Oceanographic station data from bottle casts from the SPENCER from Ocean Weather Station C (OWS-C) in the North Atlantic Ocean 01 August 1968 to 23 August 1968 (NODC Accession 6800277)

Oceanographic station data were collected from the SPENCER within a 1-mile radius of Ocean Weather Station C (5245N 03530W) and in transit. Data were collected by the United States Coast Guard (USCG) from 01 August 1968 to 23 August 1968. Data were processed by NODC to the NODC standard Station Data II Output Format (SD2). Full format description is available from NODC at www.nodc.noaa.gov/General/NODC-Archive/sd2.html.

The SD2 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.

本数据集为海洋站观测数据，采集自“SPENCER”号科考船，作业范围覆盖海洋气象站C（Ocean Weather Station C，坐标52°45′N，035°30′W）周边1英里海域及航行途中。观测数据由美国海岸警卫队（United States Coast Guard, USCG）于1968年8月1日至1968年8月23日期间采集完成，后由美国国家海洋数据中心（National Oceanographic Data Center, NODC）处理为NODC标准站数据II输出格式（Station Data II Output Format, SD2）。完整格式说明可通过NODC官方网站www.nodc.noaa.gov/General/NODC-Archive/sd2.html获取。

SD2格式存储离散深度层级下记录的物理-化学海洋学观测数据。绝大多数观测采用多瓶式南森采水剖面（multi-bottle Nansen casts）或其他类型水样采集器完成；仅约5%的观测数据通过电子温盐深仪（conductivity-temperature-depth, CTD）或盐温深仪（salinity-temperature-depth, STD）记录仪获取。需说明的是，CTD/STD数据以与南森采水剖面一致的深度层级提交至NODC，其处理与存储流程与南森采水数据完全一致。每个观测站均附带航次相关信息（如科考船、所属国家、所属机构）、观测位置、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值等指标。观测剖面采集时刻的气象条件（如气温、气压、风速、海浪状况）也可被收录，此外还可附带水色（福勒-乌勒色标，Forel-Ule scale）、水透明度（塞氏盘深度，Secchi disk depth）及海底深度等辅助数据。研究人员可通过实测参数计算得到海水密度（σ_t，即sigma-t）、声速及动力深度距平值。每个观测站既包含实测深度层级下的原始观测数据，也包含通过插值得到的标准深度层级对应数据集。