Oceanographic station data from CTD casts from the CHASE from Ocean Weather Station C (OWS-C) in the North Atlantic Ocean 23 November 1970 to 10 December 1970 (NODC Accession 7100760)

Oceanographic station data were collected from the CHASE 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 23 November 1970 to 10 December 1970. 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.

本数据集的海洋站数据采集自CHASE项目，覆盖海洋气象站C（52°45′N，035°30′W）周边1英里海域及航行途中。本次数据由美国海岸警卫队（United States Coast Guard, USCG）于1970年11月23日至1970年12月10日期间采集。所有数据已由国家海洋数据中心（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官网www.nodc.noaa.gov/General/NODC-Archive/sd2.html查阅。

SD2格式存储了离散深度层级下的物理化学海洋学数据。绝大多数观测采用多瓶南森采水器（multi-bottle Nansen casts）或其他类型的水体采样器完成，剩余约5%的观测数据则通过电子CTD（conductivity-temperature-depth, CTD，电导率-温度-深度）或STD（salinity-temperature-depth, STD，盐度-温度-深度）记录仪获取。不过，提交至NODC的CTD/STD数据已统一匹配至与南森采水数据一致的深度层级，并与南森采水数据采用相同流程进行处理与存储。每个海洋站均附带航行相关信息，包括船舶、所属国家及机构、经纬度位置、观测日期与时间。核心观测参数以温度与盐度为主，同时亦可记录溶解氧、磷酸盐、总磷、硅酸盐、硝酸盐、亚硝酸盐及pH值等指标。采水作业时的气象条件（如气温、气压、风向风速、海浪状况）亦可被记录，同时还包含水体颜色（福勒-于勒色标，Forel-Ule scale）、水体透明度（塞氏盘深度，Secchi disk depth）及海底深度等辅助数据。密度（sigma-t）、声速及动态深度异常等指标则由实测参数计算得出。每个海洋站数据集既包含实测深度层级下的观测值，同时也包含经插值得到的标准深度层级数据。