Oceanographic station data from CTD casts from the BOUTWELL from Ocean Weather Station E (OWS-E) in the North Atlantic Ocean 31 May 1970 to 29 June 1970 (NODC Accession 7001361)

Oceanographic station data were collected from the BOUTWELL within a 1-mile radius of Ocean Weather Station E (3500N 04800W) and in transit. Data were collected by the United States Coast Guard (USCG) from 31 May 1970 to 29 June 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BOUTWELL号舰艇，采集范围覆盖海洋气象站E（北纬35°00′、西经48°00′）周边1海里海域及航行途中。数据由美国海岸警卫队（United States Coast Guard, USCG）于1970年5月31日至1970年6月29日期间采集。国家海洋数据中心（National Oceanographic Data Center, NODC）已将所有数据处理为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官方网址https://www.nodc.noaa.gov/General/NODC-Archive/sd2.html查阅。

SD2格式存储了离散深度层级下记录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）或其他类型的水样采集器完成，仅约5%的观测数据通过电子电导率-温度-深度（conductivity-temperature-depth, CTD）仪或盐度-温度-深度（salinity-temperature-depth, STD）记录仪获取。需说明的是，CTD/STD仪上报至NODC时所采用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。每个海洋站均附带航行信息（如舰艇、所属国家、所属机构）、站位坐标、观测日期与时间。核心观测参数为温度与盐度，同时亦可上报溶解氧、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，此外还可附带辅助数据，如水色（福勒-尤勒色标，Forel-Ule scale）、水体透明度（塞氏盘深度，Secchi disk depth）及海底深度。密度（sigma-t）、声速及动态深度异常值可通过实测参数计算得到。每个海洋站数据集既包含实测深度层级下的原始观测值，也包含经插值得到的标准深度层级数据。