Conductivity, Temperature, Pressure (CTD) measurements from Sea Bird Electronics SBE37 instruments taken in the Eurasian Basin, Arctic Ocean, 2018-2021.

The long-term mooring M1-4c was deployed in the Eurasian Basin of the Arctic Ocean at 78o28.084N (North) and 125o57.679E (East), 2700 meter (m) during the Nansen and Amundsen Basin Observational System (NABOS) 2018 cruise. It was successfully recovered on September 19, 2021. The primary goal of mooring Conductivity, Temperature, Pressure (CTD) observations was to understand the role of stratification in controlling transports of the Atlantic Water heat and other properties to the upper ocean and ice. Primary objectives included quantifying the structure and temporal variability of the main water masses and obtaining detailed information about upper ocean, halocline, and Atlantic water (AW) layer dynamics and seasonal variations. This data set contains separate text files with outputs of each Sea Bird Electronics (SBE)-37 instrument at M1-4c mooring. SBE-37 data file includes a one-row header with titles for all data columns. Processing SBE-37 records utilized standard data processing packages provided by vendors. Some records provided by SBE-37 instruments required corrections of salinity in order to remove vertical instabilities. Each data row includes observations of temperature in-situ, conductivity, pressure, salinity, and date/time stamp, which contains day, month, year, hour, minutes, and seconds of measurements. All SBE-37 instruments used Greenwich Mean Time (GMT) for this time stamp.本数据集对应部署于北冰洋欧亚海盆（Eurasian Basin）的长期锚系观测系统M1-4c，其布设坐标为北纬78°28.084′、东经125°57.679′，布放水深2700米，搭载于2018年南森-阿蒙森海盆观测系统（Nansen and Amundsen Basin Observational System, NABOS）科考航次。该锚系系统于2021年9月19日成功回收。 本次锚系温盐深（Conductivity, Temperature, Pressure, CTD）观测的核心目标，是阐明层化作用在调控大西洋水（Atlantic Water, AW）热量及其他属性向上层海洋与海冰输运过程中的作用。主要研究目标包括量化主要水团的结构与时间变异性，获取上层海洋、盐跃层及大西洋水层的动力学特征与季节变化的精细信息。 本数据集包含多个独立文本文件，分别对应锚系M1-4c搭载的每一台海鸟电子（Sea Bird Electronics, SBE）-37型观测仪器的输出数据。每份SBE-37数据文件均包含一行表头，用于标注所有数据列的名称。SBE-37观测记录的处理采用厂商提供的标准数据处理软件包完成。部分SBE-37仪器获取的观测记录需进行盐度校正，以消除垂向不稳定性。 每条数据行包含现场温度、电导率、压力、盐度的观测值以及测量日期/时间戳，时间戳包含测量的日、月、年、时、分、秒信息。本次观测所有SBE-37仪器均采用格林尼治标准时间（Greenwich Mean Time, GMT）作为时间基准。