Physical oceanography (CTD) during METEOR cruise M189

94 CTD profiles from the Northern Benguela and Tropical Angolan Upwelling region collected using Seabird 911plus system equipped with dual temperature-conductivity-oxygen sensors. The system had a 24-bottle water sampling rosette with 10 l Niskin bottles. Water sampling, processing, and calibration followed GO-SHIP recommendations (Swift, 2010; McTaggart et al., 2010; Uchida et al., 2010) and included the recommended steps Data Conversion, Sensor Time-Alignment, Creation of Bottle Files, Outlier Removal, Pressure Sensor Filtering, Conductivity Cell Thermal Mass Correction, Ship Roll Correction and Deck Offset Correction by Loop Editing, as well as Derivation of Calculated Properties. After these steps, conductivity and oxygen readings were calibrated against values determined with salinometry and Winkler titration , respectively. Finally, the downcast data was averaged over 1 dbar wide intervals. An independent upcast calibration was used to obtain calibrated CTDO values coincident with the discrete water samples.

本数据集包含94个采自北本格拉与热带安哥拉上升流区的温盐深（CTD）剖面数据，采集所用设备为搭载双温度-电导率-溶解氧传感器的Seabird 911plus系统。该系统配备了搭载10升尼斯金（Niskin）采水瓶的24瓶式采水笼架。
采水作业、数据处理与校准流程均遵循全球海洋断面调查计划（GO-SHIP）的推荐规范（Swift, 2010; McTaggart et al., 2010; Uchida et al., 2010），涵盖的标准步骤包括：数据转换、传感器时间对齐、采水瓶文件生成、异常值剔除、压力传感器滤波、电导池热质量校正、船体横摇校正以及通过循环编辑完成的甲板偏移校正，同时包含计算属性推导环节。
完成上述处理流程后，分别采用盐度计法与温克勒滴定法得到的标准值，对电导率与溶解氧的观测数据进行校准。
最后，将下行剖面数据以1分巴（dbar，压力单位，1 dbar约对应1米水深）为间隔进行平均。此外，本研究采用独立的上行剖面校准流程，以获取与离散采水样本匹配的校准后温盐深溶解氧（CTDO）数据。