Oceanographic station data from CTD casts from the GALLATIN from Ocean Weather Station B (OWS-B) in the North Atlantic Ocean from 31 January 1974 to 05 February 1974 (NODC Accession 7400495)

Oceanographic station data were collected from the GALLATIN within a 1-mile radius of Ocean Weather Station B (5630N 5100W) and in transit. Data were collected by the United States Coast Guard (USCG) from 31 January 1974 to 05 February 1974. 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加拉丁号（GALLATIN），覆盖范围为海洋气象站B（56°30′N，51°00′W）周边1英里海域及航行途中。数据由美国海岸警卫队（United States Coast Guard, USCG）于1974年1月31日至1974年2月5日采集完成，后经国家海洋数据中心（National Oceanographic Data Center, NODC）整理，转换为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获取。

SD2格式包含离散深度层记录的物理化学海洋学数据。多数观测采用多瓶南森采水器（multi-bottle Nansen casts）或其他类型水样采集器完成，约5%的少量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数据提交至NODC时的深度层级与南森采水数据保持一致，因此其处理与存储流程与南森采水数据完全相同。

每个海洋站均记录有航次信息（如船舶、所属国家/机构）、站位坐标、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。观测时的气象条件（如气温、气压、风向风速、海浪情况）亦可被记录，此外还可包含辅助观测数据，例如水色（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。

数据集可通过实测参数计算得到密度（σ-t，sigma-t）、声速及动态深度异常值。每个海洋站既包含实测深度层的原始观测数据，同时也包含经插值得到的标准深度层数据集。