Oceanographic station data from bottle and CTD casts from the SEBAGO from Ocean Weather Station D (OWS-D) in the North Atlantic Ocean 18 January 1971 to 07 February 1971 (NODC Accession 7100927)

Oceanographic station data were collected from the SEBAGO within a 1-mile radius of Ocean Weather Station D (4400N 04100W) and in transit. Data were collected by the United States Coast Guard (USCG) from 18 January 1971 to 07 February 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.本数据集为海洋站观测数据，采集自“SEBAGO”号船舶，观测区域覆盖海洋气象站D（44°00'N 041°00'W）周边1英里范围及航行途中。数据由美国海岸警卫队（United States Coast Guard, USCG）于1971年1月18日至1971年2月7日期间采集，后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（SD2）。完整格式说明可从NODC官网www.nodc.noaa.gov/General/NODC-Archive/sd2.html获取。 SD2格式存储离散深度层级下采集的物理化学海洋学观测数据。绝大多数观测采用多瓶式Nansen采水器（multi-bottle Nansen casts）或其他类型水样采集装置完成，仅约5%的观测数据来自电子电导率-温度-深度记录仪（conductivity-temperature-depth, CTD）或盐度-温度-深度记录仪（salinity-temperature-depth, STD）。不过，CTD/STD数据均按照与Nansen采水器观测数据一致的深度层级提交至NODC，且处理与存储方式与Nansen采水器数据完全相同。每个海洋站均记录航次信息（如船舶、所属国家、研究机构）、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。观测时的气象条件（如气温、气压、风向风速、海浪状况）也可一并记录，此外还可包含辅助观测数据，如水体颜色（福勒-于勒色标，Forel-Ule scale）、水体透明度（塞氏盘深度，Secchi disk depth）及海底水深。研究人员可通过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下的观测数据，也包含经插值得到的标准深度层级对应数据值。