05, titled: "Untangling the causes of change over 25 years in the southeast marine ecosystem (SEA-MES Voyage 1)." The voyage took place between June 27, 2023 and July 29, 2023 (AEST), departing from Hobart and returning to Hobart. Data for 62 CTD deployments were acquired using the Sea-Bird SBE9+V2 CTD unit #24 (S/N 1332), fitted with 36 twelve-litre bottles on the rosette sampler. Sea-Bird-supplied calibration factors were used to compute the pressures and preliminary conductivity values. CSIRO-supplied calibrations were applied to the temperature data. The data were subjected to automated QC to remove spikesand out-of-range values.The initial configuration of the CTD for casts #1-22 is shown in table 1 below. For casts #23-62 , the CDOM sensor on channel A4 was replaced by the Chelsea Aquatracka fluorometer (as indicated in table 1 below) due to suspiciously high readings obtained using the Wetlabs FLBBRTD fluorometer near the water surface. The Chelsea unit yielded a similar response, providing confidence that theunexpectedly high chlorophyll readings near the surface were not caused by sensor issues.The final conductivity calibration was based on a single deployment grouping. The final calibration from the secondary sensor had a standard deviation (SD) of 0.0013744 PSU, well within our target of ‘better than 0.002 PSU’. The standard product of 1-decibar binned averages were produced using data from the secondary sensors.The dissolved oxygen data (primary) calibration fit had a SD of 0.7868 μM. The agreement between the CTD and bottle data was good.Additional sensors include: SUNA Nitrate, Altimeter (Tritech PA500), Transmissometer (Wetlabs CStar), CDOM (replaced by Chealsea Aquatracka after cast #22), Chlorophyll-a, Scattering (Wetlabs ECO FLCDRTD) were installed on the auxiliary A/D channels of the CTD.The collected data were processed (quality-controlled), and subsequently archived by the CSIRO National Collections and Marine Infrastructure (NCMI) Information and Data Centre (IDC).Additional information regarding this dataset may be contained in the Voyage Summary and the Data Processing Report.

本记录描述了“探索者”号科考船航次IN2023_V05采集的温盐深剖面仪（Conductivity, Temperature, Depth, CTD）数据，该航次标题为“解析东南海洋生态系统25年变化的成因（SEA-MES航次1）”。本航次于2023年6月27日至2023年7月29日（澳大利亚东部标准时间，AEST）执行，从霍巴特起航并返回霍巴特。本航次共完成62次CTD投放，所用设备为Sea-Bird SBE9+V2型CTD单元#24（序列号S/N 1332），其配套采水罗盘搭载了36个12升采水瓶。本次数据处理采用Sea-Bird公司提供的校准因子计算压力与初始电导率值，温度数据则使用澳大利亚联邦科学与工业研究组织（Commonwealth Scientific and Industrial Research Organisation, CSIRO）提供的校准参数进行校正。所有数据已通过自动化质量控制（Quality Control, QC）流程，以剔除异常尖峰与超出量程的数据。1-22号站位的CTD初始配置详见下表1。对于23-62号站位，由于在近水面使用Wetlabs FLBBRTD型荧光计时获得了异常偏高的读数，因此将A4通道的有色溶解有机物（Colored Dissolved Organic Matter, CDOM）传感器更换为Chelsea Aquatracka型荧光计（详见下表1）。后续验证表明，Chelsea设备的响应结果一致，确认近水面异常偏高的叶绿素读数并非传感器故障所致。最终电导率校准基于单次投放组进行，二级传感器的最终校准结果的标准偏差（Standard Deviation, SD）为0.0013744实用盐度单位（Practical Salinity Unit, PSU），远优于我们设定的“优于0.002 PSU”的目标。我们基于二级传感器的数据生成了1分巴（decibar）分箱平均的标准产品数据。溶解氧主传感器的校准拟合结果的标准偏差为0.7868 μM，CTD数据与采水瓶数据的吻合度良好。本次航次额外搭载的传感器包括：SUNA型硝酸盐传感器、Tritech PA500型高度计、Wetlabs CStar型透射计、CDOM传感器（22号站位后更换为Chelsea Aquatracka型荧光计）、叶绿素-a传感器以及Wetlabs ECO FLCDRTD型散射计，上述传感器均安装于CTD的辅助模数（Analog-to-Digital, A/D）通道。本次采集的数据已完成处理（含质量控制），并由CSIRO国家海洋数据与基础设施信息数据中心（National Collections and Marine Infrastructure, NCMI Information and Data Centre, IDC）归档存储。有关本数据集的更多信息可参见航次总结报告与数据处理报告。