Physical and chemical oceanographic data during Umitaka-maru cruise of the 60th Japanese Antarctic Research Expedition in January 2019

The Southern Ocean connects all major ocean basins and plays a pivotal role in the meridional overturning circulation of the global oceans. High-quality physical (temperature, salinity, and dissolved oxygen) and chemical (nutrients) oceanographic data from the Southern Ocean are thus critical for an improved understanding of future climates. As part of the 60th Japanese Antarctic Research Expedition, and also as a part of annually conducted monitoring observations, we have obtained high-quality Conductivity-Temperature-Depth (CTD) and water sampling data (salinity, dissolved oxygen, and nutrients) at 6 sites located along a 110E transect in January 2019. Sea surface temperature and salinity were obtained continuously with a thermosalinograph (TSG) along the cruise track between the ports of Fremantle and Hobart, except within the Australian Exclusive Economic Zone. Data quality was validated by following as far as possible the recommendations for instruments and methods of the Global Ocean Ship-Based Hydrographic Investigation Program.南大洋连接全球所有主要大洋盆地，在全球海洋经向翻转环流中发挥着关键作用。因此，获取南大洋高质量的物理海洋学（温度、盐度与溶解氧）及化学海洋学（营养盐）数据，对于深化对未来气候的认知至关重要。作为第60次日本南极考察队的一部分，同时也是年度监测观测计划的组成部分，我们于2019年1月沿110°E断面的6个站位获取了高质量的温盐深仪（Conductivity-Temperature-Depth, CTD）测量数据及水样采集数据（盐度、溶解氧与营养盐）。我们使用温盐计（thermosalinograph, TSG）沿弗里曼特尔港至霍巴特港的航行轨迹连续获取海表温度与盐度数据，但澳大利亚专属经济区范围内除外。本研究通过尽可能遵循全球海洋船舶水文调查计划（Global Ocean Ship-Based Hydrographic Investigation Program）中关于仪器使用与观测方法的相关建议，完成了数据质量验证。