Oceanographic station data from bottle casts from the MINNETONKA from Ocean Weather Station N (OWS-N) in the North Pacific Ocean from 05 December 1971 to 31 December 1971 (NODC Accession 7200902)

Oceanographic station data were collected from the MINNETONKA within a 1-mile radius of Ocean Weather Station N (3000N 14000W) and in transit. Data were collected by the United States Coast Guard (USCG) from 05 December 1971 to 31 December 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“明尼通卡”号科考船，采集范围覆盖N号海洋气象站（30°00′N，140°00′W）周边1英里海域及航行途中。数据采集工作由美国海岸警卫队（United States Coast Guard, USCG）于1971年12月5日至1971年12月31日期间完成。数据由美国国家海洋数据中心（National Oceanographic Data Center, NODC）整理为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www.nodc.noaa.gov/General/NODC-Archive/sd2.html获取。

SD2格式存储了离散深度层级下的物理海洋与化学海洋学数据。绝大多数观测数据通过多瓶式南森采水器（multi-bottle Nansen casts）或其他类型的水样采集装置获取，约5%的少量数据则通过电子电导率-温度-深度仪（conductivity-temperature-depth, CTD）或盐度-温度-深度仪（salinity-temperature-depth, STD）记录仪采集。不过，CTD/STD数据按照与南森采水数据一致的深度层级上报至NODC，其处理与存储流程与南森采水数据完全一致。每个海洋站均附带航行信息（如船舶、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，同时可能包含溶解氧、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）也可能被记录，同时附带的辅助数据包括水色（弗洛尔-乌勒色标，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）、声速及动力深度距平值可通过实测参数计算得到。每个海洋站既包含实测深度层级下的观测数据，同时也包含经插值得到的标准深度层级数据集。