Oceanographic station data from bottle casts from the DALLAS from Ocean Weather Station E (OWS-E) in the North Atlantic Ocean from 22 April 1971 to 14 May 1971 (NODC Accession 7200325)

Oceanographic station data were collected from the DALLAS within a 1-mile radius of Ocean Weather Station E (3500N 0480W) and in transit. Data were collected by the United States Coast Guard (USCG) from 22 April 1971 to 14 May 1971. 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执行任务途中的达拉斯号（DALLAS）科考船，覆盖范围为海洋气象站E（35°00′N，048°00′W）周边1英里海域及船舶航行途经区域。该数据由美国海岸警卫队（United States Coast Guard, USCG）于1971年4月22日至1971年5月14日期间采集。美国国家海洋数据中心（National Oceanographic Data Center, NODC）已将原始数据处理为NODC标准站数据II输出格式（Station Data II Output Format, SD2）。完整的格式说明可通过NODC官网的https://www.nodc.noaa.gov/General/NODC-Archive/sd2.html页面获取。

SD2格式存储了在离散深度层级采集的物理化学海洋学数据。绝大多数观测采用多瓶式南森采水器（multi-bottle Nansen casts）或其他类型的水体采样器完成，仅约5%的观测数据通过电子导电率-温度-深度（conductivity-temperature-depth, CTD）记录仪或盐度-温度-深度（salinity-temperature-depth, STD）记录仪获取。不过，CTD/STD数据是以与南森采水器数据一致的深度层级上报至NODC的，因此其处理与存储流程与南森采水器数据完全一致。每个海洋站均附带航次信息（如船舶、所属国家、所属机构）、观测位置、日期及时间等元数据。观测的核心参数为温度与盐度，同时也可记录溶解氧、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、风速、浪况）也可被记录，同时还包含辅助观测数据，例如水体颜色（福尔-尤勒（Forel-Ule）色标）、水体透明度（塞氏盘（Secchi disk）深度）以及海底深度。可基于实测参数计算得到密度（sigma-t）、声速及动态深度异常值。每个海洋站数据集既包含实测深度层级的原始观测数据，也包含经插值得到的标准深度层级数据。