RV Investigator Voyage IN2018_V01 ADCP Data

This record describes the Acoustic Doppler Current Profiler (ADCP) data collected from the Marine National Facility RV Investigator voyage IN2018_V01, titled: "Detecting Southern Ocean change from repeat hydrography, deep Argo and trace element biogeochemistry & CAPRICORN." The voyage took place between the January 11 and February 22, 2018 departing Hobart (TAS) and returning to Hobart.

Only the RDI Ocean Surveyor 75kHz ADCP was operational during this voyage. The RDI Ocean Surveyor 150kHz ADCP was not operated due to a hardware fault, so all data was collected with the RDI Ocean Surveyor 75kHz ADCP, which was run in narrow band mode only.
The first four days of the voyage had a degraded seapath data feed to UHDAS. It appeared that the seapath D-GPS had been working in GNSS mode and not DGNSS. These issues were addressed by a reconfiguration of UHDAS to get a better heading calibration for the first part of the voyage and a subsequent part2 of the voyage was created.
Internal triggering was used as the focus of this voyage was to collect current data and external triggering was found to be unstable on previous voyages.
Port drop keel was flush with gondola for the majority of the voyage at 2m in the period between 2018-01-11T21:00:20Z and 2018-02-21T20:55:30Z.

This dataset was processed and then archived within the CSIRO Oceans and Atmosphere (O&A) Information and Data Centre (IDC) in Hobart.

本记录描述了澳大利亚海洋国家设施“调查员号”（RV Investigator）航次IN2018_V01采集的声学多普勒流速剖面仪（Acoustic Doppler Current Profiler, ADCP）数据，该航次主题为“基于重复水文观测、深层Argo与痕量元素生物地球化学及CAPRICORN项目探测南大洋变化”。本次航次于2018年1月11日至2月22日开展，从塔斯马尼亚州霍巴特出发并最终返回霍巴特。

本次航次仅RDI Ocean Surveyor 75kHz ADCP处于运行状态；RDI Ocean Surveyor 150kHz ADCP因硬件故障未启用，因此全部数据均由仅工作于窄带模式的RDI Ocean Surveyor 75kHz ADCP采集。

航次前四天，统一高密度ADCP系统（UHDAS）接收的Seapath导航数据馈送质量下降。经查，Seapath D-GPS当时工作于GNSS模式而非DGNSS模式。通过对UHDAS进行重新配置以优化航次前半段的航向校准，上述问题得以解决，同时生成了航次后续第二分段数据。

由于本次航次核心目标为采集海流数据，且过往航次中外部触发模式存在不稳定问题，因此本次采用内部触发模式。

在2018年1月11日21:00:20Z至2018年2月21日20:55:30Z的大部分航次时段内，左舷下放龙骨与水下吊舱齐平，安装深度为2米。

本数据集已完成处理，并归档于位于霍巴特的澳大利亚联邦科学与工业研究组织（Commonwealth Scientific and Industrial Research Organisation, CSIRO）海洋与大气（Oceans and Atmosphere, O&A）信息与数据中心（IDC）。