RV Investigator Voyage IN2018_V02 CTD Data

This record describes the Conductivity-Temperature-Depth (CTD) data collected from the Marine National Facility RV Investigator voyage IN2018_V02, titled: "SOTS: Southern Ocean Time Series automated moorings for climate and carbon cycle studies south west Tasmania; Subantarctic Biogeochemistry of Carbon and Iron." The voyage took place between March 3 and March 21, 2018 departing from Hobart (TAS) and arriving in Hobart.

Data for 7 deployments were acquired using the Seabird SBE911 CTD unit 24, fitted with 36 twelve litre bottles on the rosette sampler. Samples were collected on casts 2-6. 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 spikes and out-of-range values.

The final conductivity calibration for each deployment was calculated using the sensors with the lowest residuals when compared with the values measured by the hydrochemistry team. The final calibration from chosen sensors all had a standard deviation (S.D) less than our target of ‘better than 0.002 PSU’. The standard product of 1dbar binned averaged were produced using data from the primary conductivity and temperature sensors and the secondary oxygen sensor.

The dissolved oxygen data calibration generally showed a good agreement between the CTD and bottle data.

A Biospherical photosynthetically active radiation (PAR), Wetlabs transmissometer, Chelsea fluorometer and the Wetlabs ECO chlorophyll and Eco-scattering sensors were also installed on the auxiliary A/D channels of the CTD. An IMU and LADCP unit was also attached to the rosette for all casts.

The collected data were subsequently processed and archived within the CSIRO Oceans and Atmosphere (O&A) Information and Data Centre (IDC) in Hobart. Additional information regarding this dataset may be contained in the Voyage Summary and the CTD Data Processing Report.

本记录描述了国家海洋设施“调查者号”科考船IN2018_V02航次采集的温盐深（CTD）数据，该航次标题为：“SOTS：南大洋时间序列自动锚系——塔斯马尼亚西南部气候与碳循环研究；亚南极碳与铁生物地球化学”。航次于2018年3月3日至3月21日进行，从霍巴特（塔斯马尼亚州）出发并返回霍巴特。

通过配备36个12升采样瓶的多瓶采样器，使用Seabird SBE911 CTD单元24完成了7次布放的数据采集。样本在第2至6次投放中采集。利用Sea-Bird提供的校准因子计算压力与初步电导率值，温度数据则采用CSIRO提供的校准方法。数据经过自动质量控制（QC）以去除尖峰信号与超出范围的值。

每次布放的最终电导率校准通过与水化学团队测量值对比、选择残差最低的传感器计算得出。所选传感器的最终校准结果标准差（S.D）均低于“优于0.002实用盐度单位（PSU）”的目标值。利用主电导率、温度传感器及副溶解氧传感器的数据，生成了1分巴区间平均的标准产品。

溶解氧数据校准结果显示，CTD数据与瓶样数据间总体一致性良好。

CTD的辅助模数转换（A/D）通道还安装了Biospherical光合有效辐射（PAR）传感器、Wetlabs透射仪、Chelsea荧光仪及Wetlabs ECO叶绿素与Eco散射传感器。所有投放中，多瓶采样器均附带惯性测量单元（IMU）与下拉式声学多普勒流速剖面仪（LADCP）单元。

采集的数据随后在霍巴特的CSIRO海洋与大气（O&A）信息与数据中心（IDC）进行处理与归档。关于本数据集的更多信息可参见航行总结与CTD数据处理报告。