Physical oceanographic data during Antarctic research cruise by Hakuho-Maru in 2016 (KH-16)

The main target of physical oceanography section during this R/V Hakuho-Maru cruise is to describe the water properties of the Cape Darnley Bottom Water (CDBW) - its origin, distribution, and long-term change. The target area is the region spanning from a deep part in the Weddell-Enderby Basin to shallower continental shelf region off Cape Darnley, East Antarctica. Conductivity Temperature Depth (CTD)/ Rosette Multi-Sampler (RMS) observations were conducted for 17 stations in February 2016. Seabird SBE911plus CTD system/SBE32 RMS was used. Water samples for salinity were collected to calibrate the CTD sensors. Bottle salinity analysis was done by Autosal8400B (Guildline) at Laboratory No.5. Measurements were done for 122 standard/samples on 17-18 February after all CTD casts completed. Room temperature were controlled within 22.5-23.1 degC range. Bottle salinity shows a generally good determination. Some outlier values are found for near-surface waters. It seems to have a slight pressure dependency. Compared to the large signal, no clear temporal/inter-station drift was found. Hence the pressure-dependent offset was corrected for CTD output.本"白鳳丸"号科考调查船航次的物理海洋学分队核心任务为系统刻画达恩利角底层水（Cape Darnley Bottom Water, CDBW）的水体属性——包括其起源、分布特征与长期变化规律。调查区域涵盖从威德尔-恩德比海盆深水区至东南极达恩利角外海较浅的大陆架区域。2016年2月，团队在17个站位开展了温盐深剖面仪（Conductivity Temperature Depth, CTD）/罗塞特多通道采水器（Rosette Multi-Sampler, RMS）观测作业，所用设备为Seabird公司SBE911plus型温盐深系统与SBE32型采水器。 为校准CTD传感器，同步采集了盐度分析用水样。所有瓶采盐度分析均于5号实验室通过Guildline公司Autosal8400B型盐度计完成。在全部CTD布放作业结束后的2月17至18日，共完成122个标准水样的测定。实验室室温控制在22.5~23.1摄氏度范围内。瓶采盐度的测定结果整体精度良好，但近表层水体存在少量异常值，且似乎存在微弱的压力相关性。相较于整体信号幅度，未观测到明显的时间偏移或站位间漂移，因此针对CTD输出数据校正了该压力相关偏移量。