Oceanographic station, meteorological, and other data from CTD casts from the ALBATROSS IV as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project from 19 March 1973 to 29 March 1973 (NODC Accession 7300914)

Oceanographic station, meteorological, and other data were collected from CTD casts from the ALBATROSS IV from 19 March 1973 to 29 March 1973. Data were collected by the National Marine Fisheries Service (NMFS) as part of the Marine Resources Monitoring, Assessment and Prediction (MARMAP) project. Data were processed by NODC to the NODC standard Oceanographic Station Data (SD2) format. Full format description is available from NODC at www.nodc.noaa.gov/General/NODC-Archive/sd2.html. The Oceanographic Station Data format contains physical-chemical oceanographic data recorded at discrete depth levels. Most of the observations were made using multi-bottle Nansen casts or other types of water samplers. A small amount (about 5 percent) were obtained using electronic CTD (conductivity-temperature-depth) or STD (salinity-temperature-depth) recorders. The CTD/STD data were reported to NODC at depth levels equivalent to Nansen cast data, however, and have been processed and stored the same as the Nansen data. Cruise information (e.g., ship, country, institution), position, date, and time, and reported for each station. The principal measured parameters and temperature and salinity, but dissolved oxygen, phosphate, total phosphorus, silicate, nitrate, nitrite, and pH may be reported. Meteorological conditions at the time of the cast (e.g., air temperature and pressure, wind, waves) may also be reported, as well as auxiliary data such as water color (Forel-Ule scale), water transparency (Secchi disk depth), and depth to bottom. Values of density (sigma-t), sound velocity, and dynamic depth anomaly are computed from measured parameters. Each station contains the measurements taken at the observed depth levels, but also includes data values interpolated to a set of standard depth levels.1973年3月19日至3月29日，研究团队依托“信天翁四号”（ALBATROSS IV）科考船开展温盐深仪（conductivity-temperature-depth, CTD）剖面测量作业，采集得到海洋站观测、气象观测及其他相关数据。该批数据由美国国家海洋渔业局（National Marine Fisheries Service, NMFS）作为海洋资源监测、评估与预测（Marine Resources Monitoring, Assessment and Prediction, MARMAP）项目的组成部分采集完成，后续由美国国家海洋数据中心（National Oceanographic Data Center, NODC）按照NODC标准海洋站数据格式（SD2）完成数据处理工作。完整的格式说明文档可通过NODC官网www.nodc.noaa.gov/General/NODC-Archive/sd2.html查阅。 SD2格式的海洋站数据涵盖离散深度层级下记录的物理海洋与化学海洋学观测数据。绝大多数观测采用多瓶式南森采水器或其他类型水体采样装置完成，仅约5%的观测数据通过电子温盐深仪（CTD）或盐温深记录仪（salinity-temperature-depth, STD）获取。不过，所有提交至NODC的CTD/STD数据均被统一换算至与南森采水剖面一致的深度层级，并按照与南森采样数据完全相同的流程开展处理与存储。每个观测站均附带航行相关信息（如科考船所属国家、依托机构）、站位坐标、观测日期与时间。核心观测参数为温度与盐度，同时可记录溶解氧、磷酸盐、总磷、硅酸盐、硝酸盐、亚硝酸盐及pH值等多项指标。观测作业时的气象条件（如气温、气压、风速、浪况）同样可被记录，此外还可附带水体颜色（弗洛尔-乌勒色度标度）、水体透明度（塞氏盘深度）及海底深度等辅助观测数据。研究人员可通过实测参数计算得到密度（σ-t）、声速及动态深度异常值。每个观测站既包含实测深度层级下的原始观测数据，也包含经插值得到的标准深度层级数据集。